Detection rules › Elastic
Active Directory Group Modification by SYSTEM
Identifies a user being added to an active directory group by the SYSTEM (S-1-5-18) user. This behavior can indicate that the attacker has achieved SYSTEM privileges in a domain controller, which attackers can obtain by exploiting vulnerabilities or abusing default group privileges (e.g., Server Operators), and is attempting to pivot to a domain account.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1098 Account Manipulation |
| Privilege Escalation | T1098 Account Manipulation |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Security-Auditing | 4728 | A member was added to a security-enabled global group. |
Stages and Predicates
Stage 1: eql:iam
not group.id:"S-1-5-21-*-513" and winlog.event_data.SubjectUserSid:"S-1-5-18"Exclusions
Top-level NOT(...) conjuncts — predicates this rule actively suppresses.
| Stage | Field | Kind | Excluded values |
|---|---|---|---|
| 1 | group.id | wildcard | S-1-5-21-*-513 |
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 |
|---|---|---|
winlog.event_data.SubjectUserSid | wildcard |
|