Sigma rule: Suspicious File Download From File Sharing Domain Via Curl.EXE

Rule

Title

Suspicious File Download From File Sharing Domain Via Curl.EXE

Status

test

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-05-05

Modified

2026-03-29

File

rules/windows/process_creation/proc_creation_win_curl_download_susp_file_sharing_domains.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potentially suspicious file download from file sharing domains using curl.exe

Log source

product

windows

category

process_creation

Detection

selection_img:
    - Image|endswith: '\curl.exe'
    - OriginalFileName: 'curl.exe'
selection_websites:
    CommandLine|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'
        - '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_http:
    CommandLine|contains: 'http'
selection_flag:
    CommandLine|contains:
        - ' -O'  # covers the alias for --remote-name and --output
        - '--remote-name'
        - '--output'
selection_ext:
    CommandLine|endswith:
        - ".ps1"
        - ".ps1'"
        - '.ps1"'
        - ".dat"
        - ".dat'"
        - '.dat"'
        - ".msi"
        - ".msi'"
        - '.msi"'
        - ".bat"
        - ".bat'"
        - '.bat"'
        - ".exe"
        - ".exe'"
        - '.exe"'
        - ".vbs"
        - ".vbs'"
        - '.vbs"'
        - ".vbe"
        - ".vbe'"
        - '.vbe"'
        - ".hta"
        - ".hta'"
        - '.hta"'
        - ".dll"
        - ".dll'"
        - '.dll"'
        - ".psm1"
        - ".psm1'"
        - '.psm1"'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.execution

Related rules

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• 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)
• b6e04788-29e1-4557-bb14-77f761848ab8 (similar)
• a0d7e4d2-bede-4141-8896-bc6e237e977c (similar)
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References

• https://labs.withsecure.com/publications/fin7-target-veeam-servers
• https://github.com/WithSecureLabs/iocs/blob/344203de742bb7e68bd56618f66d34be95a9f9fc/FIN7VEEAM/iocs.csv

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/process_creation/proc_creation_win_curl_download_susp_file_sharing_domains.yml