Suspicious Rejected SMB Guest Logon From IP

calendar Apr 11, 2023 · attack.credential_access attack.t1110.001  ·
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Detect Attempt PrintNightmare (CVE-2021-1675) Remote code execution in Windows Spooler Service

Sigma rule (View on GitHub)

 1title: Suspicious Rejected SMB Guest Logon From IP
 2id: 71886b70-d7b4-4dbf-acce-87d2ca135262
 3status: test
 4description: Detect Attempt PrintNightmare (CVE-2021-1675) Remote code execution in Windows Spooler Service
 5references:
 6    - https://twitter.com/KevTheHermit/status/1410203844064301056
 7    - https://github.com/hhlxf/PrintNightmare
 8    - https://github.com/afwu/PrintNightmare
 9author: Florian Roth (Nextron Systems), KevTheHermit, fuzzyf10w
10date: 2021/06/30
11modified: 2023/01/02
12tags:
13    - attack.credential_access
14    - attack.t1110.001
15logsource:
16    product: windows
17    service: smbclient-security
18detection:
19    selection:
20        EventID: 31017
21        UserName: ''
22        ServerName|startswith: '\1'
23    condition: selection
24fields:
25    - Computer
26    - User
27falsepositives:
28    - Account fallback reasons (after failed login with specific account)
29level: medium

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