BITTER is a cyberespionage group targeting South Asian government, energy, and engineering sectors using a custom remote access trojan called PapRAT. PapRAT is deployed through multiple infection chains involving malicious LNK files, VHDX disk images with MSI installers, and URL shortcuts combined with WebDAV. The malware exists in C++ and Rust variants, with capabilities such as command execution, file and directory manipulation, screenshot capture, and secondary payload delivery. Persistence is maintained via scheduled tasks, and communication with command-and-control servers occurs over HTTP. The Rust variant adds enhanced features including PowerShell execution and sleep commands.
DarkCore is a remote access trojan (RAT) that steals credentials and hijacks user sessions by reusing stolen session cookies to access services like Gmail and WhatsApp. It routes traffic through victims' IPs to mimic legitimate activity and includes hidden virtual network computing (HVNC) for stealthy desktop access. Distributed via PDF-themed shortcuts that deliver decoy documents alongside malware, DarkCore communicates with its command-and-control servers over TCP and can load additional modules dynamically.
Hirudo is an Android banking remote access trojan that combines credential theft with live remote control capabilities. It is distributed via shopping and entertainment apps acting as droppers, which install the trojan behind fake update prompts. The malware replaces legitimate banking apps with patched versions that disable internal security checks. The campaign targets eight Indonesian banking apps covering seven banks, embedding a hooking engine in the replacements. Distribution uses legitimate advertising infrastructure including Amazon CloudFront. Targeting extends beyond Indonesia to China, India, Mexico, Morocco, Thailand, and Malaysia. Backend data from August 2026 revealed thousands of stolen credentials and device records. No CVE or official patch information is available.
SectopRAT (also known as ArechClient2) is a .NET-based remote access trojan (RAT) that provides a range of functions through multiple control commands. These include collecting sensitive data from the victim’s device, capturing screens, remotely managing processes and files, controlling bots, and other forms of remote device management.
A new ClickFix campaign targets Windows users with a NodeJS-based infostealer delivered via malicious MSI installers. This highly adaptable remote access Trojan minimizes forensic footprints through dynamic capability loading, with core stealing modules and communication protocols delivered in-memory only after C2 connection. The malware routes gRPC streaming traffic over Tor network for persistent, masked bidirectional channels. An operational security failure exposed server-side admin panel protocol definitions, revealing a malware-as-a-service backend designed to manage multiple operators and automate cryptocurrency asset tracking. The modular architecture delivers malicious logic dynamically as strings executed in-memory, bypassing static signature detection while supporting full RAT functionality including shell command execution and wallet tracking.
BlueShell is an open-source remote access trojan developed in Go language, primarily used by Chinese-based threat actors. A variant of BlueShell has been identified in post-intrusion activities by APT groups including BlackTech, targeting organizations in Japan, South Korea, and Thailand. This variant differs from the original through a dedicated dropper mechanism, proxy server-based C2 communication, and anti-forensic capabilities. The dropper deploys the variant to /tmp/kthread, disguises it as a Linux kernel worker process, and removes filesystem traces. Recent variants observed since 2024 include XOR-encoded configuration data and proxy functionality, indicating continuous development. The malware performs hostname verification, validates C2 certificates, and implements commands for file transfer, remote shell, and SOCKS5 proxy capabilities.
A newly discovered Windows stealer and remote access trojan called Dolphin X targets over 300 applications including browsers, cryptocurrency wallets, password managers, and cloud command-line tools. The malware collects credentials ranging from browser logins to SSH keys, .env files, and cloud tokens. A distinctive feature called the AI Profiler automatically scores infected victims based on application usage, browsing activity, and installed software, helping attackers identify high-value targets through daily summaries. The malware builder operates through a remote server that compiles agents and offers optional mutation engines to evade detection. Advertised by a vendor using the alias Kontraktnik, Dolphin X poses significant risk to developers and organizations by potentially exposing access to entire production environments through compromised DevOps credentials.
A sophisticated supply chain attack leverages typosquatting of the legitimate postcss-selector-parser npm package, which receives over 150 million weekly downloads. Three malicious packages published by user 'abdrizak' masquerade as PostCSS utilities while delivering a multi-stage Windows RAT. The infection chain begins with encoded JavaScript that drops PowerShell scripts, which then download a bundled Python runtime containing Nuitka-compiled modules. The final payload implements comprehensive RAT capabilities including HTTP C2 communication with RC4 encryption, registry persistence, VM detection, remote shell execution, file transfer, and Chrome credential theft using DPAPI and app-bound decryption. The attack demonstrates how build tooling dependencies can serve as delivery mechanisms for sophisticated Windows malware targeting developer environments.
SideCopy, also tracked as APT36 or Transparent Tribe, has launched a new attack campaign targeting Indian defense personnel using a fake 'Minutes Of Meeting' document as lure. The attack employs an identical playbook to previous operations: a double-extension Minutes Of Meeting.docx.lnk file executes a PowerShell stager (pdfdocs.bat) from a nested pdfdocs folder while displaying a clean decoy document. The chain deploys a Remote Access Trojan (pdfdocs) that establishes persistence through the HKCU Run key. The staged components demonstrate low detection rates at initial delivery, with the decoy document scoring 0/66, the stager 1/61, and only the final executable reaching 35/71 detections.
Through April 2026, Kimsuky deployed sophisticated malicious campaigns against South Korean military and corporate entities using tailored social engineering tactics including fake security software installation pages and spoofed Webex meeting pages leveraging legitimate meeting schedules. The threat actor introduced a novel JSONPing technique allowing distribution pages to verify in real time whether victims executed the payload via JSONP queries to localhost servers. Analysis revealed a new HttpSpy variant with a three-stage execution chain replacing the previous single-binary architecture, utilizing RC4 encryption and shared infrastructure indicators. Attribution was confirmed through code pattern overlaps, reused encryption keys, XAMPP certificate fingerprints, and preferred ASN usage consistent with historical Kimsuky operations targeting South Korea.
Beginning in late September 2025, multiple affected hosts were observed making requests to domains impersonating content delivery networks (CDNs), including infrastructure masquerading as Yahoo- and Apple-affiliated services. Across these cases, Darktrace identified a consistent behavioral execution pattern: the retrieval of legitimate binaries alongside malicious Dynamic Link Libraries (DLLs), enabling sideloading and execution of a modular .NET-based Remote Access Trojan (RAT) framework.
Mirax is a newly identified Android Remote Access Trojan operating as Malware-as-a-Service, actively targeting European users, particularly in Spanish-speaking regions. Distributed through Meta advertisements and GitHub-hosted droppers, the malware has reached over 200,000 accounts. It employs sophisticated techniques including dynamically fetched HTML overlays, comprehensive keylogging, and remote device control capabilities. A distinctive feature is its integration of SOCKS5-based residential proxy functionality, transforming infected devices into proxy nodes that enable attackers to route traffic through legitimate residential IP addresses. This capability allows operators to bypass geolocation restrictions and evade fraud detection systems while conducting account takeovers and transaction fraud. The malware uses commercial-grade obfuscation through Golden Encryption and establishes persistence through Accessibility Service abuse.
A supply chain attack targeting the Axios npm package has been identified after threat actors compromised the npm account of the company's lead developer. Malicious versions (axios@1.14.1 and axios@0.30.4) were published containing a hidden dependency that executed postinstall scripts during npm installation. This automated execution downloaded and deployed a remote access trojan on affected systems without requiring user interaction, making it particularly dangerous for developer environments and CI/CD pipelines. The compromise resulted in full remote access capabilities, potential credential exposure including API keys and SSH keys, and possible insertion of malicious code into software builds. Detection platforms identified suspicious process execution chains involving npm spawning command interpreters and network utilities, followed by outbound connections to attacker-controlled infrastructure.
A North Korean threat operation has published malicious packages across npm, PyPI, Go Modules, crates.io, and Packagist, impersonating legitimate developer tooling. The campaign uses GitHub aliases including golangorg and aokisasakidev to distribute staged malware loaders that contact actor-controlled infrastructure, retrieve payloads from Google Drive, and deliver platform-specific second-stage malware. The loaders are hidden behind normal-looking API functions in logging and utility libraries. Windows variants include full remote access trojans with capabilities for shell execution, keylogging, browser and wallet theft, sensitive file collection, and AnyDesk deployment. The operation demonstrates coordinated cross-ecosystem supply chain attacks with shared infrastructure patterns, reused extraction directories, and consistent staging logic across multiple programming languages.
This multi-stage fileless Remcos RAT attack leverages a phishing-delivered JavaScript dropper to trigger a reflective PowerShell loader that executes payloads entirely in memory. The infection chain utilizes obfuscation techniques like rotational XOR and Base64 encoding to reconstruct .NET payloads, significantly reducing the disk-based detection footprint. Stealth is maintained by using aspnet_compiler.exe as a LOLBin to proxy malicious execution and dynamically retrieving the final payload from a remote C2 server.
In March 2026, a new MaaS active campaign was discovered promoting previously unknown malware in private Telegram chats. The Trojan features an extensive arsenal of capabilities. On the panel provided to third‑party actors, in addition to the standard features of RAT‑like malware, a stealer, keylogger, clipper, and spyware are also available.
CrySome is a sophisticated .NET-based remote access trojan designed for persistent command-and-control operations. It features advanced persistence mechanisms, including recovery partition abuse and offline registry modification, allowing it to survive system resets. The malware incorporates an aggressive defense evasion module, disabling security products and blocking updates. Key capabilities include command execution, file operations, surveillance, credential theft, and hidden virtual desktop control. CrySome's modular architecture and structured packet-based protocol enable a wide range of remote operations. Its emphasis on stealth, resilience, and comprehensive system control makes it a significant threat for long-term covert access to compromised environments.
TeamPCP uploaded malicious versions of the telnyx Python SDK to PyPI, compromising a package with 750,000 monthly downloads. The attack uses a three-stage architecture: a trojanized package triggers a platform-specific loader, which downloads a second-stage payload hidden in a WAV file using steganography, deploying a credential harvester. The harvester steals various credentials, encrypts them, and exfiltrates to the attacker's C2. The attack works across major operating systems and spreads through Kubernetes clusters. This is part of a broader TeamPCP supply chain campaign that has targeted multiple packages over nine days. The sophisticated attack includes WAV and PNG steganography, hybrid encryption, Kubernetes lateral movement, and a full-featured RAT on Windows with advanced evasion techniques.
The Konni Group conducted a sophisticated multi-stage attack campaign, initiating with a spear-phishing email disguised as a North Korean human rights lecturer appointment. The attack progressed through execution of a malicious LNK file, installation of remote access malware, and long-term persistence for data theft. A key feature was the unauthorized access to victims' KakaoTalk PC applications, used to distribute additional malicious files to selected contacts. The campaign employed multiple RAT families, including EndRAT, RftRAT, and RemcosRAT, with a distributed C2 infrastructure across Finland, Japan, and the Netherlands. The threat actor's tactics included trust-based propagation, account session abuse, and modular payload deployment, highlighting the need for advanced behavior-based detection and multi-layered defense strategies.
BeatBanker is a sophisticated Android malware campaign targeting Brazil. It spreads through phishing attacks using a fake Google Play Store website. The malware combines a cryptocurrency miner and a banking Trojan capable of hijacking devices and overlaying screens. It employs creative persistence mechanisms, including playing an inaudible audio loop. BeatBanker monitors device status, disguises itself as legitimate apps, and targets cryptocurrency transactions on Binance and Trust Wallet. Recent variants have replaced the banking module with the BTMOB remote administration tool, expanding its capabilities. The threat demonstrates advanced evasion techniques, uses Firebase Cloud Messaging for command and control, and targets multiple browsers for data collection. Victims are primarily located in Brazil, with some samples spreading via WhatsApp.
