[virusinfo] W32/Mytob-BI
- From: "Mike" <mikebike@xxxxxxxxx>
- To: virusinfo@xxxxxxxxxxxxx
- Date: Mon, 13 Jun 2005 08:28:25 -0700
From; Sophos Alert System:
Name: W32/Mytob-BI
Aliases: Net-Worm.Win32.Mytob.bi
Type: Win32 worm
Date: 13 June 2005
Sophos has issued protection for W32/Mytob-BI.
At the time of writing, Sophos has received a small number of
reports of this worm from the wild.
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-BI can be found at:
http://www.sophos.com/virusinfo/analyses/w32mytobbi.html
W32/Mytob-BI is a mass-mailing worm and IRC backdoor Trojan for the Windows
platform.
W32/Mytob-BI 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-BI copies itself to the Windows system folder as
winsys33.exe and creates the following registry entries:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
WINDOWS SYSTEM
winsys33.exe
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
WINDOWS SYSTEM
winsys33.exe
W32/Mytob-BI also disables the Windows XP firewall by changing the following
default registry entry from:
HKLM\System\CurrentControlSet\Services\SharedAccess
Start
3
to:
HKLM\System\CurrentControlSet\Services\SharedAccess
Start
4
W32/Mytob-BI 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-BI 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-BI is capable of spreading through email. Email sent by W32/Mytob-BI
has the following properties:
Subject lines:
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 texts:
'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> 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 create double extensions where the first extension is DOC, TXT or
HTM and the final extension is PIF, SCR, EXE or ZIP.
W32/Mytob-BI harvests email addresses from files on the infected computer and
from the Windows address book.
The W32/Mytob-BI virus identity file (IDE) includes detection for:
W32/Mytob-BG
http://www.sophos.com/virusinfo/analyses/w32mytobbg.html
Troj/Zlob-E
http://www.sophos.com/virusinfo/analyses/trojzlobe.html
Troj/ZlobDrop-D
http://www.sophos.com/virusinfo/analyses/trojzlobdropd.html
Troj/BankAsh-H
http://www.sophos.com/virusinfo/analyses/trojbankashh.html
Troj/KillAv-AK
http://www.sophos.com/virusinfo/analyses/trojkillavak.html
Troj/Lors-A
http://www.sophos.com/virusinfo/analyses/trojlorsa.html
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-BI from:
http://www.sophos.com/downloads/ide/mytob-bi.ide
Read about how to use IDE files at
http://www.sophos.com/support/knowledgebase/article/363.html
*********** MIKE"S REPLY SEPARATOR ***********
Mike ~ It is a good day if I learned something new.
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