{"id":"f57c58b3-ee69-4ef5-9041-455bf39aaa89","title":"Remote CHM File Download/Execution Via HH.EXE","description":"Detects the usage of \"hh.exe\" to execute/download remotely hosted \".chm\" files.","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2022-09-29","modified":"2024-01-31","tags":["attack.stealth","attack.t1218.001"],"technique_ids":["T1218.001"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.splunk.com/en_us/blog/security/follina-for-protocol-handlers.html","https://github.com/redcanaryco/atomic-red-team/blob/1cf4dd51f83dcb0ebe6ade902d6157ad2dbc6ac8/atomics/T1218.001/T1218.001.md","https://www.zscaler.com/blogs/security-research/unintentional-leak-glimpse-attack-vectors-apt37"],"source_path":"rules/windows/process_creation/proc_creation_win_hh_chm_remote_download_or_execution.yml","source_sha256":"776b14ebbb0d49971e0bb736bfec86b017f6d102e4b7c5f062387a3c529a4d71","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_hh_chm_remote_download_or_execution.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Remote CHM File Download/Execution Via HH.EXE\nid: f57c58b3-ee69-4ef5-9041-455bf39aaa89\nstatus: test\ndescription: Detects the usage of \"hh.exe\" to execute/download remotely hosted \".chm\" files.\nreferences:\n    - https://www.splunk.com/en_us/blog/security/follina-for-protocol-handlers.html\n    - https://github.com/redcanaryco/atomic-red-team/blob/1cf4dd51f83dcb0ebe6ade902d6157ad2dbc6ac8/atomics/T1218.001/T1218.001.md\n    - https://www.zscaler.com/blogs/security-research/unintentional-leak-glimpse-attack-vectors-apt37\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-09-29\nmodified: 2024-01-31\ntags:\n    - attack.stealth\n    - attack.t1218.001\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - OriginalFileName: 'HH.exe'\n        - Image|endswith: '\\hh.exe'\n    selection_cli:\n        CommandLine|contains:\n            - 'http://'\n            - 'https://'\n            - '\\\\\\\\'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218.001","id":"T1218.001","name":"Compiled HTML File","page":"techniques/enterprise/T1218.001/"}],"data_path":"data/detection-rules/f57c58b3-ee69-4ef5-9041-455bf39aaa89.json","kind":"sigma"}