Backdoor:W32/Zxshell.A is a DLL file with an exported function ("Install"), which is called to install the backdoor.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
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After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Backdoor:W32/Zxshell.A is similar to other backdoor programs in providing a wide range of functionalities. Some of the functionalities it provides are:
Upon execution, it will drop a rootkit driver (detected as Rootkit:W32/Zxshell.B)
In order to load the backdoor automatically during the system startup, it needs to install to the system launch point as a system service in the registries:
It will connect to the remote host of the attacker machines. The URL of the remote host is set by the attacker to where the backdoor wants to connect to.
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