Solar Closes Web Security Gap Exploited Through Archive Files
Russian cybersecurity developer Solar Group has released Solar webProxy 4.5, adding deep inspection capabilities for archive files. The update is designed to block malicious content that previously could pass into corporate networks undetected.
According to the company’s analysts, archive files became one of the most common methods for delivering malicious payloads through web traffic in 2025, accounting for about 37% of such incidents. Roughly 22% of those archives were downloaded through browsers, bypassing email filtering systems. The problem was particularly acute in the financial and industrial sectors.
The updated platform can unpack nested archives and inspect every file inside according to security policies. If even one file violates policy rules, the entire archive is blocked. The system can also identify password-protected files through digital signatures without attempting password cracking and can block them automatically under security rules.
