Virus Name: 66A
V Status: Rare
Discovery: April, 1992
Symptoms: .COM file growth; file date/time change; program execution
failure; "Too many files open" error message
Eff Length: 512 Bytes
Type Code: PNCK - Parasitic Non-Resident COM Infector
Detection Method: F-Prot, Sweep, ViruScan, AVTK, NAVDX, VAlert,
IBMAV, NAV, PCScan, ChAV,
NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N,
Removal Instructions: Delete infected files
The 66A virus was received in April, 1992. Its origin or point of
isolation are unknown. This virus is a memory resident infector of
.COM files, including COMMAND.COM.
When a program infected with the 66A virus is executed, this virus
will search the current directory to locate all previously
uninfected .COM files. As the uninfected .COM files are found, the
virus will infect them.
Programs infected with the 66A virus will have a file length
increase of 512 bytes with the virus being located at the end 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.
The following text strings can be found within all 66A infected
The "66A" text string is used by the virus to determine if the
file was previously infected, and is located at the end of the
Programs infected with the 66A virus may fail to execute properly,
or unusual error messages may occur, such as "Too many files open".