mailbook.exe is an executable file which primary purpose is to start a parasite or launch some of its components. Once executed, the mailbook.exe file runs a process that is responsible for the parasite's payload. mailbook.exe is a significant part of a dangerous threat, but it can also work on its own. DO NOT execute it!
The mailbook.exe file is installed and used by adware
AdvSearch and
ActualNames.
You are highly advised to scan the system, delete executable mailbook.exe and terminate all the processes it started.
Sometimes a presence of mailbook.exe does not indicate that your computer is infected. It can be an essential system file or a file installed by harmless legitimate software and therefore may not pose any threat to your privacy and the system. Although such cases are quite rare, you should thoroughly examine mailbook.exe before completely deleting or leaving it in the system.
