Suspicious RegAsm.EXE Initiating Network Connection To Public IP (via network_connection)

title: Suspicious RegAsm.EXE Initiating Network Connection To Public IP (via network_connection)
id: 6d3b0d8e-6c81-5c42-a20c-01d786dded49
status: stable
description: This rule detects "RegAsm.exe" initiating a network connection to public IP adresses
references:
    - https://attack.mitre.org/techniques/T1218/009/
    - https://app.any.run/tasks/ec207948-4916-47eb-a0f4-4c6abb2e7668/
    - https://research.splunk.com/endpoint/07921114-6db4-4e2e-ae58-3ea8a52ae93f/
    - https://lolbas-project.github.io/lolbas/Binaries/Regasm/
author: Huntrule Team
date: 2026-07-08
tags:
    - attack.stealth
    - attack.t1218.009
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Initiated: 'true'
        Image|endswith: '\regasm.exe'
    filter_main_local_ranges:
        DestinationIp|cidr:
            - '127.0.0.0/8'
            - '10.0.0.0/8'
            - '172.16.0.0/12'
            - '192.168.0.0/16'
            - '169.254.0.0/16'
            - '::1/128'
            - 'fe80::/10'
            - 'fc00::/7'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium