Classloader exploit
The Classloader files are part of Internet Explorer homepage hijacker trojans, that infect IE through malicous web page that uses Java classloader byteverify exploit or other vulnerability in Internet Explorer.
The easiest way to be safe from these trojans is to make sure that Internet Explorer is up to date. Although even with updated IE the trojans are sometimes downloaded but cannot activate.
The easiest way to get rid of these trojans is to:
Update your Internet Explorer using Windows update to prevent any further infections.
1. Open http://windowsupdate.microsoft.com
2. Select all available updates
3. Windows update installs updates and reboots
4. Return to the Windows updates to make sure you have all updated
Clear the Internet Explorer temporary file cache
1. Open Internet Explorer
2. Select "Tools"->"Internet Options..." from the top menu
3. Select "General" tab (this should be visible already)
4. Click from "Temporary Internet files" pane button "Delete Files..."
5. Select checkbox "Delete all offline content"
6. Click "OK"
Scan your computer with F-Secure Anti-Virus to remove any other downloaded components.
More details can be found from http://www.f-secure.com/v-descs/classloader.shtml.
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