ETW Logging Tamper In .NET Processes Via CommandLine

Title: ETW Logging Tamper In .NET Processes Via CommandLine
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-impairment'
• -'attack.t1685'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection:
    CommandLine|contains:
      -'COMPlus_ETWEnabled'
      -'COMPlus_ETWFlags'

  condition:selection
Falsepositives:
  -Unlikely
Level: high