1type: trigger
2name: sigmahq/proc_creation_win_hktl_invoke_obfuscation_var
3description: |
4  Detects Obfuscated use of Environment Variables to execute PowerShell
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.CommandLine matches 'cmd.{0,5}(?:/c|/r)(?:\\s|)\\"set\\s[a-zA-Z]{3,6}.*(?:\\{\\d\\}){1,}\\\\\\"\\s+?\\-f(?:.*\\)){1,}.*\\"')
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1027
15   - attack.t1059.001
16
17  label: "Invoke-Obfuscation VAR+ Launcher"
18  behavior : "windows:audit"
19  remediation: false
20
21scope:
22  type: ParentProcessId
23  expression: evt.Parsed.ParentProcessId
24
25