W32.Paps.A@mm

Printer Friendly Page

Discovered: June 13, 2004
Updated: February 13, 2007 12:24:17 PM
Type: Worm
Systems Affected: Windows


W32.Paps.A@mm is a mass-mailing worm that sends itself as an attachment to the email addresses that it finds on your computer. The email will have a variable subject and file attachment. The attachment will have a .exe file extension.

This threat is written in the Delphi language and is packed by UPX.

Antivirus Protection Dates

  • Initial Rapid Release version June 13, 2004
  • Latest Rapid Release version March 03, 2008 revision 035
  • Initial Daily Certified version June 13, 2004
  • Latest Daily Certified version March 03, 2008 revision 037
  • Initial Weekly Certified release date June 13, 2004

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

Writeup By: Kaoru Hayashi

Discovered: June 13, 2004
Updated: February 13, 2007 12:24:17 PM
Type: Worm
Systems Affected: Windows


When W32.Paps.A@mm executes, it performs the following actions:

  1. Creates the following files:
    • %Windir%\Win32config.exe
    • %Windir%\Win32apps3.txt
    • %Windir%\Kernel32.dll
    • %Windir%\Ntbtlog.txt
    • iphist.dat. This file is created in the same folder as the original worm file.


      Note: %Windir% is a variable. The worm locates the Windows installation folder (by default, this is C:\Windows or C:\Winnt) and copies itself to that location.

  2. Adds the value:

    "Win32Config" = "%Windir%\win32config.exe"

    in the registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

    so that the worm is executed every time Windows starts.

  3. Scans the following file types on all the local drives for email addresses:

    .doc
    .txt
    .wab
    .rtf
    .htm
    .html
    .dbx
    .xml
    .msg
    .php
    .cgi
    .pst
    .nk2

  4. The worm sends itself to the addresses that it found as an email attachment. The contents of the email message varies depending on the top-level domain of the target email address.

    The worm does not send email to the addresses containing the following strings:

    VIRUS
    PESTPATROL
    KASPERSKY
    SOPHOS
    SYMANTEC
    NORTON
    AVP
    ANTIVIR
    FREEAV
    EWIDO
    F-SECURE
    MCAFEE
    NAI.COM
    BUSE@
    MICROSOFT

    • If the To address contains the top-level domains of .de, .at, or .ch, the email will be:

      Subject: The subject will be one of following:

      RE: RE: FWD:
      Re: Message Error
      Re: Ihre Informationen
      Re: Bad Request
      Anzeige wegen illegalem Mp3-Tausch
      du hast einen Trojaner auf deinem PC
      Du Idiot!!!
      ups, Ich habe Ihre Mail bekommen
      Ich hasse dich!!
      Achtung: Neuer Virus!!!
      MailerDaemon: Mail Delivery Failure

      Message: The message body will be one of the following:

      Hi du! Hab mal schnell ein paar Fotos mit Meikes Webcam geschossen. Sind echt lustig geworden :)
      Hab dir die Fotos angehngt! Wir sehen uns...

      ESMTP [Secure Mail System #334]: Secure message is attached.
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

      Guten Tag! Die angeforderten Informationen befinden sich im Anhang. MfG
      ++++ Attachment: No Virus found +++ Kaspersky AntiVirus - www.kaspersky.com

      Bad Gateway: The message has been attached.
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

      Sie tauschen illegal mp3-files aus! Ein Gerichtsverfahren gegen Sie wurde eingeleitet.
      Nhere Informationen entnehmen Sie bitte dem Anhang.

      Hallo, ich bin aus sterreich. Ich hab gerade mal kurz deinen Computer gescannt und festgestellt, das du einen Trojaner drauf hast. Ich konnte mir deine komplette Festplatte angucken.
      Ich hab dir mal nen Removal tool an die Mail angehngt. :)

      Warum machen sie das? Sie Idiot! Sie haben mein Geld gestolen!!!
      ICH WERDE SIE BEI DER POLIZEI ANZEIGEN!!!! Schauen Sie sich den Anhang an!

      Das muss wohl ein Fehllufer sein. Irgendjemand hat eine Mail, die fr Sie bestimmt war an meine Mail Adresse geschickt. Ich leite die Mail einfach mal weiter. Der Anhang ist sehr interessant :)

      Ich hab dir gesagt, das ich dich liebe...und du?? Du....du hast garnichts gesagt!!!
      Verschwinde...du Schuft ... Ich hasse dich!! Du kannst deine Dateien zurck haben!!! Ich hab sie angehngt...

      Achtung: An alle Online-Spieler!! Ein neuer Wurm verbreitet sich ber Online-Spiele!!!
      Installiert euch den Patch im Anhang so schnell wie mglich damit ihr das nicht auch kriegt!!

      Mail transaction failed. Partial message is available
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

    • If the To address does not contain the top-level domains of .de, .at, or .ch, the email properties will be:

      Subject: The subject will be one of following:

      RE: RE: FWD:
      Re: Message Error
      Re: Mail Authentification
      Re: Bad Request
      illegal file sharing
      a trojan horse is on your PC
      you are an idiot
      ups, i've got your mail
      I hate you
      hi, its me
      MailerDaemon: Mail Delivery Failure

      Message: The message body will be one of the following:

      Here, the DigiCam photos. A few are overexposed...

      ESMTP [Secure Mail System #334]: Secure message is attached.
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

      Please read the attachment to get the message.
      ++++ Attachment: No Virus found +++ Kaspersky AntiVirus - www.kaspersky.com

      Bad Gateway: The message has been attached.
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

      You are sharing illegal mp3-files. A legal investigation has been startet. For details read the attachment.

      hi, I am from austria and you`ll don`t believe me, but a trojan horse in on your PC.
      I've scanned your Computer and discovered that the trojan horse subseven is running on Port 1234. I have
      attached a removal tool for you to this mail :)

      why did you do that? idiot! You stole my money!!! I`LL REPORT YOU TO THE POLICE!!!! See the attachment!

      i`m very very sorry, but anybody have sent your mail to my address. The attachment is very surprising :)

      I said, I love you...and you said NOTHING And now... Go Away From Me ... I hate you!!
      You can have your documents back!! I`ve attached them...

      Caution: To all gamers A new worm spread via online gaming! Install the attached patch as soon as possible!!

      Mail transaction failed. Partial message is available
      ++++ Attachment: No Virus found ++++ Norton AntiVirus - www.symantec.com

    • In all the cases, the file name of the attachment will be one of the following:

      Pics.JPG.exe
      MailMessage.Msg.exe
      Filesharing_details.DOC.exe
      Trojan_removal_tool.exe
      Report.DOC.exe
      Documents.DOC.exe
      Removal_tool.exe

  5. Attempts to access the following Web sites:

    http: //www.google.de
    http: //www.hausaufgaben.de
    http: //www.referate.de
    http: //www.eselfilme.com

  6. Attempts to access http: //www.whatismyip.com to get the IP address of the local system.


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: Kaoru Hayashi

Discovered: June 13, 2004
Updated: February 13, 2007 12:24:17 PM
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.Paps.A@mm.
  4. Delete the value that was 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 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.Paps.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, you can leave the computer in Safe mode and proceed with section 4. When that is done, restart the computer in Normal mode.)


4. To delete the value from the registry


WARNING: 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. (The Run dialog box appears.)
  2. Type regedit

    Then click OK. (The Registry Editor opens.)

  3. Navigate to the key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

  4. In the right pane, delete the value:

    "Win32Config" = "%Windir%\win32config.exe"

  5. Exit the Registry Editor.


Writeup By: Kaoru Hayashi