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Detection rules › Sigma

Invoke-Obfuscation RUNDLL LAUNCHER - Security

Status
test
Severity
medium
Log source
product windows, service security
Author
Timur Zinniatullin, oscd.community
Source
github.com/SigmaHQ/sigma

Detects Obfuscated Powershell via RUNDLL LAUNCHER

MITRE ATT&CK coverage

TacticTechniques
Execution
Stealth

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 4697: A service was installed in the system.

Rule body

title: Invoke-Obfuscation RUNDLL LAUNCHER - Security
id: f241cf1b-3a6b-4e1a-b4f9-133c00dd95ca
related:
    - id: 11b52f18-aaec-4d60-9143-5dd8cc4706b9
      type: derived
status: test
description: Detects Obfuscated Powershell via RUNDLL LAUNCHER
references:
    - https://github.com/SigmaHQ/sigma/issues/1009 # (Task 23)
author: Timur Zinniatullin, oscd.community
date: 2020-10-18
modified: 2022-11-29
tags:
    - attack.stealth
    - attack.t1027
    - attack.execution
    - attack.t1059.001
logsource:
    product: windows
    service: security
    definition: The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
detection:
    selection:
        EventID: 4697
        ServiceFileName|contains|all:
            - 'rundll32.exe'
            - 'shell32.dll'
            - 'shellexec_rundll'
            - 'powershell'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    EventID: 4697
    ServiceFileName|contains|all:
        - 'rundll32.exe'
        - 'shell32.dll'
        - 'shellexec_rundll'
        - 'powershell'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ServiceFileNamematch
  • powershell corpus 4 (sigma 4)
  • rundll32.exe
  • shell32.dll corpus 2 (sigma 2)
  • shellexec_rundll corpus 2 (sigma 2)
field:"ServiceFileName" kind:match