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The U.S. Department of Homeland Security (DHS) and the FBI have issued another joint alert about a new piece of malware that the prolific North Korean APT hacking group Hidden Cobra has actively been using in the wild.

Hidden Cobra, also known as Lazarus Group and Guardians of Peace, is believed to be backed by North Korean government and known to launch cyber attacks against media organisations, aerospace, financial and critical infrastructure sectors across the world.

The hacking group was the same associated with the 2017 WannaCry ransomware menace, the 2014 Sony Pictures hack, and the SWIFT Banking attack in 2016.

Now, the DHS and the FBI have uncovered a new malware variant, dubbed ELECTRICFISH, that Hidden Cobra hackers have been using for secretly tunneling traffic out of compromised computer systems.

The malware implements a custom protocol configured with a proxy server/port and proxy username and password, allowing hackers to bypass the compromised system’s required authentication to reach outside of the network.

The ElectricFish malware is a command-line utility whose primary purpose is to quickly funnel traffic between two IP addresses.

The malware allows Hidden Cobra hackers to configure with a proxy server/port and proxy username and password, making it possible to connect to a system sitting inside of a proxy server, which allows the attackers to bypass the infected system’s required authentication.

“It will attempt to establish TCP sessions with the source IP address and the destination IP address. If a connection is made to both the source and destination IPs, this malicious utility will implement a custom protocol, which will allow traffic to rapidly and efficiently be funnelled between two machines,” the alert reads.

“If necessary, the malware can authenticate with a proxy to be able to reach the destination IP address. A configured proxy server is not required for this utility.”

Once ElectricFish authenticates with the configured proxy, it immediately attempts to establish a session with the destination IP address, located outside of the victim network and the source IP address. The attack would use command prompts to specify the source and destination for tunnelling traffic.

images from Hacker News