Threats Tagged 't1115'

A sophisticated phishing campaign distributes a PureLogs variant through deceptive purchase order emails containing malicious JavaScript files. The attack chain employs obfuscated JavaScript that drops PowerShell scripts, which then use process hollowing techniques to inject .NET modules into legitimate Windows processes. The malware communicates with command-and-control infrastructure to download additional plugins. PureLogs collects extensive sensitive information including credentials from web browsers, cryptocurrency wallets, email clients, Discord, and various applications. It also captures screenshots, system information, and clipboard data. The collected data is compressed, encrypted with AES, and exfiltrated to remote servers. The campaign demonstrates advanced evasion techniques through fileless execution, multiple encryption layers, and abuse of trusted processes like MsBuild.exe, making detection challenging for traditional security solutions.

An MDR investigation successfully mapped the complete operational infrastructure of Banana RAT, a Brazilian banking trojan operated by threat cluster SHADOW-WATER-063. The investigation uncovered both server-side and client-side components, revealing a sophisticated FastAPI-based polymorphic payload generation system that produces hash-unique builds to evade detection. The malware employs layered obfuscation, AES-wrapped payloads, and fileless PowerShell execution. Once deployed, it enables operator-driven fraud through remote input control, keylogging, screen streaming, bank-branded overlays, and Pix QR code interception specifically targeting Brazilian financial institutions. The tooling exclusively targets 16 Brazilian banks and crypto exchanges, with all operator artifacts written in Brazilian Portuguese, indicating a financially motivated actor operating within the Tetrade banking trojan ecosystem.

This analysis examines new obfuscation techniques employed by Gremlin stealer malware to conceal malicious payloads within embedded resources. A variant protected by sophisticated commercial packing utility uses instruction virtualization, transforming code into custom bytecode executed by a private virtual machine. The malware siphons sensitive information including payment card details, browser cookies, session tokens, cryptocurrency wallet data, and FTP/VPN credentials from compromised systems. It exfiltrates data to attacker-controlled servers at hxxp[:]194.87.92[.]109 for potential publication or sale. Recent iterations incorporate expanded Discord token extraction, active financial fraud through crypto clipper functionality that replaces cryptocurrency wallet addresses in real-time, and WebSocket-based session hijacking to bypass modern cookie protections. The malware employs advanced anti-analysis techniques including XOR-encoded payloads in .NET resource sections, identifier renaming, string encryp...

North Korea-aligned APT group ScarCruft executed a multiplatform supply-chain attack targeting ethnic Koreans in China's Yanbian region, an area significant for North Korean refugees and defectors. Since late 2024, the group compromised a video gaming platform dedicated to Yanbian-themed games, trojanizing both Windows and Android components with the BirdCall backdoor. The Windows client received malicious updates leading to RokRAT and subsequently BirdCall deployment, while Android games were directly trojanized. This marks the first discovery of Android BirdCall, capable of comprehensive surveillance including data collection, screenshots, and voice recording. The campaign focuses on espionage against individuals of interest to the North Korean regime, particularly refugees and defectors.

KarstoRAT is a newly identified remote access trojan that emerged in early 2026, combining surveillance, credential theft, and remote command execution capabilities. The malware supports extensive post-compromise operations including system reconnaissance, screenshot and audio capture, webcam monitoring, keylogging, and token theft. It communicates with a C2 server at 212.227.65[.]132 using HTTP protocols with the user agent 'SecurityNotifier'. Distribution occurs through gaming-themed lure pages targeting Roblox players and FPS/GTA modders via fake cheat loaders. KarstoRAT employs multiple persistence mechanisms through registry keys, scheduled tasks, and startup folders, while featuring a UAC bypass using the fodhelper.exe technique. The malware has not been publicly advertised on cybercrime forums, suggesting private development and limited operator use rather than commodity distribution.

The Silver Fox threat group conducted phishing campaigns in December 2025 and January 2026, impersonating tax authorities in India and Russia. Malicious emails contained archives with a modified Rust-based RustSL loader that deployed ValleyRAT backdoor. Over 1600 malicious emails targeted organizations across industrial, consulting, retail, and transportation sectors. During investigation, a previously undocumented Python-based backdoor named ABCDoor was discovered, active since late 2024. The attacks utilized multi-stage infection chains involving encrypted payloads, custom ValleyRAT modules, and various persistence mechanisms including Phantom Persistence technique. ABCDoor features remote control capabilities, screen broadcasting using ffmpeg, and file manipulation functions. The group employed sophisticated evasion techniques including geofencing, string encryption, and mimicking legitimate VPN services.

MediumMalwareRussiaIndiaBritish Indian Ocean Territory+3#python backdoor#silver fox#winos 4.0

A malicious Chrome extension impersonating Google's Authenticator application has been identified as part of an ongoing campaign active since early 2026. The extension requests excessive permissions and contains dormant infrastructure suggesting a staged deployment model where malicious updates can be delivered without requiring further user approval. This extension is linked to at least six others through a shared developer front, with two already carrying fully operational malicious payloads. These extensions utilize hidden iframes to inject attacker-controlled content, deploy fraudulent paywalls for free services, and maintain bidirectional communication with command and control servers. The infrastructure maps directly to the AiFrame campaign, which has reportedly compromised over 260,000 users from 2025 to present, marking a continued evolution of this threat.

On April 11, 2026, researchers analyzed a CHM file (api_reference.chm) tagged as Kimsuky that initiated a three-stage attack chain. The C2 server at check[.]nid-log[.]com had directory listing enabled, allowing recovery of complete source code for all payload stages: a 6,338-byte VBScript performing system reconnaissance and establishing persistence via scheduled task, a 449-byte VBScript bridge to PowerShell, and a 6,234-byte PowerShell keylogger with clipboard monitoring and timed exfiltration. The infrastructure included 79+ domains across 5 C2 IPs spanning Korean VPS providers. The server responded with "Million OK !!!!" signature, matching previously documented Kimsuky infrastructure while showing upgraded Apache/PHP stack. The operation targeted Korean Naver users through credential phishing and tax authority impersonation, with infrastructure linked to previously documented Kimsuky campaigns via shared DAOU Technology subnets.

An open directory discovery at refundonex[.]com exposed a complete Phishing-as-a-Service and RAT-as-a-Service platform targeting Spanish and Portuguese-speaking victims. The investigation uncovered 3,788 files including weaponized LNK, VBS, and AES-encrypted PowerShell payloads delivering a remote access trojan. The platform, called Shadow Panel, operates from Bulgarian infrastructure and offers capabilities including remote shell execution, screenshot capture, file management, browser credential theft, clipboard hijacking for cryptocurrency wallets, and multi-operator support. The C2 panel's frontend JavaScript was publicly accessible, revealing 29 API endpoints and the complete architecture. Infrastructure analysis linked the operation to nikola4010@proton[.]me through WHOIS data and historical malicious domain associations dating back to 2021, indicating a long-running cybercriminal operation with minimal detection coverage.

Operation DualScript is a sophisticated multi-stage malware campaign targeting cryptocurrency and financial activities. It utilizes Windows Scheduled Tasks, VBScript launchers, and PowerShell execution to maintain persistence while minimizing disk artifacts. The attack operates through two parallel chains: a web-based PowerShell loader deploying a cryptocurrency clipboard hijacker, and a secondary chain executing the RetroRAT implant in memory. RetroRAT monitors user activity, captures keystrokes, and tracks interactions with financial services to harvest sensitive information. The malware employs various anti-analysis techniques and establishes a command-and-control channel for remote access and data exfiltration. This campaign highlights the growing abuse of trusted system utilities and in-memory execution techniques to evade traditional detection mechanisms.

MediumMalwareUnited StatesRussiaChina+7#cryptocurrency#retrorat#multi-stage