Where to Buy Trend Micro Products

For Home

For Small Business

1-888-762-8736
(M-F 8:00am-5:00pm CST)

For Enterprise

1-877-218-7353
(M-F 8:00am-5:00pm CST)

Not in the United States?
Select the country/language of your choice:

Asia Pacific Region

Europe

The Americas

Not in the United States?
Select the country/language of your choice:

Asia/Pacific

Europe

America

Login

For Home

For Business

For Partners

Threat Encyclopedia

BKDR_VAWTRAK.A

ANALYSIS BY

Rika Joi Gregorio


PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted:

  • In the wild: Yes

OVERVIEW

Infection Channel:

Downloaded from the Internet


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

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It deletes itself after execution.

TECHNICAL DETAILS

File Size:

256,014 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Sep 2013

Payload:

Compromises system security, Steals information, Connects to URLs/IPs

Arrival Details

This backdoor may be downloaded from the following remote sites:

  • http://{BLOCKED}l.com/img/pdf_trk_1Z53T52WDK95016011.zip

Installation

This backdoor drops the following files:

  • %All Users Profile%\Application Data\{random file name}.dat - detected as BKDR_VAWTRAK.A
  • %Program Data%\{random file name}.dat - detected as BKDR_VAWTRAK.A for Windows Vista and 7 only

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

It 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
{random file name} = "regsvr32.exe /s "%All Users Profile%\Application Data\{random file name}.dat""

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random file name} = "regsvr32.exe /s "%Program Data%\{random file name}.dat"" for Windows Vista and 7 only

Other System Modifications

This backdoor adds the following registry keys:

HKEY_CURRENT_USER\SOFTWARE\AppDataLow\
{random key 1}

HKEY_CURRENT_USER\SOFTWARE\AppDataLow\
{random key 2}

It adds the following registry entries:

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

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

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

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers
DefaultLevel = "262144"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers
TransparentEnabled = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers
PolicyScope = "0"

HKEY_CURRENT_USER\SOFTWARE\AppDataLow\
{random key 2}
{random} = "{random}"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers
ExecutableTypes = "ADE ADP BAS BAT CHM CMD COM CPL CRT EXE HLP HTA INF INS ISP LNK MDB MDE MSC MSI MSP MST OCX PCD PIF REG SCR SHS URL VB WSC"

It deletes the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Safer\
CodeIdentifiers\0\Paths

Backdoor Routine

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

  • Keylog
  • Capture screenshots
  • Start process (iexplore.exe, firefox.exe, outlook.exe, explorer.exe, cmd.exe, taskmgr.exe)
  • Inject to process
  • Perform remote shell
  • Update Itself
  • List processes
  • Download and execute files

It connects to the following websites to send and receive information:

  • http://{BLOCKED}.{BLOCKED}.188.50/post.aspx?forumID={random digit}
  • http://{BLOCKED}.{BLOCKED}.188.50/forumdisplay.php?fid={random digit}
  • http://{BLOCKED}.{BLOCKED}.188.50/post.aspx?forumID={random digit}
  • {BLOCKED}.{BLOCKED}.56.247
  • {BLOCKED}n.com.tw
  • {BLOCKED}g.com.tw

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

Other Details

This backdoor deletes itself after execution.

NOTES:

It checks for the presence of the following security-related directories in %Program Files% and %All Users Profile%\Application Data:

  • %System Root%:\Documents and Settings\NetworkService\Local Settings\Application Data\F-SecureF-Secure Internet Security
  • a-squared Anti-Malware
  • a-squared HiJackFree
  • Agnitum
  • Alwil Software
  • AnVir Task Manager
  • ArcaBit
  • AVAST Software
  • AVG
  • avg8
  • Avira GmbH
  • Avira
  • BitDefender
  • BlockPost
  • Common Files\Doctor Web
  • Common Files\G DATA
  • Common Files\P Tools
  • Common Files\Symantec Shared
  • DefenseWall
  • DefenseWall HIPS
  • Doctor Web
  • DrWeb
  • ESET
  • f-secure
  • FRISK Software
  • G DATA
  • K7 omputing
  • Kaspersky Lab Setup Files
  • Kaspersky Lab
  • Lavasoft
  • Malwarebytes
  • Malwarebytes' Anti-Malware
  • McAfee
  • McAfee.com
  • Microsoft Security Client
  • Microsoft Security Essentials
  • Microsoft\Microsoft Antimalware
  • Norton AntiVirus
  • Online Solutions
  • P Tools Internet Security
  • P Tools
  • Panda Security
  • Positive Technologies
  • Sandboxie
  • Security Task Manager
  • Spyware Terminator
  • Sunbelt Software
  • Symantec
  • Trend Micro
  • UAenter
  • Vba32
  • Xore
  • Zillya Antivirus

It can only perform its intended routine once it is injected in the following processes:

  • chrome.exe
  • explorer.exe
  • firefox.exe
  • iexplore.exe

SOLUTION

Minimum Scan Engine:

9.300

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

Restart in Safe Mode

[ Learn More ]

Step 3

Delete this registry key

[ 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\AppDataLow
    • {random key 1}
  • In HKEY_CURRENT_USER\SOFTWARE\AppDataLow
    • {random key 2}

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
    • {random file name} = "regsvr32.exe /s "%All Users Profile%\Application Data\{random file name}.dat""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {random file name} = "regsvr32.exe /s "%Program Data%\{random file name}.dat""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3
    • 2500 = "3"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • NoProtectedModeBanner = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • TabProcGrowth = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers
    • DefaultLevel = "262144"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers
    • TransparentEnabled = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers
    • PolicyScope = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers
    • ExecutableTypes = "ADE ADP BAS BAT CHM CMD COM CPL CRT EXE HLP HTA INF INS ISP LNK MDB MDE MSC MSI MSP MST OCX PCD PIF REG SCR SHS URL VB WSC"

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as BKDR_VAWTRAK.A. 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

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.

  • HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Safer\CodeIdentifiers\0\Paths


Did this description help? Tell us how we did.

Featured Stories

Connect with us on