Elf_Rexob.A is a malicious Executable Linux File (ELF) that may be dropped by other malware.

It acts as a server tool that can compromise system security by allowing remote users to manipulate and access affected systems.

It can also create its own server component. Using a predefined port, it allows a remote user to obtain files from an affected system. It also allows a remote malicious user to execute certain commands on the affected system.

Technical details can be found at this Trend Micro page.