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  3. JHC.1634

JHC.1634

Risk Level 1: Very Low

Discovered:
January 30, 2003
Updated:
February 13, 2007 11:57:40 AM
Type:
Virus
Systems Affected:
Windows 2000, Windows 3.x, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

JHC.1634 is a memory-resident DOS virus that infects the .exe, and .com files, as well as the Master Boot Record (MBR). The size of the infected files are increased by 1,634 bytes.

If the virus is executed from:
  • A file, the free conventional memory is reduced by 3,674 bytes.
  • The MBR, the total conventional memory is reduced by 4 KB.

JHC.1634 carries a destructive payload. If the virus is executed on June 17th, it attempts to overwrite with blank content any loaded and executed programs.

NOTE: Definitions dated prior to January 31, 2003 may detect this threat as Bloodhound.ResCOM or Bloodhound.ResEXE.

Antivirus Protection Dates

  • Initial Rapid Release version January 31, 2003
  • Latest Rapid Release version January 31, 2003
  • Initial Daily Certified version January 31, 2003
  • Latest Daily Certified version January 31, 2003
  • Initial Weekly Certified release date February 5, 2003
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Robert X Wang

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