malicious code Archives

Winsage

June 19, 2026

Microsoft finally admits its default Windows 11 25H2, 24H2 action broke key legacy component

Microsoft released Patch Tuesday updates for Windows 11, specifically KB5094126 and KB5093998, along with dynamic updates KB5094149, KB5095971, and KB5094156. Two issues have been acknowledged: malfunctioning Office applications and complications with the Recycle Bin. In July 2025, Microsoft changed the default settings of Windows 11 to JScript9Legacy in versions 24H2 and later, continuing with version 25H2 in October 2025. This change aimed to enhance security by addressing vulnerabilities related to legacy scripting, particularly cross-site scripting (XSS). A support article details a compatibility issue arising from the transition from jscript9.dll to jscript9legacy.dll, which affects how JScript manages execution context. Functions and definitions established by one script are no longer accessible to subsequent scripts, leading to failures in legacy applications. To address this, Microsoft released the KB5077241 update, which requires manual activation of persistent JScript execution context through a Registry setting. The steps to implement this solution involve creating a feature control registry key and configuring a DWORD value for specific processes or all processes.

Winsage

June 12, 2026

Hackers Use Fake Windows Update Installers to Deliver OnyxC2 Credential Stealer

OnyxC2 is a sophisticated credential stealer available for a subscription fee of 0 per month, distributed through disguised lures such as fake Windows updates and legitimate software installers. It functions as a commercial product with features like an automated payload builder, tiered licensing, and a centralized web dashboard. The malware boasts a 99% detection-evasion rate, successfully evading major antivirus solutions during tests. It is developed in C++, utilizing direct system calls and mutating with each build to avoid detection. OnyxC2 collects data from around 210 applications, targeting 45 web browsers, password managers, cryptocurrency wallets, and FTP clients. The malware is delivered using DLL sideloading, where a password-protected archive contains a legitimate application and a malicious DLL. The attacker's DLL is disguised by inflating its size and is loaded by a trusted binary. The malicious code remains encrypted on disk and decrypts in memory to evade analysis. OnyxC2 communicates with a Cloudflare-fronted command-and-control server to manage infected hosts and execute commands like hardware registration and cookie uploads. The threat extends to business environments, targeting FTP and email clients, with stolen session cookies allowing ongoing access to corporate infrastructure. Implementing anti-data exfiltration controls is recommended as a mitigation strategy.

Winsage

June 11, 2026

Microsoft patches a record 206 flaws—and one is already being exploited

Microsoft patched 206 vulnerabilities during June's Patch Tuesday, surpassing the previous record of 175 vulnerabilities patched in October 2025. Among the patched vulnerabilities, 118 are related to different versions of Windows, including Windows 10, Windows 11, and Windows Server. One critical vulnerability, CVE-2026-41091, in Microsoft Defender is actively being exploited, prompting an update to the Malware Protection Engine. Microsoft also addressed ten vulnerabilities in the Security Feature Bypass category due to the expiration of old Secure Boot certificates. Of the 118 Windows vulnerabilities, 19 are classified as critical Remote Code Execution (RCE) vulnerabilities, including CVE-2026-47288 and CVE-2026-47291. In Microsoft Office, 54 vulnerabilities were patched, including 25 RCE vulnerabilities, with nine classified as critical. Microsoft patched eight vulnerabilities in Exchange Server, including CVE-2026-45583, which can be exploited in a man-in-the-middle scenario. Additionally, the update for Edge addressed 74 Chromium vulnerabilities, including a zero-day vulnerability (CVE-2026-11645).

AppWizard

June 9, 2026

This New Computer Virus Is Disguising Itself As A Popular Video Game

Old-school gaming consoles are seeing a resurgence, but hackers are exploiting this trend with a malware campaign called "WeedHack," which emerged in January. This malware operates on a "Malware-as-a-Service" model, allowing users to purchase it to infect victims. WeedHack functions as a remote access infostealer, compromising computers to manipulate screens, access webcams, and steal sensitive data. It propagates by enticing users with unofficial "Minecraft" mods and clients, often using videos and download links as bait. Additionally, it employs "SEO poisoning" to promote fake websites as legitimate sources for these mods on platforms like Discord and Reddit. WeedHack disguises itself as a JAR file, similar to the official "Minecraft" client, and once executed, it installs its payload from Ethereum server domains. It can insert itself into antivirus exclusion lists, evading detection, and McAfee's tests show that Windows Defender is ineffective against it. The malware collects extensive information, including Wi-Fi networks and browser cookies, and grants hackers complete control over infected computers. The WeedHack virus serves as both malware and a training ground for aspiring hackers, structured into two tiers: a free version with core capabilities and a paid subscription for advanced features. A community has formed around WeedHack, offering tutorials, a Discord server, and a website for feature requests and custom payload creation. This community aspect lowers the barrier for newcomers, particularly targeting a younger audience that may not understand online safety.

AppWizard

June 8, 2026

Pirated PC games are delivering password-stealing malware

A surge in Windows malware campaigns has been identified, with malicious software hidden in pirated PC games and modified installers for popular franchises like Far Cry, Need for Speed, FIFA, and Assassin’s Creed. Over 400,000 devices globally have been affected, with around 30,000 cases in the United States. The malware, known as the "RenEngine loader," is disguised as a legitimate game launcher and infects systems when users download cracked games. It aims to deploy an infostealer called ARC, which can capture sensitive information such as passwords and cryptocurrency wallets, and may also install other harmful payloads like the Rhadamanthys stealer and Async Remote Access Trojan (RAT). Users often remain unaware of their infection until significant damage occurs. Recommendations for safety include avoiding unofficial downloads, using up-to-date anti-malware protection, and regularly updating software.

Tech Optimizer

June 6, 2026

Hackers Use Fake Purchase Orders to Deploy JS.MonoGlyphRAT Targeting US Enterprises

Researchers have identified a new malware called JS.MonoGlyphRAT, which disguises itself as business documents to infiltrate corporate networks. It is primarily spread through phishing emails targeting various sectors in the U.S. and has been reported in countries like Germany, Sweden, and Australia. The malware is classified as "Unknown malware" on threat intelligence platforms, making traditional antivirus solutions ineffective. It establishes a persistent presence in the network by executing a JavaScript file and communicating with command-and-control (C2) servers over HTTP. Key indicators of compromise include unusual HTTP traffic, registry changes, and the execution of specific JavaScript files. The malware can download additional payloads and execute commands without leaving traces on disk. Indicators of compromise include specific IP addresses, URLs, file hashes, and registry keys associated with the malware's operation.

AppWizard

June 2, 2026

Exclusive: How One Line of Code Put Billions of Microsoft Android App Downloads at Risk

A significant security vulnerability has been found in six Microsoft 365 Android applications, including Word, PowerPoint, Excel, Microsoft 365 Copilot, Microsoft Loop, and OneNote, due to an active debug flag left in the production code. This oversight allowed untrusted apps to request and receive access tokens, compromising user account security. An attacker could exploit this vulnerability by embedding malicious code in a widely distributed app, enabling unauthorized access to sensitive information such as emails, documents, and communications. Microsoft confirmed the issues and issued CVE numbers CVE-2026-41100, -41101, and -41102, releasing patches through their Patch Tuesday mechanism and a specific patched build on the Google Play Store. Users are advised to update their applications to mitigate the risk.

Winsage

June 2, 2026

PHANTOMPULSE RAT Uses UAC Bypass to Hijack Windows Systems

PHANTOMPULSE is a remote access trojan (RAT) used as a final payload in multi-stage attacks targeting Windows environments. It employs advanced post-exploitation techniques, including process injection, User Account Control (UAC) bypass, and a decentralized blockchain-based command-and-control (C2) mechanism. The malware utilizes three process injection techniques: module stomping, manual DLL mapping, and debug-driven execution. It avoids detection by using direct system calls instead of standard Windows APIs and incorporates a hardware breakpoint mechanism to disable security protections like AMSI and ETW. PHANTOMPULSE retrieves its C2 server address from Ethereum-based transaction data but has a vulnerability that allows defenders to hijack communication. It achieves persistence through scheduled tasks and supports self-healing capabilities. Privilege escalation is done using the "schuac" UAC bypass technique. The malware conducts system reconnaissance focusing on cryptocurrency wallets and messaging apps but does not directly steal credentials. It shows signs of AI-assisted development and shares tactics with DPRK-aligned threat groups, particularly in targeting cryptocurrency platforms.

Tech Optimizer

May 22, 2026

Threat Protection Pro: all you need to know about IPVanish’s anti-malware tool

Virtual Private Networks (VPNs) have evolved into comprehensive cybersecurity solutions, offering features like ad-blockers, antivirus software, and dark web monitoring. IPVanish offers a feature called Threat Protection Pro, available with the Advanced plan, which protects against malware, ads, and trackers. It enhances online security by blocking ads and tracking scripts, quarantining suspicious downloads, and preventing access to malicious websites. All IPVanish plans include core Threat Protection, utilizing DNS filters to combat trackers and malware across various platforms. Threat Protection Pro, launched in March 2026, provides 24/7 malware and antivirus protection, even when the VPN is not active. This feature is exclusive to Advanced-tier subscribers and currently supports Windows and Mac platforms. It employs VIPRE’s antivirus engine and initiates detailed measures to identify risks at multiple levels. Users can activate Threat Protection Pro through a straightforward setup process on Windows or MacOS. IPVanish allows unlimited devices per subscription and includes DNS and IPv6 leak protection, a kill switch, and a no-logs policy. Advanced users also have access to a Secure Browser for disposable browsing.

AppWizard

May 19, 2026

“I thought it was a Steam game”… Malicious code found planted on users’ PCs

'Beyond the Dark' is an indie game released for free on Steam on December 29, 2024, which was misrepresented as a turn-based strategy game despite displaying characteristics of a first-person horror game. Tech YouTuber Eric Parker identified it as an 'asset flip' and revealed that it distributed malware designed to steal cryptocurrency wallet information and Roblox account credentials. The malware was embedded in a DLL file activated upon the game's execution. Following Parker's findings, Valve removed the game from its platform within a day. The gaming community has seen similar incidents, such as the 'Blockbusters' game in September 2025, which was involved in a malware scheme that stole cryptocurrency. Security experts advise caution when installing free games that appear hastily produced.