W32.Picrate.A@mm

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Discovered: April 14, 2005
Updated: February 13, 2007 12:37:03 PM
Also Known As: Win32.Mugly.J [Computer Associ, Email-Worm.Win32.Wurmark.i [Ka, W32/Mugly.k@MM [McAfee], W32/Wurmark-I [Sophos]
Type: Worm
Systems Affected: Windows



W32.Picrate.A@mm is a worm that sends copies of itself to instant messenger contacts and drops a copy of a W32.Spybot.Worm variant.




This threat leaves behind files with names designed to prevent the user from running essential system tools. To find and remove these files, use the following directions. Please be sure to use the full filename while searching for these files. For example, 'regedit.com' is what needs to be typed in, not just 'regedit'. You may want to enable your computer to show file extensions before searching.

Note: This step is optional. It is not necessary to delete these files to remove the threat from your system.

To enable Windows to display file extensions:

    1. Open My Computer
    2. Click on the Tools menu, and drag down to Folder Options
    3. Click the View tab.
    4. In the 'Advanced Settings' box, uncheck the box next to 'Hide extensions for known file types'
    5. Click OK.


To find and delete files:
Follow the instructions for your operating system:
  • Windows 95/98/Me/NT/2000
    1. Click Start, point to Find or Search, and then click Files or Folders.
    2. Make sure that "Look in" is set to (C:) and that "Include subfolders" is checked.
    3. In the "Named" or "Search for..." box, type, or copy and paste, the file names, ping.com, netstat.com, regedit.com, tasklist.com, taskkill.com, tracert.com, cmd.com, and ansmtp.dll.
    4. Click Find Now or Search Now.
    5. Before deleting the files, verify that the filename and extension match those noted in this document.
    6. Delete the displayed files.
  • Windows XP
    1. Click Start > Search.
    2. Click All files and folders.
    3. In the "All or part of the file name" box, type, or copy and paste, the file names ping.com, netstat.com, regedit.com, tasklist.com, taskkill.com, tracert.com, cmd.com, and ansmtp.dll.
    4. Verify that "Look in" is set to "Local Hard Drives" or to (C:).
    5. Click More advanced options.
    6. Check Search system folders.
    7. Check Search subfolders.
    8. Click Search.
    9. Before deleting the files, verify that the filename and extension match those noted in this document.
    10. Delete the displayed files.


Antivirus Protection Dates

  • Initial Rapid Release version April 15, 2005
  • Latest Rapid Release version April 15, 2005
  • Initial Daily Certified version April 15, 2005
  • Latest Daily Certified version April 15, 2005
  • Initial Weekly Certified release date April 16, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Writeup By: Paul Mangan

Discovered: April 14, 2005
Updated: February 13, 2007 12:37:03 PM
Also Known As: Win32.Mugly.J [Computer Associ, Email-Worm.Win32.Wurmark.i [Ka, W32/Mugly.k@MM [McAfee], W32/Wurmark-I [Sophos]
Type: Worm
Systems Affected: Windows


When W32.Picrate.A@mm is executed, it performs the following actions:

  1. Opens the following URL in the default browser:

    • www.[domain removed].com/forums/LOL-AlbinoGorrilla.jpg

  2. Drops the following files:

    • %SystemDrive%\bx.exe (a copy of W32.Spybot.Worm)
    • %System%\netstat.com (a corrupt executable file)
    • %System%\ping.com (a corrupt executable file)
    • %System%\tracert.com (a corrupt executable file)
    • %System%\tasklist.com (a corrupt executable file)
    • %System%\taskkill.com (a corrupt executable file)
    • %System%\regedit.com (a corrupt executable file)
    • %System%\cmd.com (a corrupt executable file)
    • %System%\xtc.tmp (a copy of the worm)
    • %System%\Attachement.zip (a Zip archive of the worm)
    • %System%\bszip.dll (a legitimate DLL used to handle Zip archives)
    • %System%\ANSMTP.DLL (a legitimate DLL used for mail functionality)


      Note:
      • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
      • Note: %SystemDrive% is a variable that refers to the drive on which Windows is installed. By default, this is drive C.

  3. Creates the following registry keys with the installation of ANSMTP.DLL:

    HKEY_CLASSES_ROOT\ANSMTP.OBJ.1
    HKEY_CLASSES_ROOT\ANSMTP.OBJ
    HKEY_CLASSES_ROOT\ANSMTP.MassSender.1
    HKEY_CLASSES_ROOT\ANSMTP.MassSender
    HKEY_CLASSES_ROOT\CLSID\{253664FB-EDFC-4AC6-BD69-B322F466AEED}
    HKEY_CLASSES_ROOT\CLSID\{887A577B-406B-48FF-80CB-70752BFCD7B4}
    HKEY_CLASSES_ROOT\Typelib\{DE6317F7-6EF0-45C2-88D1-8E09415817F1}
    HKEY_CLASSES_ROOT\Interface\{68B8DCDB-EFA4-420A-BB8A-71B9892A2063}
    HKEY_CLASSES_ROOT\Interface\{1E98666F-6260-42C9-B846-32B20fDEFE7B}
    HKEY_CLASSES_ROOT\Interface\{A5F6C90C-ABE4-4C57-A421-8C5A202AA9F8}
    HKEY_CLASSES_ROOT\Interface\{B13281CF-8778-4C98-AE23-ABBA4637A33D}

  4. Gathers email addresses from the Yahoo! Messenger and MSN Messenger contact lists.

  5. Mails itself as an attachment to the email addresess that it has gathered with one of the following subject and message body combinations:

    Subject: Hehehe LOL!!
    Message: I just saw this on my computer from a while ago <br>
    download it and see if you can remember ;) <br>
    lol i was lauging like crazy when i saw! :D <br>
    email me back hehe...

    Subject: Your Photo Is On A Webpage!!
    Message: I was veiwing this website and came across <br>
    a picture they look just like you! infact im sure <br>
    it is haha , did you email this pic into them ? or <br>
    is it someonce elses that looks like you :S ? pic is attached <br>
    in zip file so download it and see then email me back!

    Subject: Hey Rate My Pic Plz...
    Message: Hi ive sent out 4 emails now & nobody will rate <br>
    my photo! :( please download and tell me your opinion <br>
    rated out of 10 , its ok if you dont like it <br>
    just say i wont be offended p.s i was drunk when <br>
    it was taken haha :)

    Subject: Someone Admire's You!
    Message: Someone has asked us on there behalf to send <br>
    you this email and tell you they think you are <br>
    Amazing!! All the The secret persons details <br>
    you need are enclosed in the attachment :) <br>
    please download and respond telling us if you <br>
    would like to make further contact with this <br>
    person. <br><br>
    Regards Hallmark Admirer's Admin.

    Subject: Hey Hows It Goin ?
    Message: my name is turd i am 16 and poop on <br>
    trees after long walks in the park then i jump off <br>
    high buildings hahahahha rolf email me im lazy <br>
    and smell of manure

    Attachment:

    • Attachment.zip

      Attachment.zip contains one of the following files:

    • win32exe.exe
    • winlogons.exe
    • Just_For_You.pif
    • winis.exe
    • YourPic.scr
    • Lover_01.scr
    • Your_pic.scr

  6. Executes the file bx.exe, which is a copy of a W32.Spybot.Worm variant.

  7. Copies a variant of W32.Spybot.Worm as %System%\wini.exe.

    Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

  8. Adds the value:

    "xpstart" = "wini.exe"

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\OLE
    HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Control\Lsa

    so that the W32.Spybot.Worm variant runs every time Windows starts.

  9. Modifies the value:

    "EnableDCOM" = "N"

    in the registry subkey:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE

    to disable DCOM.
  10. Modifies the value:

    "restrictanonymous" = "1"

    in the registry subkey:

    HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Control\Lsa

    to restrict anonymous access to network shares.

  11. Contacts an IRC server at paris-hack.com:8080 for instructions.


Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.

Writeup By: Paul Mangan

Discovered: April 14, 2005
Updated: February 13, 2007 12:37:03 PM
Also Known As: Win32.Mugly.J [Computer Associ, Email-Worm.Win32.Wurmark.i [Ka, W32/Mugly.k@MM [McAfee], W32/Wurmark-I [Sophos]
Type: Worm
Systems Affected: Windows


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 asW32.Picrate.A@mm.
  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:
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.
  2. Run a full system scan.
  3. If any files are detected as infected with W32.Picrate.A@mm, click Delete.

    Note:
    If your Symantec antivirus product reports that it cannot delete an infected 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 section 4.

    Warning messages may be displayed when the computer is restarted, as the threat has not been fully removed at this point. Please ignore these messages and just 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.

  4. Navigate to the subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\
    RunServices
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\OLE
    HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Control\Lsa

  5. In the right pane, delete the value:

    "xpstart" = "wini.exe"

  6. Navigate to the subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\OLE
    HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Control\Lsa

  7. In the right pane, restore the values:

    "EnableDCOM" = "N"
    "restrictanonymous" = "1"

  8. Navigate to and delete the following subkeys:

    HKEY_CLASSES_ROOT\ANSMTP.OBJ.1
    HKEY_CLASSES_ROOT\ANSMTP.OBJ
    HKEY_CLASSES_ROOT\ANSMTP.MassSender.1
    HKEY_CLASSES_ROOT\ANSMTP.MassSender
    HKEY_CLASSES_ROOT\CLSID\{253664FB-EDFC-4AC6-BD69-B322F466AEED}
    HKEY_CLASSES_ROOT\CLSID\{887A577B-406B-48FF-80CB-70752BFCD7B4}
    HKEY_CLASSES_ROOT\Typelib\{DE6317F7-6EF0-45C2-88D1-8E09415817F1}
    HKEY_CLASSES_ROOT\Interface\{68B8DCDB-EFA4-420A-BB8A-71B9892A2063}
    HKEY_CLASSES_ROOT\Interface\{1E98666F-6260-42C9-B846-32B20fDEFE7B}
    HKEY_CLASSES_ROOT\Interface\{A5F6C90C-ABE4-4C57-A421-8C5A202AA9F8}
    HKEY_CLASSES_ROOT\Interface\{B13281CF-8778-4C98-AE23-ABBA4637A33D}

  9. Exit the Registry Editor.


Writeup By: Paul Mangan