{"id":"0531e43a-d77d-47c2-b89f-5fe50321c805","title":"RegAsm.EXE Initiating Network Connection To Public IP","description":"Detects \"RegAsm.exe\" initiating a network connection to public IP adresses","author":"frack113","status":"test","level":"medium","date":"2024-04-25","modified":"","tags":["attack.stealth","attack.t1218.009"],"technique_ids":["T1218.009"],"logsource":{"category":"network_connection","product":"windows"},"falsepositives":["Unknown"],"references":["https://app.any.run/tasks/ec207948-4916-47eb-a0f4-4c6abb2e7668/","https://research.splunk.com/endpoint/07921114-6db4-4e2e-ae58-3ea8a52ae93f/","https://lolbas-project.github.io/lolbas/Binaries/Regasm/"],"source_path":"rules/windows/network_connection/net_connection_win_regasm_network_activity.yml","source_sha256":"b14d03605e62155b97fa7e36ca22ab8e97c86637e8063d00bac65cf0f4d2e875","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/network_connection/net_connection_win_regasm_network_activity.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: RegAsm.EXE Initiating Network Connection To Public IP\nid: 0531e43a-d77d-47c2-b89f-5fe50321c805\nstatus: test\ndescription: Detects \"RegAsm.exe\" initiating a network connection to public IP adresses\nreferences:\n    - https://app.any.run/tasks/ec207948-4916-47eb-a0f4-4c6abb2e7668/\n    - https://research.splunk.com/endpoint/07921114-6db4-4e2e-ae58-3ea8a52ae93f/\n    - https://lolbas-project.github.io/lolbas/Binaries/Regasm/\nauthor: frack113\ndate: 2024-04-25\ntags:\n    - attack.stealth\n    - attack.t1218.009\nlogsource:\n    category: network_connection\n    product: windows\ndetection:\n    selection:\n        Initiated: 'true'\n        Image|endswith: '\\regasm.exe'\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    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.009","id":"T1218.009","name":"Regsvcs/Regasm","page":"techniques/enterprise/T1218.009/"}],"data_path":"data/detection-rules/0531e43a-d77d-47c2-b89f-5fe50321c805.json","kind":"sigma"}