Massive Winos (ValleyRat) Phishing Campaigns Target Taiwan
⚠️FortiGuard Labs observed targeted phishing campaigns in Taiwan delivering Winos 4.0 (ValleyRat) and modular plugins via weaponized attachments and cloud-hosted links. Lures impersonate tax audits, e-invoice portals, and installer packages to trick recipients. Attackers employ rotating domains, malicious LNK files, DLL sideloading, and BYOVD using the vulnerable driver wsftprm.sys to gain kernel privileges and evade defenses. Fortinet detections include W64/Agent.ATW!tr and multiple email and gateway protections.
