Ezula (sometimes spelled "eZula") is a form of adware installed as part of a browser helper object (BHO). Without the user's permission, ezula communicates with a remote server and displays context-based advertisements to the individual.
Ezula contains no dangerous viruses but can slow a user's browser and has to be manually installed by the user. As it comes as part of a BHO, it may appear as an optional third-party add-on during the install process. The program adds advertising links to keywords on a Web page, and when clicked on, it directs the user to a third-party website — usually unrelated to what they were originally searching for. The program automatically begins on a Windows start-up and can remotely update itself via the Internet without user consent. It has been reported to come as part of a program named TopText or Surf+.