New Winos 4.0 Malware Strain Emerges as Major Threat to Windows Systems

FortiGuard Labs has uncovered a formidable new strain of malware, dubbed Winos 4.0, targeting Microsoft Windows users, with a particular focus on individuals in Taiwan.

First detected in January 2025, this malicious campaign leverages cunning phishing tactics, masquerading as communications from Taiwan’s National Taxation Bureau.

Phishing Campaign Targets Taiwanese Users

Attackers distribute the malware through deceptive emails containing malicious attachments or hyperlinks that, once clicked, initiate a complex infection chain.

The impact of this threat is severe, with stolen data potentially fueling future cyberattacks, earning it a high severity rating. The technical intricacy of Winos 4.0 sets it apart as a significant menace.

The malware is often delivered via phishing emails that impersonate government or business entities, using lures related to taxes or invoices to prompt immediate action from unsuspecting recipients.

These emails frequently include ...