1type: trigger
2name: sigmahq/proc_creation_win_powershell_frombase64string
3description: |
4  Detects usage of the "FromBase64String" function in the commandline which is used to decode a base64 encoded string
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine contains '::FromBase64String(')
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1027
15   - attack.t1140
16   - attack.t1059.001
17
18  label: "Base64 Encoded PowerShell Command Detected"
19  behavior : "windows:audit"
20  remediation: false
21
22scope:
23  type: ParentProcessId
24  expression: evt.Parsed.ParentProcessId
25
26