Multiple Malware Campaigns Abuse Phishing and Legitimate Cloud Services to Compromise Windows and Linux Systems
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.
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