DHS and FBI attributed Volgmer backdoor activity to North Korean government-linked HIDDEN COBRA and distributed IP addresses, malware descriptions, signatures, and mitigation guidance for defenders. The alert says FBI had high confidence the listed IPs were being used to maintain victim-network presence and support further exploitation. Volgmer had been observed since at least 2013 against government, financial, automotive, and media organizations, with suspected spear phishing as a primary delivery route and possible co-presence of other HIDDEN COBRA tools. The malware provides covert access through system reconnaissance, registry service persistence, file transfer, command execution, process termination, directory listing, and in one analyzed sample botnet controller functionality. Its C2 communications use a custom binary protocol, often over TCP 8080 or 8088, with some payloads using SSL, and the infrastructure included at least 94 static IPs plus dynamic IPs across several countries.