W32/Mytob-AU

Please follow the instructions for removing worms.

Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Close the registry editor.

W32/Mytob-AU is a mass-mailing worm with backdoor functionality that can be controlled through the Internet Relay Chat (IRC) network.

When first run W32/Mytob-AU copies itself to the Windows system folder as internet.exe and creates the following registry entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Internet Services
internet.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Internet Services
internet.exe

W32/Mytob-AU also appends the following to the HOSTS file to deny access to security related websites:

127.0.0.1 avp.com
127.0.0.1 ca.com
127.0.0.1 customer.symantec.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 download.mcafee.com
127.0.0.1 f-secure.com
127.0.0.1 kaspersky-labs.com
127.0.0.1 kaspersky.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 liveupdate.symantecliveupdate.com
127.0.0.1 mast.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 nai.com
127.0.0.1 networkassociates.com
127.0.0.1 rads.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 sophos.com
127.0.0.1 symantec.com
127.0.0.1 trendmicro.com
127.0.0.1 update.symantec.com
127.0.0.1 updates.symantec.com
127.0.0.1 us.mcafee.com
127.0.0.1 viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 www.avp.com
127.0.0.1 www.ca.com
127.0.0.1 www.f-secure.com
127.0.0.1 www.grisoft.com
127.0.0.1 www.kaspersky.com
127.0.0.1 www.mcafee.com
127.0.0.1 www.microsoft.com
127.0.0.1 www.my-etrust.com
127.0.0.1 www.nai.com
127.0.0.1 www.networkassociates.com
127.0.0.1 www.sophos.com
127.0.0.1 www.symantec.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.viruslist.com

W32/Mytob-AU is capable of spreading through email. Email sent by W32/Mytob-AU has the following properties:

Subject line:

Notice: **Last Warning**
Your email account access is restricted
Your Email Account is Suspended For Security Reasons
Notice:***Your email account will be suspended***
Security measures
Email Account Suspension
*IMPORTANT* Please Validate Your Email Account
*IMPORTANT* Your Account Has Been Locked

Message text:

Account Information Are Attached!
Follow the instructions in the attachment.
Once you have completed the form in the attached file , your account records will not be interrupted and will continue as normal.
please look at attached document.
To safeguard your email account from possible termination, please see the attached file.
To unblock your email account acces, please see the attachment.
We have suspended some of your email services, to resolve the problem you should read the attached document.

The attached file consists of a base name followed by the extensions PIF, SCR, EXE or ZIP. The base names will be one of the following:

document_full
email-doc
email-info
email-text
IMPORTANT
info-text
information
your_details

W32/Mytob-AU harvests email addresses from files on the infected computer and from the Windows address book. The worm avoids sending email to addresses that contain the following:

.gov
.mil
accoun
acketst
admin
anyone
arin.
avp
berkeley
borlan
bsd
bsd
bugs
ca
certific
contact
example
feste
fido
foo.
fsf.
gnu
gold-certs
google
google
gov.
help
iana
ibm.com
icrosof
icrosoft
ietf
info
inpris
isc.o
isi.e
kernel
linux
linux
listserv
math
me
mit.e
mozilla
mydomai
no
nobody
nodomai
noone
not
nothing
ntivi
page
panda
pgp
postmaster
privacy
rating
rfc-ed
ripe.
root
ruslis
samples
secur
sendmail
service
site
soft
somebody
someone
sopho
submit
support
syma
tanford.e
the.bat
unix
unix
usenet
utgers.ed
webmaster
you
your

W32/Mytob-AU will attempt to terminate the processes associated with the following files:

cmd.exe
gedit.exe
msconfig.exe
navapw32.exe
navw32.exe
netstat.exe
PandaAVEngine.exe
taskmgr.exe
wincfg32.exe
zapro.exe
zonealarm.exe