Backdoor.Haxdoor.E

1. Drops the following copies of itself:
   
   
   • %System%\avpx64.sys (19728 bytes)
   • %System%\qz.sys (19728 bytes)
   • %System%\avpx32.sys (4096 bytes)
   • %System%\qy.sys (4096 bytes)
     
     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. Drops the following files, which are copies of Backdoor.Haxdoor.C:
   
   
   • %System%\avpx32.dll (35349 bytes)
   • %System%\qz.dll (35349 bytes)
     
     
3. Creates the following files:
   
   
   • %System%\redir2.a3d
   • %System%\fltr.a3d
   • %System%\p3.ini
     
     Note: The Trojan hides all of the above files using a rootkit.
     
     
4. Creates the services avpx32 and avpx64 by creating the following registry subkeys:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\avpx32
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\avpx64
   
   Note: The Trojan also hides all of the above services using a rootkit.
   
   
5. Adds the values:
   
   "secureUID" = "[RANDOM NUMBER]"
   "secureTIME" = "[DAY:MONTH]"
   "DllName" = "avpx32.dll"
   "Startup" = "MmMapView3"
   "Impersonate"
   "Asynchronous "
   "MaxWait "
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   \Notify\avpx32
   
   on computers running Windows XP/2000/NT so that it is executed every time Windows starts.
   
   
6. Adds the values:
   
   "DllName" = "avpx32.dll"
   "EntryPoint" = "MmMapView3"
   "StackSize" = "0"
   "SecureID" = "[RANDOM NUMBER]"
   "SecureTIME" = "[DAY:MONTH]"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\MPRServices\TestService
   
   on computers running Windows 98/Me so that it is executed every time Windows starts.
   
   
7. Creates the following registry entries so that it runs in safe mode:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
   \avpx32.sys
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network
   \avpx32.sys
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal
   \avpx64.sys
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SafeBoot\Network
   \avpx64.sys
   
   
8. Adds the value:
   
   "EnforceWriteProtection" = "0"
   
   to the registry entry:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager
   \Memory Management
   
   to prevent the computer from checking for abnormal memory overwrite and to allow the Trojan to overwrite parts of the memory.
   
   
9. Attempts to hide its presence by injecting avpx32.dll into the process of explorer.exe and executing a remote thread.
   
   
10. Attempts to delete following registry subkey, which may be related to older versions of the Trojan:
    
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    \Notify\drct16
    
    
11. Opens a back door on TCP port 7080, 8008, or 16661. The remote attacker can then perform the following actions on the compromised computer:
    
    
    • Download files
    • Execute programs
    • Control the device driver of the rootkit
    • Steal passwords stored in Protected Storage
    • Steal cached passwords by calling WNetEnumCachedPasswords API
    • Steal the Miranda IM password
    • Gather dialup connection information
    • Check if webmoney application is installed on the compromised computer
    • Steal the ICQ password
    • Log keystrokes
      
      
12. Injects code into the following processes, which results in avpx32.dll being loaded into these processes:
    
    
    • explorer.exe
    • iexplore.exe
    • opera.exe
    • myie.exe
    • mozilla.exe
    • thebat.exe
    • outlook.exe
    • msn.exe
    • icq.exe
      
      
13. Steals information by opening the URL cache file (History.IE5\index.dat), and looking for the following strings:
    
    
    • ebay.com
    • paypal.c
    • e-gold.c
      
      
14. Attempts to end the following processes:
    
    
    • zapro.exe
    • vsmon.exe
    • jamapp.exe
    • atrack.exe
    • iamapp.exe
    • FwAct.exe
    • mpfagent.exe
    • outpost.exe
    • zlclient.exe
    • mpftray.exe
      
      
15. Redirects access from the following domains to the microsoft.com domain:
    
    
    • avp.ch
    • avp.com
    • avp.ru
    • awaps.net
    • customer.symantec.com
    • dispatch.mcafee.com
    • download.mcafee.com
    • downloads1.kaspersky-labs.com
    • downloads1.kaspersky-labs.com
    • downloads1.kaspersky-labs.com
    • downloads2.kaspersky-labs.com
    • downloads3.kaspersky-labs.com
    • downloads4.kaspersky-labs.com
    • downloads-us1.kaspersky-labs.com
    • downloads-us2.kaspersky-labs.com
    • downloads-us3.kaspersky-labs.com
    • engine.awaps.net
    • f-secure.com
    • ftp.avp.ch
    • ftp.downloads2.kaspersky-labs.com
    • ftp.f-secure.com
    • ftp.kasperskylab.ru
    • ftp.kaspersky.ru
    • d-ru-1f.kaspersky-labs.com
    • d-ru-2f.kaspersky-labs.com
    • d-eu-1f.kaspersky-labs.com
    • d-eu-2f.kaspersky-labs.com
    • d-us-1f.kaspersky-labs.com
    • ftp.sophos.com
    • ids.kaspersky-labs.com
    • kaspersky.com
    • kaspersky-labs.com
    • liveupdate.symantec.com
    • liveupdate.symantec.com
    • liveupdate.symantec.com
    • liveupdate.symantecliveupdate.com
    • liveupdate.symantecliveupdate.com
    • mast.mcafee.com
    • mcafee.com
    • my-etrust.com
    • networkassociates.com
    • phx.corporate-ir.net
    • rads.mcafee.com
    • securityresponse.symantec.com
    • service1.symantec.com
    • sophos.com
    • spd.atdmt.com
    • symantec.com
    • trendmicro.com
    • update.symantec.com
    • updates.symantec.com
    • updates1.kaspersky-labs.com
    • updates1.kaspersky-labs.com
    • updates2.kaspersky-labs.com
    • updates3.kaspersky-labs.com
    • updates3.kaspersky-labs.com
    • updates4.kaspersky-labs.com
    • updates5.kaspersky-labs.com
    • us.mcafee.com
    • virustotal.com
      
      
16. Retrieves detailed account information by accessing the following URL with some locally stolen information added as parameters:
    
    [https://]www.e-gold.com/[REMOVED]acct/accountinfo.asp
    
    
17. Sends an email containing the stolen information to a predetermined email address.
    
    
18. Hides the existence of the predetermined files, such as avpx32.dll, avpx32.sys, and avpx64.sys. It also hides the existence of the predetermined process.
    
    
19. Controls and accesses the keyboard, the display, the floppy drive, and CMOS.
    
    
20. Ends a process specified by avpx32.dll.
    
    
21. Copies the system password file %System%\config\SAM to %System%\config\SSL.

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.