{"id":"180c7c5c-d64b-4a63-86e9-68910451bc8b","title":"Potential File Download Via MS-AppInstaller Protocol Handler","description":"Detects usage of the \"ms-appinstaller\" protocol handler via command line to potentially download arbitrary files via AppInstaller.EXE\nThe downloaded files are temporarly stored in \":\\Users\\%username%\\AppData\\Local\\Packages\\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\\AC\\INetCache\\<RANDOM-8-CHAR-DIRECTORY>\"\n","author":"Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel","status":"test","level":"medium","date":"2023-11-09","modified":"","tags":["attack.execution","attack.stealth","attack.t1218"],"technique_ids":["T1218"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://lolbas-project.github.io/lolbas/Binaries/AppInstaller/"],"source_path":"rules/windows/process_creation/proc_creation_win_susp_ms_appinstaller_download.yml","source_sha256":"a8bcf42c4d424979a71e856b69d04606ff24306c33edda01c350b1f41448ecd4","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_susp_ms_appinstaller_download.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potential File Download Via MS-AppInstaller Protocol Handler\nid: 180c7c5c-d64b-4a63-86e9-68910451bc8b\nrelated:\n    - id: 7cff77e1-9663-46a3-8260-17f2e1aa9d0a\n      type: derived\nstatus: test\ndescription: |\n    Detects usage of the \"ms-appinstaller\" protocol handler via command line to potentially download arbitrary files via AppInstaller.EXE\n    The downloaded files are temporarly stored in \":\\Users\\%username%\\AppData\\Local\\Packages\\Microsoft.DesktopAppInstaller_8wekyb3d8bbwe\\AC\\INetCache\\<RANDOM-8-CHAR-DIRECTORY>\"\nreferences:\n    - https://lolbas-project.github.io/lolbas/Binaries/AppInstaller/\nauthor: Nasreddine Bencherchali (Nextron Systems), Swachchhanda Shrawan Poudel\ndate: 2023-11-09\ntags:\n    - attack.execution\n    - attack.stealth\n    - attack.t1218\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        CommandLine|contains|all:\n            - 'ms-appinstaller://?source='\n            - 'http'\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218","id":"T1218","name":"System Binary Proxy Execution","page":"techniques/enterprise/T1218/"}],"data_path":"data/detection-rules/180c7c5c-d64b-4a63-86e9-68910451bc8b.json","kind":"sigma"}