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Symantec.com > Security Response > Threats and Risks > W95.CIH.1049
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W95.CIH.1049 - Removal

Risk Level 2: Low

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Discovered: April 30, 2002
Updated: February 13, 2007 11:58:35 AM
Also Known As: Bloodhound.W32.EP
Type: Virus
Systems Affected: Windows 95, Windows 98, Windows Me



Do one of the following:
  • If your computer can boot from the CD-ROM drive and you are using Norton AntiVirus 2001 or later:
    1. Place the Norton AntiVirus CD into the CD-ROM drive, and restart the computer.
    2. When the menu appears, proceed to scan and repair viruses.
    3. When the scan has finished, remove the CD from the CD-ROM drive and restart the computer.
    4. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
    5. Run a full system scan.
    6. If any files are detected as infected by W95.CIH.1049 , click Repair.
  • If your computer cannot boot from the CD-ROM drive or if you are using Norton AntiVirus 2000 or earlier:
    1. Install Norton AntiVirus on an uninfected computer.
    2. Run LiveUpdate, and then run a full system scan.
    3. On the NAV toolbar, click Rescue.
    4. Follow the prompts to create a Basic Rescue set.
    5. Take the completed Basic Rescue set to the infected computer, and insert the "Basic Rescue Boot Disk" into the floppy disk drive. Restart the computer.
    6. When the Rescue Disk window appears, use the arrow keys on the keyboard to select Norton AntiVirus.
    7. On the command line at the bottom of the window, edit the line to read as follows:

      navdx /a /b+ /m+ /repair /cfg:a /log:c:\nvreplog.txt

      and then press Enter.
    8. After the scan has finished, repeat steps 6 through 8 again; this time edit the command line to read as follows:

      navdx /a /b+ /m+ /delete /cfg:a /log:c:\nvdellog.txt

      and then press Enter.
    9. When the scan has finished, the removal process is complete. Remove all disks from the disk drives, and restart the computer.
    10. Start Norton AntiVirus (NAV), and make sure that NAV is configured to scan all files. For instructions on how to do this, read the document How to configure Norton AntiVirus to scan all files.
    11. Run a full system scan.
    12. If any files are detected as infected by W95.CIH.1049, click Repair.


Writeup By: Douglas Knowles
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