ALIASES:

Yontoo (v) (Sunbelt)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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

File Size: 880,422 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 29 Nov 2012

Arrival Details

This Trojan 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 Trojan creates the following folders:

  • %System Root%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsx3.tmp
  • %User Temp%\nsh5.tmp
  • %User Temp%\C284AD06
  • %User Profile%\Application Data\Tarma Installer
  • %User Profile%\Tarma Installer\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Cache
  • %User Temp%\C284AD06\x86
  • %User Temp%\C284AD06\x64
  • %Program Files%\Yontoo Layers Client

(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.. %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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsc1.tmp
  • %User Temp%\nsx3.tmp
  • %User Temp%\nss4.tmp
  • %User Temp%\nsh5.tmp
  • %Program Files%\TSR6.tmp
  • %User Profile%\Application Data\TSR7.tmp
  • %Program Files%\TSR8.tmp
  • %User Profile%\Application Data\TSR9.tmp
  • %User Temp%\InstallHandler.txt

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\Classes\
DRPDD\CLSID

HKEY_LOCAL_MACHINE\Software\Classes\
CLSID\{80922ee0-8a76-46ae-95d5-bd3c3fe0708d}

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery\Active

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Recovery\AdminActive

HKEY_LOCAL_MACHINE\Software\Google

HKEY_LOCAL_MACHINE\Software\Google\
Chrome

HKEY_LOCAL_MACHINE\Software\Google\
Chrome\Extensions

HKEY_LOCAL_MACHINE\Software\Google\
Chrome\Extensions\niapdbllcanepiiimjjndipklodoedlc

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Components\{9D9785E5-3424-40B6-A287-BA143AD53109}

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Components\{B6783DFA-B8C8-4CB6-AB9F-EF1A1F7F7AE8}

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Components\{9307081B-7444-494C-8CF6-2FA7C0E92BFB}

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Components\{4E4AE263-5CE6-4307-84B6-B9BFF5729A44}

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Components\{3E454121-D681-4BBE-AC01-9D4DC40D2A04}

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}

HKEY_LOCAL_MACHINE\Software\Tarma Installer\
Products\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}

HKEY_LOCAL_MACHINE\Software\Classes\
CLSID\{FE9271F2-6EFD-44b0-A826-84C829536E93}

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Ext\
PreApproved\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{CFDAFE39-20CE-451D-BD45-A37452F39CF0}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\YontooIEClient.DLL

HKEY_CLASSES_ROOT\YontooIEClient.Api.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Api.1\CLSID

HKEY_CLASSES_ROOT\YontooIEClient.Api

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Api\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Api\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\TypeLib

HKEY_CLASSES_ROOT\YontooIEClient.Layers.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Layers.1\CLSID

HKEY_CLASSES_ROOT\YontooIEClient.Layers

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Layers\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
YontooIEClient.Layers\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\InProcServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\NumMethods

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\NumMethods

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\niapdbllcanepiiimjjndipklodoedlc
path = "%User Temp%\YontooLayers.crx"

HKEY_LOCAL_MACHINE\SOFTWARE\Google\
Chrome\Extensions\niapdbllcanepiiimjjndipklodoedlc
version = "1.0.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Components\{9D9785E5-3424-40B6-A287-BA143AD53109}
{889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Components\{B6783DFA-B8C8-4CB6-AB9F-EF1A1F7F7AE8}
{889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Components\{9307081B-7444-494C-8CF6-2FA7C0E92BFB}
{889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Components\{4E4AE263-5CE6-4307-84B6-B9BFF5729A44}
{889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Components\{3E454121-D681-4BBE-AC01-9D4DC40D2A04}
{889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
UninstallString = "%User Profile%\{889DF~1\Setup.exe /remove /q0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
QuietUninstallString = "%User Profile%\{889DF~1\Setup.exe /remove /q"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
ModifyPath = "%User Profile%\{889DF~1\Setup.exe /q0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
Version = "1a1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
VersionMajor = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
VersionMinor = "a"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
EstimatedSize = "2c7"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
Language = "49"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
TSAware = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
TinFolder = "%User Profile%\Tarma Installer\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
TinVersion = "5021"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
InstallDate = "20121128"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
InstallLocation = "%Program Files%\Yontoo Layers Client"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
InstallSource = "%User Temp%\nsh5.tmp"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
DisplayIcon = "%User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.ico"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
DisplayName = "Yontoo Layers Client 1.10.01"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
DisplayVersion = "1.10.01"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
Publisher = "Yontoo Technology, Inc."

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
URLInfoAbout = "http://www.{BLOCKED}o.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
Contact = "support@yontoo.com"

HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\
Products\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
TizPath = "%User Temp%\nsh5.tmp\drpdndls.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\YontooIEClient.DLL
AppID = "{CFDAFE39-20CE-451D-BD45-A37452F39CF0}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
NoExplorer = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\InProcServer32
ThreadingModel = "Both"

It deletes the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Internet Settings\
User Agent\Post Platform

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsc2.tmp
  • %User Temp%\nsx3.tmp\inetc.dll
  • %User Temp%\nsx3.tmp\tmp
  • %User Temp%\nsx3.tmp\nsDialogs.dll
  • %User Temp%\nsx3.tmp\bg.bmp
  • %User Temp%\nsx3.tmp\System.dll
  • %User Temp%\nsx3.tmp\PageRageLayers.exe
  • %User Temp%\nsh5.tmp\System.dll
  • %User Temp%\nsh5.tmp\drpdndls.exe
  • %User Temp%\nsh5.tmp\NSISdl.dll
  • %User Temp%\nsh5.tmp\regb
  • %User Temp%\drpdndls-0BE8.exe
  • %User Temp%\C284AD06.dat
  • %User Temp%\C284AD06\_Setup.dll
  • %User Temp%\C284AD06\Setup.ico
  • %User Temp%\C284AD06\_Setupx.dll
  • %User Temp%\YontooTix84781.log
  • %User Temp%\C284AD06\x86\regsvr32.exe
  • %User Temp%\C284AD06\x64\regsvr32.exe
  • %User Temp%\7za.exe._tm
  • %Program Files%\Yontoo Layers Client\YontooIEClient.dll._tm
  • %User Temp%\InstallHandler.txt.tmp
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.dat
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.exe
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\_Setup.dll
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.ico
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\_Setupx.dll

(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.. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).. %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.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://stats.{BLOCKED}d.com/tracking202/static/gpx_dd_noconv.php?textad=26
  • http://stats.{BLOCKED}d.com/tracking202/static/gpx_dd_noconv.php?textad=25
  • http://stats.{BLOCKED}d.com/InstallHandler.aspx?{random characters}

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine: 9.300

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Close all opened browser windows

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\Classes\DRPDD
    • CLSID
  • In HKEY_LOCAL_MACHINE\Software\Classes\CLSID
    • {80922ee0-8a76-46ae-95d5-bd3c3fe0708d}
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
    • Active
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Recovery
    • AdminActive
  • In HKEY_LOCAL_MACHINE\Software
    • Google
  • In HKEY_LOCAL_MACHINE\Software\Google
    • Chrome
  • In HKEY_LOCAL_MACHINE\Software\Google\Chrome
    • Extensions
  • In HKEY_LOCAL_MACHINE\Software\Google\Chrome\Extensions
    • niapdbllcanepiiimjjndipklodoedlc
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Components
    • {9D9785E5-3424-40B6-A287-BA143AD53109}
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Components
    • {B6783DFA-B8C8-4CB6-AB9F-EF1A1F7F7AE8}
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Components
    • {9307081B-7444-494C-8CF6-2FA7C0E92BFB}
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Components
    • {4E4AE263-5CE6-4307-84B6-B9BFF5729A44}
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Components
    • {3E454121-D681-4BBE-AC01-9D4DC40D2A04}
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B}
  • In HKEY_LOCAL_MACHINE\Software\Tarma Installer\Products
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B}
  • In HKEY_LOCAL_MACHINE\Software\Classes\CLSID
    • {FE9271F2-6EFD-44b0-A826-84C829536E93}
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Ext\PreApproved
    • {DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {CFDAFE39-20CE-451D-BD45-A37452F39CF0}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • YontooIEClient.DLL
  • In HKEY_CLASSES_ROOT
    • YontooIEClient.Api.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Api.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • YontooIEClient.Api
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Api
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Api
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}
    • TypeLib
  • In HKEY_CLASSES_ROOT
    • YontooIEClient.Layers.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Layers.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • YontooIEClient.Layers
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Layers
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\YontooIEClient.Layers
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {D372567D-67C1-4B29-B3F0-159B52B3E967}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{D372567D-67C1-4B29-B3F0-159B52B3E967}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {10DE7085-6A1E-4D41-A7BF-9AF93E351401}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {1AD27395-1659-4DFF-A319-2CFA243861A5}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {10DE7085-6A1E-4D41-A7BF-9AF93E351401}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}
    • InProcServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}
    • NumMethods
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}
    • NumMethods

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_LOCAL_MACHINE\SOFTWARE\Google\Chrome\Extensions\niapdbllcanepiiimjjndipklodoedlc
    • path = "%User Temp%\YontooLayers.crx"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Google\Chrome\Extensions\niapdbllcanepiiimjjndipklodoedlc
    • version = "1.0.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Components\{9D9785E5-3424-40B6-A287-BA143AD53109}
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Components\{B6783DFA-B8C8-4CB6-AB9F-EF1A1F7F7AE8}
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Components\{9307081B-7444-494C-8CF6-2FA7C0E92BFB}
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Components\{4E4AE263-5CE6-4307-84B6-B9BFF5729A44}
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Components\{3E454121-D681-4BBE-AC01-9D4DC40D2A04}
    • {889DF117-14D1-44EE-9F31-C5FB5D47F68B} = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • UninstallString = "%User Profile%\{889DF~1\Setup.exe /remove /q0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • QuietUninstallString = "%User Profile%\{889DF~1\Setup.exe /remove /q"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • ModifyPath = "%User Profile%\{889DF~1\Setup.exe /q0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • Version = "1a1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • VersionMajor = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • VersionMinor = "a"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • EstimatedSize = "2c7"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • Language = "49"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • TSAware = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • TinFolder = "%User Profile%\Tarma Installer\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • TinVersion = "5021"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • InstallDate = "20121128"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • InstallLocation = "%Program Files%\Yontoo Layers Client"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • InstallSource = "%User Temp%\nsh5.tmp"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • DisplayIcon = "%User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.ico"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • DisplayName = "Yontoo Layers Client 1.10.01"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • DisplayVersion = "1.10.01"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • Publisher = "Yontoo Technology, Inc."
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • URLInfoAbout = "http://www.{BLOCKED}o.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • Contact = "support@yontoo.com"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Tarma Installer\Products\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
    • TizPath = "%User Temp%\nsh5.tmp\drpdndls.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\YontooIEClient.DLL
    • AppID = "{CFDAFE39-20CE-451D-BD45-A37452F39CF0}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{DF7770F7-832F-4BDF-B144-100EDDD0C3AE}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{FD72061E-9FDE-484D-A58A-0BAB4151CAD8}
    • NoExplorer = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{1AD27395-1659-4DFF-A319-2CFA243861A5}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{10DE7085-6A1E-4D41-A7BF-9AF93E351401}\InProcServer32
    • ThreadingModel = "Both"

Step 5

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.
  • %User Temp%\nsc2.tmp
  • %User Temp%\nsx3.tmp\inetc.dll
  • %User Temp%\nsx3.tmp\tmp
  • %User Temp%\nsx3.tmp\nsDialogs.dll
  • %User Temp%\nsx3.tmp\bg.bmp
  • %User Temp%\nsx3.tmp\System.dll
  • %User Temp%\nsx3.tmp\PageRageLayers.exe
  • %User Temp%\nsh5.tmp\System.dll
  • %User Temp%\nsh5.tmp\drpdndls.exe
  • %User Temp%\nsh5.tmp\NSISdl.dll
  • %User Temp%\nsh5.tmp\regb
  • %User Temp%\drpdndls-0BE8.exe
  • %User Temp%\C284AD06.dat
  • %User Temp%\C284AD06\_Setup.dll
  • %User Temp%\C284AD06\Setup.ico
  • %User Temp%\C284AD06\_Setupx.dll
  • %User Temp%\YontooTix84781.log
  • %User Temp%\C284AD06\x86\regsvr32.exe
  • %User Temp%\C284AD06\x64\regsvr32.exe
  • %User Temp%\7za.exe._tm
  • %Program Files%\Yontoo Layers Client\YontooIEClient.dll._tm
  • %User Temp%\InstallHandler.txt.tmp
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.dat
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.exe
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\_Setup.dll
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Setup.ico
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\_Setupx.dll

Step 6

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%\DOCUME~1
  • %System Root%\DOCUME~1\Wilbert
  • %User Profile%\LOCALS~1
  • %User Temp%\nsx3.tmp
  • %User Temp%\nsh5.tmp
  • %User Temp%\C284AD06
  • %User Profile%\Application Data\Tarma Installer
  • %User Profile%\Tarma Installer\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}
  • %User Profile%\{889DF117-14D1-44EE-9F31-C5FB5D47F68B}\Cache
  • %User Temp%\C284AD06\x86
  • %User Temp%\C284AD06\x64
  • %Program Files%\Yontoo Layers Client

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_DLOADER.GIW. 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 8

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.

  • %User Temp%\nsc1.tmp
  • %User Temp%\nsx3.tmp
  • %User Temp%\nss4.tmp
  • %User Temp%\nsh5.tmp
  • %Program Files%\TSR6.tmp
  • %User Profile%\Application Data\TSR7.tmp
  • %Program Files%\TSR8.tmp
  • %User Profile%\Application Data\TSR9.tmp
  • %User Temp%\InstallHandler.txt

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\Windows\CurrentVersion\Internet Settings\User Agent
    • Post Platform


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