File Download From IP URL Via Curl.EXE

title: File Download From IP URL Via Curl.EXE
id: 9cc85849-3b02-4cb5-b371-3a1ff54f2218
related:
    - id: 5cb299fc-5fb1-4d07-b989-0644c68b6043
      type: similar
status: test
description: Detects file downloads directly from IP address URL using curl.exe
references:
    - https://labs.withsecure.com/publications/fin7-target-veeam-servers
    - https://github.com/WithSecureLabs/iocs/blob/344203de742bb7e68bd56618f66d34be95a9f9fc/FIN7VEEAM/iocs.csv
    - https://github.com/pr0xylife/IcedID/blob/8dd1e218460db4f750d955b4c65b2f918a1db906/icedID_09.28.2023.txt
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-10-18
tags:
    - attack.execution
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\curl.exe'
        - OriginalFileName: 'curl.exe'
    selection_ip:
        CommandLine|re: '://[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
    selection_http:
        CommandLine|contains: 'http'
    selection_flag:
        CommandLine|contains:
            - ' -O'  # covers the alias for --remote-name and --output
            - '--remote-name'
            - '--output'
    filter_main_ext:
        # Note: This filter exists to avoid duplication with 5cb299fc-5fb1-4d07-b989-0644c68b6043
        CommandLine|endswith:
            - '.bat'
            - '.bat"'
            - '.dat'
            - '.dat"'
            - '.dll'
            - '.dll"'
            - '.exe'
            - '.exe"'
            - '.gif'
            - '.gif"'
            - '.hta'
            - '.hta"'
            - '.jpeg'
            - '.jpeg"'
            - '.log'
            - '.log"'
            - '.msi'
            - '.msi"'
            - '.png'
            - '.png"'
            - '.ps1'
            - '.ps1"'
            - '.psm1'
            - '.psm1"'
            - '.vbe'
            - '.vbe"'
            - '.vbs'
            - '.vbs"'
            - ".bat'"
            - ".dat'"
            - ".dll'"
            - ".exe'"
            - ".gif'"
            - ".hta'"
            - ".jpeg'"
            - ".log'"
            - ".msi'"
            - ".png'"
            - ".ps1'"
            - ".psm1'"
            - ".vbe'"
            - ".vbs'"
    condition: all of selection_* and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium
regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_download_direct_ip_exec/info.yml