Windows Kernel

AppWizard
April 30, 2026
Cybersecurity threat hunters have discovered an active infostealer campaign targeting the gaming community, involving malware called LofyStealer (or GrabBot) that disguises itself as a Minecraft hack named “Slinky.” The attackers use the official game icon to trick young gamers into executing the malware. The Brazilian cybercrime group LofyGang has enhanced its technical capabilities, utilizing a sophisticated two-stage modular architecture. The initial stage features a 53.5 MB loader file named load.exe, which is a Node.js runtime environment that obscures malicious signatures. The loader connects to the attacker’s server and decrypts a 1.4 MB C++ payload, chromelevator.exe, which targets eight web browsers to extract sensitive information like cookies and passwords. The stolen data is compressed, encrypted, and sent to the attacker’s server. LofyGang has evolved into a Malware-as-a-Service platform, offering a web panel for operators to monitor victims and generate custom executables. The campaign highlights the increasing threats to the gaming community, with advanced evasion techniques being employed by cybercriminals. Security professionals are advised to monitor network traffic and conduct audits for suspicious activities.
Winsage
April 23, 2026
A computer enthusiast has developed a tool called WSL9x, which allows users to run contemporary Linux kernels on early versions of Windows (from Windows 95 onward) and on machines with 486 CPUs. WSL9x enables the simultaneous operation of Windows and Linux applications without relying on hardware virtualization. The architecture includes a client program, wsl.com, which manages a DOS window for the console driver. Meanwhile, the Linux community is phasing out support for the Intel 486 CPU, with developers removing related support options in the Linux kernel, marking the end of support for this processor.
Winsage
April 22, 2026
Hailey has developed the Windows 9x Subsystem for Linux (WSL9x), which allows the 6.19 Linux kernel to run on Windows 9x systems without a graphical user interface, relying instead on a terminal experience. WSL9x consists of three main components: a modified Linux kernel that interacts with Windows 9x APIs, a virtual device (VxD) driver that initializes WSL9x and manages userspace events, and a simple 16-bit DOS client for passing commands to the Linux kernel. The system handles syscalls through a general protection fault handler due to limitations in the Win9x architecture. However, this setup poses security risks as both the Linux kernel and Windows kernel operate with the same CPU privileges, meaning instability could occur if either crashes. Comprehensive instructions for installation are available on Hailey's Codeberg page.
Winsage
March 31, 2026
Microsoft will eliminate default trust for kernel drivers signed through the outdated cross-signed root program with the April 2026 Windows update. All new kernel drivers must be certified via the Windows Hardware Compatibility Program (WHCP). This change will affect Windows 11 builds 24H2, 25H2, and 26H1, as well as Windows Server 2025, with future versions following the same standards. The update will begin in evaluation mode, monitoring driver loads for compliance before transitioning to enforcement mode. An allow list of reputable drivers will be maintained for legacy hardware, and enterprises can use Application Control for Business policies to authorize specific drivers. Users with older hardware may face compatibility issues if their drivers are not WHCP-certified.
Winsage
March 27, 2026
Microsoft is enhancing the security of the Windows kernel by eliminating trust for kernel drivers not certified through the Windows Hardware Compatibility Program (WHCP) starting with the April 2026 Windows Update. This change specifically targets kernel drivers signed by the now-obsolete cross-signed root program, which has been associated with security vulnerabilities. The new policy will initially be introduced in an "evaluation mode" to monitor and audit driver loads for potential compatibility issues. Custom kernel drivers can still be used under the Application Control for Business policy, but must be signed by an authority within the device's Secure Boot Platform Key or Key Exchange Key variables. The changes will impact Windows 11 versions 24H2, 25H2, 26H1, and Windows Server 2025.
Tech Optimizer
March 27, 2026
A deceptive website impersonating Avast antivirus tricks users into downloading Venom Stealer malware, which steals passwords, session cookies, and cryptocurrency wallet information. The site conducts a fake virus scan, falsely reporting threats to encourage users to download a malicious file named Avastsystemcleaner.exe. This file mimics legitimate software and operates stealthily, targeting web browsers to harvest credentials and session cookies. It also captures screenshots and sends stolen data to the command-and-control domain app-metrics-cdn[.]com via unencrypted HTTP. The malware employs evasion techniques to avoid detection and is part of a long-standing cybercrime tactic that exploits user trust in security software. Indicators of compromise include the file hash SHA-256: ecbeaa13921dbad8028d29534c3878503f45a82a09cf27857fa4335bd1c9286d, the domain app-metrics-cdn[.]com, and the network indicator 104.21.14.89.
Winsage
February 26, 2026
Security researchers have developed a working Proof of Concept (PoC) exploit for a vulnerability in the Windows kernel, identified as CVE-2026-2636, which allows low-privileged users to induce a Blue Screen of Death (BSoD), resulting in a Denial of Service. This vulnerability is linked to the Windows Common Log File System (CLFS) driver, specifically the CLFS.sys component, and arises from improper handling of invalid or special elements within CLFS (CWE-159). The PoC demonstrates that a non-administrative user can trigger the bug by executing a crafted ReadFile operation on a handle linked to an opened .blf log file without the expected I/O Request Packet (IRP) flags set. This leads to a critical inconsistency in the driver, causing Windows to invoke the kernel routine KeBugCheckEx, which results in a BSoD. The CVE-2026-2636 has a CVSS score of 5.5 (Medium) and poses a high impact on availability, allowing any authenticated user to crash the host reliably. Microsoft addressed this vulnerability in the September 2025 cumulative update, protecting systems running Windows 11 2024 LTSC and Windows Server 2025 by default. However, older or unpatched builds remain vulnerable. Organizations are advised to verify the deployment of the September 2025 updates, prioritize patching multi-user systems, and monitor for unusual spikes in BSoD events.
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