A Trojan is a program that enables an attacker to get nearly complete control over an infected PC. Frequently used tool by malicious hackers. When this program executes, the program performs a specific set of actions. This usually works toward the goal of allowing the trojan to survive on a system and open up a backdoor.
Comment:
This is a trojan that installs the alexa toolbar without user consent in order to inflate the alexa ranking of the distributor's website.