Emerging Threatcriticaltest

HAFNIUM Exchange Exploitation Activity

Detects activity observed by different researchers to be HAFNIUM group activity (or related) on Exchange servers

Convert In Phoenix Studio

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

Florian Roth (Nextron Systems)Created Tue Mar 09Updated Thu Mar 09bbb2dedd-a0e3-46ab-ba6c-6c82ae7a9aa72021

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:
    selection_attrib:
        CommandLine|contains|all:
            - 'attrib'
            - ' +h '
            - ' +s '
            - ' +r '
            - '.aspx'
    selection_vsperfmon:
        - Image|contains: '\ProgramData\VSPerfMon\'
        - CommandLine|contains|all:
              - 'schtasks'
              - 'VSPerfMon'
    selection_opera_1:
        Image|endswith: 'Opera_browser.exe'
        ParentImage|endswith:
            - '\services.exe'
            - '\svchost.exe'
    selection_opera_2:
        Image|endswith: 'Users\Public\opera\Opera_browser.exe'
    selection_vssadmin:
        CommandLine|contains|all:
            - 'vssadmin list shadows'
            - 'Temp\__output'
    selection_makecab_1:
        Image|endswith: '\makecab.exe'
        CommandLine|contains|all:
            - 'inetpub\wwwroot\'
            - '.dmp.zip'
    selection_makecab_2:
        Image|endswith: '\makecab.exe'
        CommandLine|contains:
            - 'Microsoft\Exchange Server\'
            - 'compressionmemory'
            - '.gif'
    selection_7zip:
        CommandLine|contains|all:
            - ' -t7z '
            - 'C:\Programdata\pst'
            - '\it.zip'
    selection_rundll32:
        CommandLine|contains|all:
            - '\comsvcs.dll'
            - 'Minidump'
            - 'full '
            - '\inetpub\wwwroot'
    selection_other:
        CommandLine|contains:
            - 'Windows\Temp\xx.bat'
            - 'Windows\WwanSvcdcs'
            - 'Windows\Temp\cw.exe'
    condition: 1 of selection*