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Detection rules › Sigma

PowerShell Logging Disabled Via Registry Key Tampering

Status
test
Severity
high
Log source
product windows, category registry_set
Author
frack113
Source
github.com/SigmaHQ/sigma

Detects changes to the registry for the currently logged-in user. In order to disable PowerShell module logging, script block logging or transcription and script execution logging

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1112 Modify Registry
StealthT1564.001 Hide Artifacts: Hidden Files and Directories
Defense ImpairmentT1112 Modify Registry

Event coverage

ProviderEventTitle
SysmonEvent ID 13RegistryEvent (Value Set)

Rule body yaml

title: PowerShell Logging Disabled Via Registry Key Tampering
id: fecfd1a1-cc78-4313-a1ea-2ee2e8ec27a7
status: test
description: Detects changes to the registry for the currently logged-in user. In order to disable PowerShell module logging, script block logging or transcription and script execution logging
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1112/T1112.md#atomic-test-32---windows-powershell-logging-disabled
author: frack113
date: 2022-04-02
modified: 2023-08-17
tags:
    - attack.stealth
    - attack.defense-impairment
    - attack.t1564.001
    - attack.t1112
    - attack.persistence
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains:
            - '\Microsoft\Windows\PowerShell\' # PowerShell 5
            - '\Microsoft\PowerShellCore\' # PowerShell 7
        TargetObject|endswith:
            - '\ModuleLogging\EnableModuleLogging'
            - '\ScriptBlockLogging\EnableScriptBlockLogging'
            - '\ScriptBlockLogging\EnableScriptBlockInvocationLogging'
            - '\Transcription\EnableTranscripting'
            - '\Transcription\EnableInvocationHeader'
            - '\EnableScripts'
        Details: 'DWORD (0x00000000)'
    condition: selection
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/registry/registry_set/registry_set_powershell_logging_disabled/info.yml
simulation:
    - type: atomic-red-team
      name: Disable PowerShell Logging via Registry
      technique: T1112
      atomic_guid: 95b25212-91a7-42ff-9613-124aca6845a8

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|contains:
        - '\Microsoft\Windows\PowerShell\'
        - '\Microsoft\PowerShellCore\'
    TargetObject|endswith:
        - '\ModuleLogging\EnableModuleLogging'
        - '\ScriptBlockLogging\EnableScriptBlockLogging'
        - '\ScriptBlockLogging\EnableScriptBlockInvocationLogging'
        - '\Transcription\EnableTranscripting'
        - '\Transcription\EnableInvocationHeader'
        - '\EnableScripts'
    Details: 'DWORD (0x00000000)'

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
Detailseq
  • DWORD (0x00000000) corpus 38 (sigma 36, chronicle 2)
TargetObjectends_with
  • \EnableScripts
  • \ModuleLogging\EnableModuleLogging
  • \ScriptBlockLogging\EnableScriptBlockInvocationLogging
  • \ScriptBlockLogging\EnableScriptBlockLogging
  • \Transcription\EnableInvocationHeader
  • \Transcription\EnableTranscripting
TargetObjectmatch
  • \Microsoft\PowerShellCore\
  • \Microsoft\Windows\PowerShell\