VERY IMPORTANT

A zero-day vulnerability in 7-Zip (CVE-2025-0411) was exploited by Russian cybercrime groups to target Ukrainian organizations. The vulnerability allows bypassing Windows Mark-of-the-Web protections through double archiving, enabling execution of malicious content. The campaign involved spear-phishing emails with homoglyph attacks to trick users into executing malicious files. The exploit was likely part of a cyberespionage effort in the ongoing Russo-Ukraine conflict. Affected organizations include government entities and businesses. Recommendations include updating 7-Zip, implementing email security measures, and training employees on phishing and homoglyph attacks.