{"id":"00d49ed5-4491-4271-a8db-650a4ef6f8c1","title":"Suspicious Download from Office Domain","description":"Detects suspicious ways to download files from Microsoft domains that are used to store attachments in Emails or OneNote documents","author":"Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2021-12-27","modified":"2022-08-02","tags":["attack.command-and-control","attack.resource-development","attack.t1105","attack.t1608"],"technique_ids":["T1105","T1608"],"logsource":{"product":"windows","category":"process_creation"},"falsepositives":["Scripts or tools that download attachments from these domains (OneNote, Outlook 365)"],"references":["https://twitter.com/an0n_r0/status/1474698356635193346?s=12","https://twitter.com/mrd0x/status/1475085452784844803?s=12"],"source_path":"rules/windows/process_creation/proc_creation_win_susp_download_office_domain.yml","source_sha256":"b78f4b2aadea0e2ca64d72296b17751940edfed3b0b4e562743b8dc05ba63c34","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_susp_download_office_domain.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Download from Office Domain\nid: 00d49ed5-4491-4271-a8db-650a4ef6f8c1\nstatus: test\ndescription: Detects suspicious ways to download files from Microsoft domains that are used to store attachments in Emails or OneNote documents\nreferences:\n    - https://twitter.com/an0n_r0/status/1474698356635193346?s=12\n    - https://twitter.com/mrd0x/status/1475085452784844803?s=12\nauthor: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)\ndate: 2021-12-27\nmodified: 2022-08-02\ntags:\n    - attack.command-and-control\n    - attack.resource-development\n    - attack.t1105\n    - attack.t1608\nlogsource:\n    product: windows\n    category: process_creation\ndetection:\n    selection_download:\n        - Image|endswith:\n              - '\\curl.exe'\n              - '\\wget.exe'\n        - CommandLine|contains:\n              - 'Invoke-WebRequest'\n              - 'iwr '\n              - 'curl '\n              - 'wget '\n              - 'Start-BitsTransfer'\n              - '.DownloadFile('\n              - '.DownloadString('\n    selection_domains:\n        CommandLine|contains:\n            - 'https://attachment.outlook.live.net/owa/'\n            - 'https://onenoteonlinesync.onenote.com/onenoteonlinesync/'\n    condition: all of selection_*\nfalsepositives:\n    - Scripts or tools that download attachments from these domains (OneNote, Outlook 365)\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/"},{"key":"enterprise/T1608","id":"T1608","name":"Stage Capabilities","page":"techniques/enterprise/T1608/"}],"data_path":"data/detection-rules/00d49ed5-4491-4271-a8db-650a4ef6f8c1.json","kind":"sigma"}