Threats Tagged 'snake keylogger'

Cruciferra is a sophisticated crypter service utilized by multiple unrelated cybercriminal threat clusters to deliver remote access trojans and infostealers. Written in Mono, it employs extensive defense-evasion capabilities including indirect system calls, API unhooking, BYOVD-based EDR tampering, privilege escalation, and customized Process Ghosting for payload execution. The service features over 90 variations of cryptographic functions to obfuscate data and payloads, complicating static analysis and signature-based detection. Cruciferra was first advertised in fall 2025 with pricing tiers ranging from $450 to $2000 monthly. It has been observed in campaigns delivering various malware families including zgRAT, AgentTesla, AsyncRAT, XLoader, XWorm, Phantom Stealer, Formbook, and Remcos, primarily targeting financial services, healthcare, and government entities through opportunistic email-based attacks.

Since late March 2026, a large-scale phishing campaign has been deploying malware including Agent Tesla, Remcos, XWorm, and Best Private LOGGER through fileless techniques and low-detection Lua-based loaders. Attackers impersonate well-known companies using business cooperation lures to distribute malicious archives containing obfuscated JavaScript files. These scripts deploy either AutoIt or LuaJIT interpreters alongside disguised scripts masquerading as TrueType Font (.ttf) files. The Lua loaders employ sophisticated anti-analysis techniques including custom ROT ciphers, decoy memory allocation, and Donut shellcode generation for reflective in-memory payload execution. The campaign evolved from simpler implementations in October 2025 to highly complex versions by June 2026, incorporating API unhooking and advanced debugging countermeasures. Victims are ultimately infected with Remote Access Trojans and infostealers that enable full system control and extensive data exfiltration.

Proofpoint researchers have observed an increase in cybercriminals using Stealerium-based malware, an open-source infostealer available on GitHub. Multiple stealers share code with Stealerium, including Phantom Stealer. Campaigns delivering Stealerium have used various lures and file types, targeting industries like hospitality, education, and finance. The malware can exfiltrate a wide range of data, including browser credentials, credit card info, and crypto wallet data. It uses anti-analysis techniques and can exfiltrate data through multiple channels like SMTP, Discord, and Telegram. The rise in Stealerium usage reflects the growing trend of threat actors pivoting to information stealers as identity theft becomes a priority.

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The S2 Group’s intelligence team has identified through adversary tracking a new phishing campaign by Snake Keylogger, a Russian origin stealer programmed in .NET, targeting various types of victims, such as companies, governments or individuals. The campaign has been identified as using spearphishing emails offering oil products.

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