This kind of initial access is also a hot commodity on underground cyberforums, where ransomware groups and others can purchase it. Once installed, it can execute follow-on code as well as additional commands, through which malicious actors can carry out follow-on attacks or pivot to move further into a corporate network. These were uploaded to VirusTotal with the suffix “.ts,” which is used for TypeScript files.ĭubbed SysJoker by Intezer, the backdoor is used for establishing initial access on a target machine. The Windows version, according to a Tuesday writeup from Intezer, has only six detections as of this writing. A brand-new multiplatform malware, likely distributed via malicious npm packages, is spreading under the radar with Linux and Mac versions going fully undetected in VirusTotal, researchers warned.
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