Detection rules › Sigma
Invoke-Obfuscation STDIN+ Launcher - Security
Detects Obfuscated use of stdin to execute PowerShell
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell |
| Stealth | T1027 Obfuscated Files or Information |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Security-Auditing | Event ID 4697 | A service was installed in the system. |
Rule body yaml
title: Invoke-Obfuscation STDIN+ Launcher - Security
id: 0c718a5e-4284-4fb9-b4d9-b9a50b3a1974
related:
- id: 72862bf2-0eb1-11eb-adc1-0242ac120002
type: derived
status: test
description: Detects Obfuscated use of stdin to execute PowerShell
references:
- https://github.com/SigmaHQ/sigma/issues/1009 # (Task 25)
author: Jonathan Cheong, oscd.community
date: 2020-10-15
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:
- 'cmd'
- 'powershell'
selection2:
ServiceFileName|contains:
- '${input}'
- 'noexit'
selection3:
ServiceFileName|contains:
- ' /c '
- ' /r '
condition: all of selection*
falsepositives:
- Unknown
level: high
Stages and Predicates
Stage 0: condition
all of selection*Stage 1: selection
selection:
EventID: 4697
ServiceFileName|contains|all:
- 'cmd'
- 'powershell'
Stage 2: selection2
selection2:
ServiceFileName|contains:
- '${input}'
- 'noexit'
Stage 3: selection3
selection3:
ServiceFileName|contains:
- ' /c '
- ' /r '
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.
| Field | Kind | Values |
|---|---|---|
ServiceFileName | match |
|