Susp_PowerShell_Sep17_2

rule Susp_PowerShell_Sep17_2 {
   meta:
      description = "Detects suspicious PowerShell script in combo with VBS or JS "
      license = "Detection Rule License 1.1 https://github.com/Neo23x0/signature-base/blob/master/LICENSE"
      author = "Florian Roth (Nextron Systems)"
      reference = "Internal Research"
      date = "2017-09-30"
      hash1 = "e387f6c7a55b85e0675e3b91e41e5814f5d0ae740b92f26ddabda6d4f69a8ca8"
      id = "e44d1dfc-0858-5248-a57f-efb5c647f4cc"
   strings:
      $x1 = ".Run \"powershell.exe -nop -w hidden -e " ascii
      $x2 = "FileExists(path + \"\\..\\powershell.exe\")" fullword ascii
      $x3 = "window.moveTo -4000, -4000" fullword ascii

      $s1 = "= CreateObject(\"Wscript.Shell\")" fullword ascii
   condition:
      filesize < 20KB and (
         ( uint16(0) == 0x733c and 1 of ($x*) )
          or 2 of them
      )
}