Malware dubbed ACBackdoor is developed by a threat group with experience in developing malicious tools for the Linux platform based on the higher complexity of the Linux variant. The Windows version is being pushed through malvertising with the help of the Fallout Exploit Kit while the Linux payload is dropped via a yet unknown delivery system. Both malware variants use Hypertext Transfer Protocol Secure (HTTPS) as a communication channel, with all the collected information being sent as a BASE64 encoded payload. The Linux version is also more complex and has extra malicious capabilities, although it shares a similar control flow with the Windows version.
Source: https://www.bleepingcomputer.com/news/security/linux-windows-users-targeted-with-new-acbackdoor-malware/