{"id":"797011dc-44f4-4e6f-9f10-a8ceefbe566b","title":"WMI Backdoor Exchange Transport Agent","description":"Detects a WMI backdoor in Exchange Transport Agents via WMI event filters","author":"Florian Roth (Nextron Systems)","status":"test","level":"critical","date":"2019-10-11","modified":"2023-02-08","tags":["attack.privilege-escalation","attack.persistence","attack.t1546.003"],"technique_ids":["T1546.003"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://twitter.com/cglyer/status/1182389676876980224","https://twitter.com/cglyer/status/1182391019633029120"],"source_path":"rules/windows/process_creation/proc_creation_win_wmi_backdoor_exchange_transport_agent.yml","source_sha256":"cb1e1afc2dc6670a60ae34e10060d1b40552b2c4529e4f16b9d42d54cce54000","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_wmi_backdoor_exchange_transport_agent.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: WMI Backdoor Exchange Transport Agent\nid: 797011dc-44f4-4e6f-9f10-a8ceefbe566b\nstatus: test\ndescription: Detects a WMI backdoor in Exchange Transport Agents via WMI event filters\nreferences:\n    - https://twitter.com/cglyer/status/1182389676876980224\n    - https://twitter.com/cglyer/status/1182391019633029120\nauthor: Florian Roth (Nextron Systems)\ndate: 2019-10-11\nmodified: 2023-02-08\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.t1546.003\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith: '\\EdgeTransport.exe'\n    filter_conhost:\n        Image: 'C:\\Windows\\System32\\conhost.exe'\n    filter_oleconverter:  # FP also documented in https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=18\n        Image|startswith: 'C:\\Program Files\\Microsoft\\Exchange Server\\'\n        Image|endswith: '\\Bin\\OleConverter.exe'\n    condition: selection and not 1 of filter_*\nfalsepositives:\n    - Unknown\nlevel: critical\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1546.003","id":"T1546.003","name":"Windows Management Instrumentation Event Subscription","page":"techniques/enterprise/T1546.003/"}],"data_path":"data/detection-rules/797011dc-44f4-4e6f-9f10-a8ceefbe566b.json","kind":"sigma"}