SigmaHQ/rules/windows/process_creation/win_possible_applocker_bypass.yml

title: Possible Applocker Bypass
description: Detects execution of executables that can be used to bypass Applocker whitelisting
status: experimental
references:
    - https://github.com/subTee/ApplicationWhitelistBypassTechniques/blob/master/TheList.txt
    - https://room362.com/post/2014/2014-01-16-application-whitelist-bypass-using-ieexec-dot-exe/
author: juju4
tags:
    - attack.defense_evasion
    - attack.t1118
    - attack.t1121
    - attack.t1127
    - attack.t1170
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine:
            - '*\msdt.exe*'
            - '*\installutil.exe*'
            - '*\regsvcs.exe*'
            - '*\regasm.exe*'
            # - '*\regsvr32.exe*'  # too many FPs, very noisy
            - '*\msbuild.exe*'
            - '*\ieexec.exe*'
            - '*\mshta.exe*'
            - '*\csc.exe*'
    condition: selection
falsepositives:
    - False positives depend on scripts and administrative tools used in the monitored environment
    - Using installutil to add features for .NET applications (primarly would occur in developer environments)
level: low