W32.Donk.S

1. Creates the following copies of itself:
   
   • %System%\cool.exe
     
     and one of the following:
     
   • %System%\ntsysmgr.exe
   • %System%\libsysmgr.exe
     
     Notes: %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 one of the following values:
   
   "Microsoft System Checkup"="ntsysmgr.exe"
   "Microsoft System Checkup"="libsysmgr.exe"
   
   to the registry keys:
   
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunServices
   
   so that the worm will be executed every time Windows starts.
   
   
3. Adds the value:
   
   "NT Logging Service"= "syslog32.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that the worm will be executed every time Windows starts.
   
   Note: The worm never drops the syslog32.exe file.
   
   
4. Checks network connectivity by connecting to URLs on the following domains:
   
   • w3.org
   • geocities.com
   • freewebpage.org
   • fortunecity.co.uk
   • angelfire.com
   • warez.com
   • sms.ac
   • isohunt.com
   • wincustomize.com
   • ftp.as.ro
   • dot.tk
   • irc.dal.net
   • irc.undernet.org
   • hotmail.com
   • msn.com
   • google.com
   • yahoo.com
     
     
     If the worm confirms that it has a network connection, it attempts to exploit the following vulnerabilities by sending data to random IP addresses:
     
   • The DCOM RPC vulnerability (described in Microsoft Security Bulletin MS03-026) using TCP port 135.
   • The Microsoft Windows Local Security Authority Service Remote Buffer Overflow (described in Microsoft Security Bulletin MS04-011) using TCP port 455.
   • The WebDav vulnerability (described in Microsoft Security Bulletin MS03-007) using TCP port 80.
     
     When the worm finds a vulnerable computer, it opens a back door by creating a hidden remote shell process that will listen on TCP port 4444. This allows an attacker to issue remote commands on an infected computer. It may also send a copy of the worm to the vulnerable computer.
     
     
5. Terminates several security related processes. A full list of these processes is available in the additional information section below.
   
   
6. Prevents access to several security related Web sites by modifying the hosts file in %System%\drivers\etc and adding the following lines:
   
   127.0.0.1  www.trendmicro.com                          
   127.0.0.1  trendmicro.com                              
   127.0.0.1  rads.mcafee.com                            
   127.0.0.1  customer.symantec.com                      
   127.0.0.1  liveupdate.symantec.com                    
   127.0.0.1  us.mcafee.com                              
   127.0.0.1  updates.symantec.com                        
   127.0.0.1  update.symantec.com                        
   127.0.0.1  www.nai.com                                
   127.0.0.1  nai.com                                    
   127.0.0.1  secure.nai.com                              
   127.0.0.1  dispatch.mcafee.com                        
   127.0.0.1  download.mcafee.com                        
   127.0.0.1  www.my-etrust.com                          
   127.0.0.1  my-etrust.com                              
   127.0.0.1  mast.mcafee.com                            
   127.0.0.1  ca.com                                      
   127.0.0.1  www.ca.com                                  
   127.0.0.1  networkassociates.com                      
   127.0.0.1  www.networkassociates.com                  
   127.0.0.1  avp.com                                    
   127.0.0.1  www.kaspersky.com                          
   127.0.0.1  www.avp.com                                
   127.0.0.1  kaspersky.com                              
   127.0.0.1  www.f-secure.com                            
   127.0.0.1  f-secure.com                                
   127.0.0.1  viruslist.com                              
   127.0.0.1  www.viruslist.com                          
   127.0.0.1  liveupdate.symantecliveupdate.com          
   127.0.0.1  mcafee.com                                  
   127.0.0.1  www.mcafee.com                              
   127.0.0.1  sophos.com                                  
   127.0.0.1  www.sophos.com                              
   127.0.0.1  symantec.com                                
   127.0.0.1  securityresponse.symantec.com              
   127.0.0.1  www.symantec.com  
   
   
7. Copies itself to administrative shares using the following username and password combinations:
   
   Username:
   
   • SST
   • database
   • sql
   • Root
   • admin
   • Guest
   • home
   • Administrateur
   • Verwalter
   • User
   • Default
   • administrator
   • Administrator
     
     
     Password:
     
   • 101
   • pw
   • mypass
   • pw123
   • admin123
   • 557
   • mypc
   • love
   • pass
   • pwd
   • Login
   • login
   • owner
   • xxx
   • home
   • zxcv
   • yxcv
   • qwer
   • secret
   • asdf
   • pc
   • win
   • temp123
   • temp
   • test123
   • test
   • abc
   • aaa
   • a
   • sex
   • god
   • root
   • administrator
   • alpha
   • 007
   • 123abc
   • 0
   • 2003
   • 2002
   • xp
   • enable
   • 123asd
   • super
   • Internet
   • computer
   • server
   • 123qwe
   • sybase
   • oracle
   • abc123
   • abcd
   • database
   • passwd
   • pass
   • 111
   • 54321
   • 654321
   • 123456789
   • 1234567
   • 123
   • 12
   • 1
   • Password
   • Admin
   • admin
   • 1234
   • 12345
   • 12345678
   • letmein
   • qwerty
   • 7777
   • 1111
   • asd#321
   • 6969
   • 123456
   • password
     
     
     If successful, the worm will copy itself into the following directories on the remote systems:
     
   • C:\Documents and Settings\All Users\Start Menu\Programs\Startup
   • C:\WINDOWS\Start Menu\Programs\Startup
   • C:\WINNT\Profiles\All Users\Start Menu\Programs\Startup
   • \WINNT\Profiles\All Users\Start Menu\Programs\Startup
   • \WINDOWS\Start Menu\Programs\Startup
   • \Documents and Settings\All Users\Start Menu\Programs\Startup
     
     
     
8. Downloads and executes the following files from a series of predetermined Web servers:
   
   • %Temp%\upd32a.exe
   • %Temp%\kspd32a.exe
   • %System%\navinst.exe
     
     Note: %Temp% is a variable that refers to the Windows temporary folder. By default, this is C:\Windows\TEMP (Windows 95/98/Me/XP) or C:\WINNT\Temp (Windows NT/2000).
     
     
9. Opens a backdoor by connecting to an IRC channel and listening for commands. These commands typically allow the remote attacker to perform some of the following actions on the compromised computer:
   
   • Perform DDoS attacks on third parties.
   • Download and execute remote files.

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.