Emerging Threathightest

UNC2452 Process Creation Patterns

Detects a specific process creation patterns as seen used by UNC2452 and provided by Microsoft as Microsoft Defender ATP queries

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Florian Roth (Nextron Systems)Created Fri Jan 22Updated Thu Sep 129be34ad0-b6a7-4fbd-91cf-fc7ec1047f5f2020

Emerging Threat

Active Threat

Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    # To avoid writing complex condition. "selection_generic_1" and "selection_generic_2" are the same except for the extension used.
    selection_generic_1:
        CommandLine|contains:
            - '7z.exe a -v500m -mx9 -r0 -p'
            - '7z.exe a -mx9 -r0 -p'
        CommandLine|contains|all:
            - '.zip'
            - '.txt'
    selection_generic_2:
        CommandLine|contains:
            - '7z.exe a -v500m -mx9 -r0 -p'
            - '7z.exe a -mx9 -r0 -p'
        CommandLine|contains|all:
            - '.zip'
            - '.log'
    selection_generic_3:
        ParentCommandLine|contains|all:
            - 'wscript.exe'
            - '.vbs'
        CommandLine|contains|all:
            - 'rundll32.exe'
            - 'C:\Windows'
            - '.dll,Tk_'
    selection_generic_4:
        ParentImage|endswith: '\rundll32.exe'
        ParentCommandLine|contains|all:
            - 'C:\Windows'
            - '.dll'
        CommandLine|contains: 'cmd.exe /C '
    selection_generic_5:
        ParentImage|endswith: '\rundll32.exe'
        Image|endswith: '\dllhost.exe'
        CommandLine: ''
    condition: 1 of selection_generic_*