There are numerous variants of backdoor Trojans but no generic "one all" solution. What works on removing one many not always work on another. As such, different tools and techniques are utilized to remove them once identified. Backdoor/IRCBot Trojans
are very dangerous
because they provide a means of accessing a computer system that bypasses security mechanisms. Remote attackers use backdoor Trojans as part of an exploit to to gain unauthorized access to a computer and take control of it without your knowledge.
Once infected, if your computer was used for online banking or has credit card information on it, all passwords should be changed immediately
to include those used for email, eBay and forums. You should consider them to be compromised
. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified of the possible security breech.
Although a backdoor Trojan can be identified and removed, the PC has likely been compromised and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume that because the backdoor Trojan has been removed the computer is now secure. Many experts in the security community believe that once infected with this type of Trojan, the best course of action is to reformat and reinstall the OS - "When should I re-format?
For XP users, the easiest thing is to do a System Restore
and choose a restore point with a creation date before the date of infection.