1type: trigger
2name: sigmahq/proc_creation_win_powershell_import_cert_susp_locations
3description: |
4  Adversaries may install a root certificate on a compromised system to avoid warnings when connecting to adversary controlled web servers.
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine contains 'Import-Certificate' && evt.Parsed.CommandLine contains ' -FilePath ' && evt.Parsed.CommandLine contains 'Cert:\\LocalMachine\\Root' && (evt.Parsed.CommandLine contains '\\AppData\\Local\\Temp\\' || evt.Parsed.CommandLine contains ':\\Windows\\TEMP\\' || evt.Parsed.CommandLine contains '\\Desktop\\' || evt.Parsed.CommandLine contains '\\Downloads\\' || evt.Parsed.CommandLine contains '\\Perflogs\\' || evt.Parsed.CommandLine contains ':\\Users\\Public\\'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1553.004
15
16  label: "Root Certificate Installed From Susp Locations"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24