How XShell Became a Backdoor: Deep Dive into Its Malicious Shellcode

Tencent Security Lab dissected the compromised XShell remote terminal, revealing a three‑stage malicious process where patched binaries load encrypted shellcode, exfiltrate system information via dynamically generated DGA domains, and ultimately deploy a svchost‑based payload, with detailed IOC listings and remediation advice.

DGAInformation SecurityIoC

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How XShell Became a Backdoor: Deep Dive into Its Malicious Shellcode

Efficient Ops

Aug 14, 2017 · Information Security

Critical Xshell Backdoor Alert: How Malicious DLLs Leak Data and What to Do

A recent security advisory reveals that popular remote terminal Xshell versions contain a backdoor in the nssock2.dll component, enabling shellcode to harvest host information, generate monthly DGA domains, and potentially expose sensitive data, prompting immediate version checks and upgrades.

DGAInformation SecurityXshell

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Critical Xshell Backdoor Alert: How Malicious DLLs Leak Data and What to Do