Detectionhightest

Potential Persistence Via Security Descriptors - ScriptBlock

Detects usage of certain functions and keywords that are used to manipulate security descriptors in order to potentially set a backdoor. As seen used in the DAMP project.

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Launch

Nasreddine Bencherchali (Nextron Systems)Created Thu Jan 052f77047c-e6e9-4c11-b088-a3de399524cdwindows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection:
        ScriptBlockText|contains|all:
            - 'win32_Trustee'
            - 'win32_Ace'
            - '.AccessMask'
            - '.AceType'
            - '.SetSecurityDescriptor'
        ScriptBlockText|contains:
            - '\Lsa\JD'
            - '\Lsa\Skew1'
            - '\Lsa\Data'
            - '\Lsa\GBG'
    condition: selection