Sigma rule: Remote AppX Package Downloaded from File Sharing or CDN Domain

Rule

Title

Remote AppX Package Downloaded from File Sharing or CDN Domain

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-01-11

Modified

2026-03-29

File

rules/windows/builtin/appxdeployment_server/win_appxdeployment_server_appx_downloaded_from_file_sharing_domains.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects an appx package that was added to the pipeline of the "to be processed" packages which was downloaded from a file sharing or CDN domain.

Log source

product

windows

service

appxdeployment-server

Detection

selection:
    EventID: 854
    Path|contains:
        - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea)
        - '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'
        - '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'
condition: selection

False positives (as the rule lists them)

• Unlikely, unless the organization uses file sharing or CDN services to distribute internal applications.

Tags

• attack.stealth

Related rules

• d635249d-86b5-4dad-a8c7-d7272b788586 (similar)
• 52182dfb-afb7-41db-b4bc-5336cb29b464 (similar)
• ae02ed70-11aa-4a22-b397-c0d0e8f6ea99 (similar)
• e0f8ab85-0ac9-423b-a73a-81b3c7b1aa97 (similar)
• 7b434893-c57d-4f41-908d-6a17bf1ae98f (similar)
• 8518ed3d-f7c9-4601-a26c-f361a4256a0c (similar)
• 42a5f1e7-9603-4f6d-97ae-3f37d130d794 (similar)
• 56454143-524f-49fb-b1c6-3fb8b1ad41fb (similar)
• b6e04788-29e1-4557-bb14-77f761848ab8 (similar)
• a0d7e4d2-bede-4141-8896-bc6e237e977c (similar)
• 297ae038-edc2-4b2e-bb3e-7c5fc94dd5c7 (similar)

References

• https://www.sentinelone.com/labs/inside-malicious-windows-apps-for-malware-deployment/
• https://learn.microsoft.com/en-us/windows/win32/appxpkg/troubleshooting
• https://news.sophos.com/en-us/2021/11/11/bazarloader-call-me-back-attack-abuses-windows-10-apps-mechanism/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/appxdeployment_server/win_appxdeployment_server_appx_downloaded_from_file_sharing_domains.yml