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Chinese Hackers Attacking Linux Devices With New SSH Backdoor


A sophisticated cyber espionage campaign attributed to the Chinese hacking group DaggerFly has been identified, targeting Linux systems through an advanced Secure Shell (SSH) backdoor known as ELF/Sshdinjector.A!tr.

This malware, part of a broader attack framework, compromises Linux-based network appliances and Internet-of-Things (IoT) devices, enabling data exfiltration and prolonged persistence within compromised environments.

Discovered in mid-November 2024, the backdoor was utilized during the Lunar Peek campaign, a coordinated series of attacks on network appliances.

Analysis by FortiGuard Labs reveals that the attack deploys a combination of malicious components, including a dropper, a malicious SSH library (libsshd.so), and other files designed to maintain infection and avoid detection.

Infection Mechanics

The malware initiates with a dropper binary, which verifies the host’s root privileges before infection.

If the target is deemed vulnerable, the dropper overwrites key system binaries such as ls, netstat, and crond with malicious versions.

It ...


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