Virus Name: ZZ
V Status: Rare
Discovered: May, 1992
Symptoms: .COM file growth; file date/time changes; message
Eff Length: 429 Bytes
Type Code: PNCK - Parasitic Non-Resident .COM Infector
Detection Method: ViruScan, F-Prot, Sweep, IBMAV, AVTK,
NAV, NAVDX, VAlert, PCScan, ChAV,
NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N,
Removal Instructions: Delete infected files
The ZZ virus was submitted in April, 1992. Its origin or point of
isolation is unknown. ZZ is a non-resident, direct action infector
of .COM programs, including COMMAND.COM.
When a program infected with ZZ is executed, the ZZ virus will
infect all of the .COM programs located in the current directory.
If COMMAND.COM is located in this directory, it will become
Programs infected with the ZZ virus will have a file length increase
of 429 bytes. The virus will be located at the beginning of the
infected file. The program's date and time in the DOS disk
directory listing will have been updated to the current system
date and time when infection occurred. There are no text strings
visible within the viral code.
It is doesn't appear to contain any destructive code, though it
will occassionally display the following message when an infected
program is executed:
"ZZ Top the best !!!"