, and IRCBots
are very dangerous
because they compromise system integrity
be making changes that allow it to be used by the attacker for malicious purposes. They can disable your anti-virus and security tools to prevent detection and removal
. Remote attackers use backdoors as a means of accessing and taking control of a computer that bypasses security mechanisms. This type of exploit allows them to steal sensitive information like passwords, personal and financial data which is send back to the hacker. Read Danger: Remote Access Trojans
If your computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately
to include those used for banking, email, eBay, paypal and any online activities which require a username and password. You should consider them to be compromised
and change all passwords from a clean computer, not the infected one. If not, an attacker may get the new passwords and transaction information. Banking and credit card institutions should be notified immediately of the possible security breach. Failure to notify your financial institution and local law enforcement can result in refusal to reimburse funds
lost due to fraud or similar criminal activity. If using a router
, you need to reset it with a strong logon/password so the malware cannot gain control before connect again.
Although the infection was identified and may be removed, your machine 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 the computer is secure even if the malware appears to have been removed
. In some instances an infection may have caused so much damage to your system that it cannot be successfully cleaned or repaired. The malware may leave so many remnants behind that security tools cannot find them. Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, reformat
and reinstall the OS. Please read:
Backdoors and What They Mean to You
Whenever a system has been compromised by a backdoor payload, it is impossible to know if or how much the backdoor has been used to affect your system...There are only a few ways to return a compromised system to a confident security configuration. These include:
• Reimaging the system
• Restoring the entire system using a full system backup from before the backdoor infection
• Reformatting and reinstalling the system
This is what Jesper M. Johansson at Microsoft TechNet has to say: Help: I Got Hacked. Now What Do I Do?
The only way to clean a compromised system is to flatten and rebuild. That’s right. If you have a system that has been completely compromised, the only thing you can do is to flatten the system (reformat the system disk) and rebuild it from scratch (reinstall Windows and your applications).