ETW Logging Tamper In .NET Processes

calendar Feb 21, 2023 · attack.defense_evasion attack.t1562  ·
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Detects changes to environment variables related to ETW logging. This could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.

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 1title: ETW Logging Tamper In .NET Processes
 2id: 41421f44-58f9-455d-838a-c398859841d4
 3status: test
 4description: Detects changes to environment variables related to ETW logging. This could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.
 5references:
 6    - https://twitter.com/_xpn_/status/1268712093928378368
 7    - https://social.msdn.microsoft.com/Forums/vstudio/en-US/0878832e-39d7-4eaf-8e16-a729c4c40975/what-can-i-use-e13c0d23ccbc4e12931bd9cc2eee27e4-for?forum=clr
 8    - https://github.com/dotnet/runtime/blob/ee2355c801d892f2894b0f7b14a20e6cc50e0e54/docs/design/coreclr/jit/viewing-jit-dumps.md#setting-configuration-variables
 9    - https://github.com/dotnet/runtime/blob/f62e93416a1799aecc6b0947adad55a0d9870732/src/coreclr/src/inc/clrconfigvalues.h#L35-L38
10    - https://github.com/dotnet/runtime/blob/7abe42dc1123722ed385218268bb9fe04556e3d3/src/coreclr/src/inc/clrconfig.h#L33-L39
11    - https://github.com/dotnet/runtime/search?p=1&q=COMPlus_&unscoped_q=COMPlus_
12    - https://bunnyinside.com/?term=f71e8cb9c76a
13    - http://managed670.rssing.com/chan-5590147/all_p1.html
14    - https://github.com/dotnet/runtime/blob/4f9ae42d861fcb4be2fcd5d3d55d5f227d30e723/docs/coding-guidelines/clr-jit-coding-conventions.md#1412-disabling-code
15    - https://i.blackhat.com/EU-21/Wednesday/EU-21-Teodorescu-Veni-No-Vidi-No-Vici-Attacks-On-ETW-Blind-EDRs.pdf
16author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)
17date: 2020/05/02
18modified: 2022/12/09
19tags:
20    - attack.defense_evasion
21    - attack.t1562
22logsource:
23    category: process_creation
24    product: windows
25detection:
26    selection:
27        CommandLine|contains:
28            - 'COMPlus_ETWEnabled'
29            - 'COMPlus_ETWFlags'
30    condition: selection
31falsepositives:
32    - Unlikely
33level: high

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