Rule Category

MALWARE-CNC -- Snort has detected a Comand and Control (CNC) rule violation, most likely for commands and calls for files or other stages from the control server. The alert indicates a host has been infiltrated by an attacker, who is using the host to make calls for files, as a call-home vector for other malware-infected networks, for shuttling traffic back to bot owners, etc.

Alert Message

MALWARE-CNC User-Agent known malicious user-agent string - Mirai

Rule Explanation

This rule looks for the string: Hello, world as the User-Agent string inside of an HTTP request. This string has been seen to be used as an initial step of the Mirai botnet to download malicious artifacts.

What To Look For

This rule looks for a malicious User Agent string belonging to the Mirai botnet

Known Usage

No public information

False Positives

No known false positives


Cisco Talos Intelligence Group

Rule Groups

No rule groups



Additional Links

Rule Vulnerability

No information provided

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.


MITRE ATT&CK Framework

Tactic: Command and Control

Technique: Custom Command and Control Protocol

For reference, see the MITRE ATT&CK vulnerability types here: