1type: trigger
2name: sigmahq/proc_creation_win_susp_add_user_privileged_group
3description: |
4  Detects addition of users to highly privileged groups via "Net" or "Add-LocalGroupMember".
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.CommandLine contains 'localgroup ' && evt.Parsed.CommandLine contains ' /add' || evt.Parsed.CommandLine contains 'Add-LocalGroupMember ' && evt.Parsed.CommandLine contains ' -Group ') && (evt.Parsed.CommandLine contains 'Group Policy Creator Owners' || evt.Parsed.CommandLine contains 'Schema Admins'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1098
15
16  label: "User Added To Highly Privileged Group"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24