Detection rules › Sigma
User Added to Local Administrator Group
Detects the addition of a new member to the local administrator group, which could be legitimate activity or a sign of privilege escalation activity
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Initial Access | T1078 Valid Accounts |
| Persistence | T1078 Valid Accounts, T1098 Account Manipulation |
| Privilege Escalation | T1078 Valid Accounts, T1098 Account Manipulation |
| Defense Evasion | T1078 Valid Accounts |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Security-Auditing | 4732 | A member was added to a security-enabled local group. |
Stages and Predicates
Stage 1: all of selection_eid
Stage 2: all of selection_group
or:
TargetSid: S-1-5-32-544
TargetUserName|startswith: Administr
Stage 3: not 1 of filter_main_computer_accounts
SubjectUserName|endswith: '$'
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 |
|---|---|---|
SubjectUserName | ends_with |
|
TargetSid | eq |
|
TargetUserName | starts_with |
|
Neighbors
Stricter alternatives (narrower than this rule)
The rules below may be useful if you find the current rule is too noisy / lacks specificity.
- Windows DnsAdmins New Member Added (adds 2 filters)