ETW Logging Disabled For rpcrt4.dll

calendar Aug 17, 2023 · attack.defense_evasion attack.t1112 attack.t1562  ·
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Detects changes to the "ExtErrorInformation" key in order to disable ETW logging for rpcrt4.dll

Sigma rule (View on GitHub)

 1title: ETW Logging Disabled For rpcrt4.dll
 2id: 90f342e1-1aaa-4e43-b092-39fda57ed11e
 3status: experimental
 4description: Detects changes to the "ExtErrorInformation" key in order to disable ETW logging for rpcrt4.dll
 5references:
 6    - http://redplait.blogspot.com/2020/07/whats-wrong-with-etw.html
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2022/12/09
 9modified: 2023/08/17
10tags:
11    - attack.defense_evasion
12    - attack.t1112
13    - attack.t1562
14logsource:
15    product: windows
16    category: registry_set
17detection:
18    selection:
19        TargetObject|endswith: '\Microsoft\Windows NT\Rpc\ExtErrorInformation'
20        Details:
21            # This is disabled by default for some reason
22            - 'DWORD (0x00000000)' # Off
23            - 'DWORD (0x00000002)' # Off with exceptions
24    condition: selection
25falsepositives:
26    - Unknown
27level: low

References

  • what`s wrong with Etw

    Disclaimer:  as I am aware that the given code examples can be dangerous for Etw-based EDR products - all code was made for least popular ve...


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