{"id":"68b8547b-107f-43f3-97fb-900a7d63c190","title":"OpenCanary - NMAP NULL Scan","description":"Detects instances where an OpenCanary node has been targeted by a NMAP NULL Scan","author":"Marco Pedrinazzi (@pedrinazziM)","status":"experimental","level":"high","date":"2026-01-06","modified":"","tags":["attack.discovery","attack.t1046"],"technique_ids":["T1046"],"logsource":{"category":"application","product":"opencanary"},"falsepositives":["Unlikely"],"references":["https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration","https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52"],"source_path":"rules/application/opencanary/opencanary_portscan_nmap_null_scan.yml","source_sha256":"66eb6ffb7452e9dccff21a2703d04c28387c2076f96598e1604195ef78bf2e4b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/application/opencanary/opencanary_portscan_nmap_null_scan.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: OpenCanary - NMAP NULL Scan\nid: 68b8547b-107f-43f3-97fb-900a7d63c190\nstatus: experimental\ndescription: Detects instances where an OpenCanary node has been targeted by a NMAP NULL Scan\nreferences:\n    - https://opencanary.readthedocs.io/en/latest/starting/configuration.html#services-configuration\n    - https://github.com/thinkst/opencanary/blob/a0896adfcaf0328cfd5829fe10d2878c7445138e/opencanary/logger.py#L52\nauthor: Marco Pedrinazzi (@pedrinazziM)\ndate: 2026-01-06\ntags:\n    - attack.discovery\n    - attack.t1046\nlogsource:\n    category: application\n    product: opencanary\ndetection:\n    selection:\n        logtype: 5003\n    condition: selection\nfalsepositives:\n    - Unlikely\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1046","id":"T1046","name":"Network Service Discovery","page":"techniques/enterprise/T1046/"}],"data_path":"data/detection-rules/68b8547b-107f-43f3-97fb-900a7d63c190.json","kind":"sigma"}