WORM_MYTOB.GB

July 3, 2005, 1:00 pm

Malware type: Worm
Aliases: W32.Mytob.GP@mm, W32/Mytob.gen@MM
In the wild: Yes
Destructive: No
Language: English
Platform: Windows 2000, XP
Encrypted: No
Characteristics: Propagates via email

Description: 

Like other MYTOB variants, this memory-resident worm propagates by sending a copy of itself as an attachment to an email message, which it sends to target recipients using its own Simple Mail Transfer Protocol (SMTP) engine.

It generates email addresses by using a list of names and any of the domain names of the previously gathered addresses.

The email it sends out has the following details:

Subject: (any of the following
• {Random}
• *DETECTED* Online User Violation
• Email Account Suspension
• Important Notification
• Members Support
• Notice of account limitation
• Security measures
• You have successfully updated your password
• Your Account is Suspended
• Your Account is Suspended For Security Reasons
• Your new account password is approved
• Your password has been successfully updated
• Your password has been updated

Message body: (any of the following
Dear user {user name}, You have successfully updated the password of your {domain} account.

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

Thank you for using {domain}!
The {domain} Support Team

+++ Attachment: No Virus (Clean)
+++ {domain} Antivirus - www.{domain}


Dear user {user name},

It has come to our attention that your {domain} User Profile ( x ) records are out of date. For further details see the attached document.

Thank you for using {domain}!
The {domain} Support Team

+++ Attachment: No Virus (Clean)
+++ {domain} Antivirus www.{domain}


Dear {domain} 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} account.

Sincerely,The {domain} Support Team

+++ Attachment: No Virus (Clean)
+++ {domain} Antivirus - www.{domain}


Dear {domain} 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} Support Team

+++ Attachment: No Virus found
+++ {domain} Antivirus www.{domain}

(NOTE: {domain} is the recipient's domain name. {email address} is the recipient's email address. {domain address} is the recipient's domain address. {user name} is the recipient's user name.)

The attachment uses a double extension technique in order to trick users into clicking the attached file.

Attachment: (any of the following file names
• {Random}
• accepted-password
• account-details
• account-info
• account-password
• account-report
• approved-password
• document
• email-details
• email-password
• important-details
• new-password
• password
• readme
• updated-password

(with any of the following as first extension
• BAT
• CMD
• DOC
• HTM
• TMP
• TXT

(with any of the following as second extension
• EXE
• PIF
• SCR

It accesses the following Web site to download the file WINSOCK.EXE detected by Trend Micro as TROJ_RANKY.EW:

    http://www.game{BLOCKED}niac.com

It has backdoor capabilities, which enable it to connect to the Internet Relay Chat (IRC) server, hack3rz.turanduygu.com. Once a connection is established, it joins the IRC channel #.m1r, where it listens for certain commands from a remote malicious user.

Moreover, it prevents users from accessing several antivirus and security Web sites by redirecting the connection to the local machine.

Solution:

MANUAL REMOVAL INSTRUCTIONS

Identifying the Malware Program

To remove this malware, first identify the malware program.

  1. Scan your system with your Trend Micro antivirus product.
  2. NOTE the path and file name of all files detected as WORM_MYTOB.GB.

Trend Micro customers need to download the latest pattern file before scanning their system. Other users can use Housecall, Trend Micro's online virus scanner.

Terminating the Malware Program

This procedure terminates the running malware process.

  1. Open Windows Task Manager.
    • On Windows 2000 and XP, press
    CTRL+SHIFT+ESC, then click the Processes tab.
  2. In the list of running programs*, locate the process:
    deneme.exe
    or
    {file(s) detected earlier}
  3. Select the malware process, then press either the End Task or the End Process button, depending on the version of Windows on your system.
  4. To check if the malware process has been terminated, close Task Manager, and then open it again.
  5. Close Task Manager.

Editing the Registry

This malware modifies the system's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

  1. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP
  2. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000

Removing Autostart Entries from the Registry

Removing autostart entries from the registry prevents the malware from executing at startup.

If the registry entries below are not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

  1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
  2. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>Run
  3. In the right panel, locate and delete the entry:
    WINDOWS DENEME = "deneme.exe"
  4. In the left panel, double-click the following:
    HKEY_LOCAL_MACHINE>Software>Microsoft>
    Windows>CurrentVersion>RunServices
  5. In the right panel, locate and delete the entry:
    WINDOWS DENEME = "deneme.exe"
  6. Close Registry Editor.

Removing Malware Entries from the HOSTS File

Deleting malware entries from the HOSTS file removes all malware-made changes on host name association.

  1. Open the following file using a text editor (such as NOTEPAD ):
    %System%\drivers\etc\HOSTS
    (Note: %System% is the Windows system folder, which is usually C:\WINNT\System32 on Windows 2000 and C:\Windows\System32 on Windows XP.)
  2. Delete the following entries:
    • 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 ebay.com
    • 127.0.0.1 f-secure.com
    • 127.0.0.1 kaspersky-labs.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 microsoft.com
    • 127.0.0.1 moneybookers.com
    • 127.0.0.1 my-etrust.com
    • 127.0.0.1 nai.com
    • 127.0.0.1 networkassociates.com
    • 127.0.0.1 pandasoftware.com
    • 127.0.0.1 paypal.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 virustotal.com
    • 127.0.0.1 www.amazon.ca
    • 127.0.0.1 www.amazon.co.uk
    • 127.0.0.1 www.amazon.com
    • 127.0.0.1 www.amazon.fr
    • 127.0.0.1 www.avp.com
    • 127.0.0.1 www.ca.com
    • 127.0.0.1 www.ebay.com
    • 127.0.0.1 www.f-secure.com
    • 127.0.0.1 www.grisoft.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.moneybookers.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.pandasoftware.com
    • 127.0.0.1 www.paypal.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
    • 127.0.0.1 www.virustotal.com
  3. Save the file and close the text editor.

Additional Windows XP Cleaning Instructions

Users running Windows XP must disable System Restore to allow full scanning of infected systems.

Users running other Windows versions can proceed with the succeeding procedure set(s).

Running Trend Micro Antivirus

Scan your system with Trend Micro antivirus and delete files detected as WORM_MYTOB.GB and TROJ_RANKY.EW. To do this, Trend Micro customers must download the latest pattern file and scan their system. Other Internet users can use HouseCall, Trend Micro's online virus scanner.

 




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