User Couldn't Call a Privileged Service 'LsaRegisterLogonProcess'

calendar Oct 23, 2025 · attack.credential-access attack.lateral-movement attack.privilege-escalation attack.t1558.003  ·
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The 'LsaRegisterLogonProcess' function verifies that the application making the function call is a logon process by checking that it has the SeTcbPrivilege privilege set. Possible Rubeus tries to get a handle to LSA.

Sigma rule (View on GitHub)

 1title: User Couldn't Call a Privileged Service 'LsaRegisterLogonProcess'
 2id: 6daac7fc-77d1-449a-a71a-e6b4d59a0e54
 3status: test
 4description: The 'LsaRegisterLogonProcess' function verifies that the application making the function call is a logon process by checking that it has the SeTcbPrivilege privilege set. Possible Rubeus tries to get a handle to LSA.
 5references:
 6    - https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1
 7author: Roberto Rodriguez (source), Ilyas Ochkov (rule), oscd.community
 8date: 2019-10-24
 9modified: 2022-12-25
10tags:
11    - attack.credential-access
12    - attack.lateral-movement
13    - attack.privilege-escalation
14    - attack.t1558.003
15logsource:
16    product: windows
17    service: security
18detection:
19    selection:
20        EventID: 4673
21        Service: 'LsaRegisterLogonProcess()'
22        Keywords: '0x8010000000000000'     # failure
23    condition: selection
24falsepositives:
25    - Unknown
26level: high

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