Latest cybersecurity reporting from selected sources.

CISA confirms BlueHammer (CVE-2026-33825) is now used in ransomware attacks to gain SYSTEM privileges through Microsoft Defender. BlueHammer, tracked as CVE-2026-33825, has moved from proof-of-concept noise to real ransomware attacks in the wild, the US CISA confirms. BlueHammer allows attackers to escalate privileges locally in Microsoft Defender. The vulnerability, along with two other zero-days dubbed […]

CISA confirmed on Monday that ransomware gangs are now exploiting a Microsoft Defender privilege escalation vulnerability, dubbed BlueHammer, that has previously been abused in zero-day attacks. [...]

Eset Links Group's Growth to Integrated Endpoint-Killing ToolsEset researchers say the rapidly growing Gentlemen ransomware operation differentiates itself by supplying affiliates with a standardized EDR-killer suite that disables security tools, quickly incorporates newly disclosed vulnerable drivers and helps scale attacks across multiple regions worldwide.

Cybersecurity researchers have disclosed details of a new ransomware family called Osiris that targeted a major food service franchisee operator in Southeast Asia in November 2025

Cybersecurity researchers have discovered a new ransomware strain dubbed HybridPetya that resembles the notorious Petya/NotPetya malware, while also incorporating the ability to bypass the Secure Boot mechanism in Unified Extensible Firmware Interface (UEFI) systems using a now-patched vulnerability disclosed earlier this year

By weaponizing the ThrottleStop.sys driver, attackers are disrupting antivirus and endpoint detection and response (EDR) systems.

The ransomware group known as Kasseika has become the latest to leverage the Bring Your Own Vulnerable Driver (BYOVD) attack to disarm security-related processes on compromised Windows hosts, joining the likes of other groups like Akira, AvosLocker, BlackByte, and RobbinHood

A recently uncovered ransomware operation named 'Kasseika' has joined the club of threat actors that employs Bring Your Own Vulnerable Driver (BYOVD) tactics to disable antivirus software before encrypting files. [...]

A malicious toolset dubbed Spacecolon is being deployed as part of an ongoing campaign to spread variants of the Scarab ransomware across victim organizations globally

A new ransomware operation called Cactus has been exploiting vulnerabilities in VPN appliances for initial access to networks of "large commercial entities." [...]

A vulnerable anti-cheat driver for the Genshin Impact video game has been leveraged by a cybercrime actor to disable antivirus programs to facilitate the deployment of ransomware, according to findings from Trend Micro

We investigate mhyprot2.sys, a vulnerable anti-cheat driver for the popular role-playing game Genshin Impact. The driver is currently being abused by a ransomware actor to kill antivirus processes and services for mass-deploying ransomware.

Step one, get some scrambled files back. Steps two through 37... Kaspersky has found a vulnerability in the Yanluowang ransomware encryption algorithm and, as a result, released a free decryptor tool to help victims of this software nasty recover their files.…

Kaspersky today revealed it found a vulnerability in Yanluowang ransomware's encryption algorithm, which makes it possible to recover files it encrypts. [...]