writes ""do-it-yourself" botnet kits provide malware creators the tools required to build and administer a their own botnet. These botnet kits are by no means new to the market, but have gained serious momentum recently. The botnet kits even include an easy to use control panel application to maintain/update the botnet, and to retrieve the captured information. A configurable builder tool allows the author to create the executables that will be used to infect victim's computers.
These ZeuS/ZBot trojans are typically spread via spam and black hat SEO poisoning, appearing to come from legitimate sources, asking recipients to click on a link which installs the malware and then sits silently, waiting for users to enter in their credentials to particular sites such as an online banking site"Link to Original Source