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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

CIH.1003.B

Threat LevelModerate threatDamageHighDistributionNot widespread
Common name:CIH.1003.B
Technical name:W95/CIH.1003.C
Threat level:Low
Alias:W95/CIH, PE/CIH; CIH.C; CIHV; W95/CIH-10xx; CHERNOBYL; TSHERNOBYL; SPACEFIL
Type:Virus
Effects:  

It deletes the content of the hard disk, preventing the computer from starting. It deletes the startup information from the BIOS.

Affected platforms:

Windows 95

First detected on:
Detection updated on:March 17, 2006
StatisticsNo
Country of origin:TAIWAN
Family:Chernobyl

Brief Description 

    

CIH.1003 is a resident virus that activates every April 26. It was given this name because the date coincides with the commemoration of the nuclear disaster that took place in Chernobyl in 1986.

This virus is extremely dangerous, as it deletes the content of the hard disk, preventing Windows NT/98/95 computers from starting up. It also infects files with an EXE extension, but only in Windows 98/95 computers.

In computers with an Intel Pentium microprocessor, it deletes the content of the BIOS.

CIH.1003 does not spread using its own means, but it infects other files. It reaches computers when these infected files are distributed, which can enter computers through any of the typical means of tranmission, which include, among others, floppy disks, e-mail messages with attached files, Internet downloads, FTP, IRC channels, peer-to-peer file sharing programs (P2P), etc.

Visible Symptoms 

    

CIH.1003 is easy to recognize once it has infected a computer, as several symptoms can be noticed:

  • When the computer is started up, the following message is displayed:

    DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER

    This message indicates that the computer cannot be started. The reason for this is that CIH.1003 has formatted the hard disk.
  • If the computer is booted from another disk and then the C: drive is accessed, the following warning is displayed:

    INVALID DRIVE SPECIFICATION

    This means that the system does not recognize the hard disk because it is completely blank.