{"id":"0dba975d-a193-4ed1-a067-424df57570d1","title":"Uncommon Network Connection Initiated By Certutil.EXE","description":"Detects a network connection initiated by the certutil.exe utility.\nAttackers can abuse the utility in order to download malware or additional payloads.\n","author":"frack113, Florian Roth (Nextron Systems)","status":"test","level":"high","date":"2022-09-02","modified":"2024-05-31","tags":["attack.command-and-control","attack.t1105"],"technique_ids":["T1105"],"logsource":{"category":"network_connection","product":"windows"},"falsepositives":["Unknown"],"references":["https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil"],"source_path":"rules/windows/network_connection/net_connection_win_certutil_initiated_connection.yml","source_sha256":"2f3c61de042180cf7acc0f50483306fe869656a73dedfc0374f3e5f0a22df1bb","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/network_connection/net_connection_win_certutil_initiated_connection.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Uncommon Network Connection Initiated By Certutil.EXE\nid: 0dba975d-a193-4ed1-a067-424df57570d1\nstatus: test\ndescription: |\n    Detects a network connection initiated by the certutil.exe utility.\n    Attackers can abuse the utility in order to download malware or additional payloads.\nreferences:\n    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/certutil\nauthor: frack113, Florian Roth (Nextron Systems)\ndate: 2022-09-02\nmodified: 2024-05-31\ntags:\n    - attack.command-and-control\n    - attack.t1105\nlogsource:\n    category: network_connection\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\certutil.exe'\n        Initiated: 'true'\n        DestinationPort:\n            - 80\n            - 135\n            - 443\n            - 445\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1105","id":"T1105","name":"Ingress Tool Transfer","page":"techniques/enterprise/T1105/"}],"data_path":"data/detection-rules/0dba975d-a193-4ed1-a067-424df57570d1.json","kind":"sigma"}