North Koreas DDoS botnet infrastructure is also sometimes referred to as Hidden Cobra. The Department of Homeland Security (DHS) and the Federal Bureau of Investigation (FBI) released a technical alert on Hidden Cobra, the malicious cyber activities by the North Korean government. The alert provides technical details on the tools and infrastructure, including IP addresses associated with DeltaCharlie. Also listed were indicators of compromise, malware descriptions, network signatures, and host-based rules that network admins can use to detect activity.”]
Source: https://informationsecuritybuzz.com/study-research/hidden-cobra-deltacharlie-explainer/