Threats Tagged 'obfuscation techniques'

A TrickBot variant has been identified that uses DNS tunneling for command-and-control communications instead of traditional HTTP protocols. The malware maintains persistence through Windows Task Scheduler, creating disguised tasks that execute at startup and repeat every five minutes. Configuration data is stored in NTFS Alternate Data Streams to evade detection. The malware employs multiple obfuscation techniques including encrypted strings, runtime API resolution via hash-based lookups, and dynamically calculated constants. Its modular architecture supports twelve different control commands enabling capabilities such as module downloads, process injection through hollowing and doppelgänging techniques, PowerShell execution, and raw machine code execution. The variant transfers data through specially crafted DNS queries to public DNS servers, encoding command data in malformed domain names and receiving responses embedded within multiple IPv4 addresses, achieving transfer speeds of approximately 30.7 KB/s.

An active Lampion malware campaign has been identified targeting Portuguese users through phishing emails that impersonate financial and administrative communications. Lampion, a Brazilian banking malware derived from the ChePro lineage, delivers initial payloads via ZIP archives containing heavily obfuscated HTML files designed to evade detection. The HTML stage retrieves additional scripts from attacker-controlled infrastructure, initiating a multistage VBS infection chain. Each stage employs extensive obfuscation techniques including junk code, encrypted strings, and dynamically generated scripts that inflate file sizes while concealing core functionality. The infection chain is deliberately fragmented across multiple independent execution stages, complicating behavioral analysis. Telemetry shows 94.6% of detections concentrated in Portugal, confirming this is a highly targeted threat focused on Portuguese-speaking victims.

MediumMalwarePortugal#phishing campaign#banking trojan#vbs infection chain

This analysis examines new obfuscation techniques employed by Gremlin stealer malware to conceal malicious payloads within embedded resources. A variant protected by sophisticated commercial packing utility uses instruction virtualization, transforming code into custom bytecode executed by a private virtual machine. The malware siphons sensitive information including payment card details, browser cookies, session tokens, cryptocurrency wallet data, and FTP/VPN credentials from compromised systems. It exfiltrates data to attacker-controlled servers at hxxp[:]194.87.92[.]109 for potential publication or sale. Recent iterations incorporate expanded Discord token extraction, active financial fraud through crypto clipper functionality that replaces cryptocurrency wallet addresses in real-time, and WebSocket-based session hijacking to bypass modern cookie protections. The malware employs advanced anti-analysis techniques including XOR-encoded payloads in .NET resource sections, identifier renaming, string encryp...