Threats Tagged 'multi-stage'

LokiBot, an infostealer first advertised in May 2015, continues to operate after more than a decade with numerous variants. The malware targets credentials from over a hundred software products including browsers, cryptocurrency wallets, password managers, email and FTP clients. A recent campaign delivers LokiBot through malspam with JScript email attachments, executing a multi-stage infection chain involving PowerShell loaders and .NET injectors protected by ConfuserEx. The final payload uses process injection into aspnet_compiler.exe, employing API hashing techniques to evade detection. While LokiBot maintains extensive credential theft capabilities, recent samples exhibit broken persistence mechanisms due to patched decryption subroutines. The malware communicates with C2 servers to exfiltrate compressed stolen data and await further commands, demonstrating continued evolution despite reduced activity in recent years.

A sophisticated malware campaign targeting WhatsApp users has been observed since February 2026. The attack chain begins with malicious Visual Basic Script files sent via WhatsApp messages, which, when executed, initiate a multi-stage infection process. The malware uses renamed Windows utilities, retrieves payloads from trusted cloud services, and installs malicious MSI packages. The campaign employs social engineering, stealth techniques, and cloud-based payload hosting to establish persistence and escalate privileges on victim systems. The attackers utilize legitimate tools and trusted platforms to reduce visibility and increase the likelihood of successful execution. The final stage involves the delivery of unsigned MSI installers that enable remote access to compromised systems.

MediumCampaignUnited StatesIndiaBrazil+10#cloud-based#social-engineering#uac-bypass

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

A sophisticated phishing campaign impersonating Tesseract OCR was discovered, utilizing typosquatting and ClickFix techniques. The attack chain, named OCRFix, employed multi-stage malware deployments with heavy obfuscation and defense evasion techniques, including EtherHiding. The campaign used BNB Smart Chain TestNet to hide C2 domains through smart contracts. The malware delivery process involved three stages: a loader, a secondary loader for persistence, and a bot listener. The final payload connected to a bot control panel, allowing attackers to manage infected hosts and deploy additional malware. The campaign demonstrated a combination of simple initial access methods with complex delivery chains, highlighting the ongoing effectiveness of techniques like ClickFix and the importance of robust phishing defenses.

MediumMalwareUnited StatesChinaIndia+10#ocrfix#etherhiding#typosquatting

An exposed open directory on a command and control server revealed a complete deployment of the BYOB (Build Your Own Botnet) framework. The multi-stage infection chain targets Windows, Linux, and macOS platforms, implementing seven persistence mechanisms. The malware includes extensive post-exploitation capabilities such as keylogging, packet capture, and email harvesting. Analysis uncovered a modular design with encrypted C2 communications and infrastructure reuse across multiple regions. Two nodes also hosted XMRig cryptocurrency miners, indicating additional monetization efforts. The campaign has been operational for approximately 10 months, demonstrating geographic and provider diversification in its infrastructure.

MediumMalwareGermanyFranceUnited Kingdom+4#persistence#cryptomining#byob

A sophisticated multi-stage malware campaign targeting Windows users in Russia has been identified. The attack chain begins with social engineering lures and progresses to a full system compromise, including security bypass, surveillance, and ransomware delivery. It abuses Defendnot to disable Microsoft Defender and uses modular hosting across cloud services. The attack employs various techniques such as PowerShell scripts, obfuscated VBScript, and COM object manipulation. It deploys Amnesia RAT for data theft and surveillance, Hakuna Matata ransomware for file encryption, and a WinLocker component for system lockout. The campaign demonstrates how full system compromise can be achieved without exploiting software vulnerabilities, instead relying on social engineering and abuse of legitimate Windows features.

MediumCampaignRussiaGermanyFrance+4#hakuna matata#ransomware#defendnot

A sophisticated spear-phishing campaign targeting Argentina's judicial sector has been uncovered. The operation uses a multi-stage infection chain to deploy a stealthy Remote Access Trojan (RAT). Attackers exploit trust in court communications by using authentic-looking judicial decoy documents. The campaign employs a weaponized LNK file, a BAT-based loader script, and a covert Rust-based RAT to establish persistent access within judicial environments. The malware performs extensive anti-VM and anti-debug checks, collects system information, and establishes resilient C2 connections. It supports various malicious activities including persistence, file transfer, data harvesting, encryption, and privilege escalation. The campaign demonstrates high operational sophistication and aims to gain long-term access to sensitive legal and institutional data.

MediumMalwareArgentinaSpainItaly+3#argentina#spear-phishing#multi-stage

CastleLoader is a sophisticated malware loader designed to deliver and install malicious components, primarily targeting government entities and critical infrastructure. It employs a multi-stage execution chain involving Inno Setup, AutoIt, and process hollowing to evade detection. The loader delivers information stealers and RATs, enabling credential theft and persistent access. The analysis reveals its stealthy nature, relying on memory-only payloads and API resolution via hashing. The malware's configuration, including C2 infrastructure, was extracted through reverse engineering, providing high-confidence indicators of compromise for detection and analysis.

MediumMalwareGermanyFranceUnited Kingdom+3#castleloader#memory-only#loader

A malicious Visual Studio Code extension named 'prettier-vscode-plus' was discovered on the official VSCode Marketplace, impersonating the legitimate Prettier formatter. This extension served as the entry point for a multi-stage malware chain, starting with the Anivia loader, which decrypted and executed further payloads in memory. The final stage, OctoRAT, is a comprehensive remote access toolkit providing over 70 commands for surveillance, file theft, remote desktop control, persistence, privilege escalation, and harassment. The attack chain employs sophisticated techniques like AES encryption, process hollowing, and UAC bypass. The threat actor's GitHub repository showed active payload rotation to evade detection. This supply-chain attack highlights the evolving threats targeting developers and the abuse of trusted tools in their ecosystem.

MediumMalwareGermanyFranceUnited Kingdom+4#extension#remote-access-toolkit#supply-chain

A multi-stage malware execution chain originating from a ClickFix lure has been discovered, leading to the delivery of infostealing malware like LummaC2 and Rhadamanthys. The campaign utilizes steganography to hide malicious code within PNG images. Two distinct ClickFix lures were observed: a standard 'Human Verification' and a convincing fake Windows Update screen. The execution chain involves mshta.exe, PowerShell, and .NET assemblies, ultimately extracting and injecting shellcode into target processes. The steganographic technique encodes malicious data directly into image pixel data, using specific color channels for payload reconstruction and decryption in memory. This sophisticated approach helps evade signature-based detection and complicates analysis.

MediumMalwareGermanyFranceUnited Kingdom+5#multi-stage#social engineering#steganography