This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects a 'Downloader' file which may pull down more files which may compromise the target system.
Downloader is a detection name used by Symantec to identify malicious software programs that share the primary functionality of downloading content.
The content that is downloaded varies from one example to the next. It may comprise of, but need not be limited to, the following items:
Other threats or security risks, such as components related to pay per install operations
Secondary components of, or upgrades to, the existing attack
Most downloaders that are encountered will attempt to download content from the Internet rather than the local network. In order to successfully achieve its primary function a downloader must run on a computer that is inadequately protected and connected to a network. An adequately protected computer will either prevent the downloader from running in the first place or prevent unauthorized access to network resources and thereby prevent the attack from being carried out to its conclusion.