Win Susp Computer Name Containing Samtheadmin

calendar Jun 4, 2025 · cve.2021-42278 cve.2021-42287 attack.persistence attack.privilege-escalation attack.t1078  ·
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Detects suspicious computer name samtheadmin-{1..100}$ generated by hacktool

Sigma rule (View on GitHub)

 1title: Win Susp Computer Name Containing Samtheadmin
 2id: 39698b3f-da92-4bc6-bfb5-645a98386e45
 3status: test
 4description: Detects suspicious computer name samtheadmin-{1..100}$ generated by hacktool
 5references:
 6    - https://twitter.com/malmoeb/status/1511760068743766026
 7    - https://github.com/helloexp/0day/blob/614227a7b9beb0e91e7e2c6a5e532e6f7a8e883c/00-CVE_EXP/CVE-2021-42287/sam-the-admin/sam_the_admin.py
 8author: elhoim
 9date: 2022-09-09
10modified: 2023-01-04
11tags:
12    - cve.2021-42278
13    - cve.2021-42287
14    - attack.persistence
15    - attack.privilege-escalation
16    - attack.t1078
17logsource:
18    service: security
19    product: windows
20detection:
21    # Not adding an EventID on purpose to try to match on any event in security (including use of account), not just 4741 (computer account created)
22    selection1:
23        SamAccountName|startswith: 'SAMTHEADMIN-'
24        SamAccountName|endswith: '$'
25    selection2:
26        TargetUserName|startswith: 'SAMTHEADMIN-'
27        TargetUserName|endswith: '$'
28    condition: 1 of selection*
29fields:
30    - EventID
31    - SamAccountName
32    - SubjectUserName
33    - TargetUserName
34falsepositives:
35    - Unknown
36level: critical

References

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