Virus Name: 572
V Status: Rare
Discovery: April, 1992
Symptoms: .EXE file growth; file date/time changes; decrease in total
system and available free memory
Eff Length: 572 Bytes
Type Code: PRhE - Parasitic Resident .EXE Infector
Detection Method: ViruScan, AVTK, F-Prot, Sweep, IBMAV,
NAV, NAVDX, VAlert, PCScan, ChAV,
NShld, Sweep/N, LProt, Innoc, NProt, AVTK/N,
Removal Instructions: Delete infected files
The 572 virus was received in April, 1992. Its origin or point of
isolation is unknown. This virus is a memory resident infector of
The first time a program infected with the 572 virus is executed,
this virus will install itself memory resident at the top of system
memory but below the 640K DOS boundary. Total system and available
free memory, as indicated by the DOS CHKDSK program, will have
decreased by 1,024 bytes. Interrupts 21 and 24 will be hooked by
the 572 virus in memory.
Once the 572 virus is memory resident, it will infect .EXE programs
as they are executed. Infected programs will have a file length
increase of 572 bytes with the virus being located at the end of
the infected file. The program's date and time in the DOS disk
directory will have been updated to the system date and time when
It is unknown if 572 does anything besides replicate.
Known variant(s) of 572 are:
572-COD: A minor variant of the 572 virus, this variant has three
bytes which differ.
Origin: Unknown May, 1992.