W32.Opanki.B is an IRC threat that may spread through AOL Instant Messenger.

Also Known As: IRC Trojan, IM-Worm.Win32.Opanki.d [Kaspersky Lab], W32/Opanki.worm.gen [McAfee]

Type: Worm

Infection Length: 3,973 bytes

Systems Affected: Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP

Removal Instructions:
 

You can scan your computer for Opanki.B and other types of viruses and trojans for FREE with ARNIT Online Virus Scanner athttp://www.arnit.net/security/tplarnit.php?page=vscan

Or you may read the following manual removal instructions:

The following instructions pertain to all current and recent Symantec antivirus products, including the Symantec AntiVirus and Norton AntiVirus product lines.

1. Disable System Restore (Windows Me/XP).
2. Update the virus definitions.
3. Run a full system scan and delete all the files detected.
4. Delete any values added to the registry.

For specific details on each of these steps, read the following instructions.

1. To disable System Restore (Windows Me/XP)
If you are running Windows Me or Windows XP, we recommend that you temporarily turn off System Restore. Windows Me/XP uses this feature, which is enabled by default, to restore the files on your computer in case they become damaged. If a virus, worm, or Trojan infects a computer, System Restore may back up the virus, worm, or Trojan on the computer.

Windows prevents outside programs, including antivirus programs, from modifying System Restore. Therefore, antivirus programs or tools cannot remove threats in the System Restore folder. As a result, System Restore has the potential of restoring an infected file on your computer, even after you have cleaned the infected files from all the other locations.

Also, a virus scan may detect a threat in the System Restore folder even though you have removed the threat.

For instructions on how to turn off System Restore, read your Windows documentation, or one of the following articles:

* How to disable or enable Windows Me System Restore
* How to turn off or turn on Windows XP System Restore


Note: When you are completely finished with the removal procedure and are satisfied that the threat has been removed, reenable System Restore by following the instructions in the aforementioned documents.

For additional information, and an alternative to disabling Windows Me System Restore, see the Microsoft Knowledge Base article: Antivirus Tools Cannot Clean Infected Files in the _Restore Folder (Article ID: Q263455).

2. To update the virus definitions
Symantec Security Response fully tests all the virus definitions for quality assurance before they are posted to our servers. There are two ways to obtain the most recent virus definitions:

* Running LiveUpdate, which is the easiest way to obtain virus definitions: These virus definitions are posted to the LiveUpdate servers once each week (usually on Wednesdays), unless there is a major virus outbreak. To determine whether definitions for this threat are available by LiveUpdate, refer to the document: Virus Definitions (LiveUpdate).
* Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted daily. You should download the definitions from the Symantec Security Response Web site and manually install them. To determine whether definitions for this threat are available by the Intelligent Updater, refer to the document: Virus Definitions (Intelligent Updater).

The latest Intelligent Updater virus definitions can be obtained here: Intelligent Updater virus definitions. For detailed instructions read the document: How to update virus definition files using the Intelligent Updater.



3. To scan for and delete the infected files

1. Start your Symantec antivirus program and make sure that it is configured to scan all the files.
* For Norton AntiVirus consumer products: Read the document: How to configure Norton AntiVirus to scan all files.
* For Symantec AntiVirus Enterprise products: Read the document: How to verify that a Symantec Corporate antivirus product is set to scan all files.
2. Run a full system scan.
3. If any files are detected, click Delete.


Important: If your Symantec antivirus product reports that it cannot delete a detected file, Windows may be using the file. To fix this, run the scan in Safe mode. For instructions, read the document: How to start the computer in Safe Mode. Once you have restarted in Safe mode, run the scan again.

After the files are deleted, restart the computer in Normal mode and proceed with the next section.

Warning messages may be displayed when the computer is restarted, since the threat may not be fully removed at this point. You can ignore these messages and click OK. These messages will not appear when the computer is restarted after the removal instructions have been fully completed. The messages displayed may be similar to the following:

Title: [File path]
Message body: Windows cannot find [file name]. Make sure you typed the name correctly, and then try again. To search for a file, click the Start button, and then click Search.


4. To delete the value from the registry
Important: Symantec strongly recommends that you back up the registry before making any changes to it. Incorrect changes to the registry can result in permanent data loss or corrupted files. Modify the specified subkeys only. For instructions refer to the document: How to make a backup of the Windows registry.

1. Click Start > Run.
2. Type regedit
3. Click OK.

Note: If the registry editor fails to open the threat may have modified the registry to prevent access to the registry editor. Security Response has developed a tool to resolve this problem. Download and run this tool, and then continue with the removal.

4. Navigate to the subkey:

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

5. In the right pane, delete the value:

"WinNite" = "%Windir%\niteaim.exe"

6. Exit the Registry Editor.

 

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