Virus Database

DrDemon Family

Description DrDemon Family

DrDemon.1816 and 1888
These are very dangerous memory resident encrypted parasitic viruses. They trace INT 21h, hook INT 8 and 21h, and then they write themselves to the end of COM and EXE files that are accessed. The "DrDemon.1816" virus has a bug, and may corrupt files while infecting them. When the file AIDS*.* is accessed, the viruses display:
MUTABOR

The viruses display the same message in about 30 minutes after installation into the system memory.
On the 13th of any month after the 10th infection, the viruses display the following messages:
It is very long story - struggle against virusesall
(c) 1994,95 by Dr. Demon , version 4.0
Make sure all your disks are not bootable now !

and overwrite the hard drive sectors with the same strings.
DrDemon.4634
This is a harmless memory-resident polymorphic multipartite virus. While executing an infected file, the virus infects the hard-drive MBR, hooks INT 21h and stays memory resident. While loading from an infected MBR, the virus cuts 10K of DOS memory (the word at address 0000:0413), hooks INT 1Ch, waits for the DOS-loading process, hooks INT 21h and releases INT 1Ch. When any of the DOS calls Execute or Allocate, Release, Free Memory is intercepted, the virus restores the size of DOS memory, and arranges its block of memory by fixing the MCB list.
By hooking INT 21h, the virus intercepts access to COM and EXE files, and writes itself to the file end. The virus does not infect the files with the names beginning with any of the following variants:
AIDS WEB VB ADINF SCAN CLEAN DRW

The virus also contains the text string:
MB Pro (c) 1994,95 by Dr.Demon

Check other viruses! Be aware! Use Antiviral Software

Macro.Word.Dub

Description Macro.Word.Dub

This is a very dangerous encrypted macro virus. It contains 12 macros that are copied to 13 macros while infecting documents and the global macros area:
Documents NORMAL.DOT
1 AutoExec AutoExec Infects global macros area
2 Annihilator FileSaveAs Infects documents
Annihilator
3 FCDub FCDub Infects global macros area
FileClose
4 Message Message
5 NewDocInsert NewDocInsert
6 SearchDestroyer SearchDestroyer
SDDuplicate
7 ExeKiller ExeKiller
8 AEDub AEDub
9 AutoExit
10 FileTemplates FileTemplates
11 ToolsMacro ToolsMacro
12 KillIt KillIt

The virus also searches for *.DOC files on the C: drive, replaces their contents with the text "666" and infects them, if they are of Word format. While searching and infecting DOC files the virus creates a log file and writes the following text to there:
********************************************************
WinWord.Satan-Bug Macro Virus
Created by WinWord Virus Generator (Baku, Azerbaijan)
DATA DESTRUCTION PROTOCOL
********************************************************
Log file generated
Killed:
Total number of infected files(provided no macro interruption took place):
Comments: There are some real smart people in Azerbaijan that know what's
happeningall They are capable of generating powerful macro viruses...
This virus is one of them but more sophisticated ones are coming up...
WinWord.Satan-Bug will be back...
Virus ID number: 666
End of Protocol
********************************************************

The virus also corrupts disk files, displays MessageBoxes:
This file has caused a fatal error (exception 06) at address 0000:00053B4.
Data loss might be inevitable. Press OK to fix this problem...
ATTENTION!!! Do not interrupt while Microsoft Word is fixing this problem!
This may result in severe file damage...
WinWord.Satan-Bug
For more details on this operation check out the 'C : DDP' directory on
your hard disk...
Wait, please ... Microsoft Word has found 13 missing strings at address
0000:4BC1 which belong to a file in use. To avoid data loss, Word has to
search your disk for all .doc files and attach the missing string to a
corresponding file. Press OK to continue ...

The virus overwrites the C:AUTOEXEC.BAT file with text:
@echo off
cls"
Echo Hey, sucker!!!
Echo Your computer is infected with WinWord.Satan-Bug virus...
pause

It also renames the main menu:
File -> WW.Satan-Bug
Edit -> Concept
View -> Nuclear
Insert -> DMV
Format -> NPad
Tools -> Wazzu
Table -> Satanic
Window -> Tedious
Help -> Other...

Macro.Word.Dude

Description Macro.Word.Dude

This is a very dangerous encrypted macro virus. It contains four macros: AutoOpen, FileSaveAs, ToolsMacro (stealth), FilePrintDefault. The virus infects the global macros area (NORMAL.DOT) on opening an infected document and writes itself to documents that are saved with new name.
On April 4th the virus format the hard drive and displays the MessageBox:
Its c++l DuDe's Birthday!!

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