Virus Database

MJ.1513.a

Description MJ.1513.a

This is a very dangerous memory-resident virus which writes itself into the MBR of the hard disk as soon as an file is started and into .COM- files whenever they are started. The old contents of the MBR is saved at the location 0/0/2 (head/track/sector). COM-files are affected by standard way.
Whenever an infected .COM-file is started the virus installs its TSR copy into the memory, displays the message "Bad command or file name" and returns to DOS. On the 100th reboot from the infected hard disk the first 16 sectors of it are wiped out. On every 256th read operation from an infected disk (INT 13h) the virus placed the word 'mj' into the block that has been read at the location C8h. The virus hooks INT 13h, 1Ch, 21h.

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Glue.4000.a

Description Glue.4000.a

It is a very dangerous memory resident multipartite virus. It writes itself to the end of .COM and .EXE files and to the MBR of the hard drive and boot sectors of floppy disks. The virus is encrypted in files. While accessing to infected disk sectors the virus calls its stealth routine.
When an infected file is executed, the virus hooks INT 21h and stays memory resident. It then infects the files that are executed or opened. Before infecting a file, the virus infects current disk (MBR in case of hard drive, or boot sector in case of floppy disk). While infecting a disk the virus overwrites the boot or MBR sector, then writes its code and original boot/MBR sector to the disk sectors that are then marked as bad ones. Reinfection of disks and files is possible. In some cases the virus corrupts the floppy disk boot sector while infecting. The virus also has other bugs and may halt the system while infecting a file.
On FindFirst/Next DOS calls the virus calls its stealth routine and shows decreased length of infected files. When BACKUP.COM or CHKDSK.COM utilities are run, the virus disables that routine.
While loading from infected disk the virus hooks INT 13h, waits for DOS loading process, then hooks INT 21h and INT 9 (keyboard). INT 9 handler contains a counter and increases it on any keystroke. When this counter reaches 10000, the virus starts to disable writing to disk (INT 13h) without any error message or return code. That will corrupt the files while writing to them.
The variants of this virus contain the text strings:
"Glue.4000.a":
COMEXEBACKUP.COMCHKDSK.COM
The Digital Glue (C) 1990,1991 by Eastern Digital
1900 Timi$oara
THE END

"Glue.4000.b":
COMEXEBACKUP.COMCHKDSK.COM
Lipici (C) 1991 by Eastern Digital
1900 Timi$oara

Gly.1182

Description Gly.1182

It is not a dangerous memory resident partly encrypted parasitic virus. It writes itself to the end of .COM files. When an infected file is executed, the virus infects the C:COMMAND.COM file, then hooks INT 21h and infects .COM files on DOS calls FindFirst/Next FCB (DIR command). If an infected program is executed on May 25th at 13:xx, the virus displays the message and plays a tune:
Happy birthday to you,Dear Yang !

The virus also contains the text strings:
G L Y Serial Number:

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