W32/Mytob.MX Worm

 Information about the W32/Mytob.MX Worm:

W32/Mytob.MX is a mass mailing worm. This worm is a variant of W32/Mytob.A. The worm will infect Windows systems and spreads through email.

The subject of the infected mail will be any one of the following;

*DETECTED* Online User Violation
[random]
Warning Message: Your services near to be closed.
YOU HAVE SUCCESSFULLY UPDATED YOUR PASSWORD
Important Notification
Notice of account limitation
Security measures
You have successfully updated your password
*DETECTED* ONLINE USER VIOLATION
Your Account is Suspended For Security Reasons
Your new account password is approved
YOUR PASSWORD HAS BEEN SUCCESSFULLY UPDATED
Your Account is Suspended
Your password has been successfully updated
YOUR PASSWORD HAS BEEN UPDATED
Your password has been updated

The body of the infected mail will be any one of the following;

Dear [user] 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 [domain name] account.
Sincerely,The [domain name] Support Team
+++ Attachment: No Virus (Clean)
+++ [domain name] Antivirus www.[domain name]

Dear user [user],

It has come to our attention that your [user], ( x ) records are out of date. For further details see the attached document.

Thank you for using [domain name]!
The [domain name] Support Team
+++ Attachment: No Virus (Clean)
+++ "Name" Antivirus - www.[domain name].com

Dear user [user],

You have successfully updated the password of your [domain name] account.

If you did not authorize this change or if you need assistance with your account, please contact customer service at: {Email address of infected user}

Thank you for using [domain name]!
The [domain name] Support Team
+++ Attachment: No Virus (Clean)
+++ [domain name] Antivirus - www. [domain name]

Dear [user] 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 [domain name], Support Team

The infected attachment will be any one of the following;

account-details.zip
account-report.zip
account-password.zip
approved-password.zip
document.zip
[random].zip
account-info.zip
email-details.zip
email-password.zip
updated-password.zip
important-details.zip
new-password.zip
password.zip

The attached archive file contains a double extension file, the first extension can be any one of these;

doc, txt or htm.

The second extension can be any one of these;

exe, pif, scr or zip.

Upon execution of the infected attachment, the worm drops a copy of W32/Monurl.D Trojan as syst.exe in the Windows System folder.

The worm modifies registry at the following location;

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

To propagate itself, the worm scans the files having the following extensions and collects all the available email addresses from the infected system.

adb, asp, dbx, htm, php, pl, sht, tbb and wab.

The worm mails itself to these addresses using its own SMTP engine.

This worm first appeared on November 23, 2005.

 Other names of W32/Mytob.MX Worm:

This Worm is also known as WORM_MYTOB.MX.