Remote AppX Package Downloaded from File Sharing or CDN Domain

calendar Dec 24, 2025 · attack.defense-evasion  ·
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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.

Sigma rule (View on GitHub)

 1title: Remote AppX Package Downloaded from File Sharing or CDN Domain
 2id: 8b48ad89-10d8-4382-a546-50588c410f0d
 3status: test
 4description: |
 5        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.
 6references:
 7    - https://www.sentinelone.com/labs/inside-malicious-windows-apps-for-malware-deployment/
 8    - https://learn.microsoft.com/en-us/windows/win32/appxpkg/troubleshooting
 9    - https://news.sophos.com/en-us/2021/11/11/bazarloader-call-me-back-attack-abuses-windows-10-apps-mechanism/
10author: Nasreddine Bencherchali (Nextron Systems)
11date: 2023-01-11
12modified: 2025-12-10
13tags:
14    - attack.defense-evasion
15logsource:
16    product: windows
17    service: appxdeployment-server
18detection:
19    selection:
20        EventID: 854
21        Path|contains:
22            - '.githubusercontent.com'       # Includes both gists and github repositories / Michael Haag (idea)
23            - 'anonfiles.com'
24            - 'cdn.discordapp.com'
25            - 'ddns.net'
26            - 'dl.dropboxusercontent.com'
27            - 'ghostbin.co'
28            - 'github.com'
29            - 'glitch.me'
30            - 'gofile.io'
31            - 'hastebin.com'
32            - 'mediafire.com'
33            - 'mega.nz'
34            - 'onrender.com'
35            - 'pages.dev'
36            - 'paste.ee'
37            - 'pastebin.com'
38            - 'pastebin.pl'
39            - 'pastetext.net'
40            - 'privatlab.com'
41            - 'privatlab.net'
42            - 'send.exploit.in'
43            - 'sendspace.com'
44            - 'storage.googleapis.com'
45            - 'storjshare.io'
46            - 'supabase.co'
47            - 'temp.sh'
48            - 'transfer.sh'
49            - 'trycloudflare.com'
50            - 'ufile.io'
51            - 'w3spaces.com'
52            - 'workers.dev'
53    condition: selection
54falsepositives:
55    - Unlikely, unless the organization uses file sharing or CDN services to distribute internal applications.
56level: high

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