Sigma rule: RegAsm.EXE Initiating Network Connection To Public IP

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-d89055326311, updated 2024-04-25T00:00:00.000Z.

Rule

Title: RegAsm.EXE Initiating Network Connection To Public IP
Status: test
Level: medium
Author: frack113
Date: 2024-04-25
File: rules/windows/network_connection/net_connection_win_regasm_network_activity.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects "RegAsm.exe" initiating a network connection to public IP adresses

Log source

product: windows
category: network_connection

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'  # IPv6 loopback
        - 'fe80::/10'  # IPv6 link-local addresses
        - 'fc00::/7'  # IPv6 private addresses
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1218.009

References

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/network_connection/net_connection_win_regasm_network_activity.yml

Sources and licences

SigmaHQ
"RegAsm.EXE Initiating Network Connection To Public IP" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/network_connection/net_connection_win_regasm_network_activity.yml.
Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License
Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: RegAsm.EXE Initiating Network Connection To Public IP",
entity page, dataset version ref-d89055326311, updated 2024-04-25T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/0531e43a-d77d-47c2-b89f-5fe50321c805 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 0531e43a-d77d-47c2-b89f-5fe50321c805, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.