Gamaredon exploits WinRAR to attack Ukraine with GammaWorm and GammaSteel

Published on June 02, 2026 | Translated from Spanish

The Russian group Gamaredon has exploited a vulnerability in WinRAR to infiltrate devices in Ukraine with the GammaWorm and GammaSteel viruses. These programs focus on stealing sensitive personal and government information. The case demonstrates that any flaw in common software can become a gateway for cyberattacks. Keeping programs updated and using antivirus software are necessary steps to reduce risks.

WinRAR vulnerability exploited during a cyberattack, computer screen showing malicious code extracted from a compressed file, broken WinRAR icon with digital cracks, GammaWorm virus spreading as bright red lines towards Ukrainian documents, GammaSteel extracting sensitive government data, keyboard with partially illuminated Ukrainian flag, dark background with failing antivirus alerts, cinematic photorealistic technical illustration, dramatic blue and red lighting, metallic textures and circuits, high definition

How the WinRAR vulnerability operates 🛡️

The exploited breach allows attackers to execute malicious code without user interaction when opening a compressed file. GammaWorm spreads across the local network to steal credentials and documents, while GammaSteel extracts data from applications and browsers. Both payloads use obfuscation techniques to evade initial detection. Updating WinRAR to its latest version closes this door, underscoring the importance of patching everyday programs.

From compressing files to compressing your security 😅

Who would have thought that unzipping a .rar would be so exciting. Now, every time you open a file, it's like playing digital Russian roulette. Next thing you know, even the Windows calculator will have exploits. But don't worry, as long as you keep using WinRAP from 2005, hackers will thank you for the fresh material for their reports.