{"id":"41421f44-58f9-455d-838a-c398859841d4","title":"ETW Logging Tamper In .NET Processes Via CommandLine","description":"Detects changes to environment variables related to ETW logging via the CommandLine.\nThis could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.\n","author":"Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)","status":"test","level":"high","date":"2020-05-02","modified":"2022-12-09","tags":["attack.defense-impairment","attack.t1685"],"technique_ids":["T1685"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unlikely"],"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"],"source_path":"rules/windows/process_creation/proc_creation_win_susp_etw_modification_cmdline.yml","source_sha256":"77865ed4de71fe18e9a04fd05f9460d456055d36a6e23cd2b6183fb2819fb5ec","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_susp_etw_modification_cmdline.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: ETW Logging Tamper In .NET Processes Via CommandLine\nid: 41421f44-58f9-455d-838a-c398859841d4\nstatus: test\ndescription: |\n    Detects changes to environment variables related to ETW logging via the CommandLine.\n    This could indicate potential adversaries stopping ETW providers recording loaded .NET assemblies.\nreferences:\n    - https://twitter.com/_xpn_/status/1268712093928378368\n    - https://social.msdn.microsoft.com/Forums/vstudio/en-US/0878832e-39d7-4eaf-8e16-a729c4c40975/what-can-i-use-e13c0d23ccbc4e12931bd9cc2eee27e4-for?forum=clr\n    - https://github.com/dotnet/runtime/blob/ee2355c801d892f2894b0f7b14a20e6cc50e0e54/docs/design/coreclr/jit/viewing-jit-dumps.md#setting-configuration-variables\n    - https://github.com/dotnet/runtime/blob/f62e93416a1799aecc6b0947adad55a0d9870732/src/coreclr/src/inc/clrconfigvalues.h#L35-L38\n    - https://github.com/dotnet/runtime/blob/7abe42dc1123722ed385218268bb9fe04556e3d3/src/coreclr/src/inc/clrconfig.h#L33-L39\n    - https://github.com/dotnet/runtime/search?p=1&q=COMPlus_&unscoped_q=COMPlus_\n    - https://bunnyinside.com/?term=f71e8cb9c76a\n    - http://managed670.rssing.com/chan-5590147/all_p1.html\n    - https://github.com/dotnet/runtime/blob/4f9ae42d861fcb4be2fcd5d3d55d5f227d30e723/docs/coding-guidelines/clr-jit-coding-conventions.md#1412-disabling-code\n    - https://i.blackhat.com/EU-21/Wednesday/EU-21-Teodorescu-Veni-No-Vidi-No-Vici-Attacks-On-ETW-Blind-EDRs.pdf\nauthor: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research)\ndate: 2020-05-02\nmodified: 2022-12-09\ntags:\n    - attack.defense-impairment\n    - attack.t1685\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        CommandLine|contains:\n            - 'COMPlus_ETWEnabled'\n            - 'COMPlus_ETWFlags'\n    condition: selection\nfalsepositives:\n    - Unlikely\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1685","id":"T1685","name":"Disable or Modify Tools","page":"techniques/enterprise/T1685/"}],"data_path":"data/detection-rules/41421f44-58f9-455d-838a-c398859841d4.json","kind":"sigma"}