NetSarang v5.0 Malicious Backdoor Supply Chain Compromise

NetSarang Xmanager Enterprise 5.0 Build 1232, Xmanager 5.0 Build 1045, Xshell 5.0 Build 1322, Xftp 5.0 Build 1218, and Xlpd 5.0 Build 1220 contain a malicious nssock2.dll that implements a multi-stage, DNS-based backdoor. The dormant library contacts a C2 DNS server via a specially crafted TXT record for a month‑generated domain. After receiving a decryption key, it then downloads and executes arbitrary code, creates an encrypted virtual file system (VFS) in the registry, and grants the attacker full remote code execution, data exfiltration, and persistence. NetSarang released builds for each product line that remediated the compromise: Xmanager Enterprise Build 1236, Xmanager Build 1049, Xshell Build 1326, Xftp Build 1222, and Xlpd Build 1224. Kaspersky Lab identified an instance of exploitation in the wild in August 2017.

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内嵌的恶意代码

NetSarang多款产品 安全漏洞

NetSarang Xshell等都是美国NetSarang公司的产品。NetSarang Xshell是NetSarang Xmanager是一个功能强大、方便的 PC X 服务器软件包。NetSarang XLPD是远程打印工具。 NetSarang多款产品存在安全漏洞，该漏洞源于恶意nssock2.dll实现基于DNS的多阶段后门，可能导致远程代码执行和数据渗漏。以下产品及版本受到影响：NetSarang Xmanager Enterprise 5.0 Build 1232版本、Xmanager 5

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