1type: trigger
2name: sigmahq/proc_creation_win_rundll32_no_params
3description: |
4  Detects suspicious start of rundll32.exe without any parameters as found in CobaltStrike beacon activity
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && ((evt.Parsed.CommandLine endsWith '\\rundll32.exe' || evt.Parsed.CommandLine endsWith '\\rundll32.exe"' || evt.Parsed.CommandLine endsWith '\\rundll32') && not (evt.Parsed.ParentImage contains '\\AppData\\Local\\' || evt.Parsed.ParentImage contains '\\Microsoft\\Edge\\'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1202
15
16  label: "Rundll32 Execution Without CommandLine Parameters"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24