HAFNIUM Exchange Exploitation Activity

title: HAFNIUM Exchange Exploitation Activity
id: bbb2dedd-a0e3-46ab-ba6c-6c82ae7a9aa7
status: test
description: Detects activity observed by different researchers to be HAFNIUM group activity (or related) on Exchange servers
references:
    - https://blog.truesec.com/2021/03/07/exchange-zero-day-proxylogon-and-hafnium/
    - https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
    - https://discuss.elastic.co/t/detection-and-response-for-hafnium-activity/266289/3
    - https://twitter.com/GadixCRK/status/1369313704869834753?s=20
    - https://twitter.com/BleepinComputer/status/1372218235949617161
author: Florian Roth (Nextron Systems)
date: 2021-03-09
modified: 2023-03-09
tags:
    - attack.privilege-escalation
    - attack.execution
    - attack.persistence
    - attack.t1546
    - attack.t1053
    - attack.g0125
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
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*
falsepositives:
    - Unlikely
level: critical