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 DNS Fast Flux attempt

Rule Explanation

This rule is looking for a DNS response that contains several answers to a single query where each response has an abnormally small TTL.

What To Look For

This rule alerts on malicious DNS responses.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic: Command and Control

Technique: Connection Proxy

For reference, see the MITRE ATT&CK vulnerability types here: https://attack.mitre.org

Additional Links

Rule Vulnerability

N/A

Not Applicable

CVE Additional Information