1type: trigger
2name: sigmahq/proc_creation_win_sc_sdset_allow_service_changes
3description: |
4  Detects suspicious DACL modifications to allow access to a service from a suspicious trustee. This can be used to override access restrictions set by previous ACLs.
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.Image endsWith '\\sc.exe' || evt.Parsed.OriginalFileName == 'sc.exe') && evt.Parsed.CommandLine contains 'sdset' && evt.Parsed.CommandLine contains 'A;' && (evt.Parsed.CommandLine contains ';IU' || evt.Parsed.CommandLine contains ';SU' || evt.Parsed.CommandLine contains ';BA' || evt.Parsed.CommandLine contains ';SY' || evt.Parsed.CommandLine contains ';WD'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1543.003
15
16  label: "Allow Service Access Using Security Descriptor Tampering Via Sc.EXE"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24