HybridPetya Exploits UEFI Vulnerability to Bypass Secure Boot on Legacy Systems

ESET Research has uncovered a sophisticated new ransomware variant called HybridPetya, discovered on the VirusTotal sample sharing platform. This malware represents a dangerous evolution of the infamous Petya/NotPetya ransomware family, incorporating advanced capabilities to compromise UEFI-based systems and exploit CVE-2024-7344…

Microsoft Windows Defender Firewall Vulnerabilities Allow Privilege Escalation

Microsoft has released security advisories for four newly discovered vulnerabilities in its Windows Defender Firewall Service that could enable attackers to elevate privileges on affected Windows systems. The flaws, tracked as CVE-2025-53808, CVE-2025-54104, CVE-2025-54109, and CVE-2025-54915, were all disclosed on…

What is a stealth virus and how does it work?

<p>A stealth virus is a computer <a href=”https://www.techtarget.com/searchsecurity/definition/virus”>virus</a> that uses various mechanisms to avoid detection by <a href=”https://www.techtarget.com/searchsecurity/definition/antivirus-software”>antivirus software</a>. It takes its name from the term <i>stealth</i>, which describes an approach to doing something while avoiding notice.</p> <div class=”ad-wrapper ad-embedded”>…