W32.Changeup!gen40 is a heuristic detection that may include members of the W32.Changeup family of threats.

Initial Daily Certified version of virus definitions for Norton security products was released on April 23, 2013 revision 009. It should be noted that users with the older versions of Norton Internet Security are limited to Daily LiveUpdate definitions. For more information, go to the page where the are described virus definitions available for Norton products.

W32.Changeup!gen40 Threat Assessment

Component	Severity
Wild Level	Low
Number of Infections	50 - 999
Number of Sites	3 - 9
Geographical Distribution	Low
Threat Containment	Easy
Removal	Easy
Damage Level	Medium
Distribution Level	Medium

According to the Symantec Threat Severity Assessment, overall risk of W32.Changeup!gen40 is now categorized as «Low» — threat type characterized either as low or moderate wild threat (but reasonably harmless and containable) or non-wild threat characterized by an unusual damage or spread routine, or perhaps by some feature of the virus that makes headlines in the news. Read more about Threat Severity Assessment.

More information about W32.Changeup!gen40, you can find on the official site of Symantec Corporation, where in addition to useful information you can find technical details and removal instructions: www.symantec.com

It is also recommended to read the article Network security threats, where you can find a brief description and explanation of the most dangerous security threats plus a few simple tips on how to protect your personal computer from them.