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.
MALWARE-CNC Win.Trojan.CrimsonRAT inbound connection attempt
This rule is looking an attempt by an attacker to infect client noted by reaching out to the cnc for command.
What To Look For
This rule alert on malicious traffic that attempts to make inbound connection to client.
No public information
No known false positives
Cisco Talos Intelligence Group