1. Symantec/
  2. Security Response/
  3. Trojan.Betabot


Risk Level 1: Very Low

February 25, 2013
February 25, 2013 5:46:32 PM
Infection Length:
244,748 bytes
Systems Affected:
When the Trojan is executed, it copies itself to the following location:
%ProgramFiles%\Common Files\[TROJAN FOLDER NAME].{2227A280-3AEA-1069-A2DE-08002B30309D}\[NINE RANDOM LOWER CASE CHARACTERS].exe

Where [TROJAN FOLDER NAME] is one of the following:
  • Flash Update Client
  • Windows Licence Check

Next the Trojan creates the following registry entries so that it executes whenever Windows starts:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"[TROJAN FOLDER NAME]" = "[PATH TO TROJAN EXECUTABLE]"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Run\"[TROJAN FOLDER NAME]" = "[PATH TO TROJAN EXECUTABLE]"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\"[TROJAN FOLDER NAME]" = "[PATH TO TROJAN EXECUTABLE]"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\"[TROJAN FOLDER NAME]" = "[PATH TO TROJAN EXECUTABLE]"

It may also create some of the following registry entries:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\[TROJAN FILE NAME]\"Time" = ""
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\[TROJAN FILE NAME]\"DisableExceptionChainValidation" = ""
  • HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\TaskManager\"Task Service ID" = "[RANDOM HEXADECIMAL CHARACTERS]"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows NT\CurrentVersion\TaskManager\"Task Service ID" = "[RANDOM HEXADECIMAL CHARACTERS]"
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\TaskManager\"Task Service ID" = "[RANDOM HEXADECIMAL CHARACTERS]"
  • HKEY_ALL_USERS\.default\Software\Win7zip\"Uuid" = "[RANDOM HEXADECIMAL CHARACTERS]"

The Trojan then modifies the following registry entries to lower Internet security settings:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\"2500" = "3"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"2500" = "3"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\"2500" = "3"
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4\"2500" = "3"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\1\"2500" = "3"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\2\"2500" = "3"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3\"2500" = "3"
  • HKEY_ALL_USERS\.default\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4\"2500" = "3"

It also modifies the following registry entries:
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\"ShowSuperHidden" = "0"
  • HKEY_LOCAL_MACHINE\system\CurrentControlSet\Services\SSDPSRV\"Start" = "2"
  • HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Update\Policy\"EnableJavaUpdate" = "0"

Next, the Trojan creates a hidden instance of the iexplore.exe process and injects code into it.

It then connects to one of the following locations and opens a back door allowing a remote attacker to gain access to the compromised computer:
  • [http://]webhostingprotection.info/icool/orde[REMOVED]
  • [http://]assler.hfgfr56745fg.com/cakes/sale[REMOVED]

The Trojan then ends all programs with open windows, including explorer.exe.


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.
Writeup By: Fergal Ladley
Summary| Technical Details| Removal

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