Empire_Invoke_PsExec

rule Empire_Invoke_PsExec {
   meta:
      description = "Detects Empire component - file Invoke-PsExec.ps1"
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "https://github.com/adaptivethreat/Empire"
      date = "2016-11-05"
      hash1 = "0218be4323959fc6379489a6a5e030bb9f1de672326e5e5b8844ab5cedfdcf88"
      id = "19aaec3e-3e8f-5d7d-9c70-a212756c0300"
   strings:
      $s1 = "Invoke-PsExecCmd" fullword ascii
      $s2 = "\"[*] Executing service .EXE" fullword ascii
      $s3 = "$cmd = \"%COMSPEC% /C echo $Command ^> %systemroot%\\Temp\\" ascii
   condition:
      ( uint16(0) == 0x7566 and filesize < 50KB and 1 of them ) or all of them
}