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.
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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