Trojan.Watsoon.A

1. Copies itself as one or more of the following file names:
   
   • %System%\drwatsoon.exe
   • %System%\krnl386Mem
   • %System%\mobsyncs.exe
   • %System%\ntsrvosi386.vxd
     
     
2. Drops and executes a file named %System%\NClienti386.exe, which is detected as Backdoor.Trojan. This file provides the backdoor functionality of the Trojan, listening for remote connections on TCP port 1938.
   
   
3. Once authenticated, the remote user will have full access to the system with the ability to perform any of the following actions.
   
   
   • Download and execute files
   • Upload/Download files
   • Execute files
   • Kill processes
   • Copy, move, or delete files and folders
   • Retrieve system information
     
     
4. May drop and execute a file named %System%\Neti386, which is used to gather user account names and passwords.
   
   
5. Adds the value:
   
   "Srv RPCrom"="%System%\NClienti386.exe"
   
   to the registry keys:
   
   HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
   
   so that Trojan.Watsoon.A runs every time Windows starts.
   
   
6. Adds the values:
   
   "Sync Server"="%System%\drwatsoon.exe /n logon"
   "Srv RPCrom"="%System%\NClienti386.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that Trojan.Watsoon.A runs every time Windows starts.
   
   
7. Adds the following value:
   
   "Shell" = "explorer.exe drwatsoon.exe"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   
   
8. Adds the following value:
   
   "load" = "%System%\mobsyncs.exe"
   
   to the registry key:
   
   HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
   
   
9. Adds the following value:
   
   "AutoRun" = "echo off|%System%\mobsyncs.exe /n"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor
   
   
10. May create one or more of the following services:
    
    
    • NTi386 Authorization Service
    • TCP/IP Mac Os
    • TCP/IP NetBios Service Manager
    • TCP/IP Routing Srv
    • Mac Client Service
      
      
11. Drops a random number of copies of itself to the following locations:
    
    
    • %System%\[random filename]
    • %Start Menu%\[random filename]
    • %Start Menu%\Programs\[random filename]
      
      using some of the following file names:
      
      
    • ACD Wallpapers
    • Accounting Report
    • Adult on night
    • Adventure Stuff
    • Avril.L - Complicated
    • Backup on dec 2003
    • Bank data
    • Biblio
    • Black Book
    • Blue Laces 16
    • Blue Porn 17 age
    • Britney.s Feat Metalica - Sanitarium
    • Coffee Beans
    • Data Owner
    • Destiny Child - Say My Name
    • Don't Open Me
    • Eminem - Sex4Me
    • FBI Wanted
    • FeatherTextures
    • Fire Hole
    • Gone Fishings
    • Greenstones
    • Hacker Tutorial1
    • Hacker Tutorial2
    • Java - Bad Habbit
    • Java - The Virus
    • Last Archive
    • Limpbizkit - Eat you Alive
    • Limpbizkit - My Way
    • Limpbizkit Feat Korn - Destroy
    • My Hearts
    • Nirvana - Love Buzz
    • Nite Vision
    • Northwind
    • Oh ye Kiss Me now
    • Play And Destroy
    • Porn Articel
    • Porn baby
    • Prairie Winds
    • Rhododendrons
    • River Sumidas
    • SQL Replica
    • Sallary inc
    • Santa Fe Stuccos
    • Sepultura - Root
    • Setup its
    • Sex Penis
    • Sexy Honey
    • Soap Bubbless
    • Tonk Hawk - Intro Destroy
    • Try This if you have heart
    • Vagina mmm..mm
    • What up doc
    • Who is terrorist
    • Winnts
    • Zapotecs
    • dba Stored
      
      with one of the following extensions:
      
      
    • .exe
    • .pif
    • .scr
      
      
12. Iterates through the hard drive of the infected host and may randomly drop copies of itself to the directories found with file names above.
    
    
13. Monitors the process list and will attempt to kill the following processes:
    
    • regedit.exe
    • taskmgr.exe
      
      
14. Attempts to log keystrokes, which are stored in a local log file. The remote user, who is connected via the backdoor, can pick up this log file.
    
    

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.