title: Suspicious DotNET CLR Usage Log Artifact
id: e0b06658-7d1d-4cd3-bf15-03467507ff7c
related:
    - id: 4508a70e-97ef-4300-b62b-ff27992990ea
      type: derived
    - id: e4b63079-6198-405c-abd7-3fe8b0ce3263
      type: obsolete
status: test
description: Detects the creation of Usage Log files by the CLR (clr.dll). These files are named after the executing process once the assembly is finished executing for the first time in the (user) session context.
references:
    - https://bohops.com/2021/03/16/investigating-net-clr-usage-log-tampering-techniques-for-edr-evasion/
    - https://github.com/olafhartong/sysmon-modular/blob/fa1ae53132403d262be2bbd7f17ceea7e15e8c78/11_file_create/include_dotnet.xml
    - https://web.archive.org/web/20221026202428/https://gist.github.com/code-scrap/d7f152ffcdb3e0b02f7f394f5187f008
    - https://web.archive.org/web/20230329154538/https://blog.menasec.net/2019/07/interesting-difr-traces-of-net-clr.html
author: frack113, omkar72, oscd.community, Wojciech Lesicki
date: 2022-11-18
modified: 2023-02-23
tags:
    - attack.stealth
    - attack.t1218
logsource:
    category: file_event
    product: windows
    definition: 'Requirements: UsageLogs folder must be monitored by the sysmon configuration'
detection:
    selection:
        TargetFilename|endswith:
            - '\UsageLogs\cmstp.exe.log'
            - '\UsageLogs\cscript.exe.log'
            - '\UsageLogs\mshta.exe.log'
            - '\UsageLogs\msxsl.exe.log'
            - '\UsageLogs\regsvr32.exe.log'
            - '\UsageLogs\rundll32.exe.log'
            - '\UsageLogs\svchost.exe.log'
            - '\UsageLogs\wscript.exe.log'
            - '\UsageLogs\wmic.exe.log'
    filter_main_rundll32:
        # This filter requires the event to be enriched by additional information such as ParentImage and CommandLine activity
        ParentImage|endswith: '\MsiExec.exe'
        ParentCommandLine|contains: ' -Embedding'
        Image|endswith: '\rundll32.exe'
        CommandLine|contains|all:
            - 'Temp'
            - 'zzzzInvokeManagedCustomActionOutOfProc'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Rundll32.exe with zzzzInvokeManagedCustomActionOutOfProc in command line and msiexec.exe as parent process - https://twitter.com/SBousseaden/status/1388064061087260675
level: high