User Couldn't Call a Privileged Service 'LsaRegisterLogonProcess'

Status: test
Severity: high
Log source: product windows, service security
Author: Roberto Rodriguez (source), Ilyas Ochkov (rule), oscd.community
Source: github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

Tactic	Techniques
Credential Access	`T1558.003` Steal or Forge Kerberos Tickets: Kerberoasting

Telemetry coverage

Provider	Record / event type
Security-Auditing	Event ID 4673: A privileged service was called.

Rule body

title: User Couldn't Call a Privileged Service 'LsaRegisterLogonProcess'
id: 6daac7fc-77d1-449a-a71a-e6b4d59a0e54
status: test
description: 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.
references:
    - https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1
author: Roberto Rodriguez (source), Ilyas Ochkov (rule), oscd.community
date: 2019-10-24
modified: 2022-12-25
tags:
    - attack.credential-access
    - attack.lateral-movement
    - attack.privilege-escalation
    - attack.t1558.003
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 4673
        Service: 'LsaRegisterLogonProcess()'
        Keywords: '0x8010000000000000'     # failure
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    EventID: 4673
    Service: 'LsaRegisterLogonProcess()'
    Keywords: '0x8010000000000000'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Keywords`	eq	`0x8010000000000000`	`field:"Keywords" kind:eq value:"0x8010000000000000"`
`Service`	eq	`LsaRegisterLogonProcess()`	`field:"Service" kind:eq value:"LsaRegisterLogonProcess()"`