Question

what is a backdoor virus

Answer 1

Backdoor.Trojan is a detection name used by Symantec to identify malicious software programs that share the primary functionality of enabling a remote attacker to have access to or send commands to a compromised computer.

Answer 2

Backdoor virus is a Trojan which is a detection name used by Symantec to identify malicious software programs that share the primary functionality of enabling a remote attacker to have access to or send commands to a compromised computer.