W32.Reatle@mm

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Discovered: July 15, 2005
Updated: February 13, 2007 12:42:16 PM
Also Known As: CME-875, Win32.Reatle.A [Computer Assoc, Lebreat [F-Secure], Net-Worm.Win32.Lebreat.gen [Ka, W32/Reatle.gen@MM [McAfee], W32/Lebreat-A [Sophos], WORM_REATLE.A [Trend Micro]
Type: Worm
Systems Affected: Windows



W32.Reatle@mm is a mass-mailing worm that opens a back door and attempts to propagate by exploiting the Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011 ) on TCP port 445.

Antivirus Protection Dates

  • Initial Rapid Release version July 15, 2005
  • Latest Rapid Release version January 21, 2018 revision 022
  • Initial Daily Certified version July 15, 2005
  • Latest Daily Certified version January 22, 2018 revision 002
  • Initial Weekly Certified release date July 15, 2005

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

Writeup By: Candid Wueest

Discovered: July 15, 2005
Updated: February 13, 2007 12:42:16 PM
Also Known As: CME-875, Win32.Reatle.A [Computer Assoc, Lebreat [F-Secure], Net-Worm.Win32.Lebreat.gen [Ka, W32/Reatle.gen@MM [McAfee], W32/Lebreat-A [Sophos], WORM_REATLE.A [Trend Micro]
Type: Worm
Systems Affected: Windows


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

  1. May copy itself as the following files:

    • %System%\ccapp.exe
    • %System%\Windows.exe
    • %System%\attach.tmp

      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).

  2. Adds the value:

    "Symantec"= "C:\WINNT\System32\ccapp.exe"

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows

    so that it runs every time Windows starts.

  3. Adds the value:

    "WIN"= "C:\WINNT\System32\windows.exe"

    to the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows

    so that it runs every time Windows starts.

  4. Downloads and executes the following file, which is a copy of W32.Rants.B@mm:

    [http://]j0r.biz/[removed]/update3.exe

  5. Modifies the value:

    "EnableFirewall" = "1"

    in the registry subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\
    DomainProfile
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsFirewall\
    StandardProfile
    HKEY_CURRENT_USER\Software\Policies\Microsoft\WindowsFirewall\
    DomainProfile
    HKEY_CURRENT_USER\Software\Policies\Microsoft\WindowsFirewall\
    StandardProfile

    so that it disables several Windows security features.

  6. Modifies the values:

    "NoAutoUpdate" = "1"
    "AUOptions" = "1"

    in the registry subkeys:

    HKEY_CURRENT_USER\Software\Policies\Microsoft\WindowsWindowsUpdate\AU
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\WindowsWindowsUpdate\AU

    so that it disables several Windows security features.

  7. Modifies the values:

    "AntiVirusDisableNotify" = "0"
    "UpdatesDisableNotify" = "0"
    "FirewallDisableNotify" = "0"

    in the registry subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Security Center
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center

    so that it disables several Windows security features.

  8. Modifies the value:

    "DisableSR" = "1"

    in the registry subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\
    SystemRestore
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
    SystemRestore

    so that it disables System Restore.

  9. Modifies the values:

    "DisableTaskMgr" = "1"
    "DisableRegistryTools" = "1"

    in the registry subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\
    Policies\System
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    Policies\System

    so that it disables Task Manager and Registry Tools.

  10. Gathers email addresses from files with the following extensions:

    • .asp
    • .txt
    • .adb
    • .tbb
    • .dbx
    • .html
    • .htm
    • .wab

  11. Stores the gathered email addresses in the file %Windir%\xzy6.tmp.

    Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.

  12. Avoids sending itself to email addresses that contain any of the following strings:

    • icrosof
    • .gov
    • panda
    • f-secur
    • icrosoft
    • winrar
    • winzip
    • @mcafee
    • @trendmicro
    • @mm
    • @noreply
    • @sopho
    • @norman
    • @virusli
    • @norton
    • @fsecure
    • @panda
    • @avp
    • @microsoft
    • @symantec

  13. Uses its own SMTP engine to send itself to the email addresses that it finds. The email has the following characteristics:

    From:
    One of the following:

    • adam
    • admin
    • alerts
    • alex
    • bob
    • brenda
    • brent
    • dan
    • david
    • fred
    • helen
    • jack
    • jane
    • jerry
    • joe
    • john
    • jon
    • josh
    • leo
    • linda
    • mary
    • matt
    • michael
    • mike
    • paul
    • ray
    • robert
    • root
    • sales
    • steve
    • support
    • ted
    • tom

      The name is followed by one of these domains:

    • @nai.com
    • @gmail.com
    • @trendmicro.com
    • @support.com
    • @matrix.com
    • @aol.com
    • @ca.com
    • @mcafee.com
    • @arcor.com
    • @antivirus.com
    • @google.com
    • @hotmail.com
    • @yahoo.com
    • @microsoft.com
    • @msn.com
    • @symantec.com

      Subject:
      One of the following:

    • Message could not be delivered
    • Bug
    • Error
    • Email
    • Mail Delivery System
    • Importnat Information
    • **WARNING** Your Account Currently Disabled.
    • Password
    • info
    • Hello

      Message Body:
      One of the following:

    • Your credit card was charged for $500 USD. For additional information see the attachment.
    • Binary message is available.
    • The message contains Unicode characters and has been sent as a binary attachment.
    • Here are your banks documents
    • The original message was included as an attachment.
    • We have temporarily suspended your email account checkout the attachment for more info.
    • You have successfully updated the password of your domain account checkout the attachment for more info.
    • Important Notification checkout the attachment for more info.
    • Your Account Suspended checkout the document.
    • Your password has been updated checkout the document.
      checkout the attachment.
    • Hello,
      I was in a hurry and I forgot to attach an important
      document. Please see attached.

      Attachment:
      One of the following:

    • payment.doc [SPACES] .scr
    • about.doc [SPACES] .bat
    • help.doc [SPACES] .exe
    • account-report.exe
    • about.cpl
    • about.scr
    • admin.bat
    • archive.cpl
    • archive.exe
    • box.bat
    • box.scr
    • data.bat
    • data.scr
    • doc.pif
    • docs.cpl
    • docs.scr
    • document.cpl
    • document.exe
    • file.cpl
    • inbox.cpl
    • inbox.exe
    • order.cpl
    • order.exe
    • read.cpl
    • read.exe
    • readme.cpl
    • readme.scr

  14. Opens an FTP server on TCP port 8885.

  15. Attempts to connect to a random range of IP addresses on TCP port 445 by using the Microsoft Windows Local Security Authority Service Remote Buffer Overflow (as described in Microsoft Security Bulletin MS04-011).

  16. Downloads itself onto the newly compromised computer, if a successful connection is made.

  17. Attempts to perform denial of service attacks against www.symantec.com through port 1052 with randomly generated packets.

    Note: Port 1052 corresponds to dynamic DNS service.


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: Candid Wueest

Discovered: July 15, 2005
Updated: February 13, 2007 12:42:16 PM
Also Known As: CME-875, Win32.Reatle.A [Computer Assoc, Lebreat [F-Secure], Net-Worm.Win32.Lebreat.gen [Ka, W32/Reatle.gen@MM [McAfee], W32/Lebreat-A [Sophos], WORM_REATLE.A [Trend Micro]
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.
  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 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 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, click Delete.
  4. Delete the %Windir%\xzy6.tmp file, if it is not needed. If you are unsure about this, you can leave this file without causing any further harm to the computer.

Important: If you are unable to start your Symantec antivirus product or the product reports that it cannot delete a detected file, you may need to stop the risk from running in order to remove it. To do 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 subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows

  5. In the right pane, delete the values:

    "Symantec"= "C:\WINNT\System32\ccapp.exe"
    "WIN"= "C:\WINNT\System32\windows.exe"

  6. Navigate to the subkeys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\
    WindowsFirewall\DomainProfile
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\
    WindowsFirewall\StandardProfile

  7. In the right pane, reset the value to the original value if applicapble:

    "EnableFirewall" = "1"

  8. Navigate to the subkeys:

    HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\WindowsUpdate\AU
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

  9. In the right pane, reset the value to the original value if applicapble:

    "NoAutoUpdate" = "1"

  10. Navigate to the subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Security Center
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center

  11. In the right pane, reset the values to the original values if applicapble:

    "AntiVirusDisableNotify" = "0"
    "UpdatesDisableNotify" = "0"
    "FirewallDisableNotify" = "0"

  12. Navigate to the subkeys:

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore

  13. In the right pane, reset the value to the original value if applicapble:

    "DisableSR" = "1"

  14. Navigate to the subkeys:

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

  15. In the right pane, reset the values to the original values if applicapble:

    "DisableTaskMgr" = "1"
    "DisableRegistryTools" = "1"

  16. Exit the Registry Editor.


Writeup By: Candid Wueest