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Aliases  I-Worm.Lentin.k,WORM_YAHA.M,W32.Yaha.M@mm
Typical Symptoms  DoS attack,Displays message box,Sends email,Creates file,Process shuts down,Changes Homepage address
Discovered  [korea] 2003-03-26
 [Foreign] 2003-01-06
Type  I-Worm ActiveField  Win32
Origin  India Encryption  NO
Location  None Memory residence  NO
Scan engine needed
2003-03-27 [Able to detect & repair]
  • Free trial download

I-Worm.Win32.Yaha.28672 is another variant of Yaha.

How it spread

I-Worm.Win32.Yaha.28672 spreads itself via email. It retrieves email addresses from the following:

- Windows address book
- User registered in .NET messenger
- User registered in MSN messenger
- Yahoo Pager
- File with the extension, HT.

* Mail subject : (Mail subject is selected from the following list.)

- Are you the BEST
- Free Win32 API source
- Learn SQL 4 Free
- I Love You..
- Wanna be like a stone ?
- Are you a Soccer Fan ?
- Sexy Screensavers 4 U
- Check it out
- Sample Playboy
- Hardcore Screensavers 4 U
- XXX Screensavers 4 U
- We want peace
- Wanna be a HE-MAN
- Visit us
- One Virus Writer's Story
- One Hacker's Love
- World Tour
- Whats up
- Wanna be my sweetheart ??
- Screensavers from Club Jenna
- Jenna 4 U
- Free rAVs Screensavers
- Feel the fragrance of Love
- Wanna Hack ??
- Sample KOF 2002
- The King of KOF
- Wanna Brawl ??
- Wanna Rumble ??
- Play KOF 2002 4 Free
- Demo KOF 2002
- Free Demo Game
- Wanna be friends ??
- Need money ??
- Are you beautiful
- Who is your Valentine
- Free Screenavers of Love
- Free XXX
- Free Screensavers
- WWE Screensavers
- Freak Out
- Wanna be friends ?
- Things to note
- Lovers Corner
- Patch for Elkern.gen
- Patch for Klez.H
- Free Screensavers 4 U
- Project
- Sample Screensavers
- Are you in Love
- I am in Love
- I Love You
- You are so sweet
- The Hotmail Hack
- U realy Want this
- to ur lovers
- to ur friends
- Find a good friend
- Learn How To Love
- Are you looking for Love
- Wowwwwwwwwwww check it
- Check ur friends Circle
- The world of Friendship
- Shake it baby
- How sweet this Screen saver
- war Againest Loneliness
- Need a friend?
- Say 'I Like You' To ur friend
- love speaks from the heart
- Let's Dance and forget pains
- Looking for Friendship
- True Love
- make ur friend happy
- Who is ur Best Friend
- hey check it yaar
- Check this shit
- Hello
- Hi

*Body text (Body text is selected from the following list.)

(Mail text 1)
did u always dreamnt of hacking ur friends hotmail account..
finally i got a hotmail hack from the internet that really works..
ur my best friend thats why sending to u..
check it..just run it..enter victim's address and u will get the pass.
check the attached love screensaver
and feel the fragrance of true love..
check the attached screensaver..
its really wonderfool..
i got it from

(Mail text 2)
check ur friends circle using the attached friendship screensaver..
check the attached screensaver
and if u like it send it to all those you consider
to be true friends... if it comes back to you then
you will know that you have a circle of friends..

(Mail text 3)
check the attached screensaver
and enjoy the world of friendship..
are u in a rocking mood...
check the attached scrennsaver and start shaking..

(Mail text 4)
Check the attached screensaver..

(Mail text 5)
Are you lonely ??..
check the attached screensaver and
forget the pain of loneliness

(Mail text 6)
Looking for online pals..
check the attached friend finder software..

(Mail text 7)
sending you a screensaver..
check it and let me know how it is...

(Mail text 8)
Check the attached screensaver
and feel the fragrance of true love...

(Mail text 9)
I just got this wonderfull screensaver from
Just check it out and let me know how it is..
I just came across it.. check out..
Are you one of those unfortunate human beings who are desperately
looking for friends.. but still not getting true friends with whom
you can share your everything..

anyway you wont feel down any more cause GC Chat Network has brought
up a global chat and online match making system using its own GC
Messenger. Attached is the fully functional free version of GC
Instant Messenger and Match Making client..
Just install, register an account with us and find thousands of online
pals all over the world..
You can also search for friends by specific country,city,region etc.

Regards Admin,
GC Global Chat Network System..

(Mail text 10)
So you think you are in love..
is it true love ? you may think right now that you are in
true love but it is certainly possible that it is nothing
but a mere infatuation to you..

anyway to know yourself better than you have ever known check
the attached screensaver and feel the fragrance of true love..

(Mail text 11)
Hey pal,
you know friendship is like a business...
to get something you need to give something..
though its not that harsh as business but to
get love and care from your friends you need to give
love,care and respect to your friends.. right {BR>
check the attached screensaver and you will learn how to
make your friends happy..

(Mail text 12)
Its quite obvious that in our life we have numerous friends
but.. BUT Best Friend can only be ONE.. right {BR>so can you decide who is your best friend {BR>i guess not.. cause mostly you will find that your best friend
wont care about u like somebody else..

anyway i found one way to find who is my best friend..
check it..
just check the attached screensaver.. answer some questions
in it and also ask your best friend to answer the questions..

..then you will know more about him..

(Mail text 13)
Hey pal,
wanna have some fun in life... {BR>feel like life is too boring and monotonous..
check the attached screensaver and bring colours
to your black & white life.. :)

(Mail text 14)
I just came across this funny screensaver..
sending it to u.. hope u like it..
check out and die laughing.. :)

(Mail text 15)

This E-Mail is never sent unsolicited. If you receive this
E-Mail then it is because you have subscribed to the official
newsletter at the KOF ONLINE website.

King Of Fighters is one of the greatest action game ever made.
Now after the mind boggling sucess of KOF 2001 SNK proudly
presents to you KOF 2002 with 4 new charecters.
Even though we need no publicity for our product but this
time we have decided to give away a fully functional trial
version of KOF 2002. So check out the attached trial version
of KOF 2002 and register at our official website to get a free
copy of KOF2002 original version

Best Regards,


(Mail text 16)
I just came across your email ID while searching in the Yahoo profiles.
Actually I want a true friend 4 life with whom I can share my everything.
So if you are interested in being my friend 4 life then mail me.

If you wanna know about me, attached is my profile along with some of my
pics. You can check and if you like it then do mail me.
I will be waiting for your mail.

Best Wishes,
Your Friend..

(Mail text 17)
Looking for some Hardcore mind boggling action ?
Install the attached browser software and browse
across millions of paid hardcore sex sites for free.
Using the software you can safely and easily browse
across most of the hardcore XXX paid sites across the
internet for free. Using it you can also clean all
traces of your web browsing from your computer.

Note:The attached browser software is made exclusivley
for demo only. You can use the software for a limited
time of 35 days after which you have to register it
at our official website for its furthur use.


(Mail text 18)
Klez.H is the most common world-wide spreading worm.It's very dangerous by corrupting your files. Because of its very smart stealth and anti-anti-virus technic,most common AV software can't detect or clean it. We developed this free immunity tool to defeat the malicious virus. You only need to run this tool once,and then Klez will never come into your PC

(Mail text 19)
The attached product is send as a part of our official campaign
for the popularity of our product.
You have been chosen to try a free fully functional sample of our
product.If you are satified then you can send it to your friends.
All you have to do is to install the software and register an account
with us using the links provided in the software. Then send this software
to your friends using your account ID and for each person who registers
with us through your account, we will pay you $1.5.Once your account reaches
the limit of $50, your payment will be send to your registration address by
check or draft.
Please note that the registration process is completely free which means
by participating in this program you will only gain without loosing anything.

Best Regards,

*File attachment (File attachment is selected from the following.)

- The_Best.scr
- Codeproject.scr
- SQL_4_Free.scr
- I_Love_You.scr
- Stone.scr
- Sex.scrSoccer.scr
- Real.scr
- Plus6.scr
- Plus2.scr
- Playboy.scr
- Hardcore4Free.scr
- xxx4Free.scr
- Screensavers.scr
- Peace.scr
- Body_Building.scr
- Services.scr
- VXer_The_LoveStory.scr
- Hacker_The_LoveStory.scr
- World_Tour.scr
- up_life.scr
- Sweetheart.scr
- Sexy_Jenna.scr
- Jenna_Jemson.scr
- zDenka.scr
- Ravs.scr
- Free_Love_Screensavers.scr
- Romeo_Juliet.scr
- Hacker.scr
- KOF_Fighting.exe
- KOF_Sample.exe
- KOF_Demo.exe
- KOF_The_Game.exe
- KOF2002.exe
- King_of_Figthers.exe
- KOF.exe
- My_Sexy_Pic.scr
- MyProfile.scr
- Ways_To_Earn_Money.exe
- Beautifull.scr
- Valentines_Day.scr
- Britney_Sample.scr
- FreakOut.exe
- MyPic.scr
- Notes.exe
- Cupid.scr
- Romantic.scr
- Project.exe
- Love.scr
- friendship_funny.scr
- Colour_of_life.scr
- Life.scr
- Best_friend.scr
- Friend_happy.scr
- True_love.scr
- Gc_messenger_exe
- Dance.scr
- I_like_you.scr
- Friend_finder_exe
- Be_happy.scr
- Sweet.scr
- Shake.scr
- World_of_friendship.scr
- Friendship.scr
- Funny.scr
- Hotmail_hack_exe.scr

Infection symptoms

1. Upon execution, the worm displays a fake error message box:

Title : Initialisation Error
Message : Required file Riched32.dll not found. Application initialisation error  

2. The worm places itself as the following files to the Windows system folder.

- WinServices.exe.
- Nav32_loader.exe
- Tcpsvs32.exe

3. The worm creates one of files below.

- Hotmail_hack.exe
- Friendship.scr
- World_of_friendship.scr
- Shake.scr
- Sweet.scr
- Be_happy.scr
- Friend_finder.exe
- I_like_you.scr
- Love.scr
- Dance.scr
- Gc_messenger.exe
- True_love.scr
- Friend_happy.scr
- Best_friend.scr
- Life.scr
- Colour_of_life.scr
- Friendship_funny.scr
- Funny.scr

4. The worm registers itself in the following registry so as to auto-execute itself in every boot-up.

- HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun

Name: WinServices
Data: (Windows system folder)WinServices.exe


- HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunServices

Name: WinServices
Data: (Windows system folder)WinServices.exe

5. The worm modifies the following registry so as to execute itself automatically whenever any program is executed.

- HKEY_LOCAL_MACHINESoftwareClassesexefileshellopencommand

Name : Default
Data: (Windows system folder)Nav32_loader.exe"%1 %*

6. If the system date is March 25 or May 22, the worm displays the following message box and switches function of mouse button.

Title : You are my Best Friend
Message : Happy Birthday Dear

7. Every Thursday, the worm randomly changes the main page of Internet Explorer to one of the following websites.

- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /
- http:/ /

8. The worm terminates the following processes (majority are processes of security program).

- F-PROT95
- TDS2-98
- SCAN32
- F-AGNT95
- VET95
- NOD32
- _AVP32
- NVC95
- NAVW32
- AVP32

9. The infected system attempts to access the following site, causing network traffic to the site. This is a form of DoS (Denial of Service) attack.


Removal Instructions
How to repair

Download ViRobot definitions file of March 27, 2003 to detect/repair (removal of worm file/modification of registry).

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