W32.Mydoom.BO@mm

1. Copies itself as %System%\1hellbot.exe.
   
   Note: %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
   
   
2. Adds the value:
   
   "HELLBOT TEST" = "1hellbot.exe"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\
   RunServices
   
   so that the threat runs every time Windows starts.
   
   
3. Creates the mutex named "H-e-l-l-B-o-t-3-!!!", so that only one instance of the threat runs on the compromised computer
   
   
4. Opens a back door by connecting to an IRC channel on the blackcarder.net domain using TCP port 6677. This allows the remote attacker to perform any of the following actions:
   
   
   • Download and execute files.
   • Perform other IRC commands determined by the attacker.
   • Reboot the compromised computer.
     
     
5. Retrieves email addresses from the Windows Address Book and from the following locations:
   
   
   • %Windir%\Temporary Internet Files
   • %UserProfile%\Local Settings\Temporary Internet Files
   • %System%
     
     Note:
     %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows (Windows 95/98/Me/XP) or C:\Winnt (Windows NT/2000).
     %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).
     
     The worm also searches all local drives from C to Y for email addresses in files that have the following extensions:
     
     
   • htm*
   • sht*
   • php
   • asp
   • dbx
   • tbb
   • adb
   • wab
   • txt
     
     
6. Attempts to send itself as and email using its own SMTP engine. The email will have the following characteristics:
   
   From:
   One of the following, with a .edu domain:
   
   • john
   • alex
   • michael
   • james
   • mike
   • kevin
   • david
   • george
   • sam
   • andrew
   • jose
   • leo
   • maria
   • jim
   • brian
   • serg
   • mary
   • ray
   • tom
   • peter
   • robert
   • bob
   • jane
   • joe
   • dan
   • dave
   • matt
   • steve
   • smith
   • stan
   • bill
   • bob
   • jack
   • fred
   • ted
   • adam
   • brent
   • alice
   • anna
   • brenda
   • claudia
   • debby
   • helen
   • jerry
   • jimmy
   • julie
   • linda
   • sam
     
     The worm may also spoof an address from one of those found on the computer.
     
     Subject:
     One of the following: 
     
     
   • Notice: **Last Warning**
   • Your email account access is restricted
   • Your Email Account is Suspended For Security Reasons
   • Notice:***Your email account will be suspended***
   • Security measures
   • Email Account Suspension
   • *IMPORTANT* Please Validate Your Email Account
   • *IMPORTANT* Your Account Has Been Locked
     
     Message body: 
     One of the following: 
     
     
   • Once you have completed the form in the attached file , your account records will not be interrupted and will continue as normal.
   • To unblock your email account acces, please see the attachement.
   • Please see the attachement.
   • We have suspended some of your email services, to resolve the problem you should read the attached document.
   • To safeguard your email account from possible termination, please see the attached file.
   • please look at attached document.
   • Account Information Are Attached!
     
     Attachment:
     One of the following: 
     
     
   • email-doc
   • info
   • text
   • doc
   • your_details
   • document_full
   • INFO
   • IMPORTANT
   • info-text
     
     With one of the following file extensions:
     
     
   • .pif
   • .scr
   • .exe
   • .cmd
   • .bat
   • .zip
     
     Note: If the attachment is a .zip file, a copy of the worm is contained within. The file name within the .zip file is the same as the .zip file.
     
     
7. Attempts to end the following processes, some of which may be security related:
   
   
   • regedit.exe
   • msconfig.exe
   • cmd.exe
   • taskmgr.exe
   • netstat.exe
   • zapro.exe
   • navw32.exe
   • navapw32.exe
   • zonealarm.exe
   • wincfg32.exe
   • PandaAVEngine.exe
     
     
8. Adds the following text to the Hosts file to block access to several security-related Web sites:
   
   127.0.0.1 www.symantec.com
   127.0.0.1 securityresponse.symantec.com
   127.0.0.1 symantec.com
   127.0.0.1 www.sophos.com
   127.0.0.1 sophos.com
   127.0.0.1 www.mcafee.com
   127.0.0.1 mcafee.com
   127.0.0.1 liveupdate.symantecliveupdate.com
   127.0.0.1 www.viruslist.com
   127.0.0.1 viruslist.com
   127.0.0.1 viruslist.com
   127.0.0.1 f-secure.com
   127.0.0.1 www.f-secure.com
   127.0.0.1 kaspersky.com
   127.0.0.1 kaspersky-labs.com
   127.0.0.1 www.avp.com
   127.0.0.1 www.kaspersky.com
   127.0.0.1 avp.com
   127.0.0.1 www.networkassociates.com
   127.0.0.1 networkassociates.com
   127.0.0.1 www.ca.com
   127.0.0.1 ca.com
   127.0.0.1 mast.mcafee.com
   127.0.0.1 my-etrust.com
   127.0.0.1 www.my-etrust.com
   127.0.0.1 download.mcafee.com
   127.0.0.1 dispatch.mcafee.com
   127.0.0.1 secure.nai.com
   127.0.0.1 nai.com
   127.0.0.1 www.nai.com
   127.0.0.1 update.symantec.com
   127.0.0.1 updates.symantec.com
   127.0.0.1 us.mcafee.com
   127.0.0.1 liveupdate.symantec.com
   127.0.0.1 customer.symantec.com
   127.0.0.1 rads.mcafee.com
   127.0.0.1 trendmicro.com
   127.0.0.1 www.trendmicro.com
   127.0.0.1 www.grisoft.com
   127.0.0.1 www.microsoft.com
   -=Copyright (C) 2005-2006 [REMOVED] Team All Rights Reserved.=-

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.