Analysis by: Janus Agcaoili
ALIASES:

Backdoor:Win32/Vawtrak (Microsoft), BackDoor-FCAW!Vawtrak (McAfee), Backdoor.Vawtrak.F6 (CAT-QuickHeal)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

Tamaño del archivo 226,256 bytes
Tipo de archivo DLL
Residente en memoria Yes
Fecha de recepción de las muestras iniciales 10 Mar 2016

Arrival Details

This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Autostart Technique

This backdoor adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{malware filename} = "regsvr32.exe "{malware path\{malware filename}""

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 1}

HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 2}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
NoProtectedModeBanner = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
TabProcGrowth = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
Zones\3
2500 = "3"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 1}
#cert = "31"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{CLSID 2}
{CLSID 3} = "{hex values}"

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.184.239/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}ng.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}rda.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}ka.com%2520/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}.{BLOCKED}.192.106/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}ka.com%2520/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}.{BLOCKED}.192.110/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}ag.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}xon.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}.{BLOCKED}.51.216/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}.{BLOCKED}.233.38/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}lon.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}.{BLOCKED}.233.80/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}z.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637
  • http://{BLOCKED}lpane.com/viewforum.php?f=47&sid=F1E1486D759FB3251067AC7C8EA16637

  SOLUTION

Motor de exploración mínimo 9.750
Primer archivo de patrones de VSAPI 12.404.05
Primera fecha de publicación de patrones de VSAPI 15 Mar 2016
Versión de patrones OPR de VSAPI 12.405.00
Fecha de publicación de patrones OPR de VSAPI 16 Mar 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {malware filename} = "regsvr32.exe "{malware path\{malware filename}""
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • NoProtectedModeBanner = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • TabProcGrowth = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • 2500 = "3"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_VAWTRAK.YUYJF. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 6

The following created files/folders/registry keys/registry entries cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present system information with a backup. Note that the said components do not have to be deleted since it won't be harmful to the system.

  • HKEY_CURRENT_USER\Software\Classes\CLSID
    • {CLSID 1}
  • HKEY_CURRENT_USER\Software\Classes\CLSID
    • {CLSID 2}


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