Virus Name: Grapje
Aliases: 1012 + 27, 1039, Dutch 1039
V Status: Rare
Discovered: September, 1991
Symptoms: .COM file growth; system hangs; screen display scrolling;
long program loads
Origin: The Netherlands
Eff Length: 1,039 Bytes
Type Code: PNCK - Parasitic Non-Resident .COM Infector
Detection Method: ViruScan, Sweep, F-Prot, AVTK, NAV,
IBMAV, NAVDX, VAlert, PCScan, ChAV,
NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N,
Removal Instructions: Delete infected files
The Grapje, 1012 + 127, 1039, or Dutch 1039 virus was received from
Jan Terpstra of The Netherlands in September, 1991. Grapje is a
non-resident direct action infector of .COM files, including
When a program infected with Grapje is executed, the virus will
search the current directory looking for an uninfected .COM file
to infect. If an uninfected .COM file is found, it will become
infected. If COMMAND.COM exists in the current directory, it may
become infected with Grapje. If an uninfected file was not found
in the current directory, then Grapje will search the disk's
directory structure looking for an uninfected file to infect.
Programs infected with Grapje increase in size by 1,039 bytes. The
virus will be located at the beginning of the infected file. There
will be no visible change to the file's date and time in the DOS
disk directory. The following text strings can be found within
the Grapje virus in infected files:
Execution of some infected programs will result in a system hang.
When the system hang occurs, two .COM programs will have been
infected by Grapje, instead of the usual one.
Occassionally, Grapje will display a screen effect when an infected
program is executed. Randomly, Grapje will fill the screen buffer
with random data from memory, scrolling the system display. When
this occurs, the only way to stop it is to reboot the system.
Additionally, the virus contains code to display the "GRAPJE!!"
string repeatedly, scrolling the screen after 30 days have elasped
since the time the user started to execute the program. Unless the
user started to execute the program right before midnight on the
last day of a month, and at exactly the right split second, this
display will never be seen.