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Malware

LOTUSHARVEST

LOTUSHARVEST is an information-stealing malware family observed in Operation Hanoi Thief, a spear-phishing campaign targeting Vietnamese IT departments and HR/recruitment professionals. The malware is delivered through phishing emails carrying ZIP attachments that contain a malicious LNK shortcut and a pseudo-polyglot file disguised as a resume. The LNK abuses the LOLBIN ftp.exe to execute the pseudo-polyglot payload, which displays a decoy document, extracts a base64-encoded DLL, and ultimately deploys LOTUSHARVEST as a C++ DLL implant via DLL sideloading using ctfmon.exe. The DLL has been reported as being placed in C:\ProgramData and loaded through sideloading.

LOTUSHARVEST steals browser data from Chrome and Edge, including stored credentials and browsing history; reporting states it can collect up to 5 stored credentials and up to 20 recent URLs. It uses anti-analysis checks for virtual environments and debuggers, and exfiltrates stolen data via HTTPS POST requests using the WinINet API. Reported attacker-controlled infrastructure used for exfiltration includes eol4hkm8mfoeevs.m.pipedream.net and uuhlswlx.requestrepo.com, with the campaign also using randomly generated subdomains.

The campaign was first observed on November 3, 2025. Attribution in the reporting suggests a Chinese-origin threat actor based on TTP overlaps with earlier Vietnam-focused activity, but state sponsorship was not confirmed. SEQRITE detections cited for this malware/campaign include Trojan.50086.SL and Trojan.A18678918. Observed ATT&CK behaviors include spearphishing attachment delivery, DLL side-loading, credential theft from password stores, masquerading, signed binary proxy execution, and deobfuscation.

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