What are the ramifications of having been infected with malware with a backdoor component?
Your antivirus solution has detected malicious code infecting your computer. Upon reading the writeup for the threat, you see that it contains backdoor capabilities.
Backdoors are a particular method for malicious code to affect your computer. Malware with backdoors can permit unauthorized users to perform actions on your system that you may not wish. In short, if your computer has hosted malware with a backdoor component, the computer's security integrity has been compromised as there is no means for confirming if the backdoor has been actively used but the potential is present.
Removing the malware from your system is an excellent first step and is only a short-term means for addressing the situation. 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.
Some effects possible using a backdoor include:
new users/groups added
additional programs loaded
new shares established
core operating system functions could be altered
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
Installing a new version of the operating system over the compromised operating is not a good solution as files may have been altered that could affect the new system. Even copying business critical information from a compromised system is a risk as that data may have been altered in some manner by use of the backdoor.
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