1type: trigger
2name: sigmahq/proc_creation_win_susp_child_process_as_system_
3description: |
4  Detection of child processes spawned with SYSTEM privileges by parents with LOCAL SERVICE or NETWORK SERVICE accounts
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.ParentUser contains 'AUTHORI' || evt.Parsed.ParentUser contains 'AUTORI') && (evt.Parsed.ParentUser endsWith '\\NETWORK SERVICE' || evt.Parsed.ParentUser endsWith '\\LOCAL SERVICE') && (evt.Parsed.User contains 'AUTHORI' || evt.Parsed.User contains 'AUTORI') && (evt.Parsed.User endsWith '\\SYSTEM' || evt.Parsed.User endsWith '\\Système' || evt.Parsed.User endsWith '\\СИСТЕМА') && evt.Parsed.IntegrityLevel == 'System' && not (evt.Parsed.Image endsWith '\\rundll32.exe' && evt.Parsed.CommandLine contains 'DavSetCookie'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1134.002
15
16  label: "Suspicious Child Process Created as System"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24