Silver Fox APT Exploits DLL Sideloading and BYOVD In Stealth Campaign

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Silver Fox APT Exploits DLL Sideloading and BYOVD In Stealth Campaign

Cyberpress • February 23, 2026

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FortiGuard Labs has uncovered a series of targeted phishing campaigns in Taiwan attributed to the Silver Fox APT group. The operations.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

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

APT Groups (1)

Attack Types (1)

Campaigns (1)

Stealth Campaign

Countries (1)

MITRE ATT&CK (1)

T1574 - Hijack Execution Flow