Infostealers landscape exploded in 2024 and they remain a top threat today. If Windows remains a nice target (read: Attackers&#;x26;#;39; favorite), I spotted an Infostealer targeting Android devices. This sounds logical that attackers pay attention to our beloved mobile devices because all our life is stored on them.
Summary Check Point Research (CPR) identified a security vulnerability in January 2025 affecting the new Rust-based kernel component of the Graphics Device Interface (commonly known as GDI) in Windows. We promptly reported this issue to Microsoft and they fixed the vulnerability starting with OS Build 26100.4202 in the KB5058499 update preview released on May 28th 2025. In the following sections, we […] The post Denial of Fuzzing: Rust in the Windows kernel appeared first on Check Point Research .
The tech giant has rolled out fixes for 173 CVEs, including five critical-severity security defects. The post Microsoft Patches 173 Vulnerabilities, Including Exploited Windows Flaws appeared first on SecurityWeek .
Users can continue receiving important security updates for Windows 10 by enrolling in the ESU program. The post Windows 10 Still on Over 40% of Devices as It Reaches End of Support appeared first on SecurityWeek .
Google Threat Intelligence Group (GTIG) is tracking BRICKSTORM malware activity, which is being used to maintain persistent access to victim organizations in the United States. Since March 2025, Mandiant Consulting has responded to intrusions across a range of industry verticals, most notably legal services, Software as a Service (SaaS) providers, Business Process Outsourcers (BPOs), and Technology. The value of these targets extends beyond typical espionage missions, potentially providing data to feed development of zero-days and establishing pivot points for broader access to downstream victims.
Gunra Ransomware is a double extortion group targeting global victims, excluding the US. They primarily attack Windows systems, recently expanding to Linux. The group uses phishing as their main vector and negotiates through a WhatsApp-themed chat panel. They can encrypt large files quickly using advanced stream ciphers. The Data Leak Site has undergone several changes, including a brief clearweb presence. Victims span multiple countries and industries, with South Korea, Brazil, and Japan topping the list. The ransomware shares code similarities with Conti and Akira, but newer versions appear unique. Negotiations reveal ambitious ransom demands, sometimes unrealistic. The group employs various evasion techniques and uses multiple MITRE ATT&CK tactics.
ZynorRAT is a newly discovered Go-based Remote Access Trojan that provides a full suite of command and control capabilities for Linux and Windows systems. It was first identified in July 2025 and is believed to be of Turkish origin. The malware uses Telegram as its C2 infrastructure and offers features such as file exfiltration, system enumeration, screenshot capture, persistence through systemd services, and arbitrary command execution. The Linux version is fully functional, while the Windows version appears to be in early development. The malware's author seems to be actively working on improving its detection avoidance. ZynorRAT's capabilities include discovery, exfiltration, persistence, and remote code execution on victim machines.
Salat Stealer, a sophisticated Go-based infostealer targeting Windows systems, has been identified. It exfiltrates browser credentials, cryptocurrency wallet data, and session information while employing advanced evasion techniques. The malware uses UPX packing, process masquerading, registry run keys, and scheduled tasks for persistence and evasion. Operated under a Malware-as-a-Service model by Russian-speaking actors, it leverages resilient C2 infrastructure. The stealer targets multiple browsers, cryptocurrency wallets, and Telegram sessions. It communicates with its C2 server using UDP and HTTPS, with multiple fallback domains for redundancy. The control panel supports real-time interaction through WebSockets and includes features for remote command execution and system manipulation.
A global malware infection of Windows computers has been uncovered, stemming from software users installed themselves. The malware, disguised as legitimate PDF editors and manual finders, turns infected systems into residential proxies for malicious actors. The infection chain starts with deceptive ads posing as PDF manuals. The campaign, which appears to have ceased, was widespread due to large-scale advertising. The malware creates scheduled tasks, executes JavaScript files, and communicates with various C2 domains. It's potentially linked to the OneStart Browser, known for spreading spyware and adware. Authorities advise blocking access to related domains, checking for specific applications, and removing software signed by certain certificate issuers.
Lazarus, an APT group with suspected East Asian origins, has recently employed the ClickFix social engineering technique in their phishing attacks. The group, known for targeting financial institutions and cryptocurrency exchanges, now uses fake job opportunities to lure victims to interview websites. These sites prompt users to 'fix' non-existent camera issues, tricking them into downloading malware disguised as Nvidia software updates. The malware deploys a Node.js environment and executes BeaverTail, a common Lazarus tool. On Windows 11 systems, an additional backdoor (drvUpdate.exe) is installed. The attack also affects macOS users. The malware establishes persistence and connects to command and control servers for further instructions and data exfiltration.
TinkyWinkey is a sophisticated Windows-based keylogger that combines persistent service execution, low-level keyboard hooks, and comprehensive system profiling. It captures all keystrokes, including special keys and multi-language input, alongside detailed system metrics such as CPU, memory, OS version, and network identifiers. The malware uses DLL injection into trusted processes and service-based persistence for stealth. It creates a log file in the user's temp directory, recording system reconnaissance details and user activity data. First observed in June 2025, TinkyWinkey exemplifies the evolving threat landscape, leveraging advanced programming techniques to maintain stealth and maximize data capture. Organizations should monitor for unusual service activity, unexpected DLL injections, and persistent logging patterns to mitigate this threat.
A VBS-based infostealer called Cmimai Stealer has emerged, targeting Windows systems since June 2025. It collects system information, browser metadata, and screenshots, exfiltrating data via Discord webhooks. The malware uses PowerShell scripts for browser data collection and screen capture, running in a persistent loop every hour. It leverages WMI for system information gathering and employs JSON formatting for data exfiltration. While lacking advanced features like encrypted communication or credential theft, Cmimai Stealer serves as both an infostealer and a reconnaissance tool. Defensive considerations include monitoring high-risk process combinations, watching for specific PowerShell scripts and image files, and detecting Discord traffic with a unique User-Agent.
The analysis team has categorized attacks on MS-SQL and MySQL servers installed on Windows systems during Q2 2025. While the number of targeted systems remains stable, attacks on MS-SQL servers have been decreasing. MySQL servers saw a significant spike in attacks in June 2025. The report provides detailed statistics on attack trends, including graphs illustrating the attack status for both server types. It also includes a list of MD5 hashes, URLs, FQDNs, and IP addresses associated with the malicious activities. The analysis covers various types of malware and tools used in these attacks, ranging from backdoors and miners to ransomware and remote access trojans.
AhnLab Security Intelligence Center analyzed attacks on Windows web servers during Q2 2025 using their Smart Defense infrastructure. The study focused on poorly managed servers, categorizing attack types and malware strains. It revealed that multiple threat actors often target vulnerable servers simultaneously, exploiting unpatched systems or misconfigurations. Attackers typically use file upload vulnerabilities to deploy web shells and execute commands, but may also exploit framework or Web Application Server weaknesses. The analysis provides detailed statistics on the number of affected systems and the frequency of attacks, offering insights into the current threat landscape for Windows-based web servers.
A malicious campaign using the domain 'telegrampremium[.]app' is distributing a new variant of Lumma Stealer malware. The fake site mimics the official Telegram Premium platform and automatically downloads an executable file 'start.exe' upon access. This sophisticated information-stealing trojan can exfiltrate browser credentials, cryptocurrency wallet details, and system information. The malware employs various techniques for persistence, defense evasion, and data theft, including file system manipulation, registry modification, and clipboard operations. The campaign highlights the ongoing use of brand impersonation and social engineering for large-scale malware distribution, emphasizing the need for robust security measures and user awareness.
