Discovered: August 03, 2004
Updated: February 13, 2007 12:25:58 PM
Also Known As: WORM_MYDOOM.O [Trend Micro], W32/Mydoom.q@MM [McAfee], W32/MyDoom-Q [Sophos], I-Worm.Mydoom.o [Kaspersky], W32/Mydoom.P.worm [Panda]
Type: Worm
Systems Affected: Windows


W32.Evaman.C@mm is a mass-mailing worm that sends HTTP Get requests to the Web site, email.people.yahoo.com, to obtain email addresses. It also retrieves the email addresses from Windows Address Book files and from the files with the extensions .adb, .asp, .cfg, .dbx, .dhtm, .eml, .htm, .html, .jse, .jsp, .mmf, .msg, .ods, .php, .pl, .sht, .shtm, .shtml, .tbb, .txt, .wab, and .xml.

W32.Evaman.C@mm uses its own SMTP engine to send itself to the email addresses that it finds.

The email will have one of these subjects:

  • SN: New secure mail
  • Secure delivery
  • failed transaction
  • Re: hello (Secure-Mail)
  • Re: Extended Mail
  • Delivery Status (Secure)
  • Re: Server Reply
  • SN: Server Status

This threat is compressed with UPX.


Antivirus Protection Dates

  • Initial Rapid Release version August 04, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version August 04, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date August 04, 2004

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

Writeup By: Yana Liu

Discovered: August 03, 2004
Updated: February 13, 2007 12:25:58 PM
Also Known As: WORM_MYDOOM.O [Trend Micro], W32/Mydoom.q@MM [McAfee], W32/MyDoom-Q [Sophos], I-Worm.Mydoom.o [Kaspersky], W32/Mydoom.P.worm [Panda]
Type: Worm
Systems Affected: Windows


When W32.Evaman.C@mm runs, it does the following:

  1. May create a mutex "Northernlightmixed," which allows only one instance of the worm to run in memory.

  2. Launches Notepad.exe.

  3. Copies itself as one of the following:
    • %System%\winlibs.exe
    • %Temp%\winlibs.exe

      Notes:
      %System% is a variable. The worm locates the System folder and copies itself to that location. By default, this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).

      %Temp% is a variable.

  4. Creates one of the following registry keys, which the worm uses as an infection marker:

    HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\winlibs

    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\winlibs

  5. Adds the value:

    "winlibs.exe" = "%System%\winlibs.exe"

    to one of these registry keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run

    so that the worm runs when you start Windows.

  6. Terminates the process if any of its module base names contain one of the following:
    • uba
    • mc
    • Mc
    • av
    • AV
    • cc
    • sym
    • Sym
    • nv
    • can
    • scn
    • java
    • xp.exe
    • ecur
    • nti
    • erve
    • sss
    • iru
    • ort
    • SkyNet
    • KV

  7. Attempts to log off the current user, shut down the system, or shut down and restart the system, if the current system time is later than January 1, 2006.

  8. Sends random HTTP Get requests to the Web site, email.people.yahoo.com:80, to retrieve the email addresses.

  9. Retrieves the email addresses from WAB files.

  10. Retrieves the email addresses from the files with the extensions .adb, .asp, .cfg, .dbx, .dhtm, .eml, .htm, .html, .jse, .jsp, .mmf, .msg, .ods, .php, .pl, .sht, .shtm, .shtml, .tbb, .txt, .wab, or .xml on the folders:

    %Windir%\Temporary Internet Files
    %USERPROFILE%\Local Settings\Temporary Internet Files
    %System% folder on all fixed and RAM drives from C through Y

  11. Uses its own SMTP engine to send itself to the addresses that it finds.

    The email has the following characteristics:

    From: This is spoofed. The sender name may be one of the following:
    • mike
    • jennifer
    • david
    • linda
    • susan
    • nancy
    • pamela
    • eric
    • kevin
    • mary
    • jessica
    • patricia
    • barbara
    • karen
    • sarah
    • robert
    • john
    • daniel
    • jason
    • joe

      The domain name will be the recipient's domain name.
    Subject: The subject is one of the following:
    • SN: New secure mail
    • Secure delivery
    • failed transaction
    • Re: hello (Secure-Mail)
    • Re: Extended Mail
    • Delivery Status (Secure)
    • Re: Server Reply
    • SN: Server Status

    Attachment: This is composed of one of the following strings:
    • mail
    • message
    • attachment
    • transcript
    • text
    • document
    • file
    • readme

    followed by one of the following:
    • .exe
    • -txt.exe
    • -htm.exe
    • -txt.scr
    • zip

    Message: The message is in the format:

    <recipient domain name> :: <part 1><recipient email address>.

    <part 2>

    <part3><recipient domain name>.


    where:

    <part 1> is one of the following:
    • Automatically Secure Delivery: for
    • Mail Delivery Server System: for
    • Extended secure mail message available at:
    • Secure Mail Server Notification: for
    • New mail secure method implement: for
    <part 2> is one of the following:
    • New policy requested by mail server to returned mail
      as a secure compiled attachment (Zip).
    • Now a new message is available as secure Zip file format.
      Due to new policies on clients.
    • This message is available as a secure Zip file format
      due to a new security policy.
    • For security measures this message has been packed as Zip format.
      This is a newly added security feature.
    • New policy recommends to enclose all messages as Zip format.
      Your message is available in this server notice.
    • You have received a message that implements secure delivery technology.
      Message available as a secure Zip file.
    <part 3> is one of the following:
    • This message is an automatically server notice
      from Administration at
    • Server Notice: New security feature added. MSG:ID: 455sec86
      from
    • New feature added for security reasons
      from
    • Automatically server notice:,
      Server reply from
    • New service policy for security added from


    The worm does not send itself to the email addresses that contain any of the following:
    • .edu
    • Bug
    • ugs
    • bug
    • upport
    • ICROSOFT
    • icrosoft
    • oot
    • dmin
    • ymant
    • avp
    • ecur
    • @MM
    • ebmast
    • help
    • opho
    • inpris
    • omain
    • senet
    • panda
    • 32.
    • @mm
    • msn
    • inux
    • umit
    • nfo
    • irus
    • buse
    • orton
    • cafee
    • spam
    • Spam
    • SPAM
    • ntivi
    • eport
    • user
    • inzip
    • inrar
    • rend
    • pdate
    • USER
    • ating
    • ample
    • ists
    • persk
    • ccoun
    • ompu
    • msdn
    • YOU
    • you
    • oogle
    • arsoft
    • otmail
    • sarc
    • soft
    • ware
    • .gov
    • .mil
    • cribe
    • list
    • eturn
    • omment
    • Sale
    • sale
    • CRIBE
    • gmail
    • ruslis
    • ibm
    • win


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: Yana Liu

Discovered: August 03, 2004
Updated: February 13, 2007 12:25:58 PM
Also Known As: WORM_MYDOOM.O [Trend Micro], W32/Mydoom.q@MM [McAfee], W32/MyDoom-Q [Sophos], I-Worm.Mydoom.o [Kaspersky], W32/Mydoom.P.worm [Panda]
Type: Worm
Systems Affected: Windows


Removal using the W32Evaman.C@mm Removal Tool
Symantec Security Response has developed a removal tool to clean the infections of W32.Evaman.C@mm. Use this removal tool first, as it is the easiest way to remove this threat.

Manual Removal
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. Restart the computer in Safe mode or VGA mode.
  4. Run a full system scan and delete all the files detected as W32.Evaman.C@mm.
  5. Delete the values that were 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, re-enable 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 Virus Definitions (LiveUpdate).
  • Downloading the definitions using the Intelligent Updater: The Intelligent Updater virus definitions are posted on U.S. business days (Monday through Friday). 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 Virus Definitions (Intelligent Updater).

    The Intelligent Updater virus definitions are available: Read "How to update virus definition files using the Intelligent Updater" for detailed instructions.

3. To restart the computer in Safe mode or VGA mode
Shut down the computer and turn off the power. Wait for at least 30 seconds, and then restart the computer in Safe mode or VGA mode.
  • For Windows 95, 98, Me, 2000, or XP users, restart the computer in Safe mode. For instructions, read the document, "How to start the computer in Safe Mode."
  • For Windows NT 4 users, restart the computer in VGA mode.

4. 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.Evaman.C@mm, click Delete.


5. To delete the values 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 keys only. Read the document, "How to make a backup of the Windows registry ," for instructions.
  1. Click Start > Run.
  2. Type regedit

    Then click OK.

  3. Navigate to each of the following keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value if it exists:

    "Winlibs.exe"="%System%\Winlibs.exe"

  5. Navigate to and delete the keys:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
    Explorer\Winlibs

    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\
    Explorer\Winlibs

  6. Exit the Registry Editor.

  7. Restart the computer in Normal mode.


Writeup By: Yana Liu