Malware has been targeting supercomputers across the world, often stealing the credentials for secure network connections by using a trojanized version of the OpenSSH software. The malware is not widespread and appears to target mostly high-performance computers (HPC) and servers on academic and research networks. Kobalos has a small but complex codebase that can execute on other UNIX platforms (FreeBSD, Solaris). There may also be variants for AIX and Windows operating systems.
Source: https://www.bleepingcomputer.com/news/security/new-linux-malware-steals-ssh-credentials-from-supercomputers/