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S1249malware

HexEval Loader

HexEval Loader is a hex-encoded loader that collects host data, decodes follow-on scripts and acts as a downloader for the BeaverTail malware. HexEval Loader was first reported in April 2025. HexEval Loader has previously been leveraged by North Korea-affiliated threat actors identified as Contagious Interview. HexEval Loader has been delivered to victims through code repository sites utilizing typosquatting naming conventions of various npm packages.

Platforms: Linux, macOS, Windows

MITRE ATT&CK ↗

Linked entities · 13

usesT1082System Information Discovery usesT1056.001Keylogging usesT1105Ingress Tool Transfer usesT1059.007JavaScript usesT1027.013Encrypted/Encoded File usesT1016System Network Configuration Disc…usesT1041Exfiltration Over C2 Channel usesT1036.005Match Legitimate Resource Name or…usesT1033System Owner/User Discovery usesT1614System Location Discovery usesT1071.001Web Protocols usesT1140Deobfuscate/Decode Files or Infor…uses byG1052Contagious Interview