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Discovered: April 25, 2005
Updated: February 13, 2007 12:37:19 PM
Also Known As: Win32.Antiman.{A, B, C} [Computer Associates], Email-Worm.Win32.Antiman.{a, b, c} [Kaspersky Lab], W32/Antiman@MM [McAfee], W32/Antiman-{A, B, D} [Sophos], WORM_ANTIMAN.{A, B, D} [Trend Micro]
Type: Worm
Systems Affected: Windows

W32.Antiman.A@mm is a mass-mailing worm that uses its own SMTP engine to send a copy of itself to all email addresses that it finds on the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version April 26, 2005
  • Latest Rapid Release version April 15, 2018 revision 037
  • Initial Daily Certified version April 26, 2005
  • Latest Daily Certified version April 16, 2018 revision 001
  • Initial Weekly Certified release date April 27, 2005

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

Writeup By: Yana Liu

Discovered: April 25, 2005
Updated: February 13, 2007 12:37:19 PM
Also Known As: Win32.Antiman.{A, B, C} [Computer Associates], Email-Worm.Win32.Antiman.{a, b, c} [Kaspersky Lab], W32/Antiman@MM [McAfee], W32/Antiman-{A, B, D} [Sophos], WORM_ANTIMAN.{A, B, D} [Trend Micro]
Type: Worm
Systems Affected: Windows

W32.Antiman.A@mm usually arrives as an email attachment.

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

  1. Copies itself as %Windir%\funny.scr.

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

  2. Queries the following registry subkey to find the start menu folder:

    \Explorer\Shell Folders\Start Menu

  3. Copies itself to the start menu folder as startwin.exe. For example, the worm may copy itself as:

    %UserProfile%\Start Menu\Programs\Startup\startwin.exe

    Note: %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\<Current User> (Windows NT/2000/XP).

  4. Creates the text file c:\m.txt.

  5. Adds the values:

    "SCRNSAVE.EXE" = "%Windir%\funny.scr"
    "ScreenSaveTimeOut" = "300"

    to the registry subkey:

    HKEY_CURRENT_USER\Control Panel\Desktop

  6. Retrieves email addresses from the Microsoft Outlook deleted Items, inbox, and outbox folders.

  7. Retrieves email addresses from Yahoo Instant Messenger log files.

  8. Uses its own SMTP engine to send itself to all the email addresses it finds. It uses the default SMTP server of the compromised computer or one of the following:

    • mx1.pcnet.ro
    • smtp.dnt.ro
    • scentra.dntcj.ro
    • relay-1.dntis.ro
    • mail.easynet.ro
    • relay1.romania.eu.net
    • mail-relay.eu.net
    • smtp.fx.ro
    • ns.matco.ro
    • mail.mailbox.ro
    • mx.kappa.ro
    • mx2.kappa.ro
    • mail.rdsnet.ro
    • mail.rdslink.ro
    • tag.starnets.ro
    • mail.totalnet.ro
    • relay.totalnet.ro
    • mail.xnet.ro
    • mail.remote.xnet.ro
    • mail.remote1.xnet.ro
    • mail.iasi.rdsnet.ro
    • mail.pcnet.ro
    • smtp.xnet.ro
    • smtp.home.ro
    • mail.home.ro
    • relay.n0i.net
    • omega.tuiasi.ro
    • hal.cs.tuiasi.ro

      The email will be one of the following:

      Subject: Poza de la mare
      Message Body: Ti-am trimis ultima poza de la mare. Asta e?
      Attachment: scan_picture_0001._JPG.exe

      Subject: Antivirus
      Message Body: Asta e ultimul antivirus. Ar trebui sa rezolve toate problemele.
      Attachment: antivirus.exe

      Sex in camin
      Message Body: Ioana, sex in grup in camin. Cred ca o stii si tu ;)
      Attachment: ioana_divx._AVI.exe

      Subject: Faza cu camila
      Message Body: :)))))))
      Attachment: camila.exe

      Subject: De ce mor mai repede curiosii...
      Message Body: Nu deschide acest mesaj! E numai pentru persoanele prea curioase!
      Attachment: curiosii.exe

      Subject: Antimanele
      Message Body:
      Daca sunteti nu mai suportati manelele la servici, tramvai, taxi, metrou, etc., trimiteti acest mesaj la toti prietenii dvs. !
      Va multumesc (din suflet).
      Attachment: antimanele.exe

      Subject: Votati astazi!
      Message Body:
      Credeti ca ar fi mai bine ca Romania sa-si retraga trupele din Irak anul acesta?
      Deschideti programul Vot, alegeti votul dvs. si vedeti rezultatele.
      Parerea dvs. conteaza!
      Attachment: vot_[current date].exe

      Subject: Cu sau fara Manele ?
      Message Body:
      Credeti ca ar fi mai bine ca manelele sa fie interzise in Romania?
      Deschideti programul de votare, alegeti votul dvs. si vedeti rezultatele.
      Parerea dvs. conteaza!
      Attachment: vot_manele_[current date].exe

      Subject: Pentru Ionel
      Message Body:
      Draga Ionel
      Scuza-ma ca nu ti-am mai scris de mult timp, dar am avut ceva probleme cu calculatorul
      Ti-am promis ultima data pe chat o poza cu mine dezbracata... m-am gandit mult la asta si cred ca pana la urma cel mai bine e sa-ti trimit o poza.
      Sper sa-ti placa. Daca nu o sa-mi mai scrii dupa mesajul asta, o sa te inteleg...
      [current date]
      Attachment: poza_roxana._JPG.exe

      Subject: Cum a murit Papa?
      Message Body:
      Film cu moartea papei. Toate drepturile rezervate. Este interzisa modificarea continutului. Poate fi redistribuit.
      Asociatia Catolicilor Anonimi din Romania.
      Attachment: film_papa._avi._divx_.exe


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: April 25, 2005
Updated: February 13, 2007 12:37:19 PM
Also Known As: Win32.Antiman.{A, B, C} [Computer Associates], Email-Worm.Win32.Antiman.{a, b, c} [Kaspersky Lab], W32/Antiman@MM [McAfee], W32/Antiman-{A, B, D} [Sophos], WORM_ANTIMAN.{A, B, D} [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 as W32.Antiman.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:
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.Antiman.A@mm, click Delete.

    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 subkey:

    HKEY_CURRENT_USER\Control Panel\Desktop

  5. In the right pane, delete the values:

    "SCRNSAVE.EXE" = "%Windir%\funny.scr"
    "ScreenSaveTimeOut" = "300"

  6. Exit the Registry Editor.

Writeup By: Yana Liu