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

• Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
• If a blended 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.
• 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.
• Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
• Isolate infected computers quickly to prevent further compromising your organization. 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.

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.
    

• "How to disable or enable Windows Me System Restore"
• "How to turn off or turn on Windows XP System Restore"

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:

• 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. 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.
   • For Norton AntiVirus consumer products: Read the document, "How to configure Norton AntiVirus to scan all files."
   • For Symantec AntiVirus Enterprise products: Read the document, "How to verify that a Symantec Corporate antivirus product is set to scan all 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.

Etc

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Last modified: March 12, 2019