Elastic Security Labs discovered a new Contagious Interview campaign (REF9403) attributed to DPRK-aligned threat actors that uses fake coding challenges to deliver malware hidden via SVG steganography. The trojanized repositories contain a four-stage JavaScript payload aligned with OTTERCOOKIE, combining browser credential/crypto wallet theft, file exfiltration, a Socket.IO RAT, and clipboard stealing. The malware uses obfuscator.io for code protection, custom Base64 decoding to evade detection, and masquerades as npm-cache processes while exfiltrating data to rightwidth.dev C2 infrastructure.
SVG Steganography
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New North Korean campaign uses fake coding interviews to steal developer credentials