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 Win.Doc.GrayEnergy malicious document download attempt

Rule Explanation

This event is generated when the victim tries to download malicious document which tries to execute macros and connect to C2 servers Impact: A Network Trojan was detected Details: IOC: f50ee030224bf617ba71d88422c25d7e489571bc1aba9e65dc122a45122c9321 Ease of Attack:

What To Look For

Known Usage

No public information

False Positives

No known false positives


Cisco Talos Intelligence Group

MITRE ATT&CK Framework



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

Additional Links

Rule Vulnerability

CVE Additional Information