1type: trigger
2name: sigmahq/proc_creation_win_iis_susp_module_registration
3description: |
4  Detects a suspicious IIS module registration as described in Microsoft threat report on IIS backdoors
5filter: |
6  (evt.Meta.service == 'sysmon' && evt.Parsed.EventID == '1') && (evt.Parsed.ParentImage endsWith '\\w3wp.exe' && (evt.Parsed.CommandLine contains 'appcmd.exe add module' || evt.Parsed.CommandLine contains ' system.enterpriseservices.internal.publish' && evt.Parsed.Image endsWith '\\powershell.exe' || evt.Parsed.CommandLine contains 'gacutil' && evt.Parsed.CommandLine contains ' /I'))
7blackhole: 2m
8#status: test
9labels:
10  service: windows
11  confidence: 1
12  spoofable: 0
13  classification:
14   - attack.t1505.004
15
16  label: "Suspicious IIS Module Registration"
17  behavior : "windows:audit"
18  remediation: false
19
20scope:
21  type: ParentProcessId
22  expression: evt.Parsed.ParentProcessId
23
24