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  3. Trojan.Banker.I

Trojan.Banker.I

Risk Level 1: Very Low

Discovered:
May 23, 2011
Updated:
May 24, 2011 8:05:06 AM
Type:
Trojan
Infection Length:
Varies
Systems Affected:
Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
It has been reported that this threat is installed by exploiting various Java vulnerabilities. Symantec detects the malicious Java applet as Trojan.Maljava.

When the Java vulnerabilities are exploited, the Trojan copies itself as the following files:
  • %Temp%\aaa.bat
  • %Temp%\drivers\plusdriver.sys
  • %Temp%\drivers\plusdriver64.sys

It also creates the following files:
  • %Temp%\bcdedit.exe
  • %Temp%\add.reg
  • %Temp%\cert_override.txt

The Trojan then checks the OS version and sends notification of infection to the following remote site:
[http://]216.155.133.238

It then downloads the following file:
%Temp%\hs_err_pid_0x00001

On Windows Vista or 7, it executes the legitimate file bcdedit.exe and modifies system settings to allow execution of unsigned drivers on the compromised computer.

Next, the Trojan creates the following registry subkeys to add fake SSL certificates in Internet Explorer:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\26ED6B892DA143F2A6B9E036C5CDDF85CBC0765D
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\82BBA26B4E65F5ECA46D1A8A96680EAC6CC558DF
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\A3619459A05A7696ABF500F1E596C2B10278BB00
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\2449D76A4EEB649EFA77358A44D614324C160173
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\SystemCertificates\AuthRoot\Certificates\6F5D9C2F1EF3EC72A6958E69C19FF80E54AB00FC

The threat then searches for Firefox and if it finds presence of it on the compromised computer, it adds fake SSL certificates for the following websites:
  • aapj.bb.com.br
  • www2.bancobrasil.com.br
  • www.santandernet.com.br
  • www.realsecureweb.com.br
  • www2.realsecureweb.com.br

It then adds the following DNS entries to both LAN and WiFi networks:
  • 174.36.27.196
  • 8.8.4.4

The Trojan the creates the following registry entry so that it runs every time Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Sistema Operacional" = "cmd.exe /c %tmp%/aaa.bat"

It then creates the following service:
Service Name: driverusbplus
Image Path: %Windir%\system32\drivers\plusdriver.sys

If the threat determines that is running on a 64-bit OS, it creates the following service:
Service Name: driverusbplus64
Image Path: %Windir%\SysWOW64\drivers\plusdriver64.sys

Next, the Trojan overwrites host file with following text:
  • 216.155.133.236 www2.bancobrasil.com.br
  • 216.155.133.237 aapj.bb.com.br

The Trojan then deletes following files:
  • %DriveLetter%\Arquivos de programas\Gbplugin\gbiehAbn.dll
  • %DriveLetter%\Program Files\Gbplugin\gbiehAbn.dll
  • %DriveLetter%\Program Files (x86)\Gbplugin\gbiehAbn.dll
  • %DriveLetter%\Arquivos de programas\GbPlugin\abn.gpc
  • %DriveLetter%\Program Files\GbPlugin\abn.gpc
  • %DriveLetter%\Program Files (x86)\GbPlugin\abn.gpc
  • %DriveLetter%\windows\Downloaded Program Files\ABN.inf
  • %DriveLetter%\windows\Downloaded Program Files\ABN.gpc
  • %DriveLetter%\windows\Downloaded Program Files\gbiehabn.dll
  • %DriveLetter%\windows\Downloaded Program Files\GbpluginABN.inf
  • %DriveLetter%\windows\Downloaded Program Files\gbpdist.dll
  • %DriveLetter%\windows\Downloaded Program Files\gbiehAbn.dll
  • %DriveLetter%\windows\system32\drivers\gbpkm.sys
  • %DriveLetter%\Arquivos de programas\Gbplugin\gbieh.gmd
  • %DriveLetter%\Program Files\Gbplugin\gbieh.gmd
  • %DriveLetter%\Program Files (x86)\Gbplugin\gbieh.gmd
  • %DriveLetter%\Arquivos de programas\Gbplugin\bb.gpc
  • %DriveLetter%\Program Files\Gbplugin\bb.gpc
  • %DriveLetter%\Program Files (x86)\Gbplugin\bb.gpc
  • %DriveLetter%\Arquivos de programas\Gbplugin\gbieh.dll
  • %DriveLetter%\windows\Downloaded Program Files\gbieh.gmd
  • %DriveLetter%\Program Files\GbPlugin\gbieh.dll
  • %DriveLetter%\Program Files (x86)\GbPlugin\gbieh.dll
  • %DriveLetter%\Arquivos de programas\GbPlugin\GbpSv.exe
  • %DriveLetter%\Program Files\GbPlugin\GbpSv.exe
  • %DriveLetter%\Program Files (x86)\GbPlugin\GbpSv.exe
  • %DriveLetter%\Arquivos de programas\GbPlugin\gbpdist.dll
  • %DriveLetter%\Program Files\GbPlugin\gbpdist.dll
  • %DriveLetter%\Program Files (x86)\GbPlugin\gbpdist.dll

It also deletes following registry subkeys:
  • HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\GbpKm
  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\GbpKmg
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\ GbpluginBb

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.
Writeup By: Kaoru Hayashi
Summary| Technical Details| Removal

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