W32/Mytob.AM Worm

 Virus Information - W32/Mytob.AM Worm:

W32/Mytob.AM is a 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 will be any one of the following;

contact@symantec.com
support@yahoo.com
admin@fbi.gov
contact@cia.gov
postmaster@fbi.gov
contact@microsoft.com

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

Is that your password?
It's you!?
read it immediately
Re: Approved document
Hello
Re: Your document
Re: Administration
Congratulations!
approved
Bonjour

The infected attachment will be any one of the following;

document
details
data
important information
your_doc
message
body

with any one of these extensions;

pif, scr, exe, bat.

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

The original message was included as an attachment.

I have attached your informations.

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

Your document is attached.

For more details see the attachment.

Upon execution of the infected attachment, the worm copies itself as taskgmr.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 attempts to locate SMTP server by appending the following prefixes to the domain names collected from the infected system. On successful SMTP server access it mails itself to the collected email addresses.

mx.
ns.
relay.
mail1.
mxs.
mx1.
smtp.
mail.
gate.