Threat Advisories:

MedusaLocker Uses ThrottleStop.sys Flaw to Kill AV on Windows Malicious npm Packages Target WhatsApp Developers with Kill Switch Trend Micro Warns of Active Exploits in Apex One Console SafePay Ransomware’s Rapid Ascent to the Top of the Cybercrime Scene Adobe Patches Three Critical Flaws in AEM Forms on JEE Plague in the Shadows: Unmasking a Silent Linux Backdoor RoKRAT Resurfaces: APT37’s Fileless Shortcut to Espionage Secret Blizzard Strikes Moscow with ApolloShadow Alone Theme Vulnerability Puts WordPress Sites at Risk Scattered Spider’s Hypervisor Attack on VMware vSphere Operation GhostChat and PhantomPrayers Breach Tibetan Trust July 2025 Linux Patch Roundup Operation CargoTalon: Targeting Russian Aerospace & Defense Sector Greedy Sponge’s Stealthy RAT Attack in Mexico APT41 Targets African Government IT Services Critical Cisco ISE Flaws Actively Exploited in the Wild Ghost Crypt Delivers PureRAT in Accounting Firm Attack Zero Day Watch CVE-2025-53770 Turns SharePoint into a Pivot Point Critical Zero-Day in CrushFTP Exposes Admin Interface Taiwan’s Semiconductor Firms Under Siege by Chinese Cyber Operations

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MedusaLocker Uses ThrottleStop.sys Flaw to Kill AV on Windows

Red | Attack Report

A new BYOVD attack abuses a vulnerability in the legitimate ThrottleStop.sys driver (CVE-2025-7771) to disable antivirus and EDR protections by enabling kernel-level memory manipulation from user mode. In one incident in Brazil, attackers used stolen RDP credentials, deployed a renamed version of the driver (ThrottleBlood.sys) with a malicious tool to terminate AV processes, and then launched MedusaLocker ransomware. Defenders are urged to monitor for or block the driver until a fix becomes available.

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