Threat actorcritical
Russia-linked APT28 uses PRISMEX to infiltrate Ukraine and allied infrastructure with advanced tactics
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-21509 | Local Security Feature Bypass in Microsoft Office Under Active Exploitation | 7.8 | 71% | KEV | KEV |
| CVE-2026-21513 | MSHTML Security Feature Bypass in Windows Exploited in the Wild (CVE-2026-21513) | 8.8 | 16% | KEV | KEV |
Indicators of compromise
auto-extracted · verify before use · export allAll| Type | Indicator | Context |
|---|---|---|
| domain | filen.io | PrismexStager, connects to command-and-control servers via Filen.io cloud services. This helps attackers blend malicious traffi |
From the original article
4 min read at securityaffairs.com
APT28 targets Ukraine and allies with PRISMEX malware, using stealthy techniques for espionage and command-and-control. Russia-linked group APT28 (aka UAC-0001, aka Fancy Bear , Pawn Storm , Sofacy Group , Sednit , BlueDelta, and STRONTIUM ) is running a spear-phishing campaign against Ukraine and its allies, deploying a new malware suite called PRISMEX.
By @securityaffairs · securityaffairs.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.