{"id":"56fda488-113e-4ce9-8076-afc2457922c3","title":"Possible DCSync Attack","description":"Detects remote RPC calls to MS-DRSR from non DC hosts, which could indicate DCSync / DCShadow attacks.","author":"Sagie Dulce, Dekel Paz","status":"test","level":"high","date":"2022-01-01","modified":"","tags":["attack.t1033","attack.discovery"],"technique_ids":["T1033"],"logsource":{"product":"rpc_firewall","category":"application","definition":"Requirements: install and apply the RPC Firewall to all processes, enable DRSR UUID (e3514235-4b06-11d1-ab04-00c04fc2dcd2) for \"dangerous\" opcodes (not 0,1 or 12) only from trusted IPs (DCs)"},"falsepositives":["Unknown"],"references":["https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-drsr/f977faaa-673e-4f66-b9bf-48c640241d47?redirectedfrom=MSDN","https://github.com/jsecurity101/MSRPC-to-ATTACK/blob/ddd4608fe8684fcf2fcf9b48c5f0b3c28097f8a3/documents/MS-DRSR.md","https://github.com/zeronetworks/rpcfirewall","https://zeronetworks.com/blog/stopping-lateral-movement-via-the-rpc-firewall/"],"source_path":"rules/application/rpc_firewall/rpc_firewall_dcsync_attack.yml","source_sha256":"3a428d554d0ac8a49a5dcf997b9a44c428a174850ca8ffe4afc7f63adddc1a56","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/application/rpc_firewall/rpc_firewall_dcsync_attack.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Possible DCSync Attack\nid: 56fda488-113e-4ce9-8076-afc2457922c3\nstatus: test\ndescription: Detects remote RPC calls to MS-DRSR from non DC hosts, which could indicate DCSync / DCShadow attacks.\nreferences:\n    - https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-drsr/f977faaa-673e-4f66-b9bf-48c640241d47?redirectedfrom=MSDN\n    - https://github.com/jsecurity101/MSRPC-to-ATTACK/blob/ddd4608fe8684fcf2fcf9b48c5f0b3c28097f8a3/documents/MS-DRSR.md\n    - https://github.com/zeronetworks/rpcfirewall\n    - https://zeronetworks.com/blog/stopping-lateral-movement-via-the-rpc-firewall/\nauthor: Sagie Dulce, Dekel Paz\ndate: 2022-01-01\ntags:\n    - attack.t1033\n    - attack.discovery\nlogsource:\n    product: rpc_firewall\n    category: application\n    definition: 'Requirements: install and apply the RPC Firewall to all processes, enable DRSR UUID (e3514235-4b06-11d1-ab04-00c04fc2dcd2) for \"dangerous\" opcodes (not 0,1 or 12) only from trusted IPs (DCs)'\ndetection:\n    selection:\n        EventLog: RPCFW\n        EventID: 3\n        InterfaceUuid: e3514235-4b06-11d1-ab04-00c04fc2dcd2\n    filter:\n        OpNum:\n            - 0\n            - 1\n            - 12\n    condition: selection and not filter\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1033","id":"T1033","name":"System Owner/User Discovery","page":"techniques/enterprise/T1033/"}],"data_path":"data/detection-rules/56fda488-113e-4ce9-8076-afc2457922c3.json","kind":"sigma"}