Virus Database

Jerusalem.MBR

Description Jerusalem.MBR

This is a memory resident very dangerous multipartite virus. It infects COM and EXE files (except COMMAND.COM) in the same way as the "Jerusalem" virus does. it also affects the MBR sector of the hard disk and writes itself just after the MBR.
While executing an infected file the virus infects the MBR only, and then returns to the host program. While loading from infected MBR the virus decreases the size of DOS memory, hooks INT 13h and waits for INT 21h address changing. Then the virus increases the DOS memory size and hooks INT 21h which is used for file infection.
Depending on its internal counter the virus erases the disk sectors. The virus contains the text "COMMAND.COM".

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Holiday.3000

Description Holiday.3000

This is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed. After infecting a file the virus tries to infect COMMAND.COM file of the current drive.
On March, 3th the virus displays the message:
+----------------------------------------------------------------+
ƒ ATTENTION! ƒ
ƒ I'm very sorry, today is my holiday. ƒ
ƒ So, I can't serve you, cause I want to play on your computers. ƒ
ƒ ƒ
ƒ DON'T TURN OFF YOUR COMPUTER UNTIL TOMORROW, ƒ
ƒ OR YOUR DATA WILL BE LOST!!! ƒ
ƒ ƒ
ƒ I'll be back to serve you tomorrow. ƒ
ƒ Thank You, ƒ
ƒ ƒ
ƒ AAA ƒ
+----------------------------------------------------------------+

And then wait for March, 4th. Then the viruses display the message and reboots computer:
Thank You for playing, see youall
Please, hit ENTER!
The virus also contains the text string:
apa saja

Holms.6161

Description Holms.6161

It is not a dangerous memory resident parasitic polymorphic virus. It hooks INT 8, 1Ch, 21h, 28h and writes itself to the end of COM and EXE files (except COMMAND.COM) that are executed or opened. On INT 8 and INT 28h calls depending on its counters and system conditions, the virus searches for the files and infects them. The virus contains the text strings:
PATH=COMMAND COMEXE*.*
Copyright 1989-1992. Version 1.05-NC for antivirus program debugging.
Holms.

When both Left/Right Shift keys are pressed, this virus plays a tune. Sometimes it performs a Control-Break call (INT 1Bh).

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