One_Half

Risk Level 1: Very Low

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Updated:: February 13, 2007 11:49:56 AM
Also Known As:: Dis, Free Love, One_half, One Half.3544
Type:: Virus

One_Half is a dangerous virus. It slowly encrypts any hard drive that it infects. The encrypted portion of the drive is available to the user as long as the virus remains in memory. When about half the drive has been encrypted, the virus displays the message:

Dis is one half.
Press any key to continue...

Once the virus is removed, the encrypted data is lost unless the antivirus program is capable of un-encrypting it.

Antivirus Protection Dates

Initial Rapid Release version December 15, 2000
Latest Rapid Release version August 20, 2008 revision 017
Initial Daily Certified version December 15, 2000
Latest Daily Certified version August 20, 2008 revision 016
Initial Weekly Certified release date pending

Click for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

Wild Level: Low
Number of Infections: 0 - 49
Number of Sites: 0 - 2
Geographical Distribution: Low
Threat Containment: Easy
Removal: Easy

Damage

Damage Level: Low

Distribution

Distribution Level: Low

Technical Details

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Internet Security Threat Report, Volume 16