FishMonger’s arsenal upgraded: SprySOCKS for Windows
ESET researchers have discovered two as-yet undocumented Windows variants of SprySOCKS, a previously Linux-only backdoor reportedly used by FishMonger, the group believed to be operated by a Chinese contractor named I‑SOON. While we initially discovered the malware samples on VirusTotal, ESET telemetry shows real activity between 2023 and 2024, with several victims in Honduras, Taiwan, Thailand, and Pakistan, targeting mostly government organizations.
The Windows variants discovered are internally marked as WIN_DRV and WIN_PLUS. Both come with a hardcoded C&C configuration and support communication over TCP, UDP, and WebSocket protocols. The core backdoor functionality for both includes support for over 30 C&C commands, covering various functionalities including system information collection, process enumeration, as well as service management and file management functions such as listing, creating, deleting, and transferring files.
In addition to the core backdoor functionality, the WIN_DRV version utilizes kernel drivers to hide the malware’s network connections, processes, files,...
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