Virus Database

Hero.394

Description Hero.394

These are not dangerous memory resident parasitic viruses. They copy themselves to the Interrupt Vectors Table at the address 0000:0200, hook INT 21h, and write themselves to the end of the files that are executed.
"Hero.394" infects only EXE files, "Hero.506" infects both EXE and COM files. As a read/write buffer these viruses use video memory.
While setting Interrupt Vector (INT 21h, AH=25h) with a number greater than 7Fh, "Hero.506" disinfects itself in the memory.
On the 1st of any month these viruses decrypts and display the following messages in Russian: "GLORY TO HEROES!" or "The author of the virus is a cretin" depending on the version of the virus.

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Bash.3241

Description Bash.3241

These are dangerous memory resident polymorphic parasitic viruses. They hook INT 21h and write themselves to the end of COM and EXE files that are executed or opened. The viruses also affect ARJ archives and insert an infected dropper file into them. The viruses use many anti-debugging tricks, which are buggy, and often halt the system because of that.
The viruses perform several actions directed to disable anti-viruses. First of all, while installing memory resident, they look for TBAV anti-virus driver in the memory, and disable it. They also looks for anti-virus data files, and delete them:
ANTI-VIR.DAT CRC.SVS MSAV.CHK BOOT.MS
ANTIVIR.DAT CRC_.SVS SMARTCHK.CPS BOOT.NTZ
ANYCHECK.VAL FILES.VVL TBUTIL.DAT BOOT.TAV
AVP.CRC FINGERP.VVF ZZ##.IM IV.INI
CHKLIST.CPS IM.PRM _ADINF.INI PART.NTZ
CHKLIST.MS IVB.INI AV.CRC VIRSORT.DAT
CHKLIST.TAV IVB.NTZ BOOT.CPS TBUTIL.DAT

The viruses also patch the AVP 2.x package, if it is installed. They creates the BIZATCH.AVB database in the AVP directory, and register it in the AVP.SET file. See "Anti-AVP" for more details.
From September 17th till October the viruses attampt to erase disk sectors and displays a picture, but fails because of a bug. The picture looks like follows:
all. NO! ... ... MNO! ...
..... MNO!! ...................... MNNOO! ...
..... MMNO! ......................... MNNOO!! .
.... MNOONNOO! MMMMMMMMMMPPPOII! MNNO!!!! .
... !O! NNO! MMMMMMMMMMMMMPPPOOOII!! NO! ....
...... ! MMMMMMMMMMMMMPPPPOOOOIII! ! ...
........ MMMMMMMMMMMMPPPPPOOOOOOII!! .....
........ MMMMMOOOOOOPPPPPPPPOOOOMII! ...
....... MMMMM.. OPPMMP .,OMI! ....
...... MMMM:: o.,OPMP,.o ::I!! ...
.... NNM:::.,,OOPM!P,.::::!! ....
.. MMNNNNNOOOOPMO!!IIPPO!!O! ..... ,
... MMMMMNNNNOO:!!:!!IPPPPOO! .... ***** ================-
.. MMMMMNNOOMMNNIIIPPPOO!! ...... AuRoDrEpH.....
...... MMMONNMMNNNIIIOO!.......... The Drow
....... MN MOMMMNNNIIIIIO! OO .......... Was Back !!!
......... MNO! IiiiiiiiiiiiI OOOO ...........
...... NNN.MNO! . O!!!!!!!!!O . OONO NO! ........
.... MNNNNNO! ...OOOOOOOOOOO . MMNNON!........
...... MNNNNO! .. PPPPPPPPP .. MMNON!........
...... OO! ................. ON! .......

The viruses also deletes disk files. In the root directories of all available logical drives they delete the "?????x??.*" files, where "x" is drive's letter. They also look for the SYSTEMIOSUBSYSHSFLOP.PDR file in the Windows directory, and delete it.
The viruses contain the text strings:
CARO: Please label this creation Hare.Little_Brother :-) or if you
want BSHME.Buggy.7xxx - This version is for educational purpose only!
Greetx to all virus writers! Still buggy but it works...
-=[ 1996 ]=-
-=[ U$A ]=-
-=[ BSHME ]=-

Bashar.670

Description Bashar.670

These are dangerous memory resident encrypted parasitic viruses, to decrypt themselves they use i387 instructions in decryption loops. They hook INT 21h and write themselves to the end of COM files that are executed. Because of a bug they may corrupt files while infecting them. The viruses contain the text string:
"[Bashar_Teg] by C.W. - 1997 (JAofM)"

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