{"id":"7610a4ea-c06d-495f-a2ac-0a696abcfd3b","title":"Outbound Network Connection To Public IP Via Winlogon","description":"Detects a \"winlogon.exe\" process that initiate network communications with public IP addresses","author":"Christopher Peacock @securepeacock, SCYTHE @scythe_io","status":"test","level":"medium","date":"2023-04-28","modified":"2024-03-12","tags":["attack.execution","attack.command-and-control","attack.stealth","attack.t1218.011"],"technique_ids":["T1218.011"],"logsource":{"category":"network_connection","product":"windows"},"falsepositives":["Communication to other corporate systems that use IP addresses from public address spaces"],"references":["https://www.microsoft.com/en-us/security/blog/2023/04/11/guidance-for-investigating-attacks-using-cve-2022-21894-the-blacklotus-campaign/"],"source_path":"rules/windows/network_connection/net_connection_win_winlogon_net_connections.yml","source_sha256":"249c59705e2234fb32529d913dbeee4d26eba33d6d3f5cb1c392e0ef461f04e4","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/network_connection/net_connection_win_winlogon_net_connections.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Outbound Network Connection To Public IP Via Winlogon\nid: 7610a4ea-c06d-495f-a2ac-0a696abcfd3b\nstatus: test\ndescription: Detects a \"winlogon.exe\" process that initiate network communications with public IP addresses\nreferences:\n    - https://www.microsoft.com/en-us/security/blog/2023/04/11/guidance-for-investigating-attacks-using-cve-2022-21894-the-blacklotus-campaign/\nauthor: Christopher Peacock @securepeacock, SCYTHE @scythe_io\ndate: 2023-04-28\nmodified: 2024-03-12\ntags:\n    - attack.execution\n    - attack.command-and-control\n    - attack.stealth\n    - attack.t1218.011\nlogsource:\n    category: network_connection\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\winlogon.exe'\n        Initiated: 'true'\n    filter_main_local_ranges:\n        DestinationIp|cidr:\n            - '127.0.0.0/8'\n            - '10.0.0.0/8'\n            - '172.16.0.0/12'\n            - '192.168.0.0/16'\n            - '169.254.0.0/16'\n            - '::1/128'  # IPv6 loopback\n            - 'fe80::/10'  # IPv6 link-local addresses\n            - 'fc00::/7'  # IPv6 private addresses\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Communication to other corporate systems that use IP addresses from public address spaces\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.011","id":"T1218.011","name":"Rundll32","page":"techniques/enterprise/T1218.011/"}],"data_path":"data/detection-rules/7610a4ea-c06d-495f-a2ac-0a696abcfd3b.json","kind":"sigma"}