W32/Mytob.AQ Worm

 Information about the W32/Mytob.AQ Worm:

W32/Mytob.AQ 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 infected mail 'From' address prefix will be any one of the following;

adam, alex, alice, andrew, anna, bill, bob, brenda, brent, brian, claudia, dan, dave, david, debby, fred, george, helen, jack, james, jane, jerry, jim, jimmy, joe, john, jose, julie, kevin, leo, linda, maria, mary, matt, michael, mike, peter, ray, robert, sam, sandra, serg, smith, stan, steve, ted, tom.

the suffix after '@' character will be any one of the following domains;

hotmail.com
msn.com
mail.ru
yahoo.com

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

Status
hello
Here is your documents.
Error
Mail Transaction Failed
Mail Delivery System
Server Report
Re: Thank you for delivery
something for you
(Blank subject)

The infected attachment will be any one of the following;

MAIL
DOCUMENT
README
TEXT
FILE
creditcard
ATTACHMENT
LETTER
PayPal
[random string]

with any one of these extensions;

pif, scr, zip, bat, exe, zip.

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

(Random String)

Mail transaction failed. Partial message is available.

The message contains Unicode characters and has been sent as a binary attachment.

The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment.

The original message was included as an attachment.

(Blank Body)

Upon execution of the infected attachment, the worm copies itself as internet.exe in the Windows System folder.

The worm modifies registry at the following location to load itself during each startup.

HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run

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, wab.

It also collects email addresses from the Temporary Internet Files folder.

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

This worm first appeared on 2nd May, 2005.

 Other names of W32/Mytob.AQ Worm:

This Worm is also known as W32.Mytob.BT@mm, Net-Worm.Win32.Mytob.aq, W32/Mytob-Fam, W32/Mydoom.gen@MM.