Virus experts say there s reason to question whether the union is still intact. Zeus and SpyEye were the two main families of botnet software, with SpyEye playing the role of upstart competitor to the more established Zeus. Microsoft and Kaspersky Lab say reports of the merger may have been overblown. The two malware families continue as separate entities, with some researchers wondering if they are even controlled by the same individuals or criminal groups. In September 2010, more than 60 individuals were charged in the U.S. and U.K. for crimes linked to the Zeus malware.
Source: https://threatpost.com/spyeye-and-zeus-malware-married-or-living-separately-101411/75755/