1. Symantec/
  2. Security Response/
  3. One_Half


Risk Level 1: Very Low

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

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

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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