W32/Mytob-AK

Please follow the instructions for removing worms.

Replace the Hosts file from a backup or edit it in Notepad to remove the changes that the worm has made.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entry:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Mytob-AK is a mass-mailing worm with IRC backdoor functionality for the windows platform..

W32/Mytob-AK is capable of spreading through operating system vulnerabilities, including the LSASS (MS04-011) exploit.

W32/Mytob-AK can harvest email addresses from files on the infected computer and from the Windows address book.

Emails sent by the worm have the following characteristics:

Subject line:
Error
Status
Server Report
Mail Transaction Failed
Mail Delivery System
hello
Good day
<blank>

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

Mail transaction failed. Partial message is available.

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,

Here are your bank documents W32/Mytob-AK is a mass-mailing worm with IRC backdoor functionality for the windows platform..

W32/Mytob-AK is capable of spreading through operating system vulnerabilities, including the LSASS (MS04-011) exploit. The following patches for the operating system vulnerabilities exploited by W32/Mytob-AK can be obtained from the Microsoft website:

MS04-011

W32/Mytob-AK can harvest email addresses from files on the infected computer and from the Windows address book.

Emails sent by the worm have the following characteristics:

Subject line:
Error
Status
Server Report
Mail Transaction Failed
Mail Delivery System
hello
Good day
<blank>

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

Mail transaction failed. Partial message is available.

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,

Here are your bank documents

W32/Mytob-AK copies itself to the Windows system folder as "taskgmr32.exe" or "t4skmgr.exe" and creates the following registry entries in order to run automatically on computer logon:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
WINTASK

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
WINTASK

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
WINTASK

The worm also creates the following registry entries to point to itself:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa\
WINTASK

HKCU\Software\Microsoft\OLE\
WINTASK

HKLM\SOFTWARE\Microsoft\Ole\
WINTASK

W32/Mytob-AK copies itself to the root folder with the following filenames:

funny_pic.scr
my_photo2005.scr
see_this!!.scr

W32/Mytob-AK blocks access to security-related websites by writing the following entries to the Windows hosts file:

127.0.0.1 avp.com
127.0.0.1 ca.com
127.0.0.1 customer.symantec.com
127.0.0.1 dispatch.mcafee.com
127.0.0.1 download.mcafee.com
127.0.0.1 f-secure.com
127.0.0.1 kaspersky.com
127.0.0.1 liveupdate.symantec.com
127.0.0.1 liveupdate.symantecliveupdate.com
127.0.0.1 mast.mcafee.com
127.0.0.1 mcafee.com
127.0.0.1 my-etrust.com
127.0.0.1 nai.com
127.0.0.1 networkassociates.com
127.0.0.1 rads.mcafee.com
127.0.0.1 secure.nai.com
127.0.0.1 securityresponse.symantec.com
127.0.0.1 sophos.com
127.0.0.1 symantec.com
127.0.0.1 trendmicro.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 viruslist.com
127.0.0.1 viruslist.com
127.0.0.1 www.avp.com
127.0.0.1 www.ca.com
127.0.0.1 www.f-secure.com
127.0.0.1 www.kaspersky.com
127.0.0.1 www.mcafee.com
127.0.0.1 www.microsoft.com
127.0.0.1 www.my-etrust.com
127.0.0.1 www.nai.com
127.0.0.1 www.networkassociates.com
127.0.0.1 www.sophos.com
127.0.0.1 www.symantec.com
127.0.0.1 www.trendmicro.com
127.0.0.1 www.viruslist.com

W32/Mytob-AK may create a new file detected by Sophos as W32/Mytob-D.