Potential Privilege Escalation via Local Kerberos Relay over LDAP

calendar Oct 23, 2025 · attack.defense-evasion attack.privilege-escalation attack.credential-access attack.t1548  ·
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Detects a suspicious local successful logon event where the Logon Package is Kerberos, the remote address is set to localhost, and the target user SID is the built-in local Administrator account. This may indicate an attempt to leverage a Kerberos relay attack variant that can be used to elevate privilege locally from a domain joined limited user to local System privileges.

Sigma rule (View on GitHub)

 1title: Potential Privilege Escalation via Local Kerberos Relay over LDAP
 2id: 749c9f5e-b353-4b90-a9c1-05243357ca4b
 3status: test
 4description: |
 5    Detects a suspicious local successful logon event where the Logon Package is Kerberos, the remote address is set to localhost, and the target user SID is the built-in local Administrator account.
 6    This may indicate an attempt to leverage a Kerberos relay attack variant that can be used to elevate privilege locally from a domain joined limited user to local System privileges.    
 7references:
 8    - https://twitter.com/sbousseaden/status/1518976397364056071?s=12&t=qKO5eKHvWhAP19a50FTZ7g
 9    - https://github.com/elastic/detection-rules/blob/5fe7833312031a4787e07893e27e4ea7a7665745/rules/_deprecated/privilege_escalation_krbrelayup_suspicious_logon.toml#L38
10author: Elastic, @SBousseaden
11date: 2022-04-27
12modified: 2024-08-13
13tags:
14    - attack.defense-evasion
15    - attack.privilege-escalation
16    - attack.credential-access
17    - attack.t1548
18logsource:
19    product: windows
20    service: security
21detection:
22    selection:
23        EventID: 4624
24        LogonType: 3
25        AuthenticationPackageName: 'Kerberos'
26        IpAddress: '127.0.0.1'
27        TargetUserSid|startswith: 'S-1-5-21-'
28        TargetUserSid|endswith: '-500'
29    filter_main_ip_null:
30        IpPort: '0'
31    condition: selection and not 1 of filter_main_*
32falsepositives:
33    - Unknown
34level: high

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