{"id":"65744385-8541-44a6-8630-ffc824d7d4cc","title":"Microsoft Teams Sensitive File Access By Uncommon Applications","description":"Detects file access attempts to sensitive Microsoft teams files (leveldb, cookies) by an uncommon process.\n","author":"@SerkinValery","status":"test","level":"medium","date":"2024-07-22","modified":"","tags":["attack.credential-access","attack.t1528"],"technique_ids":["T1528"],"logsource":{"product":"windows","category":"file_access","definition":"Requirements: Microsoft-Windows-Kernel-File ETW provider"},"falsepositives":["Unknown"],"references":["https://www.bleepingcomputer.com/news/security/microsoft-teams-stores-auth-tokens-as-cleartext-in-windows-linux-macs/","https://www.vectra.ai/blog/undermining-microsoft-teams-security-by-mining-tokens"],"source_path":"rules/windows/file/file_access/file_access_win_teams_sensitive_files.yml","source_sha256":"89bfe2387bf442f87527f5bcb1e3e99fd3255ed7e05660658658ac26240d1831","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/file/file_access/file_access_win_teams_sensitive_files.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Microsoft Teams Sensitive File Access By Uncommon Applications\nid: 65744385-8541-44a6-8630-ffc824d7d4cc\nstatus: test\ndescription: |\n    Detects file access attempts to sensitive Microsoft teams files (leveldb, cookies) by an uncommon process.\nreferences:\n    - https://www.bleepingcomputer.com/news/security/microsoft-teams-stores-auth-tokens-as-cleartext-in-windows-linux-macs/\n    - https://www.vectra.ai/blog/undermining-microsoft-teams-security-by-mining-tokens\nauthor: '@SerkinValery'\ndate: 2024-07-22\ntags:\n    - attack.credential-access\n    - attack.t1528\nlogsource:\n    product: windows\n    category: file_access\n    definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider'\ndetection:\n    selection:\n        FileName|contains:\n            - '\\Microsoft\\Teams\\Cookies'\n            - '\\Microsoft\\Teams\\Local Storage\\leveldb'\n    filter_main_legit_location:\n        # Note: its best to filter the full path to avoid false negatives\n        Image|endswith: '\\Microsoft\\Teams\\current\\Teams.exe'\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/T1528","id":"T1528","name":"Steal Application Access Token","page":"techniques/enterprise/T1528/"}],"data_path":"data/detection-rules/65744385-8541-44a6-8630-ffc824d7d4cc.json","kind":"sigma"}