Detection rules › Sigma
Potential Privilege Escalation via Local Kerberos Relay over LDAP
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.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1548 Abuse Elevation Control Mechanism |
| Defense Evasion | T1548 Abuse Elevation Control Mechanism |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Security-Auditing | 4624 | An account was successfully logged on. |
Stages and Predicates
Stage 1: selection
AuthenticationPackageName: Kerberos
IpAddress: 127.0.0.1
LogonType: 3
TargetUserSid|endswith: -500
TargetUserSid|startswith: S-1-5-21-
Stage 2: not 1 of filter_main_ip_null
IpPort: 0
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
AuthenticationPackageName | eq |
|
IpAddress | eq |
|
IpPort | eq |
|
LogonType | eq |
|
TargetUserSid | ends_with |
|
TargetUserSid | starts_with |
|
Neighbors
Broader alternatives (more inclusive than this rule)
These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.
- Potential Account Takeover - Mixed Logon Types (drops 5 filters this rule applies)
- Potential Account Takeover - Logon from New Source IP (drops 5 filters this rule applies)
- External Remote SMB Logon from Public IP (drops 4 filters this rule applies)