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Silver Fox APT Uses DLL Sideloading and BYOVD Techniques in Sophisticated Malware Attacks

Cybersecuritynews •Tushar Subhra Dutta • February 23, 2026

The cybersecurity community recently witnessed the emergence of targeted malware campaigns linked to the Silver Fox threat group. This operation focuses heavily on Asia, targeting local organizations with carefully localized lures. By disguising attacks as routine business communications, actors successfully distributed the Winos 4.0 malware, known as ValleyRat, into corporate networks. To compromise victim systems, […]

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Silver Fox APT Targets Taiwan with Winos 4.0 Malware Campaign Silver Fox APT is conducting targeted attacks in Taiwan utilizing DLL sideloading and BYOVD techniques to deploy Winos 4.0 (ValleyRat). The campaigns leverage localized phishing lures related to tax and e-invoice processes, impacting Microsoft Windows users and leading to widespread file encryption and potential data theft. 4 sources 45

Extracted Entities

Silver Fox APT Uses DLL Sideloading and BYOVD Techniques in Sophisticated Malware Attacks

The full story

Extracted Entities

APT Groups (1)

Attack Types (1)

Malware (2)

MITRE ATT&CK (1)