BlackTech APT Deploys BlueShell Linux Backdoor Against Japanese Organizations

BlackTech has been linked to a newly examined Linux backdoor deployment against organizations in Japan, showing how a familiar remote-access tool can be reshaped for cyberespionage. The malware gives intruders a way to run commands, move files, and route traffic after they have already entered a network, raising the risk to internal systems and sensitive data. The attack begins after the attackers gain access and move laterally through the victim environment using SSH. From there, they deploy a loader that launches the backdoor, a method that reflects the group’s established interest in stealthy network access, including earlier BlackTech router intrusion activity targeting corporate networks. Analysts at IIJ Security...

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