W32/Yaha-K

Aliases	Yaha-M
Category	Viruses and Spyware
Type	Worm
What to do	Please contact support for assistance with removal.
Prevalence	low high

Summary

Summary
Action
More Information


Affected operating systems	Windows
Included in our products from	February 2003 (3.66)
Detected by	All Sophos products

Action

Summary
Action
More Information

Please read the instructions for removing W32/Yaha-K.

More Information

Summary
Action
More Information

W32/Yaha-K creates three files in your system folder: WinServices.exe, nav32_loader.exe and tcpsvc32.exe. All these are exact copies of the worm.

A further copy of the worm may also appear in the system folder with one of the following filenames:

Be_Happy.scr Best_Friend.scr colour_of_life.scr dance.scr Friend_Finder.exe Friend_Happy.scr friendship.scr friendship_funny.scr funny.scr GC_Messenger.exe hotmail_hack.exe I_Like_You.scr life.scr love.scr shake.scr Sweet.scr True_Love.scr world_of_friendship.scr

W32/Yaha-K arrives in an email that can have one of many different subject lines, message texts and attachment names. Additionally the address that the email appears to originate from may be fake.

The subject line of the email is randomly chosen from the following list:

Are you a Soccer Fan ? Are you beautiful Are you in Love Are you looking for Love Are you the BEST Check it out Check this shit Check ur friends Circle Demo KOF 2002 Feel the fragrance of Love Find a good friend Freak Out Free Demo Game Free rAVs Screensavers Free Screenavers of Love Free Screensavers Free Screensavers 4 U Free Win32 API source Free XXX Hardcore Screensavers 4 U Hello hey check it yaar Hi How sweet this Screen saver I am in Love I Love You I Love You.. Jenna 4 U Learn How To Love Learn SQL 4 Free Let',27h,'s Dance and forget pains Looking for Friendship love speaks from the heart Lovers Corner make ur friend happy Need a friend? Need money ?? One Hacker',27h,'s Love One Virus Writer',27h,'s Story Patch for Elkern.gen Patch for Klez.H Play KOF 2002 4 Free Project Sample KOF 2002 Sample Playboy Sample Screensavers Say ',27h,'I Like You',27h,' To ur friend Screensavers from Club Jenna Sexy Screensavers 4 U Shake it baby The Hotmail Hack The King of KOF The world of Friendship Things to note to ur friends to ur lovers True Love U realy Want this Visit us Wanna be a HE-MAN Wanna be friends ? Wanna be friends ?? Wanna be like a stone ? Wanna be my sweetheart ?? Wanna Brawl ?? Wanna Hack ?? Wanna Rumble ?? war Againest Loneliness We want peace Whats up Who is ur Best Friend Who is your Valentine World Tour Wowwwwwwwwwww check it WWE Screensavers XXX Screensavers 4 U You are so sweet

The message text is randomly chosen from the following texts:

"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.."

"Hi,
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

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
so can you decide who is your best friend
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...
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 trialversion
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 youwanna 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 freewhich means
by participating in this program you will only gain without loosing anything.

Best Regards,
Admin,"

The attachment containing the worm can have any of the following filenames:

Be_Happy.scr Beautifull.scr Best_Friend.scr Body_Building.scr Britney_Sample.scr Codeproject.scr colour_of_life.scr Cupid.scr dance.scr FixElkern.com FixKlez.com FreakOut.exe Free_Love_Screensavers.scr Friend_Finder.exe Friend_Happy.scr friendship.scr friendship_funny.scr funny.scr GC_Messenger.exe Hacker.scr Hacker_The_LoveStory.scr Hardcore4Free.scr hotmail_hack.exe I_Like_You.scr I_Love_You.scr Jenna_Jemson.scr King_of_Figthers.exe KOF.exe KOF_Demo.exe KOF_Fighting.exe KOF_Sample.exe KOF_The_Game.exe KOF2002.exe life.scr Love.scr love.scr My_Sexy_Pic.scr MyPic.scr MyProfile.scr Notes.exe Peace.scr Playboy.scr Plus2.scr Plus6.scr Project.exe Ravs.scr Real.scr Romantic.scr Romeo_Juliet.scr Screensavers.scr Services.scr Sex.scrSoccer.scr Sexy_Jenna.scr shake.scr Stone.scr Sweet.scr Sweetheart.scr The_Best.scr THEROCK.scr True_Love.scr up_life.scr Valentines_Day.scr VXer_The_LoveStory.scr Ways_To_Earn_Money.exe world_of_friendship.scr World_Tour.scr xxx4Free.scr zDenka.scr zXXX_BROWSER.exe

The email may contain a FROM field constructed from the following two lists. The name is taken from the first list and the email address is taken from the corresponding position in the second list:

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

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

It is not necessary for a user to double-click on the attachment to become infected as this worm can exploit a security vulnerability in Microsoft Internet Explorer, Outlook and Outlook Express. To prevent reinfection, users of Microsoft Outlook and Outlook Express should install the following patch available from Microsoft:
http://www.microsoft.com/technet/security/bulletin/MS01-027.asp
(This patch fixes a number of vulnerabilities in Microsoft's software, including the one exploited by this worm.)

On the 25th of March and the 22nd of May this virus will display a message box containing the text "Happy Birthday Dear". Also the operation of the mouse buttons will be swapped.

On a Thursday W32/Yaha-K will perform the following three actions:

set the hidden attribute on all files and folders in the Personal Shell Folder, usually My Documents

create a text file named aYerHS.txt on the Desktop containing one of the following five messages:

"==================================================
W32.@YerH$.B,Made in India,
wE aRe thE greAt iNdIaNs..
----------------------------
spEciAl 10x to c0bra..
f0r inSpirAtIon + c0dIng hElp..
=================================================="

"=================================================
W32.@YerH$.B,Made in India
wE aRe thE greAt iNdIaNs..
----------------------------
wAnT peAce aNd pr0speRity in InDiA ?..
f**k tHe c0rruptEd p0litiCian$..no shit$ nEEdeD..
mErA bhAraT mAhaN ??.. n0t yeT..wE nEEd t0 mAkE iT..
talenT & hArd w0rK shOulD be rEspEctEd..
sElf stYleD a**H***$ mUsT bE eLimInatEd....
n0 m0re $hiT m0n0p0lY..
================================================="

"=================================================
W32.@YerH$.B,Made in India.
wE aRe thE greAt iNdiAnS.
----------------------------
iNdiAn hAckeRs + vXerS teAm up...
aNd kicK lamEr a**
no m0re pAk shIT..
itZ oUr tiMe to shOw tHem, the p0wer of teaM w0rk.
f**k AIC,GFORCE,SILVERLORDS,WFD..f*****g k1dd1es..
no sHit bUsineSS iN heRe aNd
nO lamE stuFF..
================================================="

"==================================================
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 sHiT p@kI l@meRs
eXp3ct th3 uNeXp3ctEd
dEdic@t3d t0 : mY b3$t fRi3nD
=================================================="

change the default Internet Explorer start up page via the registry entry HKLM\Software\Microsoft\Internet Explorer\Main to one of the following web sites: www.hrvg.tk, www.hackersclub.up.to, geocities.com/snak33ys, www.unixhideout.com, www.hirosh.tk, www.neworder.box.sk, www.blacksun.box.sk, www.coderz.net, www.hackers.com/html/neohaven.html, www.ankitfadia.com.

Finally W32/Yaha-K will execute a denial of service attack against a Pakistani government website, infopak.gov.pk. W32/Yaha-K creates three files in your system folder: WinServices.exe, nav32_loader.exe and tcpsvc32.exe. All these are exact copies of the worm.

W32/Yaha-K adds the following values to your registry, setting them to run the WinServices.exe file whenever you boot up or log on to the network:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\Winservices
="%SYSFOLDER%\WinServices.exe"

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\Winservices
="%SYSFOLDER%\WinServices.exe"

W32/Yaha-K also sets

HKCR\exefile\shell\open\command\(Default)
=""%SYSFOLDER%\nav32_loader.exe" "%1" %*"

This means that W32/Yaha-K is executed whenever you launch an EXE (program file).

A further copy of the worm may also appear in the system folder with one of the following filenames:
Be_Happy.scr Best_Friend.scr colour_of_life.scr dance.scr Friend_Finder.exe Friend_Happy.scr friendship.scr friendship_funny.scr funny.scr GC_Messenger.exe hotmail_hack.exe I_Like_You.scr life.scr love.scr shake.scr Sweet.scr True_Love.scr world_of_friendship.scr

Once executed, W32/Yaha-K stays resident in memory as a process which is not visible in the task list. The worm takes active measures against anti-virus software, including:

automatically resetting its "exefile" association if you edit the registry

actively terminating a range of anti-virus, firewall and internet service programs by matching process names against the following list:

_AVP32, _AVPCC, _avpm, ACKWIN32, ALERTSVC, AMON.EXE, ANTIVIR, ATRACK, AVCONSOL, AVP.EXE, AVPCC.EXE, AVPM.EXE, AVSYNMGR, CFINET, CFINET32, ESAFE.EXE, F-AGNT95, F-PROT95, FP-WIN, FRW.EXE, F-STOPW, IAMAPP, IAMSERV.EXE, IOMON98, LOCKDOWN2000, LOCKDOWNADVANCED, LUCOMSERVER, MCAFEE, N32SCANW, NAVAPSVC, NAVAPW32, NAVLU32, NAVRUNR, NAVW32, NAVWNT, NISSERV, NORTON, NPSSVC, NRESQ32, NSCHED32, NSCHEDNT, NSPLUGIN, PCCIOMON, PCCMAIN, PCCWIN98, PCFWALLICON, POP3TRAP, PVIEW, PVIEW95, REGEDIT, RESCUE32, RMVTRJANSAFEWEB, SCAN32, SWEEP95, SYMPROXYSVC, TDS2-98, TDS2-NT, Vet95, VETTRAY, VSECOMR, VSHWIN32, VSSTAT, WEBSCANX, WEBTRAP, ZONEALARM

W32/Yaha-K arrives in an email that can have one of many different subject lines, message texts and attachment names. Additionally the address that the email appears to originate from may be fake.

The subject line of the email is randomly chosen from the following list:
Are you a Soccer Fan ? Are you beautiful Are you in Love Are you looking for Love Are you the BEST Check it out Check this shit Check ur friends Circle Demo KOF 2002 Feel the fragrance of Love Find a good friend Freak Out Free Demo Game Free rAVs Screensavers Free Screenavers of Love Free Screensavers Free Screensavers 4 U Free Win32 API source Free XXX Hardcore Screensavers 4 U Hello hey check it yaar Hi How sweet this Screen saver I am in Love I Love You I Love You.. Jenna 4 U Learn How To Love Learn SQL 4 Free Let',27h,'s Dance and forget pains Looking for Friendship love speaks from the heart Lovers Corner make ur friend happy Need a friend? Need money ?? One Hacker',27h,'s Love One Virus Writer',27h,'s Story Patch for Elkern.gen Patch for Klez.H Play KOF 2002 4 Free Project Sample KOF 2002 Sample Playboy Sample Screensavers Say ',27h,'I Like You',27h,' To ur friend Screensavers from Club Jenna Sexy Screensavers 4 U Shake it baby The Hotmail Hack The King of KOF The world of Friendship Things to note to ur friends to ur lovers True Love U realy Want this Visit us Wanna be a HE-MAN Wanna be friends ? Wanna be friends ?? Wanna be like a stone ? Wanna be my sweetheart ?? Wanna Brawl ?? Wanna Hack ?? Wanna Rumble ?? war Againest Loneliness We want peace Whats up Who is ur Best Friend Who is your Valentine World Tour Wowwwwwwwwwww check it WWE Screensavers XXX Screensavers 4 U You are so sweet

The message text is randomly chosen from the following texts:
"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 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.."

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.."

check the attached screensaver and you will learn how to
make your friends happy.."

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...
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.

Best Regards,
Admin,KOF ONLINE..

<<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>><<<<<>>>>>"

If youwanna 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.."

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"

Please note that the registration process is completely freewhich means
by participating in this program you will only gain without loosing anything.

Best Regards,
Admin,"

The attachment containing the worm can have any of the following filenames:

The email may contain a FROM field constructed from the following two lists. The name is taken from the first list and the email address is taken from the corresponding position in the second list:

On the 25th of March and the 22nd of May this virus will display a message box containing the text "Happy Birthday Dear". Also the operation of the mouse buttons will be swapped.

On a Thursday W32/Yaha-K will perform the following three actions:

set the hidden attribute on all files and folders in the Personal Shell Folder, usually My Documents

create a text file named aYerHS.txt on the Desktop containing one of the following five messages:

change the default Internet Explorer start up page via the registry entry HKLM\Software\Microsoft\Internet Explorer\Main to one of the following web sites: www.hrvg.tk, www.hackersclub.up.to, geocities.com/snak33ys, www.unixhideout.com, www.hirosh.tk, www.neworder.box.sk, www.blacksun.box.sk, www.coderz.net, www.hackers.com/html/neohaven.html, www.ankitfadia.com.

Finally W32/Yaha-K will execute a denial of service attack against a Pakistani government website, infopak.gov.pk.

Get reports about the latest virus and spyware threats delivered to your computer

In this section

W32/Yaha-K

Summary

Action

More Information