PowerShell_Emp_Eval_Jul17_A1_RID3141

YARA detection rule by Florian Roth · CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/

Detects suspicious sample with PowerShell content

rule PowerShell_Emp_Eval_Jul17_A1_RID3141 : DEMO EXE FILE HKTL SCRIPT T1059_001 {
   meta:
      description = "Detects suspicious sample with PowerShell content "
      author = "Florian Roth"
      reference = "PowerShell Empire Eval"
      date = "2017-07-27 13:14:41"
      score = 75
      customer = "demo"
      license = "CC-BY-NC https://creativecommons.org/licenses/by-nc/4.0/"
      hash1 = "4d10e80c7c80ef040efc680424a429558c7d76a965685bbc295908cb71137eba"
      tags = "DEMO, EXE, FILE, HKTL, SCRIPT, T1059_001"
      minimum_yara = "3.5.0"
      
   strings:
      $s1 = "powershell" wide
      $s2 = "pshcmd" fullword ascii
   condition: 
      ( uint16 ( 0 ) == 0x5a4d and filesize < 30KB and all of them )
}

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

a2e9458d-d5e1-4436-bfa6-b95b5b6cf047

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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