sigmahighHunting

ETW Logging Tamper In .NET Processes Via CommandLine

Detects changes to environment variables related to ETW logging via the CommandLine. This could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.

MITRE ATT&CK

T1562

defense-evasion

Detection Query

selection:
  CommandLine|contains:
    - COMPlus_ETWEnabled
    - COMPlus_ETWFlags
condition: selection

Author

Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)

Created

2020-05-02

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1562

Raw Content

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