In addition to redirection for the boot information, these viruses attack .COM and .EXE files when opened or copied and hides the file size changes from the DIR command. The major problem arises when an attempt is made to use CHKDSK/F and there appears to be a difference in the reported files size and the apparent size. CHKDSK assumes this is the result of some cross-linked files and attempts to repair the damage. The result is the destruction of the files involved. The FRODO or 4096 virus is famous for this kind of damage.

Full Stealth Virus - In this case, ALL normal calls to file locations are cached while the virus subtracts its own length so that it appears clean. See also Stealth Virus, and File Stealth Virus.

Updated On: 04.03.28