Query: Sigma rule for Detect commandline usage of Microsoft Connection Manager Profile Installer (cmstp.exe) to install specially formatted lo
Matching passage: Sigma rule: Detect commandline usage of Microsoft Connection Manager Profile Installer (cmstp.exe) to install specially formatted lo. Logsource: windows / process_creation. Rule: title: Bypass UAC via CMSTP id: e66779cc-383e-4224-a3a4-267eeb585c40 status: test description: Detect commandline usage of Microsoft Connection Manager Profile Installer (cmstp.exe) to install specially formatted local .INF files references: - https://eqllib.readthedocs.io/en/latest/analytics/e584f1a1-c303-4885-8a66-21360c90995b.html - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1218.003/T1218.003.md - https://lolbas-project.github.io/lolbas/Binaries/Cmstp/ author: E.M. Anhaus (originally from Atomic Blue Detections, Endgame), oscd.community date: 2019-10-24 modified: 2022-08-30 tags: - attack.privilege-escalation - attack.stealth - attack.t1548.002 - attack.t1218.003 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \cmstp.exe - OriginalFileName: CMSTP.EXE selection_cli: CommandLine|contains: - /s - -s - /au - -au - /ni - -ni condition: all of selection* falsepositives: - Legitimate use of cmstp.exe utility by legitimate user level: high
Near-miss passage: Sigma rule: Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs. Logsource: windows / ps_script. Rule: title: Suspicious Eventlog Clear id: 0f017df3-8f5a-414f-ad6b-24aff1128278 related: - id: cc36992a-4671-4f21-a91d-6c2b72a2edf5 type: derived status: test description: Detects usage of known powershell cmdlets such as "Clear-EventLog" to clear the Windows event logs references: - https://twitter.com/oroneequalsone/status/1568432028361830402 - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.001/T1070.001.md - https://eqllib.readthedocs.io/en/latest/analytics/5b223758-07d6-4100-9e11-238cfdd0fe97.html - https://stackoverflow.com/questions/66011412/how-to-clear-a-event-log-in-powershell-7 - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventing.reader.eventlogsession.clearlog?view=windowsdesktop-9.0&viewFallbackFrom=dotnet-plat-ext-5.0#System_Diagnostics_Eventing_Reader_EventLogSession_ClearLog_System_String_ - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear author: Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems) date: 2022-09-12 modified: 2025-10-06 tags: - attack.defense-impairment - attack.t1685.005 logsource: product: windows category: ps_script definition: 'Requirements: Script Block Logging must be enabled' detection: selection: - ScriptBlockText|contains: - 'Clear-EventLog ' - 'Remove-EventLog ' - 'Limit-EventLog ' - 'Clear-WinEvent ' - ScriptBlockText|contains|all: - Eventing.Reader.EventLogSession - ClearLog - ScriptBlockText|contains|all: - Diagnostics.EventLog - Clear condition: selection falsepositives: - Rare need to clear logs before doing something. Sometimes used by installers or cleaner scripts. The script should be investigated to determine if it's legitimate level: medium