Due to an increase in submissions, Symantec Security Response has upgraded this threat from a Category 2 to a Category 3 as of December 30, 2002.
W32.Yaha.K@mm is a worm that is a variant of W32.Yaha.J@mm. This worm terminates some antivirus and firewall processes. It uses its own SMTP engine to email itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, and all the files whose extensions contain the letters HT. The email message has randomly chosen the 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], W32/Yaha.M-mm [MessageLabs]
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
Damage
Payload:
Large scale e-mailing: Emails itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, and all the files whose extensions contain the letters HT.
Degrades performance: Attempts to perform a Denial of Service against a Pakistani website.
Compromises security settings: It terminates some antivirus and firewall processes.
Distribution
Subject of email: Varies
Name of attachment: Varies
Size of attachment: 34,304 bytes
When W32.Yaha.K@mm runs, it does the following:
1. 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 worm locates the Windows system folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows 2000/NT/), or C:\Windows\System32 (Windows XP).
2. It adds the value:
WinServices C:\%System%\WinServices.exe
to the registry keys
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Run
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\
CurrentVersion\RunServices
so that the worm runs when you start Windows.
3. The worm configures itself to run each time an .exe file runs, by changing the default value of the registry key
HKEY_LOCAL_MACHINE\Software\Classes\exefile\shell\ open\command
to
C:\%System%\Nav32_loader.exe"%1 %*
4. The worm may also copy itself to the \Windows\System folder 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
5. The worm attempts to end the antivirus and firewall processes. The worm inventories the active processes, and if the name of the process contains one of the following, it attempts to end 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
Additionally, if the infected computer is a Windows NT/2000/XP system, the worm will automatically terminate the Windows Task Manager program from memory.
6. The worm attempts to perform a Denial of Service attack against the website infopak.gov.pk.
Email Routine Details
The worm uses its own SMTP engine to email itself to all the contacts in the Windows Address Book, MSN Messenger, .NET Messenger, Yahoo Pager, and all the files whose extensions contain the letters HT. It attempts to use the infected computer's default SMTP server to send mail. If the worm cannot find this information, then it uses one of the many SMTP server addresses, which are hard-coded into the worm. The email message has the following characteristics:
Subject: The 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: The 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: The 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 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 system date is March 25 or May 22, the worm displays the following message and switches the functions of the left and right mouse buttons:
If the system day is Thursday, the worm performs these actions:
1. Randomly changes the Value data of the Start Page value
in the registry key
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
to one of these:
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
2. Retrieves the location of the current user's documents folder from the registry key
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\
Explorer\Shell Folders
and then it sets the attributes of this folder, all the subfolders in this folder, and all the files in this folder and its subfolders to hidden. In most cases, this folder is the \My Documents folder.
3. Creates the text file aYeHS.txt on the Windows desktop. The attributes of the file are set to hidden and archive. The file contains one of the following text messages:
================================================== ==========
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$t fRi3nD
================================================== ==========
>>
qph@hackermail.com
or
==================================================
W32.@YerH$.B,Made in India,
wE aRe thE greAt iNdIaNs..
----------------------------
aBouT mE :
jUst a c0mputEr gEEk..
i tHinK i aM sTill a sCripT kiddiE..
eDucAtiOn : sCh00l sTudEnt..
aBouT @YerH$.B:
n0 dEstrucTivE paYload$ f0r inFecTeD c0mpUteRs.
teRminAtioN oF aV + FireWaLL f0r sUrvIvaL.
tImE dEfiNed tRigErRinG.. jUst f0r fUn.. n0 paYloaD.
c0ntAinS bUg iN rEpliCation c0de.. no tIme t0 fiX.
g0nNa fiX iT iN nExt rElEase..
n0 m0rE $hiT
================================================== =
>>
qph@hackermail.com
or
==================================================
W32.@YerH$.B,Made in India,
wE aRe thE greAt iNdIaNs..
----------------------------
spEciAl 10x to c0bra..
f0r inSpirAtIon + c0dIng hElp..
==================================================
>>
qph@hackermail.com
or
================================================== ====
W32.@YerH$.B,Made in India
wE aRe thE greAt iNdIaNs..
----------------------------
wAnT peAce aNd pr0speRity in InDiA ?..
f**k tHe c0rruptEd p0litiCian$..no ****$ 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 $hiT m0n0p0lY..
================================================== ====
>>
qph@hackermail.com
or
=================================================
W32.@YerH$.B,Made in India.
wE aRe thE greAt iNdiAnS.
----------------------------
iNdiAn hAckeRs + vXerS teAm up...
aNd kicK lamEr a**
no m0re pAk ****..
itZ oUr tiMe to shOw tHem, the p0wer of teaM w0rk.
f**k AIC,GFORCE,SILVERLORDS,WFD..f*****g k1dd1es..
no **** bUsineSS iN heRe aNd
nO lamE stuFF..
=================================================
>>
qph@hackermail.com