HAFNIUM Exchange Exploitation Activity

calendar Nov 28, 2023 · attack.persistence attack.t1546 attack.t1053 attack.g0125 detection.emerging_threats  ·
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Detects activity observed by different researchers to be HAFNIUM group activity (or related) on Exchange servers

Sigma rule (View on GitHub)

 1title: HAFNIUM Exchange Exploitation Activity
 2id: bbb2dedd-a0e3-46ab-ba6c-6c82ae7a9aa7
 3status: test
 4description: Detects activity observed by different researchers to be HAFNIUM group activity (or related) on Exchange servers
 5references:
 6    - https://blog.truesec.com/2021/03/07/exchange-zero-day-proxylogon-and-hafnium/
 7    - https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
 8    - https://discuss.elastic.co/t/detection-and-response-for-hafnium-activity/266289/3
 9    - https://twitter.com/GadixCRK/status/1369313704869834753?s=20
10    - https://twitter.com/BleepinComputer/status/1372218235949617161
11author: Florian Roth (Nextron Systems)
12date: 2021/03/09
13modified: 2023/03/09
14tags:
15    - attack.persistence
16    - attack.t1546
17    - attack.t1053
18    - attack.g0125
19    - detection.emerging_threats
20logsource:
21    category: process_creation
22    product: windows
23detection:
24    selection_attrib:
25        CommandLine|contains|all:
26            - 'attrib'
27            - ' +h '
28            - ' +s '
29            - ' +r '
30            - '.aspx'
31    selection_vsperfmon:
32        - Image|contains: '\ProgramData\VSPerfMon\'
33        - CommandLine|contains|all:
34              - 'schtasks'
35              - 'VSPerfMon'
36    selection_opera_1:
37        Image|endswith: 'Opera_browser.exe'
38        ParentImage|endswith:
39            - '\services.exe'
40            - '\svchost.exe'
41    selection_opera_2:
42        Image|endswith: 'Users\Public\opera\Opera_browser.exe'
43    selection_vssadmin:
44        CommandLine|contains|all:
45            - 'vssadmin list shadows'
46            - 'Temp\__output'
47    selection_makecab_1:
48        Image|endswith: '\makecab.exe'
49        CommandLine|contains|all:
50            - 'inetpub\wwwroot\'
51            - '.dmp.zip'
52    selection_makecab_2:
53        Image|endswith: '\makecab.exe'
54        CommandLine|contains:
55            - 'Microsoft\Exchange Server\'
56            - 'compressionmemory'
57            - '.gif'
58    selection_7zip:
59        CommandLine|contains|all:
60            - ' -t7z '
61            - 'C:\Programdata\pst'
62            - '\it.zip'
63    selection_rundll32:
64        CommandLine|contains|all:
65            - '\comsvcs.dll'
66            - 'Minidump'
67            - 'full '
68            - '\inetpub\wwwroot'
69    selection_other:
70        CommandLine|contains:
71            - 'Windows\Temp\xx.bat'
72            - 'Windows\WwanSvcdcs'
73            - 'Windows\Temp\cw.exe'
74    condition: 1 of selection*
75falsepositives:
76    - Unlikely
77level: critical

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