I-Worm.LoveLetterThis is the Internet worm caused the global epidemic worldwide in beginning of
May 2000. The worm spreads via E-mail by sending infected messages from
affected computers. While spreading the worm uses MS Outlook and sends itself
to all addresses that are stored in MS Outlook Address Book. As a result an
infected computer sends as many messages, as many addresses are kept in MS
Outlook contacts list.
The worm is written in the scripting language Visual Basic Script (VBS). It does
work only on computers on which the Windows Scripting Host (WSH) is installed.
In Windwos 98 and Windows 2000, WHS is installed by default. To spread itself
the worm accesses MS Outlook and uses its functions and address lists. That is
available in Outlook 98/2000 only, so the worm is able to spread only in case one
of these MS Oulook versions is installed.
When run the worm sends its copies by email, installs itself into the system,
performs destructive actions, downloads and installs a trojan program. The worm
also have ability to spread through mIRC channels.
The worm contains copyright strings:
barok -loveletter(vbe) < i hate go to school >
by: spyder / ispyder@mail.com / @GRAMMERSoft Group /
Manila,Philippines
Spreading
The worm arrives to a computer as email message with attached VBS file, that is
worm itself. The message in original worm version has:
The Subject: ILOVEYOU
Message body: kindly check the attached LOVELETTER coming from me.
Attached file name: LOVE-LETTER-FOR-YOU.TXT.vbs
Being activated by a user (by double click on attached file) the worm opens MS
Outlook, gets access to the Address Book, gets all addresses from there and
sends messages with its attached copy to all of them. The message subject,
body and attached file name are the same as above.
The worm also installs itself into the system. It creates its copies in Windows
directories with the names:
in Windows directory: WIN32DLL.VBS
in Windows system directory: MSKERNEL32.VBS, LOVE-LETTER-FOR-YOU.TXT.VBS
These files are then registered in Windows auto-run section in system registry:
HKLMSoftwareMicrosoftWindowsCurrentVersionRunMSKernel32
= MSKERNEL32.VBS
HKLMSoftwareMicrosoftWindowsCurrentVersionRunServicesWin32DLL
= Win32DLL.VBS
As a result the worm is re-activated each time Windows boots up.
The worm also creates a HTM dropper in Windows system directory to use it
while spreading to mIRC channels (see below). This copy has the name:
LOVE-LETTER-FOR-YOU.TXT.HTM
Downloading a trojan file
To install trojan program to the system the worm modifies the URL to Internet
Explorer start page. New URL points to a Web-site (randonly selected from four
variants) and forces Explorer to download an EXE-file from there. That file has the
WIN-BUGSFIX.EXE name and is the trojan program. The worm then registers this
file in system registry in auto-run section:
HKLMSoftwareMicrosoftWindowsCurrentVersionRunWIN-BUGSFIX
= WIN-BUGSFIX.exe
On next run Internet Exlorer downloads the trojan and stores it in Download
directory in the system. On next Windows startup the trojan gets control, copies
itself to Windows system directory with WINFAT32.EXE name.
When trojan is installed into the system the worm sets the Internet Explorer start
page to blank ( about:blank ).
The downloaded and installed file is a password stealing trojan. It gets local
machine name and IP address, network login(s) and password(s), RAS
information, e.t.c, and sends to trojan host. The samples that were analyzed send
messages to mailme@super.net.ph , the message subject looks like follows:
Barok... email.passwords.sender.trojan
Spreading to IRC channels
The worm scans local drives and looks for files:
MIRC32.EXE, MLINK32.EXE, MIRC.INI, SCRIPT.INI, MIRC.HLP
In case at least one of these files is found in a subdirectory, the worm drops a
new SCRIPT.INI file to there. That file contains mIRC instructions that send worm
copy (the LOVE-LETTER-FOR-YOU.TXT.HTM file) to all users that join to infected
IRC channel.
The SCRIPT.INI file contains the comments:
mIRC Script
Please dont edit this script... mIRC will corrupt, if mIRC will
corrupt... WINDOWS will affect and will not run correctly. thanks
Khaled Mardam-Bey
http://www.mirc.com
When an IRC user gets that infected HTML it is copies to IRC download directory.
The worm then is activated from that file only in case the user clicks on it.
Because browser's security settings don't allow scripts to access disk files and
display a warning message, the worm uses a trick to avoid that. First it displays a
message to fool the user:
This HTML file need ActiveX Control
To Enable to read this HTML file
- Please press 'YES' button to Enable ActiveX
In case the user really clicks 'YES' the worm gets access to disk files and installs
itself into the system. It drops its VBS code to Windows system directory with
the MSKERNEL32.VBS name and registers it in Windows auto-run section in
system registry:
HKLMSoftwareMicrosoftWindowsCurrentVersionRunMSKernel32
= MSKERNEL32.VBS
In case of 'NO' the worm intercepts mouse movement and keypress events, and
reloads itself then. As a result, user get warning message in endless loop until it
presses 'YES'.
Destructive actions
The worm scans subdirectory trees on all available local and mapped drives, lists
all files there and depending on filename extension performs actions:
VBS, VBE: the worm overwrites these files with its VBS body. As a result
all VBS and VBE programs in the system are overwritten with worm code.
JS, JSE, CSS, WSH, SCT, HTA: the worm creates a new file with original
filename plus .VBS extention and deletes original file, i.e. the worm
overwrites these files with its code and renames them with VBS extension.
For example, TEST.JS becowes TEST.VBS .
JPG, JPEG: the worm does the same as above, but adds .VBS
extension to full file name (does not rename to .VBS ). For example,
PIC1.JPG becomes PIC1.JPG.VBS .
MP2, MP3: the worm creates a new file with .VBS extension (for
SONG.MP2 the worm creates the SONG.MP2.VBS file), writes its
code to there and sets the file attribute hidden for the original file.
Other variants
The worm itself is a text script program, and it is spread in text source form. The
worm's code may be easily modified by hackers, and as a result there are many
variants of the original worm. Most of them are just minor remakes and differ to
original worm just in details - there are message fields text changed, different file
names, different set of affected disk files extensions (for example, .BAT and .INI).
The Subject, message body and attached file name in different variants look like
listed below (the first block belongs to original worm version):
Subject/body/attach name
ILOVEYOU
kindly check the attached LOVELETTER coming from me.
LOVE-LETTER-FOR-YOU.TXT.vbs
Mothers Day Order Confirmation
We have proceeded to charge your credit card for the amount of $326.92
for the mothers day diamond special. We have attached a detailed
invoice to this email. Please print out the attachment and keep it in a
safe place.Thanks Again and Have a Happy Mothers Day!
mothersday@subdimension.com
mothersday.vbs
fwd: Joke
- no message body in message
Very Funny.vbs
Susitikim shi vakara kavos puodukui...
kindly check the attached LOVELETTER coming from me.
LOVE-LETTER-FOR-YOU.TXT.vbs
Important ! Read carefully !!
Check the attached IMPORTANT coming from me !
IMPORTANT.TXT.vbs
Dangerous Virus Warning
There is a dangerous virus circulating.
Please click attached picture to view it and learn to avoid it.
virus_warning.jpg.vbs
How to protect yourself from the IL0VEY0U bug!
Here's the easy way to fix the love virus.
Virus-Protection-Instructions.vbs
Thank You For Flying With Arab Airlines
Please check if the bill is correct, by opening the attached file.
ArabAir.TXT.vbs
Bewerbung Kreolina
Sehr geehrte Damen und Herren!
BEWERBUNG.TXT.vbs
LOOK!
hehe...check this out.
LOOK.vbs
Variant Test
This is a variant to the vbs virus.
IMPORTANT.TXT.vbs
Yeah, Yeah another time to DEATH...
This is the Killer for VBS.LOVE-LETTER.WORM.
Vir-Killer.vbs
I Cant Believe This!!!
I Cant Believe I Have Just Recieved This Hate Email .. Take A Look!
KillEmAll.TXT.vbs
New Variation on LOVEBUG Update Anti-Virus!!
There is now a newer variant of love bug. It was released at
8:37 PM Saturday Night. Please Download the fo llowing patch.
We are trying to isolate the virus. Thanks Symantec.
antivirusupdate.vbs
IMPORTANT: Official virus and bug fix
This is an official virus and bug fix. I got it from our system admin.
It may take a short while to update your system files after you run the
attachment.
Bug and virus fix.vbs
Recent Virus Attacks-Fix
Attached is a copy of a script that will reverse the effect of
the LOVE-LETTER-TO-YOU.TXT.vbs as well as the FW:JOKE,
Mother's Day and Lituanian Siblings.
BAND-AID.DOC.vbs
PresenteUOL
O UOL tem um grande presente para voce, e eh exclusivo.
Veja o arquivo em anexo.
http://www.uol.com.br
UOL.TXT.vbs
BUG & VIRUS FIX
I got this from our system admin. Run this to help pervent a ny recent or
future bug & virus attack's. It may take a small while up update your files.
MAJOR BUG & VIRUS FIX.vbs
FREE SEXSITE PASSWORDS
cHECK IT OUT ; FREE SEX SITE PASSWORDS.
FREE SEXSITE PASSWORDS.HTML.vbs
You May Win $1,000,000! 1 Click Away
kindly check the attached WIN coming from me.
WIN.vbs
Virus Warnings !!!
VERY IMPORTANT PLEASE READ THIS TEXT. TEXT ATTACHMENT.
very-important-txt.vbs
HOW TO BEAT VIRUSES
kindly check the attached VIRUS INFORMATION coming from me.
This is how you can be immune to any virus. It really helps alot!
HOW_TO_BEAT_VIRUSES.TXT.vbs
You must read this!
Have you read this text? You must do it!!
C:NOTES.TXT.exe
New virus discovered!
A new virus has been discovered! It's name is @-@Alha and Omega@-@.
Full list of virus abilities is included in attached file @-@info.txt@-@.
For the last information go to McAfee's web page
Please forward this mesage to everyone you care about.
info.txt.vbs
Wish you were Here!
Wish you were Here! Im having a great time!
Wish you were Here!.postcard.vbs
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