1. Symantec/
  2. Security Response/
  3. W32.Neeris


Risk Level 1: Very Low

September 12, 2007
September 12, 2007 11:09:33 AM
Also Known As:
Infection Length:
25,600 bytes
Systems Affected:
When the worm executes, it creates the following file:

Next, the worm creates the following registry entry so that it executes whenever Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Windows Lsass Services" = "%Windir%\system\lsass.exe"

The worm then modifies the following registry entry in order to add itself to the list of authorized applications for the Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List\"Default" = ":*:Enabled:Windows Sharing"

It also modifies the following registry entries:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Shell Extensions\"MSNPRC" = "[PATH TO WORM EXECUTABLE]"
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\"WaitToKillServiceTimeout" = "7000"

The worm then checks to see if Microsoft instant messaging clients are running (such as Windows Live Messenger, MSN Messenger, and Windows Messenger). If it is, the worm sends one of the following messages to all contacts listed in the client:
  • hT je vais mettre cette image de nous sur mon myspace :>
  • le lol se rappellent quand vous aviez l'habitude d'avoir vos cheveux comme ceci
  • hT veux tu voir mes image de vacance??
  • j'ai fais pour toi ce photo album tu dois le voire :p
  • haha vous devriez rendre ceci votre dTfaut pic sur le myspace ou quelque chose :D
  • mes photos chaudes :D
  • dTfaut de la reproduction sonore ! regard a cette vieille image que j'ai trouvTe : |

  • ehi metter= quest'immagine di noi sul mio myspace :>
  • jaja ricordo quando lei aveva i suoi capelli come questo
  • ehi aggiunger= quest'immagine di noi al mio weblog
  • jaja lei dovrebbe fare quest'il suo pic predefinito sul myspace o qualcosa :Dmetta questi fotos in suo pagina myspace
  • Qui sono il fotos di ci
  • Caricher= questa foto al mio myspace adesso
  • Io ricordo quando abbiamo portato questa foto
  • Per favore nessuno lasciare vede le nostre foto

  • he werde ich diese Abbildung von uns auf mein myspace setzen
  • lol erinnern sich, an als Sie pflegten, Ihr Haar so zu haben
  • he werde ich diese Abbildung von uns meinem weblog hinzufngen
  • Haha sollten Sie dieses Ihre Rnckstellung auf myspace oder etwas pic bilden:D
  • he ich zeige Ihnen diese Abbildung von mir nberhaupt?
  • Wimmern! Blick auf diese alte Abbildung, die ich: fand
  • m?hten den pics von meinen Ferien sehen?

  • Here are my private pictures for you
  • hey i'm going to add this picture of us to my weblog
  • My friend took nice photos of me.you Should see em loL!
  • lol remember when you used to have your hair like this
  • Nice new photos of me and my friends and stuff and when i was young lol...
  • wanna see the pics from my vacation? :>
  • Check out my nice photo album. :D

  • Hey i zet deze foto van ons even op mijn myspace
  • lol ik kan me nog herrinneren toen je haar zoals dit had
  • hey ik voeg deze foto van ons ff toe op mijn weblog
  • haha you moet die je standaard foto maken op hyves of myspace
  • he heb je ooit deze foto laten zien ?
  • wow! moet je eens kijken welke foto ik nu gevonden heb
  • wil je fotos zien van mijn vakantie

  • oye voy a poner esa foto de nosotros en mi myspace :->
  • jaja recuerda cuando tuviste el pelo asi
  • oye voy a agregar esa foto a mi blog ya
  • jaja debes poner esa foto como foto principal en tu myspace o algo :D
  • hola esas son las fotos
  • esa foto de tu y yo la voy a poner en myspace
  • voy a poner esa foto de nosotros en mi blog ya
  • oye ponga esa foto en tu myspace como la foto principal
  • jajaja yo me recuerdo cuando tuvistes el pelo asi
  • ay no ese pelo fue lo mas chistoso...q estabas pensando

It also sends a copy of itself as the following file with the above message:

The above file is then saved to the following location on the compromised computer:

The worm then opens a back door on the compromised computer that allows a remote attacker to perform the following actions:
  • Show server list
  • Change server
  • Create processes
  • List processes
  • List threads
  • End processes
  • Update itself
  • Download and execute potentially malicious files
  • Show login list
  • Show Bot Version
  • Steal sensitive information (Computer name, OS version etc.)
  • Show the worm status


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: Hiroshi Shinotsuka
Summary| Technical Details| Removal

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