Threats Tagged 'process hollowing'

A sophisticated phishing campaign was identified distributing multiple malware families through a multi-stage loader utilizing steganography and fileless techniques. The infection chain begins with archive attachments containing files disguised as financial documents, primarily targeting Indian organizations using names related to GST, NEFT, RTGS, and IMPS transactions. The loader employs in-memory execution to avoid disk-based artifacts and uses embedded .NET Bitmap objects to conceal payloads. Various malware families have been deployed including Remcos RAT, Agent Tesla, MassLogger, Phantom Stealer, Dark Cloud, Red Line Stealer, Snake keyloggers, Formbook, and xworm. The final payloads establish persistence through registry Run keys, perform process hollowing, steal browser credentials, record audio and webcam, and exfiltrate data to command-and-control infrastructure. The campaign exhibits characteristics of a loader-as-a-service operation serving multiple threat actors globally.

MediumMalwareBritish Indian Ocean TerritoryIndia#fileless#loader-as-a-service#steganography

A sophisticated malware campaign exploits growing interest in artificial intelligence by distributing malicious files disguised as AI-related learning resources and technical guides. The attack employs an exceptionally complex multi-stage infection chain beginning with compressed archives containing LNK shortcuts and hidden PDF files. Through multiple layers of obfuscation involving PowerShell scripts, batch files, and AutoHotkey loaders, the campaign establishes persistent access and deploys two distinct .NET Remote Access Trojans including AsyncRAT. The intermediate scripts extensively use Simplified Chinese variable names and exhibit coding patterns suggesting AI-assisted development, with cultural references to Chinese mythology used as symbolic aliases for Windows API calls. The attack implements advanced techniques including process hollowing, reflective DLL injection, and scheduled task persistence while actively disabling Windows Defender exclusions to facilitate execution.

A sophisticated phishing campaign distributes a PureLogs variant through deceptive purchase order emails containing malicious JavaScript files. The attack chain employs obfuscated JavaScript that drops PowerShell scripts, which then use process hollowing techniques to inject .NET modules into legitimate Windows processes. The malware communicates with command-and-control infrastructure to download additional plugins. PureLogs collects extensive sensitive information including credentials from web browsers, cryptocurrency wallets, email clients, Discord, and various applications. It also captures screenshots, system information, and clipboard data. The collected data is compressed, encrypted with AES, and exfiltrated to remote servers. The campaign demonstrates advanced evasion techniques through fileless execution, multiple encryption layers, and abuse of trusted processes like MsBuild.exe, making detection challenging for traditional security solutions.

Microsoft Defender Experts identified an active cryptojacking campaign leveraging AI-assisted delivery mechanisms alongside traditional SEO poisoning. Attackers create fake download sites impersonating trusted utilities like CrystalDiskInfo, HWMonitor, and FurMark, targeting users with high-performance GPUs. Victims download ZIP archives containing legitimate executables bundled with malicious DLLs that establish persistence via ScreenConnect remote access tools. The operation employs sophisticated techniques including DLL sideloading, process hollowing into Microsoft-signed .NET binaries, and comprehensive defense evasion. Beyond cryptocurrency mining, the campaign establishes persistent remote access that could enable data theft, lateral movement, or ransomware deployment. The threat actors deliberately target PC enthusiasts and hardware-focused users most likely to own discrete GPUs suitable for profitable mining operations.