{"id":"043c4b8b-3a54-4780-9682-081cb6b8185c","title":"Suspicious IIS Module Registration","description":"Detects a suspicious IIS module registration as described in Microsoft threat report on IIS backdoors","author":"Florian Roth (Nextron Systems), Microsoft (idea)","status":"test","level":"high","date":"2022-08-04","modified":"2023-01-23","tags":["attack.persistence","attack.t1505.004"],"technique_ids":["T1505.004"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Administrative activity"],"references":["https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/"],"source_path":"rules/windows/process_creation/proc_creation_win_iis_susp_module_registration.yml","source_sha256":"80d9ab61b3c1cb1c03ba741a77ac6e41600e95dc81405969ce4c683035ecf4d5","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_iis_susp_module_registration.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious IIS Module Registration\nid: 043c4b8b-3a54-4780-9682-081cb6b8185c\nstatus: test\ndescription: Detects a suspicious IIS module registration as described in Microsoft threat report on IIS backdoors\nreferences:\n    - https://www.microsoft.com/security/blog/2022/07/26/malicious-iis-extensions-quietly-open-persistent-backdoors-into-servers/\nauthor: Florian Roth (Nextron Systems), Microsoft (idea)\ndate: 2022-08-04\nmodified: 2023-01-23\ntags:\n    - attack.persistence\n    - attack.t1505.004\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_parent:\n        ParentImage|endswith: '\\w3wp.exe'\n    selection_cli_1:\n        CommandLine|contains: 'appcmd.exe add module'\n    selection_cli_2:\n        CommandLine|contains: ' system.enterpriseservices.internal.publish'\n        Image|endswith: '\\powershell.exe'\n    selection_cli_3:\n        CommandLine|contains|all:\n            - 'gacutil'\n            - ' /I'\n    condition: selection_parent and 1 of selection_cli_*\nfalsepositives:\n    - Administrative activity\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1505.004","id":"T1505.004","name":"IIS Components","page":"techniques/enterprise/T1505.004/"}],"data_path":"data/detection-rules/043c4b8b-3a54-4780-9682-081cb6b8185c.json","kind":"sigma"}