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- Discovered:
- September 4, 2003
- Updated:
- February 13, 2007 12:23:36 PM
- Also Known As:
- TrojanDownloader.Win32.Small.b, Downloader-EA [McAfee]
- Type:
- Trojan Horse
- Systems Affected:
- Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP
Trojan.Norio is a Trojan horse that modifies browser and network settings to direct you to pornographic Web sites. This Trojan horse changes the default Explorer home page and search pages by modifying the registry.
The worm includes a component that can download and execute arbitrary code on your computer.
Note: At the time of this writing, this Trojan uses the file names, Winupdate.exe and Lookupsys.exe, in the Windows folder.
Antivirus Protection Dates
- Initial Rapid Release version September 4, 2003
- Latest Rapid Release version September 28, 2010 revision 054
- Initial Daily Certified version September 4, 2003
- Latest Daily Certified version September 28, 2010 revision 036
- Initial Weekly Certified release date September 4, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
- Wild Level: Low
- Number of Infections: 50 - 999
- Number of Sites: 3 - 9
- Geographical Distribution: Low
- Threat Containment: Easy
- Removal: Difficult
Damage
- Damage Level: Medium
Distribution
- Distribution Level: Low
Writeup By: Heather Shannon
