I-Worm.Blebla
Details
I-Worm.Blebla.a
This is a worm virus spreading via the Internet. It was discovered in Poland on November 16, 2000. The worm appears as an e-mail message that has the HTML format and has two attached files: MYJULIET.CHM and MYROMEO.EXE.
When an infected message is opened, the HTML part of it is executed. This part contains a script program that is automatically activated by Windows. By using a vulnerability in Windows scripting, the script program loads and activates the CHM component of the message (the MYJULIET.CHM file). That CHM component is a Compressed HTML page itself and contains one more script program in it. That second script executes the MYROMEO.EXE file, which is the main worm body itself.
So, the worm activates itself automatically when an infected message is being opened or previewed. To activate itself, the worm uses a vulnerability in Windows scripting security: the worm’s HTML component is able to run a EXE component by a method that is listed in “save scripting,” so no warning messages are displayed when the worm runs its components (under default Windows settings).
The main worm component (MYROMEO.EXE file) is a Windows PE executable file about 30Kb in length. This file is compressed by a UPX compression utility. Being unpacked, it appears to be a 70Kb EXE file written in Delphi, and the “pure” code in the file occupies just about 6Kb.
When it is run, it opens the Windows Address Book, reads E-mail addresses from there and sends its HTML message with attached CHM and EXE files there. The message has a Subject that is randomly selected from the following list:
Romeo&Juliet
:))))))
hello world
!!??!?!?
subject
ble bla, bee
I Love You 
sorryall
Hey you !
Matrix has you…
my picture
from shake-beer
The worm has a bug and doens’t work correctly under some Windows98/NT English editions. The worm also is able to spread only in case Windows is installed to C:\WINDOWS directory (that is hardcoded in worm code).
Blebla.b
A remake of original worm. When starts it copies itself to system with “c:\windows\sysrnj.exe” name and creates and modifies many Registry key to activate this copy:
HKEY_CLASSES_ROOT\rnjfile
\DefaultIcon = %1
\shell\open\command = sysrnj.exe “%1″ %*
this key caused worm copy run when “rnjfile” is referred. Then the worm modifies key:
HKEY_CLASSES_ROOT \.exe = rnjfile
\.jpg = rnjfile
\.jpeg = rnjfile
\.jpe = rnjfile
\.bmp = rnjfile
\.gif = rnjfile
\.avi = rnjfile
\.mpg = rnjfile
\.mpeg = rnjfile
\.wmf = rnjfile
\.wma = rnjfile
\.wmv = rnjfile
\.mp3 = rnjfile
\.mp2 = rnjfile
\.vqf = rnjfile
\.doc = rnjfile
\.xls = rnjfile
\.zip = rnjfile
\.rar = rnjfile
\.lha = rnjfile
\.arj = rnjfile
\.reg = rnjfile
these keys cause worm copy start when any of files listed above are opened.
The worm sends itself to alt.comp.virus newsgroups with messages:
From: “Romeo&Juliet” [romeo@juliet.v]
Subject:[Romeo&Juliet] R.i.P.
While sending its copies to personal address the worm uses empty Subject, random generated Subject, or one from the list:
Romeo&Juliet
where is my juliet ?
where is my romeo ?
hi
last wish ???
lol 
,,…’
!!!
newborn
merry christmas!
surprise !
Caution: NEW VIRUS !
scandal !
^_^
Re:
Depending on some conditions the worm also created disk directories with random name in \Recycled folder and creates random named files in there.
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