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Detection rules › Sigma

Invoke-Obfuscation STDIN+ Launcher - System

Severity
high
Author
Jonathan Cheong, oscd.community
Source
upstream

Detects Obfuscated use of stdin to execute PowerShell

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1059.001 Command and Scripting Interpreter: PowerShell
Defense EvasionT1027 Obfuscated Files or Information

Event coverage

ProviderEvent IDTitle
Service-Control-Manager7045

Stages and Predicates

Stage 1: all of selection_main

or:
ImagePath|contains: '/c'
ImagePath|contains: '/r'
ImagePath|contains: cmd
ImagePath|contains: powershell
Provider_Name: 'Service Control Manager'

Stage 2: all of selection_other

or:
ImagePath|contains: '$'
ImagePath|contains: input
ImagePath|contains: noexit

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ImagePathmatch
  • $
  • /c corpus 4 (sigma 4)
  • /r corpus 2 (sigma 2)
  • cmd corpus 5 (sigma 5)
  • input corpus 2 (sigma 2)
  • noexit
  • powershell corpus 5 (sigma 5)
Provider_Nameeq
  • Service Control Manager corpus 43 (sigma 43)

Neighbors

Broader alternatives (more inclusive than this rule)

These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.