This threat involves a malware campaign using business-themed email lures to deliver XLoader and other payloads. The attack starts with emails containing RAR archives with obfuscated JScript files that extract and execute a LuaJIT interpreter and loader. The loader performs in-memory execution of the XLoader core via manual mapping and shared-section injection into target processes. The malware steals credentials including Windows Vault data and browser cookies and communicates with multiple command-and-control servers. Additional malware such as Agent Tesla, Remcos, and XWorm are also delivered in this campaign.
SiriusQT is a Windows Remote Access Trojan (RAT) distributed as Malware-as-a-Service since April 2026. It offers advanced capabilities including hidden VNC, credential theft, cryptocurrency wallet collection, clipboard monitoring, keylogging, process injection, and persistence. The malware uses custom encrypted command-and-control communication and has both native C++ and .NET loader variants. It is distributed primarily by a reseller named GhostKernel and targets victims in several European countries including the UK, Germany, France, Spain, Italy, and the Netherlands.
XWorm is a modular malware associated with the DDGroup cybercrime group. It uses multiple delivery methods such as phishing emails, drive-by downloads, exploit kits, USB drives, and RDP exploitation. The malware enables remote access, data theft including passwords and credit card information, ransomware deployment, spyware installation, and can cause system crashes and denial-of-service attacks. Its modular design and diverse attack vectors make it a persistent and multifaceted threat requiring continuous cybersecurity vigilance.
2CLoader is a newly identified malware loader active since August 2026 that delivers information stealers such as Vidar and Remus, as well as the XWorm RAT. It features advanced anti-analysis and evasion techniques, including anti-VM, anti-debug, indirect system calls via Hell's Gate, and inline trampoline hooks to bypass endpoint security. The loader protects its payloads with rolling XOR and AES-GCM encryption stored as PE resources and supports multiple execution methods. It communicates with command-and-control servers using encrypted JSON over HTTP POST and maintains persistence through registry keys, scheduled tasks, and startup folders.
Beginning in 2024, a financially motivated threat actor designated BREEZE COMET has conducted sophisticated operations targeting Brazilian financial services, retail, and eCommerce organizations. The group specializes in manipulating payment systems including Pix, STR, and Boleto to conduct fraudulent transfers worth tens of thousands of USD. Their evolved tactics leverage customized malware suites written in multiple languages including Rust, Nim, Golang, and Java, alongside compromised government websites for initial access and command and control. The threat actor demonstrates advanced capabilities by targeting banking software, payment APIs, and mTLS credentials while maintaining persistent access through multiple backdoors. Evidence indicates BREEZE COMET uses generative AI to accelerate malware development and script creation, suggesting potential expansion to other Latin American and African countries based on infrastructure replication observed in Nigeria, Paraguay, Ghana, and Venezuela.
An investigation into malware delivery infrastructure reveals an operator using GitHub repositories to stage malicious loaders and RAT payloads. Starting from commit metadata, researchers traced an email address to a compromised machine via stealer log databases. The infected workstation exposed a complete operational pipeline including multiple RAT families (AsyncRAT, DcRat, Remcos, XWorm), phishing templates impersonating Colombian government institutions, bulk email software, and commercial crypter services. The operator maintains delivery infrastructure across GitHub, Bitbucket, AWS S3, and DuckDNS for command-and-control. Phishing campaigns target Colombian organizations using judicial notification and traffic violation lures with password-protected archives. The investigation demonstrates how infrastructure analysis and operational security failures can expose entire malware production workflows beyond individual samples.
Aeternum is a C++ botnet loader utilizing the Polygon blockchain for command-and-control infrastructure instead of traditional centralized servers. Threat actors write encrypted and plaintext instructions directly to smart contracts, which infected devices query via public RPC endpoints. The malware implements weak PBKDF2HMAC/AES-GCM encryption with self-salting passwords, allowing payload decryption using only the smart contract address. Analysis reveals three related samples: the core Aeternum loader with Telegram-based exfiltration, a blended threat combining XWorm RAT with XMRig cryptocurrency miner, and Python source code revealing anti-analysis checks and cryptocurrency wallet targeting. The botnet demonstrates resilience through decentralized infrastructure, making traditional law enforcement takedowns significantly more challenging while maintaining low operational costs for attackers.
Cruciferra is a sophisticated crypter service utilized by multiple unrelated cybercriminal threat clusters to deliver remote access trojans and infostealers. Written in Mono, it employs extensive defense-evasion capabilities including indirect system calls, API unhooking, BYOVD-based EDR tampering, privilege escalation, and customized Process Ghosting for payload execution. The service features over 90 variations of cryptographic functions to obfuscate data and payloads, complicating static analysis and signature-based detection. Cruciferra was first advertised in fall 2025 with pricing tiers ranging from $450 to $2000 monthly. It has been observed in campaigns delivering various malware families including zgRAT, AgentTesla, AsyncRAT, XLoader, XWorm, Phantom Stealer, Formbook, and Remcos, primarily targeting financial services, healthcare, and government entities through opportunistic email-based attacks.
Since late March 2026, a large-scale phishing campaign has been deploying malware including Agent Tesla, Remcos, XWorm, and Best Private LOGGER through fileless techniques and low-detection Lua-based loaders. Attackers impersonate well-known companies using business cooperation lures to distribute malicious archives containing obfuscated JavaScript files. These scripts deploy either AutoIt or LuaJIT interpreters alongside disguised scripts masquerading as TrueType Font (.ttf) files. The Lua loaders employ sophisticated anti-analysis techniques including custom ROT ciphers, decoy memory allocation, and Donut shellcode generation for reflective in-memory payload execution. The campaign evolved from simpler implementations in October 2025 to highly complex versions by June 2026, incorporating API unhooking and advanced debugging countermeasures. Victims are ultimately infected with Remote Access Trojans and infostealers that enable full system control and extensive data exfiltration.
Group-IB analyzes Millenium RAT version 4.*, a remote access trojan that has undergone significant architectural changes from .NET to native C++, while continuing to leverage Telegram Bot API for command and control without requiring dedicated server infrastructure. The malware is distributed as Malware-as-a-Service by developer 'ShinyEnigma' for $50-90 USD. Active exploitation campaigns are conducted by threat actor cluster 'Y2K Operators' using social engineering tactics including fraudulent utilities, hacking toolkits, software cracks, gaming lures, and trojanized cybercrime tools. The trojan enables exfiltration of sensitive browser and system data, screenshot and audio capture, keylogging, and arbitrary executable downloads. Over 62,000 compromised endpoints across more than 160 countries have been identified, with 39,730 infections occurring in Q1 2026 alone, demonstrating accelerating infection rates.
A sophisticated phishing campaign was identified distributing multiple malware families through a multi-stage loader utilizing steganography and fileless techniques. The infection chain begins with archive attachments containing files disguised as financial documents, primarily targeting Indian organizations using names related to GST, NEFT, RTGS, and IMPS transactions. The loader employs in-memory execution to avoid disk-based artifacts and uses embedded .NET Bitmap objects to conceal payloads. Various malware families have been deployed including Remcos RAT, Agent Tesla, MassLogger, Phantom Stealer, Dark Cloud, Red Line Stealer, Snake keyloggers, Formbook, and xworm. The final payloads establish persistence through registry Run keys, perform process hollowing, steal browser credentials, record audio and webcam, and exfiltrate data to command-and-control infrastructure. The campaign exhibits characteristics of a loader-as-a-service operation serving multiple threat actors globally.
A multi-stage malware delivery campaign was uncovered, initially detected through a suspicious VBS file. The investigation revealed a complex attack infrastructure using Unicode obfuscation, PNG-based payload staging, and reflectively loaded .NET execution. The attacker utilized open directories to host multiple obfuscated VBS files, each mapping to different malware payloads including XWorm and Remcos RAT. A secondary infection vector involving a weaponized 'PDF' and batch script was also discovered. The campaign demonstrated a modular approach, allowing for payload rotation and multiple attack vectors from the same domain. This sophisticated infrastructure design enables rapid modification and expansion of available payloads without altering the initial delivery mechanism.
TA584, a prominent initial access broker targeting organizations globally, demonstrated significant changes in attack strategies throughout 2025. The actor expanded its global targeting, adopted ClickFix social engineering techniques, and began delivering new malware called Tsundere Bot. TA584's operational tempo increased, with monthly campaigns tripling from March to December. The actor uses various delivery methods via email, often sending from compromised individual accounts. TA584's campaigns now feature rapid succession and overlapping, with distinct lure themes and short operational lifespans. The actor has shown adaptability in social engineering, brand impersonation, and payload delivery, making static detection less effective. Recent payloads include XWorm with the 'P0WER' configuration and the newly observed Tsundere Bot, both likely part of Malware-as-a-Service offerings.
The Brazilian Caminho loader is a sophisticated malware delivery mechanism active since March 2025, leveraging LSB steganography to hide . NET payloads within images hosted on legitimate platforms. It initiates infection via phishing emails containing malicious scripts that download these steganographic images. The loader executes payloads filelessly in memory and establishes persistence using scheduled tasks. Caminho operates as a Loader-as-a-Service, delivering multiple malware families such as Remcos RAT, Xworm, and Katz stealer across South America, Africa, and Eastern Europe. Its use of bulletproof hosting and Portuguese language artifacts indicates a Brazilian origin and professional operation. The campaign targets multiple industries opportunistically without a specific sector focus. The infection chain employs multiple advanced techniques including fileless execution, steganography, and obfuscation, complicating detection and mitigation efforts. European organizations, especially in Eastern Europe, face risks of data theft, espionage, and system compromise. Mitigation requires targeted email security, memory scanning, and monitoring of scheduled tasks for persistence.
Since the release of XWorm V6.0 on June 4, 2025, we have noted a surge in samples identified as XWorm V6.0 on VirusTotal, reflecting its rapid adoption by threat actors. One prominent campaign illustrates its delivery: a malicious JavaScript (JS) file initiates a PowerShell (PS1) script, which deploys an injector to deliver the XWorm Client.
This analysis details a sophisticated multi-stage attack delivering the XWorm RAT. The campaign begins with a phishing email containing a malicious .xlam file. The file harbors embedded shellcode that, when executed, retrieves a secondary payload. This payload is a .NET binary that reflectively loads a DLL into memory. The DLL, heavily obfuscated and encrypted, injects another DLL using reflective injection. The final stage involves process injection into the main executable, establishing persistence and exfiltrating data to Command & Control servers associated with the XWorm family. The attack chain demonstrates advanced evasion techniques, including the use of shellcode, steganography, and multiple stages of reflective DLL injection.
A sophisticated malware campaign has been uncovered that utilizes various techniques to deliver Remote Access Trojans (RATs) such as XWorm and Remcos. The attack chain begins with a ZIP archive, often hosted on trusted platforms like ImgKit, containing obfuscated BAT scripts. These scripts execute PowerShell-based loaders that inject RAT payloads directly into memory, enabling fileless execution. The campaign also employs SVG files with embedded JavaScript to trigger the malware download, exploiting non-traditional file formats to evade detection. The infection process involves multiple stages, including persistence mechanisms, PowerShell script execution, and the use of loaders to decrypt and deploy the final payload. This evolving threat landscape highlights the need for advanced security measures to counter such sophisticated attacks.
Insikt Group has identified five distinct activity clusters linked to TAG-144 (Blind Eagle), targeting primarily Colombian government entities across local, municipal, and federal levels throughout 2024 and 2025. The clusters share similar tactics, techniques, and procedures (TTPs) such as using open-source and cracked remote access trojans (RATs), dynamic domain providers, and legitimate internet services (LIS) for staging. However, they differ in infrastructure, malware deployment, and operational methods. The group maintains an extensive operational infrastructure, employs various RATs, and uses multi-stage infection chains. TAG-144's primary focus appears to be credential theft and espionage, with evidence linking it to Red Akodon and compromised Colombian government email accounts used in spearphishing campaigns.
A new version of XWorm malware (version 6.0) has been discovered, showcasing advanced features for persistence and evasion. The infection chain begins with a VBScript that downloads and executes a PowerShell script. This script implements an AMSI bypass by modifying CLR.DLL in memory, then downloads and loads the XWorm binary. The latest version includes the ability to run as a critical process, preventing termination without admin privileges. It also introduces new anti-analysis techniques, such as terminating on Windows XP and detecting execution in data centers or hosting providers. The malware maintains its in-memory execution and continues to employ various evasion techniques.
A wide-ranging phishing campaign has been identified that enables threat actors to bypass traditional security controls and delay detection. The campaign, tracked since 2024, has facilitated remote surveillance, credential theft, lateral movement, data exfiltration, and ransomware across numerous organizations. The likely new or rebranded cybercriminal group behind this campaign uses legitimate services like TryCloudflare to host and deliver highly evasive malware such as AsyncRAT and other Remote Access Trojans. This malware allows threat actors to remotely control infected networks throughout the full attack lifecycle. The campaign targets organizations globally across multiple sectors without industry preference, using widely available malware and difficult-to-detect techniques involving Python scripts, obfuscated batch scripts, trusted cloud services, and dynamic infrastructure.
