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Contents Bulletin Scripting in shell and Perl Network troubleshooting History Humor

Malware Defense History

by Dr. Nikolai Bezroukov.

Copyright: Dr. Nikolai Bezroukov 1994-2013. Unpublished notes. Version 0.80.October, 2013

Contents : Foreword : Ch01 : Ch02 : Ch03  : Ch04 : Ch05 : Ch06 : Ch07 : Ch08 : Ch09 : Ch10 : Ch11 : Ch12 : Ch13


Chapter 6: Mail Worms

Netsky Worm

Discovered on: February 18, 2004

Netsky.B is a mass-mailing worm that uses its own SMTP engine to send itself to email addresses it finds when scanning the hard drives and mapped drives. the author is the same as Sasser worm.  It also searches drives C through Z for folder names containing "Share" or "Sharing," and then copies itself to those folders.

The Subject, Body, and email attachment vary.


  • When W32.Netsky@mm runs, it does the following:
     

    1. Creates a mutex named "AdmSkynetJKIS003." This mutex allows only one instance of the worm to execute in memory.

       
    2. Displays a dialog box with the text:

      The file could not be opened!

       
    3. Copies itself as %Windir%\services.exe.
       

      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.


       

    4. Creates .zip files in the %Windir% folder, which contain copies of the worm.

       
    5. Adds the value:

      "service" = "%Windir%\services.exe -serv"

      to the registry key:

      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

      so that the worm runs when you start Windows.

       
    6. Deletes the values:
       
      • "Taskmon"
      • "Explorer"

        from the registry keys:
         
      • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
      • HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices

         
    7. Deletes the values:
       
      • "KasperskyAV"
      • "System."

        from the registry key:

        HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run

         
    8. Deletes the registry key:

      HKEY_CLASSES_ROOT\CLSID\{E6FB5E20-DE35-11CF-9C87-00AA005127ED}\InProcServer32

       
    9. Retrieves email addresses from the files with the following file extensions:
       
      • .msg
      • .oft
      • .sht
      • .dbx
      • .tbb
      • .adb
      • .doc
      • .wab
      • .asp
      • .uin
      • .rtf
      • .vbs
      • .html
      • .htm
      • .pl
      • .php
      • .txt
      • .eml
         
    10. Searches drives C through Z for folder names containing the words "Share" or "Sharing." If the drive is not a CD-ROM, the worm copies itself as the following:
       
      • doom2.doc.pif
      • sex sex sex sex.doc.exe
      • rfc compilation.doc.exe
      • dictionary.doc.exe
      • win longhorn.doc.exe
      • e.book.doc.exe
      • programming basics.doc.exe
      • how to hack.doc.exe
      • max payne 2.crack.exe
      • e-book.archive.doc.exe
      • virii.scr
      • nero.7.exe
      • eminem - lick my pussy.mp3.pif
      • cool screensaver.scr
      • serial.txt.exe
      • office_crack.exe
      • hardcore porn.jpg.exe
      • angels.pif
      • porno.scr
      • matrix.scr
      • photoshop 9 crack.exe
      • strippoker.exe
      • dolly_buster.jpg.pif
      • winxp_crack.exe

         
    11. Uses its own SMTP engine to send itself to email addresses it found in step nine.

      The email has the following characteristics:

      From: (Spoofed)

      Subject: (One of the following)
       
      • hi
      • hello
      • read it immediately
      • something for you
      • warning
      • information
      • stolen
      • fake
      • unknown

        Message: (One of the following)
         
      • anything ok?
      • what does it mean?
      • ok
      • i'm waiting
      • read the details.
      • here is the document.
      • read it immediately!
      • my hero
      • here
      • is that true?
      • is that your name?
      • is that your account?
      • i wait for a reply!
      • is that from you?
      • you are a bad writer
      • I have your password!
      • something about you!
      • kill the writer of this document!
      • i hope it is not true!
      • your name is wrong
      • i found this document about you
      • yes, really?
      • that is bad
      • here it is
      • see you
      • greetings
      • stuff about you?
      • something is going wrong!
      • information about you
      • about me
      • from the chatter
      • here, the serials
      • here, the introduction
      • here, the cheats
      • that's funny
      • do you?
      • reply
      • take it easy
      • why?
      • thats wrong
      • misc
      • you earn money
      • you feel the same
      • you try to steal
      • you are bad
      • something is going wrong
      • something is fool

        Attachment Name: (One of the following)
         
      • document
      • msg
      • doc
      • talk
      • message
      • creditcard
      • details
      • attachment
      • me
      • stuff
      • posting
      • textfile
      • concert
      • information
      • note
      • bill
      • swimmingpool
      • product
      • topseller
      • ps
      • shower
      • aboutyou
      • nomoney
      • found
      • story
      • mails
      • website
      • friend
      • jokes
      • location
      • final
      • release
      • dinner
      • ranking
      • object
      • mail2
      • part2
      • disco
      • party
      • misc
      • me

        Attachment Extension: (One of the following)
         
      • .exe
      • .scr
      • .com
      • .pif

    Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":



    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.Netsky.B@mm.
    4. Delete the value that was added to the registry.
       

    For specific details on each of these steps, read the following instructions.

    1. Disabling 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 you are satisfied that the threat has been removed, you should 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. Updating 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:


    3. Scanning for and deleting 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.Netsky.B@mm, click Delete.


    4. Deleting 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, and then click 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:

      "service" = "%Windir%\services.exe -serv"

       
    5. Exit the Registry Editor.




     


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