Suspicious File Download From File Sharing Domain Via Curl.EXE

title: Suspicious File Download From File Sharing Domain Via Curl.EXE
id: 56454143-524f-49fb-b1c6-3fb8b1ad41fb
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: ae02ed70-11aa-4a22-b397-c0d0e8f6ea99
      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: 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 potentially suspicious file download from file sharing domains using curl.exe
references:
    - https://labs.withsecure.com/publications/fin7-target-veeam-servers
    - https://github.com/WithSecureLabs/iocs/blob/344203de742bb7e68bd56618f66d34be95a9f9fc/FIN7VEEAM/iocs.csv
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-05
modified: 2026-03-29
tags:
    - attack.execution
logsource:
    category: process_creation
    product: windows
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_*
falsepositives:
    - Unknown
level: high
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_download_susp_file_sharing_domains/info.yml