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PeAnalyzer.py
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PeAnalyzer.py
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import lief
import xml.etree.ElementTree as ET
import argparse
import hashlib
import prettytable
import time
import datetime
import constants
import re
import string
import os
class Import:
def __init__(self, lib, fct):
self.lib = lib
self.fct = fct
self.blacklisted = False
self.group = None
def __str__(self):
return self.lib + ": " + self.fct + ", blacklisted: " + str(self.blacklisted) + " with group: " + str(self.group)
class Resource:
def __init__(self, type, name, language, md5, content):
self.type = type
self.name = name
self.language = language
self.md5 = md5
self.content = content
def __str__(self):
return str(self.name) + " of type " + str(self.type) + ", language " + str(self.language) + " has md5 " + str(self.md5)
class PeAnalyzer:
imports = None
resources = None
def __init__(self, file):
self.file = file
if lief.is_pe(file):
self.peFile = lief.parse(file)
else:
self.peFile = None
self.strings = None
def printIndicators(self, indicators, score, maxScore, table, all = False, jsonDict = None, root = None):
jsonResults = []
if not root is None:
indicatorsXml = ET.SubElement(root, "indicators")
indicatorsXml = root.find("indicators")
# check file name
if self.peFile.name != self.file.split("/")[-1]: # TODO: Check if that's correct
print("\tName: " + self.peFile.name + " differs from file name " + self.file.split("/")[-1])
# Suspicious sizes: File, Optional header, file header, certificate
# TODO: Read severity from indicators.xml?
thresholdRoot = ET.parse("xml/thresholds.xml").getroot()
mins = thresholdRoot.find('thresholds').find('minimums')
maxs = thresholdRoot.find('thresholds').find('maximums')
min = int(mins.find('Image').text)
max = int(maxs.find('Image').text)
maxScore += int(indicators['1207'].severity)
if not (min <= self.peFile.optional_header.sizeof_image <= max):
score += int(indicators['1207'].severity)
str = "The value of 'SizeOfImage' (%d) is suspicious" % (self.peFile.optional_header.sizeof_image)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1207'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1207'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1207'].severity])
elif all:
print(constants.GREEN + "\tSize of image is reasonable (%d bytes)" % self.peFile.optional_header.sizeof_image + constants.RESET)
#min = int(mins.find('file-header').text)
#max = int(maxs.find('file-header').text)
#if min <= self.peFile.dos_header.header_size_in_paragraphs <= max: # TODO: This seems to be incorrect
# print(constants.GREEN + "\tSize of File Header is reasonable (%d bytes)" % self.peFile.sizeof_headers + constants.RESET)
#else:
# print(constants.RED + "\tSize %d bytes of File Header is outide reasonable range (%d - %d bytes)" % (self.peFile.sizeof_headers, min, max) + constants.RESET)
min = int(mins.find('optional-header').text)
max = int(maxs.find('optional-header').text)
maxScore += int(indicators['1004'].severity)
if not (min <= self.peFile.header.sizeof_optional_header <= max): # Not sure if that's correct
score += int(indicators['1004'].severity)
str = "The size (%d bytes) of the optional-header is suspicious" % (self.peFile.header.sizeof_optional_header)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1004'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1004'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1004'].severity])
elif all:
print(constants.GREEN + "\tSize of Optional Header is reasonable (%d bytes)" % self.peFile.header.sizeof_optional_header + constants.RESET)
# Content of certificate??, expired issuer, expired subject, no digital certificate
if not self.peFile.has_signature and jsonDict is None and root is None:
print(constants.RED + "\tThe PE file has no digital signature" + constants.RESET)
elif self.peFile.has_signature:
maxScore += int(indicators['1039'].severity)
for cert in self.peFile.signature.certificates:
cert_from = datetime.datetime.fromtimestamp(cert.valid_from)
cert_to = datetime.datetime.fromtimestamp(cert.valid_to)
if cert_from > datetime.datetime.now() or cert_to < datetime.datetime.now():
score += int(indicators['1039'].severity)
str = "Digital certificate is used which is not valid (from: %s to: %s)" + (str(cert_from), str(cert_to))
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1039'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1039'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1039'].severity])
# TODO: We should check if the signature is valid but this seems to be ugly
# Self-extractable file??
# Managed by .NET??
# References debug symbols
# Code-less file
min = int(mins.find('Code').text)
maxScore += int(indicators['1027'].severity)
if min > self.peFile.optional_header.sizeof_code:
score += int(indicators['1027'].severity)
str = "The file is code-less"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1027'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1027'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1027'].severity])
elif all:
print(constants.GREEN + "\tThe file has valid code size" + constants.RESET)
# No manifest
maxScore += int(indicators['1043'].severity)
if self.peFile.has_resources and not self.peFile.resources_manager.has_manifest:
score += int(indicators['1043'].severity)
str = "The file has no Manifest"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1043'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1043'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1043'].severity])
elif all:
print(constants.GREEN + "\tThe file has a Manifest" + constants.RESET)
# Entrypoint things
lastSection = False
maxScore += int(indicators['1035'].severity)
not_exe_entry_point = 0
for section in self.peFile.sections:
lastSection = False
start = self.peFile.optional_header.imagebase + section.virtual_address
if start < self.peFile.entrypoint < start + section.size:
# Entrypoint is in this section
lastSection = True
if not section.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_EXECUTE):
# Section is not marked as executable
score += int(indicators['1035'].severity)
str = "Entrypoint (%s) in section %s which is not executable" % (hex(self.peFile.entrypoint), section.name)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1035'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1035'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1035'].severity])
not_exe_entry_point += 1
if all and not_exe_entry_point == 0:
print(constants.GREEN + "\tNo non-executable entrypoint found" + constants.RESET)
maxScore += int(indicators['1605'].severity)
if lastSection:
# The section of the entry point was the last section in the PE file
score += int(indicators['1605'].severity)
str = "Entrypoint is in last section"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1605'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1605'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1605'].severity])
maxScore += int(indicators['1037'].severity)
if self.peFile.optional_header.imagebase > self.peFile.entrypoint > self.peFile.optional_header.imagebase + self.peFile.optional_header.sizeof_image:
# Entry point outside file
score += int(indicators['1037'].severity)
str = "Entrypoint (%s) is outside the file." % (hex(self.peFile.entrypoint))
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1037'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1037'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1037'].severity])
elif all:
print(constants.GREEN + "\tEntrypoint (%s) located inside the file." % (hex(self.peFile.entrypoint)) + constants.RESET)
maxScore += int(indicators['1211'].severity)
if self.peFile.entrypoint == 0:
score += int(indicators['1211'].severity)
str = "The address of the entry-point is zero"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1211'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1211'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1211'].severity])
elif all:
print(constants.GREEN + "\tThe address of the entry-point is not zero" + constants.RESET)
# TODO: Invalid file checksum, checksum computed different to checksum
# File ratio of resources
maxScore += int(indicators['1232'].severity)
if self.peFile.has_resources:
rsrc_directory = self.peFile.data_directory(lief.PE.DATA_DIRECTORY.RESOURCE_TABLE)
if rsrc_directory.has_section:
min = int(mins.find('ProcentResource').text)
max = int(maxs.find('ProcentResource').text)
maxScore += int(indicators['1220'].severity)
percentage = (rsrc_directory.section.size / self.peFile.optional_header.sizeof_image ) * 100
if not (min <= percentage <= max):
score += int(indicators['1220'].severity)
str = "The file-ratio (%d) of the resources is suspicious" % (percentage)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1220'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1220'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1220'].severity])
elif all:
print(constants.GREEN + "\tThe file-ratio (%d) of the resources seems reasonable" % (percentage) + constants.RESET)
else:
score += int(indicators['1232'].severity)
str = "The file is resource-less"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1232'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1232'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1232'].severity])
# PE file uses control flow guard
maxScore += int(indicators['1050'].severity)
if self.peFile.optional_header.has(lief.PE.DLL_CHARACTERISTICS.GUARD_CF):
score += int(indicators['1211'].severity)
str = "The file implements Control Flow Guard (CFG)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1050'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1050'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1050'].severity])
elif all:
print(constants.GREEN + "\tThe file does not implement Control Flow Guard (CFG)" + constants.RESET)
# PE file is a WDM device driver
maxScore += int(indicators['1056'].severity)
if self.peFile.optional_header.has(lief.PE.DLL_CHARACTERISTICS.WDM_DRIVER):
score += int(indicators['1056'].severity)
str = "The file is a Device Driver"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1056'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1056'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1056'].severity])
elif all:
print(constants.GREEN + "\tThe file is not a Device Driver" + constants.RESET)
# PE file makes use of DEP protection
maxScore += int(indicators['1100'].severity)
maxScore += int(indicators['1101'].severity)
if self.peFile.optional_header.has(lief.PE.DLL_CHARACTERISTICS.NX_COMPAT):
score += int(indicators['1100'].severity)
str = "The file opts for Data Execution Prevention (DEP)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1100'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1100'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1100'].severity])
else:
score += int(indicators['1101'].severity)
str = "The file ignores Data Execution Prevention (DEP)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1101'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1101'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1101'].severity])
# PE file makes use of ASLR
maxScore += int(indicators['1102'].severity)
maxScore += int(indicators['1103'].severity)
if self.peFile.optional_header.has(lief.PE.DLL_CHARACTERISTICS.DYNAMIC_BASE):
score += int(indicators['1102'].severity)
str = "The file opts for Address Space Layout Randomization (ASLR)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1102'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1102'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1102'].severity])
else:
score += int(indicators['1103'].severity)
str = "The file ignores Address Space Layout Randomization (ASLR)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1103'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1103'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1103'].severity])
# PE file does not use of structured error handling (SEH)
maxScore += int(indicators['1105'].severity)
if self.peFile.optional_header.has(lief.PE.DLL_CHARACTERISTICS.NO_SEH):
score += int(indicators['1105'].severity)
str = "The file ignores Structured Exception Handling (SEH)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1105'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1105'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1105'].severity])
# PE file does not use GS
maxScore += int(indicators['1106'].severity)
maxScore += int(indicators['1107'].severity)
if self.peFile.has_configuration:
if self.peFile.load_configuration.security_cookie == 0:
score += int(indicators['1107'].severity)
str = "The file ignores cookies on the stack (GS)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1107'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1107'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1107'].severity])
else:
score += int(indicators['1106'].severity)
str = "The file opts for cookies on the stack (GS)"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1106'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1106'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1106'].severity])
# PE file does not use code integrity
maxScore += int(indicators['1109'].severity)
if self.peFile.has_configuration:
if isinstance(self.peFile.load_configuration, lief.PE.LoadConfigurationV2) and self.peFile.load_configuration.code_integrity.catalog == 0xFFFF:
score += int(indicators['1109'].severity)
str = "The file ignores Code Integrity"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1109'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1109'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1109'].severity])
elif all:
print(constants.GREEN + "\tThe file opts for Code Integrity" + constants.RESET)
# Get the pdb debug file name
data_dir = self.peFile.data_directory(lief.PE.DATA_DIRECTORY.DEBUG)
maxScore += int(indicators['1152'].severity)
maxScore += int(indicators['1153'].severity)
if data_dir.size != 0:
dbg_file_name_lst = self.peFile.get_content_from_virtual_address(self.peFile.optional_header.imagebase + data_dir.rva, data_dir.size - 24)
dbg_file_name = "".join(chr(c) for c in dbg_file_name_lst)
score += int(indicators['1152'].severity)
str = "The file references a debug symbols file (path: %s)" % (dbg_file_name)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1152'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1152'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1152'].severity])
if dbg_file_name.split(".")[-1] != ".pdb":
score += int(indicators['1153'].severity)
str = "The debug file name extension %s is suspicous" % (dbg_file_name.split(".")[-1])
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1152'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1152'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1152'].severity])
# Suspicious debug timestamp
maxScore += int(indicators['1157'].severity)
if self.peFile.has_debug:
dbg_time = datetime.datetime.fromtimestamp(self.peFile.debug.timestamp)
if dbg_time > datetime.datetime.now(): # TODO: Check if there are more criteria
score += int(indicators['1157'].severity)
str = "The age (%s) of the debug file is suspicious" % (str(dbg_time))
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1157'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1157'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1157'].severity])
# Check entropy of the sections, number of shared sections
min = int(mins.find('Entropy').text)
max = int(maxs.find('Entropy').text)
sharedSect = 0
suspicious_entropies = 0
for sect in self.peFile.sections:
if (not min < sect.entropy < max) and jsonDict is None and root is None:
print(constants.RED + "\tThe entropy %d of section %s is suspicious" % (sect.entropy, sect.name) + constants.RESET)
suspicious_entropies += 1
if sect.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_SHARED):
sharedSect += 1
if all and suspicious_entropies == 0:
print(constants.GREEN + "\tAll sections entropies seem reasonable" + constants.RESET)
min = int(mins.find('SharedSections').text)
max = int(maxs.find('SharedSections').text)
maxScore += int(indicators['1213'].severity)
if not min <= sharedSect <= max:
score += int(indicators['1213'].severity)
str = "The shared section(s) (%d) reached the max (%d) threshold" % (sharedSect, max)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1213'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1213'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1213'].severity])
elif all:
print(constants.GREEN + "\tShared section(s) (%d) below the max (%d) threshold" % (sharedSect, max) + constants.RESET)
# Check if first section is writable or last section is executable
maxScore += int(indicators['1223'].severity)
if list(self.peFile.sections)[0].has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_WRITE):
score += int(indicators['1223'].severity)
str = "The first section (name:%s) is writable" % (self.peFile.sections[0].name)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1223'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1223'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1223'].severity])
elif all:
print(constants.GREEN + "\tThe first section (name:%s) is not writable" % (self.peFile.sections[0].name) + constants.RESET)
maxScore += int(indicators['1222'].severity)
if list(self.peFile.sections)[-1].has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_EXECUTE):
score += int(indicators['1222'].severity)
str = "The last section (name:%s) is executable" % (self.peFile.sections[-1].name)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1222'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1222'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1222'].severity])
elif all:
print(constants.GREEN + "\tThe last section (name:%s) is not executable" % (self.peFile.sections[-1].name) + constants.RESET)
# Size of initialized data
min = int(mins.find('InitializedData').text)
max = int(maxs.find('InitializedData').text)
maxScore += int(indicators['1208'].severity)
if not min < self.peFile.optional_header.sizeof_initialized_data < max:
score += int(indicators['1208'].severity)
str = "The size of initialized data reached the max (%d bytes) threshold" % self.peFile.optional_header.sizeof_initialized_data
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1208'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1208'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1208'].severity])
elif all:
print(constants.GREEN + "\tThe size of initialized data (%d bytes) is reasonable" % self.peFile.optional_header.sizeof_initialized_data + constants.RESET)
# TODO: File references missing library
# Check imphash
self.checkImphashes()
# More then one executable sections
exe_sections = 0
for section in self.peFile.sections:
if section.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_EXECUTE):
exe_sections += 1
maxScore += int(indicators['2246'].severity) # Same as 1246
if not int(mins.find('ExecutableSections').text) <= exe_sections <= int(maxs.find('ExecutableSections').text):
score += int(indicators['2246'].severity)
str = "The executable has %d executable sections" % exe_sections
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['2246'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['2246'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['2246'].severity])
elif all:
print(constants.GREEN + "\tThe executable has %d executable sections" % exe_sections + constants.RESET)
# executable and writable sections
maxScore += int(indicators['2215'].severity)
count_exe_write_sec = 0
for section in self.peFile.sections:
if section.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_EXECUTE) and section.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.MEM_WRITE):
count_exe_write_sec += 1
if count_exe_write_sec > 0:
score += int(indicators['2215'].severity)
str = "The executable has section(s) that are both executable and writable"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['2215'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['2215'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['2215'].severity])
elif all:
print(constants.GREEN + "\tThe executable has %d section(s) that is/are both executable and writable" % count_exe_write_sec + constants.RESET)
# common passwords
if self.strings is None:
self.searchAllStrings()
stringsXml = ET.parse("xml/strings.xml").getroot()
password_checks = 0
# TODO: Maybe use regex instead of checking if the string is in the list of strings?
for r in stringsXml.find('psw').findall('item'):
if r.text in self.strings:
password_checks += 1
maxScore += int(indicators['1637'].severity)
if not (int(mins.find('Passwords').text) <= password_checks <= int(maxs.find('Passwords').text)):
score += int(indicators['1637'].severity)
str = "The executable contains %d default passwords." % password_checks
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1637'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1637'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1637'].severity])
elif all:
print(constants.GREEN + "\tThe executable contains %d default passwords." % password_checks + constants.RESET)
# Compiled with Delphi
maxScore += int(indicators['1121'].severity)
if "Delphi" in self.strings:
score += int(indicators['1121'].severity)
str = "The file has been compiled with Delphi"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1121'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1121'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1121'].severity])
elif all:
print(constants.GREEN + "\t The file has not been compiled with Delphi" + constants.RESET)
# Size of code greater than size of code section
code_sec_size = 0
for section in self.peFile.sections:
if section.has_characteristic(lief.PE.SECTION_CHARACTERISTICS.CNT_CODE):
code_sec_size += section.size
maxScore += int(indicators['1623'].severity)
if self.peFile.optional_header.sizeof_code > code_sec_size:
score += int(indicators['1623'].severity)
str = "The size of code (%i bytes) is bigger than the size (%i bytes) of code sections" % (self.peFile.optional_header.sizeof_code, code_sec_size)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1623'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1623'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1623'].severity])
elif all:
print(constants.GREEN + "\tThe size of code (%i bytes) matches the size of code sections" % self.peFile.optional_header.sizeof_code)
# Suspicious section names
standardSectionNames = [".text", ".bss", ".rdata", ".data", ".idata", ".reloc", ".rsrc"]
suspiciousSections = 0
for section in self.peFile.sections:
if not section.name in standardSectionNames and jsonDict is None and root is None:
print(constants.RED + "\tSuspicious section name %s" % (section.name) + constants.RESET)
suspiciousSections += 1
min = int(mins.find('BlackListedSectionNames').text)
max = int(maxs.find('BlackListedSectionNames').text)
maxScore += int(indicators['2248'].severity)
if not min <= suspiciousSections < max:
score += int(indicators['2248'].severity)
str = "The file has (%i) blacklisted section name(s)" % suspiciousSections
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['2248'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['2248'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['2248'].severity])
# Missing DOS-Stub
maxScore += int(indicators['1260'].severity)
if len(self.peFile.dos_stub) == 0:
score += int(indicators['1260'].severity)
str = "The dos-stub is missing"
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1260'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1260'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1260'].severity])
elif all:
print(constants.GREEN + "\tThe dos-stub is present" + constants.RESET)
# Number of anti-debugging functions
min = int(mins.find('AntidebugFunctions').text)
max = int(maxs.find('AntidebugFunctions').text)
antiDbgFunctions = len(self.getAntiDebugFcts())
maxScore += int(indicators['2270'].severity) # Same as 1270
if not (min <= antiDbgFunctions <= max):
score += int(indicators['2270'].severity)
str = "The file imports (%d) antidebug function(s)" % antiDbgFunctions
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['2270'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['2270'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['2270'].severity])
elif all:
print(constants.GREEN + "\tThe file imports (%d) antidebug function(s), less than min threshold (%d)" % (antiDbgFunctions, min) + constants.RESET)
# Keyboard functions
keyboardFcts, keys = self.getKeyboardFcts()
maxScore += int(indicators['1635'].severity)
if len(keyboardFcts) > 0:
score += int(indicators['1635'].severity)
str = "The file references (%i) keyboard functions" % len(keyboardFcts)
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1635'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1635'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1635'].severity])
if keys > 0:
score += int(indicators['1635'].severity)
str = "The file references (%i) keyboard keys like a Keylogger" % keys
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity" : indicators['1635'].severity})
elif not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "indicator")
indicatorXml.set("severity", indicators['1635'].severity)
indicatorXml.text = str
else:
table.add_row([constants.RED + str + constants.RESET, indicators['1635'].severity])
if all and not (len(keyboardFcts) > 0 or keys > 0):
print(constants.GREEN + "\tThe file does not references keyboard keys or functions" + constants.RESET)
if not jsonDict is None:
jsonDict["indicators"] = {}
jsonDict["indicators"]["indicators"] = jsonResults
return score, maxScore, jsonDict, root
def getKeyboardFcts(self):
if self.imports is None:
self.__getImports()
root = ET.parse("xml/functions.xml").getroot()
# Get all the blacklisted functions and libraries by name
keyboardFcts = []
for lib in root.find('libs').findall('lib'):
if lib.find('fcts') is None:
if 'group' in lib.attrib and lib.attrib['group'] == '22':
f = list(filter(lambda i: i.lib == lib.attrib['name'], self.imports))
keyboardFcts += f
continue
for fct in lib.find('fcts'):
if 'group' in fct.attrib and fct.attrib['group'] == '22':
f = list(filter(lambda i: i.lib == lib.attrib['name'] and i.fct == fct.text, self.imports))
keyboardFcts += f
if self.strings is None:
self.searchAllStrings()
keys = 0
stringsXml = ET.parse("xml/strings.xml").getroot()
for r in stringsXml.find('keys').findall('key'):
if r.text in self.strings:
keys += 1
return keyboardFcts, keys
def getAntiDebugFcts(self):
if self.imports is None:
self.__getImports()
root = ET.parse("xml/functions.xml").getroot()
# Get all the blacklisted functions and libraries by name
antiDbgFunctions = []
for lib in root.find('libs').findall('lib'):
if lib.find('fcts') is None:
if 'group' in lib.attrib and lib.attrib['group'] == '16':
f = list(filter(lambda i: i.lib == lib.attrib['name'], self.imports))
antiDbgFunctions += f
continue
for fct in lib.find('fcts'):
if 'group' in fct.attrib and fct.attrib['group'] == '16':
f = list(filter(lambda i: i.lib == lib.attrib['name'] and i.fct == fct.text, self.imports))
antiDbgFunctions += f
f = list(filter(lambda i: i.lib == 'kernel32.dll' and i.fct == 'IsDebuggerPresent', self.imports))
antiDbgFunctions += f
return antiDbgFunctions
def checkFeatures(self, indicators, score, maxScore, table = None, jsonDict = None, root = None):
if self.imports is None:
self.__getImports()
jsonResults = []
if not root is None:
indicatorsXml = ET.SubElement(root, "indicators")
indicatorsXml = root.find("indicators")
maxScore += int(indicators['1265'].severity)
if not self.checkImportNumber():
score += int(indicators['1265'].severity)
str = constants.RED + "The count (%d) of imports is suspicious" % len(self.imports) + constants.RESET
if not table is None:
table.add_row([str, indicators['1265'].severity])
if not jsonDict is None:
jsonResults.append({"indicator": "The count (%d) of imports is suspicious" % len(self.imports), "severity": indicators['1265'].severity})
if not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "function")
indicatorXml.set("severity", indicators['1265'].severity)
indicatorXml.text = "The count (%d) of imports is suspicious" % len(self.imports)
featureSet = set()
# TODO: we can also print it as table with the severity (and sum up the severity over all things)
for feature in ET.parse("xml/features.xml").getroot().find('features').findall('features'):
maxScore += int(indicators[feature.attrib["id"]])
for lib in feature.find('libs').findall('lib'):
for fct in lib.find('fcts').findall('fct'):
if lib.attrib["name"] == "" and fct.text == "":
continue
matchingImps = filter(lambda imp: lib.attrib["name"] in imp.lib and fct.text in imp.fct, self.imports)
if len(matchingImps) > 0:
id = fct.attrib["id"]
featureSet.add(id)
for k, indicator in indicators.items():
if k in featureSet and indicator.enable == "1":
score += int(indicator.severity)
str = constants.RED + indicator.text + constants.RESET
if not table is None:
table.add_row([str, indicator.severity])
if not jsonDict is None:
jsonResults.append({"indicator": str, "severity": indicator.severity})
if not root is None:
indicatorXml = ET.SubElement(indicatorsXml, "function")
indicatorXml.set("severity", indicator.severity)
indicatorXml.text = indicator.text
if not jsonDict is None:
jsonDict["indicators"]["functions"] = jsonResults
return score, maxScore, jsonDict, root
def __getImports(self):
self.imports = []
for i in self.peFile.imports:
for e in i.entries:
self.imports.append(Import(i.name.lower(), e.name))
def checkImportNumber(self):
'''
Extract the min/max number of imports and check if the number of imports in the PE
file is in that range
'''
if self.imports is None:
self.__getImports()
root = ET.parse("xml/thresholds.xml").getroot()
min = int(root.find('thresholds').find('minimums').find('Imports').text)
max = int(root.find('thresholds').find('maximums').find('Imports').text)
real = len(self.imports)
return min < real < max
def __read_groups(self):
root = ET.parse("xml/translations.xml").getroot()
groups = {'--': "undefined"}
for group in root.find('groups').findall('group'):
groups[group.attrib['id']] = group.text
return groups
def checkImphashes(self):
'''
Parses the xml/functions.xml file and checks the imphash of the binary
'''
imphash = lief.PE.get_imphash(self.peFile).lower()
root = ET.parse("xml/functions.xml").getroot()
for hash in root.find('imphashes').findall('imphash'):
if imphash == hash.text.lower():
print(constants.RED + "\tFound matching imphash (%s) for the file" % imphash + constants.RESET)
def blacklistedImports(self):
'''
Parses the xml/functions.xml file and checks the functions blacklisted in the
file against the imports found in the PE file. Returns the list of all matches.
TODO: Support the md5 hashes
TODO: Support the families
TODO: Support the imphashes
'''
if self.imports is None:
self.__getImports()
root = ET.parse("xml/functions.xml").getroot()
groups = self.__read_groups()
# Get all the blacklisted functions and libraries by name
self.suspiciousFunctions = []
for lib in root.find('libs').findall('lib'):
if lib.find('fcts') is None:
f = list(filter(lambda i: i.lib == lib.attrib['name'], self.imports))
for function in f:
if 'group' in lib.attrib:
function.group = groups[lib.attrib['group']]
else:
function.group = groups["--"]
function.blacklisted = True
self.suspiciousFunctions += f
continue
for fct in lib.find('fcts'):
f = list(filter(lambda i: i.lib == lib.attrib['name'] and i.fct == fct.text, self.imports))
for function in f:
if 'group' in fct.attrib:
function.group = groups[fct.attrib['group']]
else:
function.group = groups["--"]
function.blacklisted = True
self.suspiciousFunctions += f
# TODO: We can replace the suspicious functions with filtering for imports which are blacklisted
return self.suspiciousFunctions, self.imports
def printImportInformation(self):
reasonableNumber = self.checkImportNumber()
if not reasonableNumber:
print(constants.RED + "Suspicious number of imports (%d)" % len(self.imports) + constants.RESET)
elif all:
print(constants.GREEN + "Number of imports is in a reasonable range (%d)" % len(self.imports), constants.RESET)
self.blacklistedImports()
if len(self.suspiciousFunctions):
print(constants.RED + "The following %d out of %d imports are blacklisted:" % (len(self.suspiciousFunctions), len(self.imports)) + constants.RESET)
table = prettytable.PrettyTable()
table.field_names = ["Library", "Function", "Group"]
for imp in self.suspiciousFunctions:
table.add_row([imp.lib, imp.fct, imp.group])
resultString = str(re.sub(r'(^|\n)', r'\1\t', str(table)))
print(resultString)
else:
print(constants.GREEN + "None of the imports is blacklisted.", constants.RESET)
def getImportXml(self, root):
self.blacklistedImports()
imports = ET.SubElement(root, "Imports")
summary = ET.SubElement(imports, "summary")
ET.SubElement(summary, "blacklisted").text = str(len(self.suspiciousFunctions))
ET.SubElement(summary, "total").text = str(len(self.imports))
blacklisted = ET.SubElement(imports, "blacklisted")
# TODO: We can also show all functions and tell which ones are blacklisted
for imp in self.suspiciousFunctions:
fct = ET.SubElement(blacklisted, "function")
fct.set("library", imp.lib)
fct.set("group", imp.group)
fct.set("blacklisted", str(imp.blacklisted))
fct.text = imp.fct
return root
def getImportJson(self, jsonDict):
self.blacklistedImports()
res = {"summary": {"blacklisted": str(len(self.suspiciousFunctions)), "total": str(len(self.imports))}}
res["blacklisted"] = []
for imp in self.suspiciousFunctions:
res["blacklisted"].append({"library": imp.lib, "group": imp.group, "blacklisted": str(imp.blacklisted), "function": imp.fct})
jsonDict["Imports"] = res
return jsonDict
def __getResources(self):
self.resources = []
if self.peFile.has_resources:
for resourceType in self.peFile.resources.childs:
for resource in resourceType.childs:
for lang in resource.childs:
name = resource.name if resource.has_name else hex(resource.id)
md5 = hashlib.md5(bytes(lang.content))
self.resources.append(Resource(resourceType.id, name, lang.id, md5, bytes(lang.content)))
return self.resources
def blacklistedResources(self):
'''
Parses the xml/resources.xml file and returns the list of blacklisted resources that
are used by the PE file to analyze.
'''
# Get the MD5 of resources used by the PE file
#resourceMD5 = [hashlib.md5(r.data).hexdigest().upper() for r in self.peFile.resources]
if self.resources is None:
self.__getResources()
resourceMD5 = [res.md5 for res in self.resources]
# Get the program name from translations file
translations = ET.parse("xml/translations.xml").getroot().find('knownResources')
dict = {}
for t in translations: