Oops...didn't trim enough of the response and curiosity made me research this.
According to the sophos site: --cut-- Linux/Rst-B will attempt to infect all ELF executables in the current working directory and the directory /bin If Linux/Rst-B is executed by a privileged user then it may attempt to create a backdoor on the system. This is achieved by opening a socket and listening for a particular packet containing details about the origin of the attacker and the command the attacker would like to execute on the system. --end-- I'd reinstall since you ran this executable on your system as root. Who knows what the full extent of the damaged caused is...
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