The Win32/Zbot is a family of password-stealing Trojans that typically targets online banking credentials. Last October, Microsoft added detection for 500 variants of the malware to its Malicious Software Removal Tool (MSRT) The Trojan was most prevalent in Spain, where one out of every 100 computers running Microsoft Security Essentials had at least one Win32-Zbot attack attempt. In both August and October 2010, the malware detected in Hotmail detections jumped, Microsoft says.”]
Source: https://www.darkreading.com/attacks-breaches/new-microsoft-data-shows-zbot-decline