W32/Yaha.k@MM

Content

W32/Yaha.k@MM

Type: Virus
SubType: E-mail worm
Discovery Date: 12/21/2002
Length: 34,304 bytes (UPX packed)
Minimum DAT: 4239 (12/23/2002)
Updated DAT: 4309 (12/17/2003)
Minimum Engine: 5.1.00
Description Added: 12/23/2002
Description Modified: 07/10/2003 4:02 PM (PT)

Risk Assessment

Corporate User: Medium
Home User: Medium

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Characteristics

--- Update December 30, 2002 --
Due to an increase in prevalence, the risk assessment of this threat was upgraded to Medium.

--- Update December 23, 2002 --
The risk assessment of this threat was updated to Low-Profiled due to media attention.

This worm propagates via email using its own built-in SMTP engine. It terminates specific processes if they are running (AV/security related), and contains code to deliver a denial of service attack against a remote machine (the target is hard-coded within the worm).

The worm arrives as an attachment to a message formatted as follows:

From: The from address may be forged (or spoofed) by the virus in such a way that the apparent sender is not the actual sender. The virus caries a list of addresses that it uses as the from address:

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

Subject: (chosen from the following list:)

Are you a Soccer Fan ?
Are you beautiful
Are you the BEST
Check it out
Demo KOF 2002
Feel the fragrance of Love
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
I Love You..
Jenna 4 U
Learn SQL 4 Free
Lovers Corner
Need money ??
One Hacker's Love
One Virus Writer's Story
Patch for Elkern.gen
Patch for Klez.H
Play KOF 2002 4 Free
Project Sample Screensavers
Sample KOF 2002
Sample Playboy
Screensavers from Club Jenna
Sexy Screensavers 4 U
The King of KOF Wanna Brawl ??
Things to note
Visit us
Wanna be a HE-MAN
Wanna be friends ?
Wanna be friends ?
Wanna be like a stone ?
Wanna be my sweetheart ??
Wanna Hack ??
Wanna Rumble ??
We want peace
Whats up
Who is your Valentine
World Tour
WWE Screensavers
XXX Screensavers 4 U

Attachment: Possible filenames include:

Beautifull.scr
Body_Building.scr
Britney_Sample.scr
Codeproject.scr
Cupid.scr
FixElkern.com
FixKlez.com
FreakOut.exe
Free_Love_Screensavers.scr
Hacker.scr
Hacker_The_LoveStory.scr
Hardcore4Free.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
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
SQL_4_Free.scr
Stone.scr
Sweetheart.scr
The_Best.scr
THEROCK.scr
up_life.scr
Valentines_Day.scr
VXer_The_LoveStory.scr
Ways_To_Earn_Money.exe
World_Tour.scr
xxx4Free.scr
zDenka.scr
zXXX_BROWSER.exe

Message Body: Strings within the virus suggest multiple possible message body contents (body contents and attachment filename chosen together):

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..
checkit 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{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 oneof 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 toget 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 areinterested 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 satifiedthen 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,

The virus contains the following strings (similar to previous Yaha variants):

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

Symptoms

The virus copies itself into the Windows System directory (eg. C:\WINDOWS\SYSTEM) multiple times, using the following filenames:

NAV32_LOADER.EXE
TCPSVS32.EXE
WINSERVICES.EXE

System startup is hooked by adding the following Registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
Run "WinServices"= C:\WINDOWS\SYSTEM\WinServices.exe

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\
RunServices "WinServices" = C:\WINDOWS\SYSTEM\WinServices.exe

The subsequent execution of EXE files is also hooked, via modifying the following key:

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

which is changed from:

"%1" %*

to:

"C:\WINDOWS\SYSTEM\nav32_loader.exe""%1"%*

In testing on NT/2000 systems, the virus was observed to make copies of itself in the Windows System directory using a filename from the following list:

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

The virus terminates processes those matching the following (the list is hard-coded within the virus):

_AVP32
_AVPCC
_AVPM
ACKWIN32
ALERTSVC
AMON.EXE
ANTIVIR
ATRACK
AVCONSOL
AVP.EXE
AVP32
AVPCC.EXE
AVPM.EXE
AVSYNMGR
CFINET
CFINET32
ESAFE.EXE
F-AGNT95
F-PROT95
F-STOPW
FP-WIN
FRW.EXE
IAMAPP
IAMSERV.EXE
ICMON
IOMON98
LOCKDOWN2000
LOCKDOWNADVANCED
LUALL
LUCOMSERVER
MCAFEE
N32SCANW
NAVAPSVC
NAVAPW32
NAVLU32
NAVRUNR
NAVW32
NAVWNT
NISSERV
NISUM
NMAIN
NOD32
NORTON
NPSSVC
NRESQ32
NSCHED32
NSCHEDNT
NSPLUGIN
NVC95
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

Method of Infection

The virus installs itself on the victim machine upon execution. It terminates various processes (AV and security product related).

The virus tries to gather email addresses from MAILTO links within *ht*, and *HoTMaiL* files, the Windows Address Book, MSN Messenger contacts, Yahoo Pager contacts. Messages are sent to the addresses found as mentionned above, using SMTP. The default SMTP server is retrieved from the registry:

HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts

Removal

Use current engine and DAT files for detection and removal.

Once infected, VirusScan may not be able to run as the virus can terminate the process before any scanning/removal is accomplished.

This can make the removal of the virus more difficult for users. As such, AVERT has released a removal tool to assist infected users with this virus.

Alternatively, the following steps will circumvent the virus and allow for proper VirusScan scanning/removal, by using the command-line scanner.

Note: The command-line scanner, SCAN.EXE, needs to be run from within the Windows environment in order for registry repair to succeed. Booting to a DOS prompt prior to running SCAN.EXE will result in incomplete virus removal where registry repair is required.

Ensure that you are using the minimum DAT (specified above) or higher
Close all running applications
Disconnect the system from the network
Click START | RUN, type command and hit ENTER
Change to the VirusScan engine directory:
- Win9x/ME - Type cd \progra~1\common~1\networ~1\viruss~1\40~1.xx and hit ENTER
Type scan.exe /adl /clean and hit ENTER
After scanning and removal is complete, reboot the system and reconnect to the network

Additional Windows ME/XP removal considerations

Variants

N/A

All Information

Overview -

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.