North Korean Contagious Interview Campaign Uses JSON Services for Malware Delivery
North Korean threat actors associated with the Contagious Interview campaign have adopted new tactics by leveraging JSON storage services such as JSON Keeper, JSONsilo, and npoint.io to host and deliver malware. These actors approach software developers, particularly those in cryptocurrency and Web3 sectors, via professional networking platforms like LinkedIn, posing as recruiters or collaborators. Victims are lured into downloading trojanized code projects from platforms like GitHub or GitLab, which contain hidden links to malicious payloads stored in JSON services. The initial payload, often disguised as an API key, leads to the download of JavaScript malware such as BeaverTail, which can harvest sensitive data and deploy additional backdoors like InvisibleFerret.
The campaign's modular approach allows for further payloads, including TsunamiKit, to be fetched from external sources like Pastebin or .onion addresses. The malware toolkit is capable of system fingerprinting, data collection, and persistent access, with some payloads specifically targeting multiple operating systems including Windows, Linux, and macOS. The Contagious Interview campaign remains focused on financial gain for the DPRK regime and demonstrates ongoing evolution in its social engineering and malware delivery techniques, as highlighted by recent research from NVISO and corroborated by other security firms.
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