Virus Name: 337
Aliases: F1-337, V337
V Status: Rare
Discovery: May, 1991
Symptoms: .COM file growth; TSR
Eff Length: 337 Bytes
Type Code: PRsC - Parasitic Resident .COM Infector
Detection Method: ViruScan, F-Prot, AVTK, Sweep, NAV, NAVDX,
IBMAV, VAlert, PCScan, ChAV,
NShld, Sweep/N, LProt, Innoc, NProt, AVTK/N, NAV/N,
Removal Instructions: Delete infected files
The 337 virus was received from Europe in May, 1991. 337 is a
memory resident infector of .COM programs. It does not infect
The first time a program infected with 337 is executed, the virus
will install itself memory resident as a low system memory TSR of
944 bytes. Interrupt 21 will be hooked by the virus.
Once 337 is memory resident, it will infect .COM programs, other
than COMMAND.COM, when they are opened or executed. Programs
infected with 337 will increase in length by 337 bytes with the
virus being located at the end of infected files. The program's
date and time in the disk directory will not be altered.
337 does not do anything besides replicate.