Silver Fox APT Targets Taiwan with Winos 4.0 Malware Campaign

Silver Fox APT Targets Taiwan with Winos 4.0 Malware Campaign

First seen 23 Feb 2026, 06:09 UTC •FortinetGbhackersCybersecuritynewsCyberpress •78% similarity •45.2

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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.

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Timeline

2026-02-21
FortiGuard Labs reports on Silver Fox phishing campaigns in Taiwan
2026-02-23
Gbhackers details Silver Fox APT's use of DLL sideloading and BYOVD

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