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TSPY_ZBOT.YNU

May 30, 2014
 ALIASES:

Mal/MalitRar-B (Sophos)

 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • Threat Type: Spyware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

It disables Task Manager, Registry Editor, and Folder Options.

  TECHNICAL DETAILS

File Size:

984,899 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

22 May 2014

Arrival Details

This spyware 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 spyware creates the following folders:

  • %System Root%\Documents and Settings\Wilbert
  • %User Profile%\3qjj3982x512z7u
  • %System%\install
  • %User Profile%\Application Data\68AD0FD0

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Intel(R) HD Graphics = "%System%\install\rcg.exe"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Intel(R) HD Graphics = "%System%\install\rcg.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}
StubPath = "%System%\install\rcg.exe Restart"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}
StubPath = "%System%\install\rcg.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run

HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}

HKEY_CURRENT_USER\SOFTWARE\NEW

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\MediaResources\msvideo

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
Intel(R) HD Graphics = "%System%\install\rcg.exe"

HKEY_CURRENT_USER\Software\NEW
FirstExecution = "21/05/2014 -- 02:03"

HKEY_CURRENT_USER\Software\NEW
NewIdentification = "NEW"

HKEY_CURRENT_USER\Software\NEW
NewGroup = [REG_EXPAND_SZ, value: ]

It creates the following registry entry(ies) to disable Task Manager, Registry Tools and Folder Options:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer\Run
Intel(R) HD Graphics = "%System%\install\rcg.exe"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}

Dropping Routine

This spyware drops the following files:

  • __tmp_rar_sfx_access_check_66593
  • vbvps.KYM
  • tgYIaqD.exe
  • biIFEaIzMBX.ACG
  • TEUCoxvSJ.LWU
  • %User Temp%\Wilbert2.txt
  • %System Root%\default.html
  • %User Profile%\68AD0FD0\ak.tmp
  • %User Temp%\Wilbert7
  • %User Temp%\Wilbert8
  • %User Profile%\Application Data\Wilbertv3.4.2.2.vbs
  • %System%\install\rcg.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)

Other Details

This spyware connects to the following possibly malicious URL:

  • {BLOCKED}.201.103

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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

Enable Registry Editor, Task Manager, and Folder options

[ Learn More ]
By doing this step, you also enable other applications/programs disabled by this malware/grayware/spyware.

Step 4

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_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • Run
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
    • {8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}
  • In HKEY_CURRENT_USER\SOFTWARE
    • NEW
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MediaResources
    • msvideo

Step 5

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Intel(R) HD Graphics = "%System%\install\rcg.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Intel(R) HD Graphics = "%System%\install\rcg.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}
    • StubPath = "%System%\install\rcg.exe Restart"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}
    • StubPath = "%System%\install\rcg.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
    • Intel(R) HD Graphics = "%System%\install\rcg.exe"
  • In HKEY_CURRENT_USER\Software\NEW
    • FirstExecution = "21/05/2014 -- 02:03"
  • In HKEY_CURRENT_USER\Software\NEW
    • NewIdentification = "NEW"
  • In HKEY_CURRENT_USER\Software\NEW
    • NewGroup = [REG_EXPAND_SZ, value: ]

Step 6

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • __tmp_rar_sfx_access_check_66593
  • vbvps.KYM
  • tgYIaqD.exe
  • biIFEaIzMBX.ACG
  • TEUCoxvSJ.LWU
  • %User Temp%\Wilbert2.txt
  • %System Root%\default.html
  • %User Profile%\68AD0FD0\ak.tmp
  • %User Temp%\Wilbert7
  • %User Temp%\Wilbert8
  • %User Profile%\Application Data\Wilbertv3.4.2.2.vbs
  • %System%\install\rcg.exe

Step 7

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %System Root%\Documents and Settings\Wilbert
  • %User Profile%\3qjj3982x512z7u
  • %System%\install
  • %User Profile%\Application Data\68AD0FD0

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.YNU. 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 9

Restore these deleted registry keys/values from backup

*Note: Only Microsoft-related keys/values will be restored. If the malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.

  • In HKEY_CURRENT_USER\Software\Microsoft\Active Setup\Installed Components
    • {8TRM1VU3-DB2D-LP1A-666O-0C3U8M405L13}


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