SID 1:64466

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.Trojan.KoiStealer outbound connection attempt

Rule Explanation

This rule looks for HTTP indicators known to be specific to Win.Trojan.KoiStealer outbound cnc connection attempts.

What To Look For

This rule fires on when a Win.Trojan.KoiStealer variant is detected making an outbound cnc connection.

Known Usage

Attacks/Scans seen in the wild

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group