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Researchers reported a large-scale phishing campaign targeting Windows users with malicious archives that masquerade as business cooperation or payment-related documents from well-known companies. The infection chain uses heavily obfuscated JScript droppers and an AutoIt- or Lua-based loader disguised as a TrueType font (.ttf) file, enabling a largely fileless compromise path designed to avoid detection. Security reporting described the operation as global in scope, with lures crafted to persuade recipients to open fake font files that trigger the malware delivery process.
The campaign has deployed multiple commodity malware families, including Agent Tesla, Remcos, XWorm, and Best Private LOGGER, the latter assessed as a variant of Snake Keylogger based on shared modules and coding patterns. Researchers said the loader evolved significantly from late 2025 through mid-2026, adding anti-analysis features such as junk code, string obfuscation, API unhooking, breakpoint neutralization, Donut shellcode signature patching, decoy memory, and segmented shellcode decryption through a Vectored Exception Handler. Published indicators include domains, IP addresses, a Discord-hosted malicious JavaScript file, and SHA-256 hashes to support enterprise detection and threat hunting.
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Researchers published technical details and detection artifacts for the campaign, including infrastructure and file-based indicators such as domains, IP addresses, a Discord-hosted malicious JavaScript file, and SHA-256 hashes. The reporting also detailed the fileless multi-stage infection chain and evasion methods used by the loader.
The Fortinet report documents the Lua loader's evolution across samples from October 2025 through June 2026, showing increasing sophistication in anti-analysis, shellcode execution, and process injection techniques. It also links Best Private LOGGER to Snake Keylogger based on shared modules, coding style, and naming conventions.
Researchers observed a large-scale phishing campaign targeting Microsoft Windows organizations since late March 2026. The campaign used obfuscated JScript droppers and AutoIt or Lua-based loaders disguised as .ttf files to deliver malware including Agent Tesla, Remcos, XWorm, and Best Private LOGGER.
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A global phishing campaign dubbed **TTF Trap** is using business email compromise lures and impersonation of trusted brands such as **FedEx** to infect **Windows** users with remote access Trojans and infostealers. Fortinet said the operation begins with phishing emails carrying or linking to ZIP or RAR archives, then launches heavily obfuscated JavaScript that establishes persistence and triggers a disguised loader hidden inside a fake `.ttf` font file. The loader runs through legitimate **LuaJIT** or **AutoIt** interpreters and uses layered obfuscation, in-memory execution, API unhooking, anti-analysis checks, and reflective loading to avoid detection while keeping payloads off disk. Researchers observed the campaign since late March and said related loader code dates back to October 2025; malware delivered in the operation includes **Agent Tesla**, **Remcos**, **XWorm**, **Best Private Logger**, and **Snake Keylogger** variants, with the apparent goal of stealing data and maintaining remote access for follow-on attacks.
Jul 22, 2026
Reporting describes several unrelated but contemporaneous malware operations targeting both Windows and Linux environments. In Taiwan, FortiGuard Labs observed targeted phishing using tax and e-invoice lures to deliver **Winos 4.0 (ValleyRat)** and plugins, with delivery chains including malicious `.LNK` files, **DLL sideloading**, and **BYOVD** using the vulnerable driver `wsftprm.sys`, supported by rapidly rotating domains and cloud-hosted infrastructure that reduces the effectiveness of static blocklists. Separately, Cato CTRL reported a new Windows loader, **Foxveil**, that stages and retrieves shellcode via trusted platforms (**Cloudflare Pages**, **Netlify**, and **Discord attachments**) and executes payloads using techniques including **Early Bird APC injection** (often into a fake `svchost.exe`) or self-injection, while persisting via Windows services or masqueraded binaries dropped into `SysWOW64`. Additional reporting covers distinct campaigns in other regions and platforms. A LATAM-focused intrusion chain uses fake bank receipt lures (double-extension such as `.pdf.js`) to deliver **XWorm v5.6**, employing oversized/obfuscated JavaScript, WMI-based process creation (`Win32_Process`) to launch hidden PowerShell, and abuse of a hardcoded **Cloudinary** URL for staging—capabilities consistent with credential theft and enabling follow-on ransomware. Trellix analysis described a separate **Monero** cryptomining operation distributed via pirated software installers that propagates through **USB/external drives** to reach even air-gapped systems, using multi-component “watchdog” self-healing behavior and aggressive defense-evasion. On Linux, LevelBlue detailed a new **SysUpdate** variant (packed `ELF64`) that performs host reconnaissance and uses strong C2 encryption; researchers built a **Unicorn Engine**-based emulation tool to reproduce key generation/encryption routines and decrypt captured C2 traffic for investigation and detection engineering.
Jun 29, 2026
Proofpoint reported that suspected China-linked cybercrime group **TA4922** has expanded beyond its traditional East Asia focus and is now targeting organizations in the **UK, Germany, Italy, South Africa**, and other regions with localized phishing campaigns. The actor has used lures tied to **tax filings, payroll, benefits, invoices, HR notices, and compliance requests** to trick recipients into opening attachments, clicking links, or continuing email conversations, with activity increasing from spring 2025 and intensifying in March and April 2026. The campaigns delivered credential phishing and malware including **`SilentRunLoader`**, **`Atlas RAT`**, **`RomulusLoader`**, and **`Winos4.0`/`ValleyRAT`**. Proofpoint said the group relies on **DLL sideloading**, anti-analysis techniques, process injection, and selective payload delivery, while also abusing legitimate remote-management and file-sharing tools such as **AnyDesk**, **SyncFuture**, **GoFile**, **LimeWire**, and **MediaFire** to blend into normal activity and maintain access. Researchers assessed the actor as primarily **financially motivated**, pursuing credential theft, fraud, data theft, persistence, and access resale, and said code artifacts in the Python-based **`SilentRunLoader`** suggest some malware development may have been assisted by **large language models**.
Aug 11, 2026