Detection rules › Sigma
Suspicious Child Process Created as System
Detection of child processes spawned with SYSTEM privileges by parents with LOCAL SERVICE or NETWORK SERVICE accounts
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | T1134.002 Access Token Manipulation: Create Process with Token |
| Defense Evasion | T1134.002 Access Token Manipulation: Create Process with Token |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 1 | Process creation |
Stages and Predicates
Stage 1: selection
IntegrityLevel: [S-1-16-16384, System]
or:
ParentUser|endswith: '\LOCAL SERVICE'
ParentUser|endswith: '\NETWORK SERVICE'
or:
ParentUser|contains: AUTHORI
ParentUser|contains: AUTORI
or:
User|endswith: '\SYSTEM'
User|endswith: '\Système'
User|endswith: '\СИСТЕМА'
or:
User|contains: AUTHORI
User|contains: AUTORI
Stage 2: not 1 of filter_rundll32
CommandLine|contains: DavSetCookie
Image|endswith: '\rundll32.exe'
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 |
|---|---|---|
CommandLine | match |
|
Image | ends_with |
|
IntegrityLevel | eq |
|
ParentUser | ends_with |
|
ParentUser | match |
|
User | ends_with |
|
User | match |
|
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.
- Suspicious SYSTEM User Process Creation (drops 3 filters this rule applies)