Sigma rule: Invoke-Obfuscation STDIN+ Launcher - Powershell

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-3cb63277040b, updated 2024-04-05T00:00:00.000Z.

Rule

Title
Invoke-Obfuscation STDIN+ Launcher - Powershell
Status
test
Level
high
Author
Jonathan Cheong, oscd.community
Date
2020-10-15
Modified
2024-04-05
File
rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_stdin.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects Obfuscated use of stdin to execute PowerShell

Log source

product
windows
category
ps_script
definition
Requirements: Script Block Logging must be enabled

Detection

selection_4104:
    ScriptBlockText|re: 'cmd.{0,5}(?:/c|/r).+powershell.+(?:\$?\{?input\}?|noexit).+"'
condition: selection_4104

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.stealth
  • attack.t1027
  • attack.execution
  • attack.t1059.001

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_stdin.yml

Sources and licences

  • SigmaHQ

    "Invoke-Obfuscation STDIN+ Launcher - Powershell" by Jonathan Cheong, oscd.community (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_invoke_obfuscation_stdin.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Invoke-Obfuscation STDIN+ Launcher - Powershell",
entity page, dataset version ref-3cb63277040b, updated 2024-04-05T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/779c8c12-0eb1-11eb-adc1-0242ac120002 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 779c8c12-0eb1-11eb-adc1-0242ac120002, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.