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Security researchers reported a multi-stage Windows malware campaign dubbed Shadow#Reactor (SHADOW#REACTOR) that uses a VBScript launcher and PowerShell to retrieve fragmented, text-only payloads from remote infrastructure, then reconstructs and executes them to ultimately deploy Remcos RAT. The infection chain relies on user interaction (e.g., phishing/social-engineering lures or compromised web resources) to execute an obfuscated .vbs file via Windows Script Host, after which staged PowerShell downloaders pull encoded payload pieces that are stored as plain text to reduce the likelihood of traditional binary-based detections.
Securonix analysis (as reported in both trade and vendor writeups) describes a modular handoff between stages, including obfuscation layers, base64 decoding patterns, and integrity/size checks to ensure successful reassembly of the final components. The technique emphasizes living-off-the-land execution and flexible staging (allowing attackers to update individual stages independently), with reconstruction activity leveraging legitimate tooling (e.g., MSBuild noted in reporting) before in-memory decoding and retrieval of the final Remcos payload; defenders should treat unusual chains of wscript.exe/cscript.exe spawning PowerShell and subsequent staged text retrieval/reassembly as high-signal behavior for investigation.
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Researchers said the activity appears to target enterprises and SMBs in a broad 'spray-and-pray' manner consistent with financially motivated operators or possible initial access broker activity. They also stated there was insufficient evidence to attribute the campaign to a known threat actor.
Technical analysis showed the malware reconstructs payload components from benign-looking text files, decodes .NET assemblies in memory, and uses legitimate Windows tools such as wscript.exe, PowerShell, and MSBuild.exe to reduce on-disk artifacts and evade detection. Securonix also linked the final payload to Remcos RAT through infrastructure tracing and payload signature matching.
Securonix researchers reported a newly identified multi-stage Windows malware campaign dubbed SHADOW#REACTOR. The campaign uses an obfuscated VBS launcher, PowerShell, and text-based payload fragments retrieved from remote infrastructure to ultimately deploy Remcos RAT.
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Researchers reported multiple **Remcos RAT** campaigns using phishing emails and trusted infrastructure to infect victims while evading detection. In one intrusion chain, a ZIP attachment named `MV MERKET COOPER SPECIFICATION.zip` delivered an obfuscated JavaScript file that fetched a PowerShell loader from `almacensantangel[.]com`; the loader then reconstructed and decrypted payloads in memory, including `ALTERNATE.dll` and `Cqeqpvzeia.exe`. The malware injected into the legitimate Microsoft .NET utility `aspnet_compiler.exe`, communicated with `192[.]3[.]27[.]141:8087`, and stored captured keystrokes and other data in `C:\ProgramData\remcos\logs.dat`, leaving few disk artifacts. A separate campaign used phishing emails that linked to a fake Google Drive sharing page hosted through **Google Cloud Storage** and the trusted `googleapis.com` domain, helping the attack bypass email and web filtering. After user interaction, the infection chain used staged JavaScript redirects or downloads, followed by VBScript or PowerShell execution to retrieve the final Remcos payload, which was then injected into a legitimate Windows process through **process hollowing**, persisted via Windows Registry entries, and opened encrypted command-and-control channels. The activity underscores how attackers are combining living-off-the-land techniques, trusted cloud services, obfuscated scripting, and legitimate Windows binaries to deploy Remcos for surveillance and data theft.
Jun 29, 2026
Multiple campaigns are using phishing emails and archive-based lures to deliver remote access malware through stealthy, multi-stage infection chains. Point Wild documented **Remcos RAT**, **DesckVB RAT**, and a Rust-based **COVERT RAT** being delivered through ZIP attachments, weaponized `LNK` files, obfuscated JavaScript droppers, and hidden PowerShell execution, often with decoy documents to mask activity. The payloads were loaded filelessly through .NET reflection and in-memory execution, with operators abusing legitimate binaries and services such as `aspnet_compiler.exe`, GitHub, and paste or web-hosting platforms to stage malware while evading detection. Reported command-and-control infrastructure included `192.3.27.141:8087`, `172.245.246.77:8080`, and `181.231.253.69:4444`, while observed artifacts included `C:\ProgramData\remcos\logs.dat`, `C:\ProgramData\colors\logs.dat`, and payload names such as `ALTERNATE.dll`, `ClassLibrary3.dll`, `Keylogger.dll`, and `msedge_proxy.exe`. Separate reporting showed the same tradecraft extending beyond custom RATs to commodity remote-access software and credential theft. A campaign targeting Russian aerospace and aviation organizations used invoice-themed phishing and spoofed domains to install a portable **AnyDesk** instance for unattended access, maintain persistence with a scheduled task, minimize visibility with Tray Minimizer, and exfiltrate configuration data through a command-line SMTP mailer; Seqrite linked the activity to **Rare Werewolf (Librarian Ghouls)**. Securonix research cited by Trojan Killer described **VEIL#DROP** using fake document-style JavaScript files, Blogspot-hosted staging, PowerShell download cradles, XOR decoding, and in-memory .NET loading to deploy **PureLog Stealer**, which targets browser credentials, cookies, session tokens, wallet data, and host information. Across the campaigns, the common pattern is phishing-led initial access followed by LOLBins, PowerShell, staged downloads, persistence, and covert data theft or long-term remote control.
Jul 12, 2026
Researchers and incident reports show **Remcos RAT** continuing to spread through multiple delivery channels, including business-themed phishing emails, fake cryptocurrency software, and multi-stage script loaders. Trend Micro documented a phishing campaign using an ACE archive attachment and an AutoIt-based loader to install **Remcos Professional 1.7**, while ESET reported a spoofed SafeMoon application that delivered Remcos to cryptocurrency users. SonicWall later identified a newer infection chain using VBScript, batch files, PowerShell, and a .NET loader to deploy Remcos after patching **AMSI** and **ETW** for defense evasion, with observed targeting of European institutions. Technical analysis from Elastic Security Labs found that modern Remcos samples retain extensive remote-access and surveillance functions, including **keylogging, screenshots, audio capture, webcam access, shell command execution, password theft, browser-history collection, persistence, process injection, and UAC bypass**. Elastic recovered most of the malware’s configuration structure and command set, showing that Remcos stores encrypted settings, supports TLS-enabled command-and-control, can masquerade as legitimate processes such as `explorer.exe`, and can clean browser artifacts or uninstall itself on command. The reporting underscores how a tool originally marketed for red teaming has become a widely abused malware family with increasingly evasive delivery chains and mature post-compromise control features.
Aug 14, 2026