Detectionhightest

LSASS Access From Potentially White-Listed Processes

Detects a possible process memory dump that uses a white-listed filename like TrolleyExpress.exe as a way to dump the LSASS process memory without Microsoft Defender interference

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Launch

Florian Roth (Nextron Systems)Created Thu Feb 10Updated Wed Nov 294be8b654-0c01-4c9d-a10c-6b28467fc651windows

Log Source

WindowsProcess Access

ProductWindows← raw: windows

CategoryProcess Access← raw: process_access

Events when a process opens a handle to another process, commonly used for credential dumping via LSASS.

Detection Logic

detection:
    selection:
        TargetImage|endswith: '\lsass.exe'
        SourceImage|endswith:
            - '\TrolleyExpress.exe'  # Citrix
            - '\ProcessDump.exe'     # Cisco Jabber
            - '\dump64.exe'          # Visual Studio
        GrantedAccess|endswith:
            - '10'
            - '30'
            - '50'
            - '70'
            - '90'
            - 'B0'
            - 'D0'
            - 'F0'
            - '18'
            - '38'
            - '58'
            - '78'
            - '98'
            - 'B8'
            - 'D8'
            - 'F8'
            - '1A'
            - '3A'
            - '5A'
            - '7A'
            - '9A'
            - 'BA'
            - 'DA'
            - 'FA'
            - '0x14C2'  # https://github.com/b4rtik/ATPMiniDump/blob/76304f93b390af3bb66e4f451ca16562a479bdc9/ATPMiniDump/ATPMiniDump.c
            - 'FF'
    condition: selection