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Detection rules › Sigma

Invoke-Obfuscation Via Stdin - System

Severity
high
Author
Nikita Nazarov, oscd.community
Source
upstream

Detects Obfuscated Powershell via Stdin in Scripts

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: selection

or:
ImagePath|contains: environment
ImagePath|contains: input
ImagePath|contains: invoke
ImagePath|contains: '&&'
ImagePath|contains: set
Provider_Name: 'Service Control Manager'

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
  • && corpus 4 (sigma 4)
  • environment
  • input corpus 2 (sigma 2)
  • invoke corpus 2 (sigma 2)
  • set
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.