Trojans are malicious applications that pose themselves as legitimate software in order to trick users to install them. Once on the victim's machine, it may run any number of malicious process to steal vital information or inflict damage to other software.
This is a Trojan that installs a file called Googlebot.exe in the system32 directory of the compromised machine. Once running, it contacts several search engines looking for specific search strings usually related to pornography. It also adds itself as an allowed application through the firewall.