Query: Sigma YAML for windows / create_stream_hash
Matching passage: Sigma rule: Detects the download of suspicious file type from a well-known file and paste sharing domain. Logsource: windows / create_stream_hash. Rule: title: Unusual File Download From File Sharing Websites - File Stream id: ae02ed70-11aa-4a22-b397-c0d0e8f6ea99 related: - id: 8b48ad89-10d8-4382-a546-50588c410f0d type: similar - id: d635249d-86b5-4dad-a8c7-d7272b788586 type: similar - id: 52182dfb-afb7-41db-b4bc-5336cb29b464 type: similar - id: e0f8ab85-0ac9-423b-a73a-81b3c7b1aa97 type: similar - id: 7b434893-c57d-4f41-908d-6a17bf1ae98f type: similar - id: 8518ed3d-f7c9-4601-a26c-f361a4256a0c type: similar - id: 42a5f1e7-9603-4f6d-97ae-3f37d130d794 type: similar - id: 56454143-524f-49fb-b1c6-3fb8b1ad41fb type: similar - id: b6e04788-29e1-4557-bb14-77f761848ab8 type: similar - id: a0d7e4d2-bede-4141-8896-bc6e237e977c type: similar - id: 297ae038-edc2-4b2e-bb3e-7c5fc94dd5c7 type: similar status: test description: Detects the download of suspicious file type from a well-known file and paste sharing domain references: - https://www.ultimatewindowssecurity.com/securitylog/encyclopedia/event.aspx?eventid=90015 - https://www.cisa.gov/uscert/ncas/alerts/aa22-321a - https://www.microsoft.com/en-us/security/blog/2024/01/17/new-ttps-observed-in-mint-sandstorm-campaign-targeting-high-profile-individuals-at-universities-and-research-orgs/ author: Florian Roth (Nextron Systems) date: 2022-08-24 modified: 2026-03-29 tags: - attack.stealth - attack.s0139 - attack.t1564.004 logsource: product: windows category: create_stream_hash detection: selection_domain: Contents|contains: - .githubusercontent.com - 0x0.st - anonfiles.com - bashupload.com - cdn.discordapp.com - chunk.io - ddns.net - dl.dropboxusercontent.com - ghostbin.co - github.com - glitch.me - gofile.io - hastebin.com - mediafire.com - mega.nz - onrender.com - pages.dev - paste.ee - pastebin.com - pastebin.pl - pastetext.net - pixeldrain.com - privatlab.com - privatlab.net - send.exploit.in - sendspace.com - storage.googleapis.com - storjshare.io - supabase.co - temp.sh - transfer.sh - trycloudflare.com - ufile.io - w3spaces.com - workers.dev - x0.at selection_extension: TargetFilename|contains: - .bat:Zone - .cmd:Zone - .ps1:Zone condition: all of selection_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects the creation of a new Outlook form which can contain malicious code. Logsource: windows / file_event. Rule: title: Potential Persistence Via Outlook Form id: c3edc6a5-d9d4-48d8-930e-aab518390917 status: test description: Detects the creation of a new Outlook form which can contain malicious code references: - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=76 - https://speakerdeck.com/heirhabarov/hunting-for-persistence-via-microsoft-exchange-server-or-outlook?slide=79 - https://learn.microsoft.com/en-us/office/vba/outlook/concepts/outlook-forms/create-an-outlook-form - https://www.slipstick.com/developer/custom-form/clean-outlooks-forms-cache/ author: Tobias Michalski (Nextron Systems) date: 2021-06-10 modified: 2023-02-22 tags: - attack.persistence - attack.t1137.003 logsource: product: windows category: file_event detection: selection: Image|endswith: \outlook.exe TargetFilename|contains: - \AppData\Local\Microsoft\FORMS\IPM - \Local Settings\Application Data\Microsoft\Forms condition: selection falsepositives: - Legitimate use of outlook forms level: high