W32.Yaha.K@mm

Symantec Security Response - W32.Yaha.K@mm

I'm confused by the nomenclature, but I think this may be the same worm that Paul posted about (Lentin/Yaha.M):

W32.Yaha.K@mm is a variant of W32.Yaha.J@mm. It terminates some antivirus and firewall processes. The worm uses its own SMTP engine to email itself to all contacts in the Windows Address Book, the MSN Messenger, the .NET Messenger, the Yahoo Pager, and all files whose extension contains the letter HT. The email message has randomly chosen subject line, message, and attachment name.

This threat is written in the Microsoft C++ language and is compressed with UPX. The uncompressed size is about 75 KB.

Also Known As: W32/Yaha.k [McAfee], I-Worm.Lentin.i [KAV], Win32/Yaha.K@mm [GeCAD], W32/Yaha-K [Sophos], Win32.Yaha.K [CA]
Type: Worm
Infection Length: 34,304 bytes
Systems Affected: Windows 95, Windows 98, Windows NT, Windows 2000, Windows XP, Windows Me
Systems Not Affected: Macintosh, OS/2, UNIX, Linux

technical details

When W32.Yaha.K@mm runs, it does the following,

It copies itself as the following files and sets the attribute of the files to hidden.

• C:\%System%\WinServices.exe.
• C:\%System%\nav32_loader.exe
• C:\%System%\tcpsvs32.exe

NOTE: %System% is a variable. The Trojan locates the Windows system folder and copies itself to that location. By default this is C:\Windows\System (Windows 95/98/Millenium), C:\Winnt\System32 (Windows 2000/NT/), or C:\Windows\System32 (Windows XP).

It adds a value

WinServices.exe C:\%System%\WinServices.exe

to the registry keys

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices

so that the worm runs when you start Windows.

The worm configures itself to run each time that an .exe file; it does so by changing the default value of the registry key

HKEY_LOCAL_MACHINE\Software\Classes\exefile\shell\open
ommand

to

C:\%System%\WinServices.exe"%1 %*

It may also copy itself to the Windows system folder as one of the following,

• 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

It attempts to terminate antivirus and firewall processes. It inventories the active processes, and if the name of the process contains one of the following, it attempts to terminate the process:

• REGEDIT
• ACKWIN32
• F-AGNT95
• SWEEP95
• VET95
• N32SCANW
• _AVPM
• LOCKDOWNADVANCED
• NSPLUGIN
• NSCHEDNT
• NRESQ32
• NPSSVC
• NOD32
• _AVPCC
• _AVP32
• NORTON
• NVC95
• FP-WIN
• IOMON98
• PCCWIN98
• F-PROT95
• F-STOPW
• PVIEW95
• NAVWNT
• NAVRUNR
• NAVLU32
• NAVAPSVC
• NISUM
• SYMPROXYSVC
• RESCUE32
• NISSERV
• VSECOMR
• VETTRAY
• TDS2-NT
• TDS2-98
• SCAN32
• PCFWALLICON
• NSCHED32
• IAMSERV.EXE
• FRW.EXE
• MCAFEE
• ATRACK
• IAMAPP
• LUCOMSERVER
• LUALL
• NMAIN
• NAVW32
• NAVAPW32
• VSSTAT
• VSHWIN32
• AVSYNMGR
• AVCONSOL
• WEBTRAP
• POP3TRAP
• PCCMAIN
• PCCIOMON
• ESAFE.EXE
• AVPM.EXE
• AVPCC.EXE
• AMON.EXE
• ALERTSVC
• ZONEALARM
• AVP32
• LOCKDOWN2000
• AVP.EXE
• CFINET32
• CFINET
• ICMON
• RMVTRJANSAFEWEB
• WEBSCANX
• PVIEW
• ANTIVIR

Email routine details

The worm uses its own SMTP engine to email itself to all contacts in the Windows Address Book, the MSN Messenger, the .NET Messenger, the Yahoo Pager, and all files whose extension contains the letter HT. It attempts to use the infected computer's default SMTP server to send mail. If it cannot find that information, then it uses one of many SMTP server addresses that are hrdcoded into the worm. The email message has the following characteristics:

Subject: Subject line is one of the following,

• 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 ****
• Hello
• Hi

Message: Message can be one of the following,

• hey,
  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.
  
• hi,
  check the attached love screensaver
  and feel the fragrance of true love..
  
• Hi,
  check the attached screensaver..
  its really wonderfool..
  i got it from freescreensavers.com
  
• Hi,
  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..
  
• Hi,
  check the attached screensaver
  and enjoy the world of friendship..
  
• Hi,
  are u in a rocking mood...
  check the attached scrennsaver and start shaking..
  
• Hi,
  Check the attached screensaver..
  
• Hi,
  Are you lonely ??..
  check the attached screensaver and
  forget the pain of loneliness
  
• Hi,
  Looking for online pals..
  check the attached friend finder software..
  
• Hi,
  sending you a screensaver..
  check it and let me know how it is...
  
• Hi,
  Check the attached screensaver
  and feel the fragrance of true love...
  
• Hey,
  I just got this wonderfull screensaver from freescreensaver.com..
  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..
  
• Hi,
  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..
  
• 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..
  
• Hi,
  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..
  
• 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..
  
• Hi,
  I just came across this funny screensaver..
  sending it to u.. hope u like it..
  check out and die laughing..
  
• <<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>>
  
  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,
  Admin,KOF ONLINE..
  
  <<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>>
  
• Hello,
  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..
  
• Hello,
  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.
  
  Regards,
  Admin.
  
• 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
  
• Hello,
  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,
  Admin,
  
  Attachment: Attachment is one of 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
• zXXX_BROWSER.exe
• Britney_Sample.scr
• THEROCK.scr
• FreakOut.exe
• MyPic.scr
• Notes.exe
• Cupid.scr
• FixElkern.com
• FixKlez.com
• 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

From: The From field is a fake email address that is constructed from the following,

• Klein Anderson
• Codeproject
• SQL Library
• me2K
• Rocking Stone
• Super Soccer
• Sexy Screensavers
• Real Inc.
• Plus 6
• Plus 2
• Playboy Inc.
• Hardcore Screensavers
• XXX Screensavers
• Nomadic Screensavers
• Keanu Stevenson
• Nicolas Schwarzeneggar
• admin@hackersclub.com
• admin@viruswriters.com
• admin@hackers.com
• Paul Owen
• Benting
• Veronica Anderson
• Club Jenna
• Jenna Jameson
• Zdenka Podkapova
• Raveena Pusanova
• Screensavers of Love
• Romeo & Juliet
• Jaucques Antonio Barkinstein
• Cathy Kindergarten
• KOF Online
• Omega Rugal
• Terry Bogard
• Iori Yagami
• Kyo Kusanagi
• Clark Steel
• Ralph Jones
• Jasmine Stevens
• Ross Anderson
• John Vandervochich
• American Beauty
• Valentine Screensavers
• Lovers Screensavers
• zporNstarS
• britneyspears.org
• The Rock
• Noopman
• Susan
• Jonathan
• Cupid
• McAfee Inc.
• Norton Antivirus
• Trend Micro
• Romantic Screensavers
• Jericho
• Love Inc.

and

• kl@aminoprojects.com
• admin@codeproject.com
• free@sql.library.com
• me@me2K.com
• stone@esterplaza.com
• marketing@suppersoccer.com
• free@sexyscreensavers.com
• sales@real.com
• plus@real.com
• sales@playboy.com
• free@hardcorescreensavers.com
• free@xxxscreensavers.com
• kkn@k2k.comscreensavers@nomadic.com
• nics@nomadic.com
• paul@kqscore.com
• btq@263.com
• services@tcsonline.com
• admin@clubjenna.com
• jenna@jennajameson.com
• zdenka@zpornstars.com
• ravs@go2pussy.com
• love@lovescreensavers.com
• DNA_seraph@163.com
• super@21cn.com
• cathy@21cn.com
• admin@kofonline.com
• zhouyuye@citiz.net
• lubing@7135.com
• hamada@seikosangyo.com
• luoairong@21cn.com
• valentinescreensavers@t2k.com
• screensavers@lovers.com
• admin@zpornstars.com
• newsletters@britneyspears.org
• therock@wwe.com
• ericpan@online.com.pk
• samsun@online.sh.cn
• yjworks@online.sh.cn
• cupid@freescreensavers.com
• av_patch@mcafee.com
• av_patch@norton.com
• av_patch@trendmicro.com
• romanticscreensavers@love.com
• caijob@online.sh.cn
• loverscreensavers@love.com

If the current system date is March 25 or May 22, the worm displays the following message, and switch the functions of mouse's left button and right button.

http://home.mindspring.com/~randybell2/YahaK.gif

If the current system day is Thursday, the worm randomly changes the value date of value name Start Page in the registry key

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

to one of the following,

• http:/ /www.unixhideout.com
• http:/ /www.hirosh.tk
• http:/ /www.neworder.box.sk
• http:/ /www.blacksun.box.sk
• http:/ /www.coderz.net
• http:/ /www.hackers.com/html/neohaven.html
• http:/ /www.ankitfadia.com
• http:/ /www.hrvg.tk
• http:/ /www.hackersclub.up.to
• http:/ /geocities.com/snak33y3s

If the current system day is Thursday, the worm retrieves current user's Personal folder from the following registry key and delete the folder.

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders

For example, the default Personal folder is "C:\My Documents" under Windows 98 system.

If the current system day is Thursday, the worm creates a text file aYeHS.txt into current user's desktop. The attribute of the file is set to hidden archive. The file is 465 bytes in length and contains the following strings,

============================================================
r0xx pReSaNt$ W32.@YerH$.B (all r1ght$ re$erv3d.. )
w3 aRe tHe gRe@t 1nD1aN$..
------------------------------------------------------

m@iN mIssIoN iS t0 sPreAd tHe nAmE @YerH$
s00 mUch t0 c0me..
iNclUdEd DDoS c0mp0neNtS c@usE oF **** p@kI l@meRs

eXp3ct th3 uNeXp3ctEd

dEdic@t3d t0 : mY b3$t fRi3nD
============================================================

>> qph@hackermail.com

removal instructions

NOTE: If the worm has not run, and your Symantec antivirus product detects W32.Yaha.K@mm either in an email message or when the worm attempts to run, simply delete it.

If the worm has run, you must do the following:

• 
  1. Download updated virus definitions using the Intelligent Updater, but do not install them.
  2. Restart the computer in Safe mode.
  3. Copy the file Regedit.exe to Regedit.com.
  1. Edit the registry and reverse the changes that the worm made.
  2. Restart the computer to normal mode.
  3. Start your Symantec antivirus software. If it does not start or function properly, reinstall it.
  4. Install the Intelligent Updater virus definitions that you downloaded earlier.
  5. Run a full system scan, and delete files that are detected as W32.Yaha.K@mm.

1. Proceed to the next section, "To edit the registry and reverse the changes that the worm made" only after you have accomplished the previous steps.

4. To edit the registry and reverse the changes that the worm made:

CAUTION: Symantec strongly recommends that you back up the registry before you make any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify only the keys that are specified. Read the document How to make a backup of the Windows registry for instructions.

• 
  1. Navigate to and select the following key:
  
  HKEY_LOCAL_MACHINE\Software\Classes\exefile\shell\open
  ommand
  
  CAUTION: The HKEY_LOCAL_MACHINE\Software\Classes key contains many subkey entries that refer to other file extensions. One of these file extensions is .exe. Changing this extension can prevent any files ending with an .exe extension from running. Make sure that you browse all the way along this path until you reach the
  ommand subkey.
  
  Modify the: [HKEY_LOCAL_MACHINE, Software, Classes, exefile, shell, open, command] subkey that is shown in the following figure:
  
  http://home.mindspring.com/~randybell2/Yaha.J_2.gif<<=== NOTE: Modify this key.
  
  2. In the right pane, double-click the (Default) value.
  3. Delete the current value data, and then type: "%1" %* (That is, type the following characters: quote-percent-one-quote-space-percent-asterisk.)
  
  NOTES:
  • On Windows 95/98/Millenium and Windows NT systems, the Registry Editor automatically encloses the value within quotation marks. When you click OK, the (Default) value should look exactly like this:
    
    ""%1" %*"
    
  • On Windows 2000/XP systems, the additional quotation marks will not appear. When you click OK, the (Default) value should look exactly like this:
    
    "%1" %*
    
  • Make sure that you completely delete all value data in the command key before you type the correct data. If you leave a space at the beginning of the entry, any attempt to run program files will result in the error message, "Windows cannot find .exe." If this happens to you, start over at the beginning of this document, and make sure that you completely remove the current value data.
  4. Navigate in turn to each of the following keys:
  
  HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
  HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
  CurrentVersion\RunServices
  
  NOTE: The RunServices key may not exist on all systems.
  
  5. In the right pane, delete the value
  
  WinServices.exe C:\%System%\WinServices.exe
  
  6. Restart the computer

 

This removal tool has proven it´s use in a few cases:

DIRECT DOWNLOAD LINK
http://www.bitdefender.com/download/AntiYahaa.exe

I hope nobody needs it, but todays outbreak makes me fear otherwise.

Regards,

Pieter

 

Hi, im trying to follow the instructions but i think because of the Yaha virus my system will not allow me to do run regedit could you please help??

 

Hi maj,

If the removal tool won´t work try renaming it to .com and then run it again.
And Technodrome posted a link for another removal tool here: http://www.wilderssecurity.com/showthread.php?t=5915

Good luck and let us know,

Pieter

 

Don't delete the yaha.K worm files manually. If you delete the files manually, your *.EXE files will not work. I have accidently deleted and thought everything gone. After a lot of search found a tool in Solo Antivirus site. Visit http://www.srnmicro.com/virusinfo/yaha_k.htm for a free download. It worked great for me!! My pc is better now

 

DrWeb: Win32.HLLM.Yaha.1

DialogueScience Virus Library - Win32.HLLM.Yaha.1

Added to Dr.Web virus base
December 25, 2002 ?., 09:54 MSK - hot add-on to version 4.29
Aliases:
Win32/Yaha.K@mm, W32/Yaha.k, I-Worm.Lentin.i, W32/Yaha-K, Win32.Yaha.K, W32/Yaha.M-mm
Virus type:
mass-mailing worm
Affected platforms:
Windows 95/98/MilleniumNT/2000/XP

Infection signs:

• presence of files nav32_loader.exe, tcpsvs32.exe and WinServices.exe in the Windows %System% directory
• presence of the following entries in the system registry:
  • HKLM\Software\Microsoft\Windows\CurrentVersion\Run\WinServices\
    WinServices = “%System%\WinServices.exe”
  • HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
    WinServices = “%System%\WinServices.exe”
  • HKEY_CLASSES_ROOT\exefile\shell\open\command "(Default)"
    “%System%\nav32_loader.exe””%1”%*
• spontaneous termination of some anti-virus/security software and firewalls;
• Message Happy Birthday Dear displayed on March 25 and on May 22;
• spontaneous change of attributes of all files in My Documents folder to "hidden"
• presence of a text file named aYerHS.txt with attribute "hidden" to Active Desktop

Virus description:
Win32.HLLM.Yaha.1 is a mass-mailing worm written in Visual ?++ programming language. It affects computers under Windows 95/98/Millenium/NT/2000/XP operating systems. The worm is UPX-packed, its size when packed is 34,304 bytes. All viruses of Yaha family are supposed to be created in India.
The worm propagates via e-mail using its own built-in SMTP engine. It retrieves the SMTP server data of the infected machine in the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts (the worm looks through several variants of the user’s accounts available on the infected computer).
It finds the addresses for its dissemination in Windows Address Book (WAB), Yahoo Messenger and from files with extensions containing "ht" symbols.

The message sent by the worm looks as follows:

Sender: contains a false address to conceal the real sender and can be one of the following:

• 
  
  kl@aminoprojects.com
  admin@codeproject.com
  free@sql.library.com
  me@me2K.com
  stone@esterplaza.com
  marketing@suppersoccer.com
  free@sexyscreensavers.com
  sales@real.com
  plus@real.com
  sales@playboy.com
  free@hardcorescreensavers.com
  free@xxxscreensavers.com
  kkn@k2k.com
  screensavers@nomadic.com
  nics@nomadic.com
  paul@kqscore.com
  btq@263.com
  services@tcsonline.com
  admin@clubjenna.com
  jenna@jennajameson.com
  zdenka@zpornstars.com
  ravs@go2pussy.com
  love@lovescreensavers.com
  DNA_seraph@163.com
  super@21cn.com
  cathy@21cn.com
  admin@kofonline.com
  zhouyuye@citiz.net
  lubing@7135.com
  hamada@seikosangyo.com
  luoairong@21cn.com
  valentinescreensavers@t2k.com
  screensavers@lovers.com
  admin@zpornstars.com
  newsletters@britneyspears.org
  therock@wwe.com
  ericpan@online.com.pk
  samsun@online.sh.cn
  yjworks@online.sh.cn
  cupid@freescreensavers.com
  av_patch@mcafee.com
  av_patch@norton.com
  av_patch@trendmicro.com
  romanticscreensavers@love.com
  caijob@online.sh.cn
  loverscreensavers@love.com

The Subject is chosen by the worm from a long list within the worm’s body:

• 
  
  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

Message body: the worm contains several variants of the text forming the body of the infected message.
The attachment is chosen from the following list and always has a src. or .exe extension (extensions of executable files in Windows):

• 
  
  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
  zXXX_BROWSER.exe
  Britney_Sample.scr
  THEROCK.scr
  FreakOut.exe
  MyPic.scr
  Notes.exe
  Cupid.scr
  FixElkern.com
  FixKlez.com
  Romantic.scr
  Project.exe Love.scr

System infection:
When activated the worm copies itself to the Windows/System folder (in Windows 9x and Windows ME it is usually C:\Windows\System, in Windows NT/2000 - C:\WINNT\System32, in Windows XP -C:\Windows\System32) in the form of three files:

• 
  
  nav32_loader.exe
  tcpsvs32.exe
  WinServices.exe

To secure its automatic execution at every Windows start-up the worm introduces changes to the following registry entries:

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\WinServices\
  WinServices = “%System%\WinServices.exe”
• HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
  WinServices = “%System%\WinServices.exe”

To get activated when any executable file is run the worm adds the value “%System%\nav32_loader.exe””%1”%* To the registry entry

HKEY_CLASSES_ROOT\exefile\shell\open\command "(Default)"

Under Windows NT/2000 the worm copies itself as one of the following files:

• 
  
  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

Having hit the system the worm performs the following actions:

• Tries to terminate the follwoing anti-virus programs, firewalls or other security related software:
  • 
    
    REGEDIT
    ACKWIN32
    F-AGNT95
    SWEEP95
    VET95
    N32SCANW
    _AVPM
    LOCKDOWNADVANCED
    NSPLUGIN
    NSCHEDNT
    NRESQ32
    NPSSVC
    NOD32
    _AVPCC
    _AVP32
    NORTON
    NVC95
    FP-WIN
    IOMON98
    PCCWIN98
    F-PROT95
    F-STOPW
    PVIEW95
    NAVWNT
    NAVRUNR
    NAVLU32
    NAVAPSVC
    NISUM
    SYMPROXYSVC
    RESCUE32
    NISSERV
    VSECOMR
    VETTRAY
    TDS2-NT
    TDS2-98
    SCAN32
    PCFWALLICON
    NSCHED32
    IAMSERV.EXE
    FRW.EXE
    MCAFEE
    ATRACK
    IAMAPP
    LUCOMSERVER
    LUALL
    NMAIN
    NAVW32
    NAVAPW32
    VSSTAT
    VSHWIN32
    AVSYNMGR
    AVCONSOL
    WEBTRAP
    POP3TRAP
    PCCMAIN
    PCCIOMON
    ESAFE.EXE
    AVPM.EXE
    AVPCC.EXE
    AMON.EXE
    ALERTSVC
    ZONEALARM
    AVP32
    LOCKDOWN2000
    AVP.EXE
    CFINET32
    CFINET
    ICMON
    RMVTRJANSAFEWEB
    WEBSCANX
    PVIEW
    ANTIVIR
• On March 25 or May 22 it displays a message on the screen:
  • 
    Title You are my Best Friend
    Message: Happy Birthday Dear
  After "OK" button is pressed it swaps the mouse button functions.
• It makes attempts to initiate a DoS-attack on a server located in Pakistan
• It modifies the registry entry
  
  Page Software\Microsoft\Internet Explorer\Main
  
  thus changing the Internet Explorer start page for one of the following:
  http://www.unixhideout.com
  http://www.hirosh.tk
  http://www.neworder.box.sk
  http://www.blacksun.box.sk
  http://www.coderz.net
  http://www.hackers.com/html/neohaven.html
  http://www.ankitfadia.com
  http://www.hrvg.tk
  http://www.hackersclub.up.to
  http://geocities.com/snak33y3s
  
• On Thursdays it changes the attributes of all files in My Documents folder for "hidden".
• On Thursday it drops a text file named aYerHS.txt with the attribute "hidden" to Active Desktop.

The present modification of the Yaha family worm slightly differs from other family representatives. But it deserves certain attention due to its rapid spreading in Internet. According to the Virus Alert Service of DialogueScience, Inc. the worm has been considerably present in the mail traffic since its appearance.

Dr.Web® anti-virus program detects and successfully disinfects Win32.HLLM.Yaha.1. Should you have the resident SpIDer Guard enabled a mail message infected with the worm is of no danger to you. The users with SpIDer Mail installed can also feel absolutely protected. However, if the virus had hit your computer and infected it you should run Dr.Web® anti-virus scanner to cure the machine. The scanner will remove from the memory the process activated by the worm and restore the system registry.

 

RAV AntiVirus: Win32/Yaha.K@mm

RAV AntiVirus - Win32/Yaha.K@mm

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