Trojan.Ransomlock.J is a Trojan horse that locks the desktop making the computer unusable. It then asks the user to pay to have it unlocked.

The threat Trojan.Ransomlock.J was discovered by Symantec Security Response Threat Severity Assessment on February 22, 2012 and was classified as Trojan.

Initial Daily Certified version of virus definitions for Norton security products was released on February 22, 2012 revision 016. 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.

Trojan.Ransomlock.J Threat Assessment

Component	Severity
Wild Level	Low
Number of Infections	0 - 49
Number of Sites	0 - 2
Geographical Distribution	Low
Threat Containment	Easy
Removal	Easy
Damage Level	Medium
Distribution Level	Low

According to the Symantec Threat Severity Assessment, overall risk of Trojan.Ransomlock.J is now categorized as «Very Low» — poses little threat to users; rarely even makes headlines; no reports in the wild. Read more about Threat Severity Assessment.

This threat affect the following operating systems:

• Windows 98
• Windows 95
• Windows XP
• Windows Me
• Windows Vista
• Windows NT
• Windows Server 2003
• Windows 2000

More information about Trojan.Ransomlock.J, 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.