RedVDS, a virtual dedicated server provider, has been utilized by multiple financially motivated threat actors for business email compromise, phishing, account takeover, and financial fraud. The service offers inexpensive Windows-based RDP servers with full administrator control, attracting cybercriminals worldwide. Microsoft's investigation revealed a global network targeting multiple sectors across various countries. RedVDS uses a single, cloned Windows host image, leaving unique technical fingerprints. The service operates through cryptocurrency payments and supports various digital currencies. Microsoft's analysis uncovered the infrastructure, provisioning methods, and tools deployed on RedVDS hosts, including mass mailers, email harvesters, privacy tools, and automation scripts.
A new Magecart network has been uncovered, targeting major payment networks including American Express, Diners Club, Discover, and Mastercard. The campaign, active since January 2022, uses web-skimming techniques to steal credit card information from online shoppers. The attackers inject malicious JavaScript code into compromised e-commerce websites, creating fake payment forms that capture and exfiltrate sensitive data. The skimmer employs sophisticated obfuscation techniques and mimics legitimate payment processes to avoid detection. Victims are unaware of the theft, as the malware allows the real transaction to proceed after capturing the data. The campaign demonstrates advanced knowledge of e-commerce platforms and continues to pose a significant threat to online retailers and consumers worldwide.
This analysis examines a multi-stage Windows malware campaign called SHADOW#REACTOR. The infection chain uses obfuscated VBS, PowerShell downloaders, and text-based payloads to deliver a Remcos RAT backdoor. Key features include fragmented text staging, .NET Reactor protection, reflective loading, and MSBuild abuse as a living-off-the-land binary. The campaign leverages complex obfuscation and in-memory execution to evade detection while establishing persistent remote access. Defensive recommendations focus on script execution monitoring, LOLBin abuse detection, and enhanced PowerShell logging to counter the sophisticated evasion techniques employed.
VoidLink is an advanced malware framework designed for Linux systems, focusing on cloud and container environments. It includes custom loaders, implants, rootkits, and modular plugins for long-term access. The framework employs a flexible architecture with a Plugin API inspired by Cobalt Strike. VoidLink uses multiple security mechanisms, including runtime code encryption and adaptive behavior based on the detected environment. Developed by Chinese-affiliated developers, it demonstrates high technical expertise across multiple programming languages. The framework includes cloud-focused capabilities, credential harvesting, and various command-and-control channels. While its intended use remains unclear, VoidLink appears to be positioned for potential commercial use.
In 2025, AI did not revolutionize cyber attacks as predicted. Instead, adversaries used AI to accelerate traditional tradecraft, focusing on speed and accessibility rather than new offensive capabilities. The article examines several case studies showcasing AI-generated scripts for credential theft and browser exploitation. These attacks, while faster and more accessible to less-skilled operators, still rely on familiar techniques detectable by basic security measures. The outlook for 2026 suggests continued AI-driven commoditization of tradecraft, with more templated attacks and improved phishing attempts. However, fundamental security practices remain effective against these evolving threats.
The Knownsec leak exposes a state-aligned Chinese cyber contractor deeply integrated with national security and intelligence operations. Internal documents reveal Knownsec's role in developing offensive cyber capabilities, large-scale reconnaissance systems, and data fusion platforms for public security bureaus and military clients. Key products include ZoomEye for global IP scanning, GhostX for exploitation, and Passive Radar for covert network mapping. The leak provides unprecedented insight into Knownsec's organizational structure, personnel, and strategic targeting of foreign critical infrastructure, particularly in Taiwan and other Asian countries. It demonstrates how commercial entities like Knownsec function as core components of China's cyber-espionage ecosystem, blending state objectives with industrial-scale development of intrusion and surveillance technologies.
CNCERT and Microstep Online jointly detected a cyberattack campaign launched by the "Black Cat" criminal gang. This gang uses search engine SEO (Search Engine Optimization) techniques to push meticulously crafted phishing websites to the top of search engine keyword results. After visiting these high-ranking phishing pages, users are lured by carefully designed download pages, attempting to download software installation packages bundled with malicious programs. Once installed, the program implants a backdoor Trojan without the user's knowledge, leading to the theft of sensitive data from their host computer by attackers.
The PHALT#BLYX campaign targets the hospitality sector using sophisticated social engineering and advanced techniques. It begins with a phishing email mimicking a Booking.com reservation cancellation, leading victims to a fake website. Users are tricked into executing malicious PowerShell commands through a fake BSOD and click-fix social engineering tactic. The malware leverages MSBuild.exe to bypass defenses and deploys a customized DCRat payload. It establishes persistence, disables Windows Defender, and uses process hollowing to inject into legitimate processes. The campaign shows evolution from earlier, simpler methods and demonstrates a deep understanding of modern endpoint protection. Attribution points to Russian-speaking threat actors, given the presence of Cyrillic debug strings and the use of DCRat, a popular tool in Russian underground forums.
The Boto Cor-de-Rosa campaign reveals Astaroth's new strategy of exploiting WhatsApp Web for propagation. This Brazilian banking malware now uses a Python-based worm module to retrieve victims' WhatsApp contact lists and automatically send malicious messages, expanding its infection reach. The attack begins with a malicious ZIP file sent via WhatsApp, containing a Visual Basic script that downloads additional components. The malware then operates two parallel modules: a propagation module for spreading through WhatsApp contacts, and a banking module for credential stealing. This campaign demonstrates Astaroth's evolution, combining traditional malware techniques with sophisticated social engineering and multi-platform propagation, primarily targeting Brazilian users.
MuddyWater APT group has launched a spearphishing campaign targeting various sectors in the Middle East, including diplomatic, maritime, financial, and telecom entities. The campaign employs icon spoofing and malicious Word documents to deliver a Rust-based implant dubbed 'RustyWater'. This new tool represents a significant upgrade from their traditional PowerShell and VBS loaders, offering capabilities such as asynchronous C2, anti-analysis features, registry persistence, and modular post-compromise expansion. The attack chain involves a malicious email with an attached document that triggers a multi-stage process, ultimately leading to the deployment of the RustyWater implant. This evolution in MuddyWater's toolkit demonstrates their adaptation to more sophisticated, structured, and stealthy attack methods.
UAT-7290, a sophisticated threat actor active since 2022, is targeting critical infrastructure entities in South Asia, particularly telecommunications providers. The group's arsenal includes malware families like RushDrop, DriveSwitch, SilentRaid, and Bulbature. UAT-7290 conducts extensive reconnaissance before intrusions, using one-day exploits and SSH brute force to compromise edge devices. The actor is believed to be a China-nexus APT, sharing similarities with APT10 and other known Chinese threat groups. UAT-7290 has recently expanded its targeting to Southeastern Europe and may establish Operational Relay Boxes for other China-nexus actors. Their malware suite primarily focuses on Linux systems but can also utilize Windows-based implants.
This analysis examines a sophisticated malware delivery chain that begins with a phishing email impersonating DocuSign. The attack employs multiple evasion techniques, including an access-code gate, time-based checks, and packing. The initial payload is a single-file .NET bundle with a valid code signing certificate. Static analysis revealed a second-stage native binary with additional obfuscation. The final payload is identified as Vidar malware. The investigation showcases the effectiveness of combining static and dynamic analysis tools to overcome advanced evasion tactics and reconstruct the full attack chain, from the initial phishing email to the final payload.
Three malicious npm packages were discovered in November 2025, designed to deliver and install a new RAT malware family named NodeCordRAT. The packages, bitcoin-main-lib, bitcoin-lib-js, and bip40, mimicked legitimate Bitcoin-related libraries to deceive developers. NodeCordRAT uses Discord for command-and-control communication, targets Chrome credentials, sensitive secrets, and MetaMask data. It performs host fingerprinting, executes shell commands, captures screenshots, and exfiltrates data. The malware exploits software supply chain vulnerabilities, highlighting the importance of vigilance in package management. Although removed from npm, the incident serves as a reminder of ongoing threats in the software development ecosystem.
Between February and September 2025, BlueDelta, a Russian state-sponsored threat group linked to the GRU, conducted multiple credential-harvesting campaigns. The group targeted individuals associated with energy research, defense cooperation, and government communication networks in Turkey, Europe, North Macedonia, and Uzbekistan. BlueDelta impersonated legitimate webmail and VPN services, using free hosting and tunneling services to host phishing content and capture user data. The campaigns incorporated PDF lures and customized JavaScript to increase authenticity and operational efficiency. This activity demonstrates BlueDelta's continued focus on low-cost, high-yield methods for collecting information supporting Russian intelligence objectives.
A malicious WordPress plugin named 'Modern Recent Posts' has been discovered, targeting administrators with fake browser update pop-ups. The plugin injects malicious JavaScript from an external domain, only affecting logged-in administrators on Windows machines. The campaign uses social engineering tactics to trick users into downloading potential malware. The plugin includes persistence mechanisms and can self-update. This sophisticated attack demonstrates a focused approach on high-value targets, leveraging trust in security updates to compromise local machines. The malware's stealthy nature and targeted delivery system make it particularly dangerous for WordPress site owners.
Threat actors are leveraging complex routing scenarios and misconfigured spoof protections to send phishing emails that appear to be internal communications. These attacks, which have increased since May 2025, use various lures like voicemails, shared documents, and password resets to conduct credential phishing and financial scams. The campaigns, often using PhaaS platforms like Tycoon2FA, are opportunistic and target multiple industries. While Microsoft detects most attempts, organizations can further mitigate risks by properly configuring spoof protections and third-party connectors. The attacks do not affect customers whose Microsoft Exchange MX records point to Office 365, as they are protected by built-in spoofing detections.
MuddyWater, an Iran-aligned cyberespionage group, has been targeting critical infrastructure in Israel and Egypt with custom malware and improved tactics. The campaign uses previously undocumented tools like the Fooder loader and MuddyViper backdoor to enhance defense evasion and persistence. Fooder masquerades as a Snake game and uses game-inspired techniques to hinder analysis. MuddyViper enables system information collection, file manipulation, and credential theft. The group also employs browser-data stealers and reverse tunneling tools. This campaign demonstrates MuddyWater's evolution towards more sophisticated and refined approaches, though traces of operational immaturity remain. The group continues to pose a significant threat, particularly to government, military, telecommunications, and critical infrastructure sectors in the Middle East.
DeedRAT is a sophisticated backdoor associated with the Chinese APT group Salt Typhoon, targeting critical sectors globally. It infiltrates systems through phishing campaigns, utilizing DLL sideloading to evade detection. The malware establishes persistence via registry run keys and service creation, ensuring long-term access. DeedRAT's capabilities include file manipulation, system reconnaissance, and payload execution. The infection chain involves three files: a legitimate executable, a malicious DLL, and an encrypted file. Once installed, it attempts to connect to its command-and-control server. Defensive measures include monitoring email traffic, registry changes, and anomalous service creations.
In 2025, there was a significant increase in rogue ScreenConnect installations, part of a broader trend of threat actors abusing remote monitoring and management tools (RMMs). These tools were used to gain access, blend in, move laterally, and maintain persistence in target systems. Attackers employed various social engineering tactics to trick employees into downloading malicious RMMs. Common lures included fake Social Security statements, invitations, and financial documents. The Huntress Security Operations Center identified recurring patterns in lures, domains, and file hashes associated with these attacks. Some campaigns showed signs of targeting specific industries, such as accounting firms. The article provides detailed examples of attack patterns, top malicious domains, and file hashes observed throughout the year.
Between December 19-22, 2025, EmEditor's official website suffered a security breach, causing the main download button to serve malicious software. The fake installer, signed by WALSHAM INVESTMENTS LIMITED, contained infostealer malware targeting login credentials, browser history, and VPN settings. It specifically targeted technical staff and government offices, stealing files and installing a fraudulent browser extension for remote control and cryptocurrency address swapping. Users who downloaded during this period are advised to check the digital signature, delete suspicious files, and change stored passwords. Emurasoft is investigating the incident and has apologized for the inconvenience.
