[virusinfo] W32/Mytob-BL
- From: "Mike" <mikebike@xxxxxxxxx>
- To: virusinfo@xxxxxxxxxxxxx
- Date: Thu, 16 Jun 2005 09:07:33 -0700
From; Sophos Alert System:
Name: W32/Mytob-BL
Aliases: Net-Worm.Win32.Mytob.bi
Type: Win32 worm
Date: 16 June 2005
Sophos has issued protection for W32/Mytob-BL.
At the time of writing, Sophos has received no reports from
users affected by this worm. However, we have issued this
advisory following enquiries to our support department from
customers.
Customers using EM Library, Enterprise Console, PureMessage or
any of our Sophos small business solutions will be automatically
protected at their next scheduled update.
Information about W32/Mytob-BL can be found at:
http://www.sophos.com/virusinfo/analyses/w32mytobbl.html
W32/Mytob-BL is a mass-mailing worm and IRC backdoor Trojan for the Windows
platform.
W32/Mytob-BL runs continuously in the background, providing a backdoor server
which allows a remote intruder to gain access and control over the computer via
IRC channels.
When first run W32/Mytob-BL copies itself to <System>\h3.exe.
The following registry entries are created to run h3.exe on startup:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WINDOWS SYSTEM Cleaner
h3.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
WINDOWS SYSTEM Cleaner
h3.exe
W32/Mytob-BL sets the following registry entries, disabling the automatic
startup of other software:
HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess
Start
4
W32/Mytob-BL also includes functionality to silently download, install and run
new software.
Registry changes may also be made under the following registry entry:
HKCU\Software\Microsoft\Windows\CurrentVersion\Internet
Settings\Zones\3\Current Level
W32/Mytob-BL modifies the HOSTS file, changing the URL-to-IP mappings for
selected websites, therefore preventing normal access to these sites. The new
HOSTS file will typically contain the following:
127.0.0.1 www.symantec.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 symantec.com
127.0.0.1 www.sophos.com
127.0.0.1 sophos.com
127.0.0.1 www.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 liveupdate.symantecliveupdate.com
127.0.0.1 www.viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 f-secure.com
127.0.0.1 www.f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 kaspersky-labs.com
127.0.0.1 www.avp.com
127.0.0.1 www.kaspersky.com
127.0.0.1 avp.com
127.0.0.1 www.networkassociates.com
127.0.0.1 networkassociates.com
127.0.0.1 www.ca.com
127.0.0.1 ca.com
127.0.0.1 mast.mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 www.my-etrust.com
127.0.0.1 download.mcafee.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 nai.com
127.0.0.1 www.nai.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 liveupdate.symantec.com
127.0.0.1 customer.symantec.com
127.0.0.1 rads.mcafee.com
127.0.0.1 trendmicro.com
127.0.0.1 pandasoftware.com
127.0.0.1 www.pandasoftware.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.grisoft.com
127.0.0.1 www.microsoft.com
127.0.0.1 microsoft.com
127.0.0.1 www.virustotal.com
127.0.0.1 virustotal.com
127.0.0.1 www.amazon.com
127.0.0.1 www.amazon.co.uk
127.0.0.1 www.amazon.ca
127.0.0.1 www.amazon.fr
127.0.0.1 www.paypal.com
127.0.0.1 paypal.com
127.0.0.1 moneybookers.com
127.0.0.1 www.moneybookers.com
127.0.0.1 www.ebay.com
127.0.0.1 ebay.com
W32/Mytob-BL is capable of spreading through email. Email sent by W32/Mytob-BL
has the following properties:
Subject line chosen from:
'Your Account is Suspended'
'*DETECTED* Online User Violation'
'Your Account is Suspended For Security Reasons'
'Warning Message: Your services near to be closed.'
'Important Notification'
'Members Support'
'Security measures'
'Email Account Suspension'
'Notice of account limitation'
Message text chosen from:
'Dear <company name> Member,
We have temporarily suspended your email account <email address>.
This might be due to either of the following reasons:
1. A recent change in your personal information (i.e. change of address).
2. Submiting invalid information during the initial sign up process.
3. An innability to accurately verify your selected option of subscription due
to an internal error within our processors.
See the details to reactivate your <company name> account.
Sincerely,The <company name> Support Team
+++ Attachment: No Virus (Clean)
+++ <company name> Antivirus - <web address>'
'Dear <company name> Member,
Your e-mail account was used to send a huge amount of unsolicited spam messages
during the recent week. If you could please take 5-10 minutes out of your
online experience and confirm the attached document so you will not run into
any future problems with the online service.
If you choose to ignore our request, you leave us no choice but to cancel your
membership.
Virtually yours,
The <company name> Support Team
+++ Attachment: No Virus found
+++ <company name> Antivirus - <web address>'
'Dear user <username>,
You have successfully updated the password of your <company name> account.
If you did not authorize this change or if you need assistance with your
account, please contact <company name> customer service at: <email address>
Thank you for using <company name>!The <company name> Support Team
+++ Attachment: No Virus (Clean)
+++ <company name>l; Antivirus - <web address>'
'Dear user <username>,
It has come to our attention that your <company name> User Profile ( x )
records are out of date. For further details see the attached document.
Thank you for using <company name>!
The <company name> Support Team
+++ Attachment: No Virus (Clean)
+++ <company name> Antivirus - <web address>'
The attached file consists of any of the following base names followed by the
extention ZIP:
'important-details'
'account-details'
'email-details'
'account-info'
'document'
'readme'
'account-report'
'updated-password'
'email-password'
'new-password'
'password'
'approved-password'
'account-password'
'accepted-password'
<random characters>
The worm may optionally create double extensions where the first extension is
DOC, TXT or HTM and the final extension is PIF, SCR, EXE or ZIP.
W32/Mytob-BL harvests email addresses from files on the infected computer and
from the Windows address book.
Sophos's anti-virus products include Genotype ? detection technology, which can
proactively protect against new threats without requiring an update. Sophos
customers have been protected against W32/Mytob-BL (detected as W32/MyDoom-Gen)
since version 3.92.
Customers with 3.xx or lower versions of Sophos Anti-Virus,
who are not running EM Library, can manually download the IDE
for W32/Mytob-BL from:
http://www.sophos.com/downloads/ide/mytob-bl.ide
Read about how to use IDE files at
http://www.sophos.com/support/knowledgebase/article/363.html
*********** MIKE"S REPLY SEPARATOR ***********
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