Potentially Suspicious Regsvr32 HTTP/FTP Pattern (via process_creation)

title: Potentially Suspicious Regsvr32 HTTP/FTP Pattern (via process_creation)
id: 4e8a590b-4331-5ff7-8da1-a0ba2998030a
status: stable
description: This rule detects regsvr32 execution to download/install/register new DLLs that are hosted on Web or FTP servers.
references:
    - https://attack.mitre.org/techniques/T1218/010/
    - https://twitter.com/mrd0x/status/1461041276514623491
    - https://twitter.com/tccontre18/status/1480950986650832903
    - https://lolbas-project.github.io/lolbas/Binaries/Regsvr32/
author: Huntrule Team
date: 2026-01-19
tags:
    - attack.stealth
    - attack.t1218.010
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\regsvr32.exe'
        - OriginalFileName: 'REGSVR32.EXE'
    selection_flag:
        CommandLine|contains:
            - ' /i'
            - ' -i'
    selection_protocol:
        CommandLine|contains:
            - 'ftp'
            - 'http'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium