SpyEye evolved from buggy crimeware to the weapon of choice for many, when ZeuS retreated and left the market to the SpyEye group. A year later SpyEye mysteriously disappeared. They had something on the side though. We have strong evidence that Tilon, the malware-for-rent (thought to be based on Silon) was actually developed by the SpyEye authors and based largely on the SpyEye source code.