detection.wiki

Detection rules › Sigma

ETW Logging Disabled For rpcrt4.dll

Status
test
Severity
low
Log source
category registry_set, product windows
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects changes to the "ExtErrorInformation" key in order to disable ETW logging for rpcrt4.dll

MITRE ATT&CK coverage

TacticTechniques
Persistence
Defense Impairment

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 13: RegistryEvent (Value Set)

Rule body

title: ETW Logging Disabled For rpcrt4.dll
id: 90f342e1-1aaa-4e43-b092-39fda57ed11e
status: test
description: Detects changes to the "ExtErrorInformation" key in order to disable ETW logging for rpcrt4.dll
references:
    - http://redplait.blogspot.com/2020/07/whats-wrong-with-etw.html
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-12-09
modified: 2023-08-17
tags:
    - attack.persistence
    - attack.defense-impairment
    - attack.t1112
    - attack.t1685
logsource:
    product: windows
    category: registry_set
detection:
    selection:
        TargetObject|endswith: '\Microsoft\Windows NT\Rpc\ExtErrorInformation'
        Details:
            # This is disabled by default for some reason
            - 'DWORD (0x00000000)' # Off
            - 'DWORD (0x00000002)' # Off with exceptions
    condition: selection
falsepositives:
    - Unknown
level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|endswith: '\Microsoft\Windows NT\Rpc\ExtErrorInformation'
    Details:
        - 'DWORD (0x00000000)'
        - 'DWORD (0x00000002)'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
Detailseq
  • DWORD (0x00000000) corpus 38 (sigma 36, chronicle 2)
  • DWORD (0x00000002) corpus 10 (sigma 9, chronicle 1)
field:"Details" kind:eq
TargetObjectends_with
  • \Microsoft\Windows NT\Rpc\ExtErrorInformation
field:"TargetObject" kind:ends_with value:"\Microsoft\Windows NT\Rpc\ExtErrorInformation"