BKDR_VAWTRAK.F

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.

It is injected into all running processes to remain memory resident.

It does not have any propagation routine.

It executes commands from a remote malicious user, effectively compromising the affected system. However, as of this writing, the said sites are inaccessible.

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.

Installation

This backdoor is injected into all running processes to remain memory resident.

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}.{malware extension name}""

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{GUID 1}

HKEY_CLASSES_ROOT\CLSID\{GUID 2}

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

HKEY_CURRENT_USER\Software\Classes\
CLSID\{GUID 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_CLASSES_ROOT\CLSID\{GUID 1}
#cert = "{hex value}"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{GUID 1}
#cert = "{hex value}"

HKEY_CLASSES_ROOT\CLSID\{GUID 2}
{GUID 3} = "{hex value}"

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

HKEY_CLASSES_ROOT\CLSID\{GUID 2}
{GUID 4} = "{encrypted form of config data}"

HKEY_CURRENT_USER\Software\Classes\
CLSID\{GUID 2}
{GUID 4} = "{encrypted form of config data}"

Propagation

This backdoor does not have any propagation routine.

Backdoor Routine

This backdoor executes the following commands from a remote malicious user:

• Update itself
• Download and execute files
• List active processes
• Perform remote shell
• Execute file
• Keylog
• Capture Screenshot
• Monitor sound
• Start/Stop process (iexplore.exe, firefox.exe, outlook.exe, explorer.exe, cmd.exe, taskmgr.exe)
• Inject to process
• Get clipboard data
• Receive config data which is saved on registry

It connects to the following URL(s) to send and receive commands from a remote malicious user:

• http://blubadar.com/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://dukeregi.com/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://lorseda.com/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://pinello.net/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://kidrion.pw/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://seflida.com/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://dinklip.com/param/{number1}/data/{number2}/{hex values}f?a={number3}
• http://perdonik.com/param/{number1}/data/{number2}/{hex values}f?a={number3}

However, as of this writing, the said sites are inaccessible.

Information Theft

This backdoor attempts to steal stored account information used in the following installed File Transfer Protocol (FTP) clients or file manager software:

• 3D-FTP
• AceBIT
• AceFTP
• ALFTP
• BitKinex
• BlazeFtp
• BulletProof FTP
• ClassicFTP
• CoffeeCup Software
• Cyberduck
• DeluxeFTP
• Directory Opus
• EasyFTP
• ExpanDrive
• FarManager
• FFFTP
• FileZilla
• FlashFXP
• Fling FTP
• FreshFTP
• FTP Commander
• FTP Explorer
• FTP Navigator
• FTPGetter
• FTPNow
• FTPRush
• FTPShell
• FTPVoyager
• FTPWare
• GlobalSCAPE CuteFTP 6 Home
• GlobalSCAPE CuteFTP 7 Home
• GlobalSCAPE CuteFTP 8 Home
• GlobalSCAPE CuteFTP
• GlobalSCAPE CuteFTP 8 Professional
• GlobalSCAPE CuteFTP 6 Professional
• GlobalSCAPE CuteFTP 7 Professional
• GlobalSCAPE CuteFTP Lite
• GlobalSCAPE CuteFTP Pro
• GoFTP
• LeapFTP
• LeechFTP
• LinasFTP
• My FTP
• NetDrive
• NetSarang
• NexusFile
• NovaFTP
• PuTTY
• RhinoSoft
• Robo-FTP
• SecureFX
• SmartFTP
• SoftX FTP
• Staff-FTP
• Titan FTP
• Total Commander
• TurboFTP
• UltraFXP
• WinFTP
• WinSCP
• WS_FTP

It attempts to steal stored email credentials from the following:

• IncrediMail
• Outlook
• PocoMail
• The Bat!
• Thunderbird
• Windows Live Mail
• Windows Mail

It attempts to get stored information such as user names, passwords, and hostnames from the following browsers:

• Epic Browser
• Flock
• K-Meleon
• Mozilla Firefox
• SeaMonkey

NOTES:

It does not have rootkit capabilities.

It does not exploit any vulnerability.