Needy.H is a Java applet based trojan that downloads and executes a trojan downloader. Needy activates when user views a web page or HTML email that contains a reference to the trojan file.
Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.
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The Needy.H is activated when a web site containing the trojan is loaded with unpacthed Microsoft Internet Explorer browser. When the JAR file containing the trojan is executed it uses Microsoft Internet Explorer VerifierBug vulnerability to get full privileges by escaping the Java security, and execute its code.
When executed the trojan downloads an executable from web server saves it to users home directory and executes it.