. According to data provided by the security company Eset, the Win32/Conficker worm ranked first in the ranking of malicious file propagation in February 2009, with a percentage of 7.48 percent of total detections.This worm spreads in work networks taking advantage of a recent vulnerability in Microsoft's Windows operating systems, which is located in the RPC subsystem and can be exploited remotely by the attacker, allowing him to perform malicious actions without using valid user credentials. In addition, there is an upward trend of the spread of Win32/Conficker variants propagating through shared resources and removable storage devices.
On the other hand, the Win32/PSW. OnlineGames ranked second with 7.33 percent, while INF/Autorun dropped to third place with 6.44 percent of the total.
The Win32/Agent continues in fourth place with 3.67. This threat is a generic detection that describes a number of members of a broad family of malware capable of stealing user information from infected computers.
Win32/TrojanDownloader.Swizzor.NBF appears in the fifth position with 2.07 percent of the total and is a malware frequently used to download and install other malicious components on an infected computer, usually adware.
