Winsage
November 7, 2024
Cybersecurity researchers at Fortinet’s FortiGuard Labs have identified a malware campaign named Winos4.0 that disguises itself as benign gaming applications targeting Microsoft Windows users. This malware framework is similar to threats like Cobalt Strike and Sliver. Users who download these applications inadvertently install Trojan horses that deploy the Winos4.0 framework, which has been found in various gaming-related tools. The malware appears to focus on the education sector, as indicated by its file description “校园政务” (Campus Administration).
Winos4.0 is a re-engineered version of the Gh0stRat remote access trojan and consists of modular components for specific tasks. The attack begins with the retrieval of a BMP file from a remote server, leading to the extraction of a DLL file named “you.dll.” This file downloads additional files, including the main malicious file “libcef.dll,” which injects shellcode to establish a connection with a command and control (C2) server. The malware executes various tasks, such as monitoring system information and maintaining a connection to the C2 server.
To protect against such threats, users are advised to download applications only from reputable sources, avoid third-party app stores, and scan new files before execution. Regular device scans are recommended, especially after downloading new content.
