TROJ_NAVHELPER.A


 ALIASES:

BrowserModifier:Win32/NavExcel, BrowserModifier:Win32/NavExcel (Microsoft); [9.nsis]:NavHelper., [11.nsis\NHELPER.DLL]:NavHelper., [11.nsis\NHUNINSTALLER.EXE]:Generic PUP.z!gd. (McAfee); SecurityRisk.NavHelper (Symantec); AdWare.Win32.NavExcel.d (Kaspersky); NavExcel Search Toolbar (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:

518,591 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

17 Jun 2013

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:

  • %User Temp%\nsf5.tmp
  • %Program Files%\ProxyChecker
  • %Start Menu%\Programs\'WE' Group ProxyChecker
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links
  • %User Temp%\NavInst
  • %Program Files%\NavExcel
  • %Program Files%\NavExcel\NavHelper
  • %Program Files%\NavExcel\NavHelper\v2.0.4a

(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).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

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\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}

Other System Modifications

This Trojan deletes the following files:

  • %User Temp%\nsp1.tmp
  • %User Temp%\nsf5.tmp

(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.)

It adds the following registry keys:

HKEY_CURRENT_USER\Software\'WE' Group\
ProxyChecker

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
'WE' Group ProxyChecker

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\INSTALLING

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{710BCB5B-8C6C-483E-A4F5-FAF083B13184}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\NHelper.DLL

HKEY_CLASSES_ROOT\NavExcel.NavHelper.1

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NavExcel.NavHelper.1\CLSID

HKEY_CLASSES_ROOT\NavExcel.NavHelper

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NavExcel.NavHelper\CLSID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
NavExcel.NavHelper\CurVer

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\ProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\VersionIndependentProgID

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\Programmable

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\InprocServer32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0\
FLAGS

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0\
0

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0\
0\win32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0\
HELPDIR

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}\ProxyStubClsid

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}\ProxyStubClsid32

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}\TypeLib

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
NavHelper

It adds the following registry entries:

HKEY_CURRENT_USER\Software\'WE' Group\
ProxyChecker
InstallPath = "%Program Files%\ProxyChecker"

HKEY_CURRENT_USER\Software\'WE' Group\
ProxyChecker
Start Menu Folder = "'WE' Group ProxyChecker"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
'WE' Group ProxyChecker
DisplayName = "'WE' Group ProxyChecker"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
'WE' Group ProxyChecker
UninstallString = "%Program Files%\ProxyChecker\Uninstall.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
'WE' Group ProxyChecker
DisplayIcon = "%Program Files%\ProxyChecker\ProxyChecker.exe"

HKEY_CLASSES_ROOT
CLSID\{8FE54D14-E292-4023-7C99-FCF094DD0F40} = "Hasolik Soxasi"

HKEY_CURRENT_USER
Software\ASProtect\SpecData = "326E2AEA326E2AEA"

HKEY_CURRENT_USER\Software\ASProtect\
SpecData
326E2AEA326E2AEA = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
Source = "20040517bb"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
Current Version = "offline"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
InstallPath = "%User Temp%\NavInst"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
Install Version = "v2.0.4a"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
FolderPath = "%Program Files%"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a
v2.0.4a.cab = "v2.0.4a.cab"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a
NHUpdater.exe = "NHUpdater.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a
NHUninstaller.exe = "NHUninstaller.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a
NHelper.htm = "NHelper.htm"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper\v2.0.4a
NHelper.dll = "NHelper.dll"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\NHelper.DLL
AppID = "{710BCB5B-8C6C-483E-A4F5-FAF083B13184}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
AppID = "{710BCB5B-8C6C-483E-A4F5-FAF083B13184}"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}\TypeLib
Version = "1.0"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
CLSID = "{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
NavHelper
DisplayName = "NavHelper"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
NavHelper
UninstallString = "%Program Files%\NavExcel\NavHelper\v2.0.4a\NHUninstaller.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
NavHelper
HelpLink = "http://www.{BLOCKED}el.com/faqs.html"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
Update = "2000-04-05 12:00:00 AM"

HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\
NavHelper
Current Version = "v2.0.4a"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\nsf3.tmp
  • %User Temp%\nsf5.tmp\splash.bmp
  • %User Temp%\nsf5.tmp\advsplash.dll
  • %User Temp%\nsf5.tmp\ioSpecial.ini
  • %User Temp%\nsf5.tmp\modern-wizard.bmp
  • %User Temp%\nsf5.tmp\modern-header.bmp
  • %User Temp%\nsf5.tmp\InstallOptions.dll
  • %User Temp%\nsf5.tmp\StartMenu.dll
  • %Program Files%\ProxyChecker\proxychecker.exe
  • %Program Files%\ProxyChecker\ProxyCheckerHelp.chm
  • %Program Files%\ProxyChecker\Newsletter.url
  • %Program Files%\ProxyChecker\ColorTetris.ico
  • %Program Files%\ProxyChecker\ColorTetris.url
  • %Program Files%\ProxyChecker\Brickliner.ico
  • %Program Files%\ProxyChecker\Brickliner.url
  • %Program Files%\ProxyChecker\Krakout.ico
  • %Program Files%\ProxyChecker\Krakout.url
  • %Program Files%\ProxyChecker\KrakoutRE.ico
  • %Program Files%\ProxyChecker\KrakoutRE.url
  • %Program Files%\ProxyChecker\OpenIt.ico
  • %Program Files%\ProxyChecker\OpenIt.url
  • %Program Files%\ProxyChecker\Uninstall.exe
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Free Online Registration.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Home Page.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Help.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Subscribe to News.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\ColorTetris.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Brickliner.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Krakout.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Krakout RE.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\OpenIt.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Uninstall ProxyChecker.lnk
  • %User Temp%\NavInst\NHInstall.exe
  • %User Temp%\NavInst\NHManifest.txt
  • %User Temp%\NavInst\v2.0.4a.cab
  • %Program Files%\NavExcel\NavHelper\v2.0.4a\v2.0.4a.cab

(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).. %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista and 7.)

This report is generated via an automated analysis system.

  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

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\'WE' Group
    • ProxyChecker
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
    • 'WE' Group ProxyChecker
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel
    • NavHelper
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • INSTALLING
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • v2.0.4a
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {710BCB5B-8C6C-483E-A4F5-FAF083B13184}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • NHelper.DLL
  • In HKEY_CLASSES_ROOT
    • NavExcel.NavHelper.1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NavExcel.NavHelper.1
    • CLSID
  • In HKEY_CLASSES_ROOT
    • NavExcel.NavHelper
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NavExcel.NavHelper
    • CLSID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\NavExcel.NavHelper
    • CurVer
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • ProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • VersionIndependentProgID
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • Programmable
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib
    • {FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}
    • 1.0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0
    • FLAGS
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0
    • 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0\0
    • win32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\TypeLib\{FA4DE133-D3C3-4ED4-92D1-CD4DDE839AB3}\1.0
    • HELPDIR
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}
    • ProxyStubClsid
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}
    • ProxyStubClsid32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}
    • TypeLib
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • NavHelper

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\'WE' Group\ProxyChecker
    • InstallPath = "%Program Files%\ProxyChecker"
  • In HKEY_CURRENT_USER\Software\'WE' Group\ProxyChecker
    • Start Menu Folder = "'WE' Group ProxyChecker"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'WE' Group ProxyChecker
    • DisplayName = "'WE' Group ProxyChecker"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'WE' Group ProxyChecker
    • UninstallString = "%Program Files%\ProxyChecker\Uninstall.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\'WE' Group ProxyChecker
    • DisplayIcon = "%Program Files%\ProxyChecker\ProxyChecker.exe"
  • In HKEY_CLASSES_ROOT
    • CLSID\{8FE54D14-E292-4023-7C99-FCF094DD0F40} = "Hasolik Soxasi"
  • In HKEY_CURRENT_USER
    • Software\ASProtect\SpecData = "326E2AEA326E2AEA"
  • In HKEY_CURRENT_USER\Software\ASProtect\SpecData
    • 326E2AEA326E2AEA = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • Source = "20040517bb"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • Current Version = "offline"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • InstallPath = "%User Temp%\NavInst"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • Install Version = "v2.0.4a"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • FolderPath = "%Program Files%"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper\v2.0.4a
    • v2.0.4a.cab = "v2.0.4a.cab"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper\v2.0.4a
    • NHUpdater.exe = "NHUpdater.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper\v2.0.4a
    • NHUninstaller.exe = "NHUninstaller.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper\v2.0.4a
    • NHelper.htm = "NHelper.htm"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper\v2.0.4a
    • NHelper.dll = "NHelper.dll"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\NHelper.DLL
    • AppID = "{710BCB5B-8C6C-483E-A4F5-FAF083B13184}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}
    • AppID = "{710BCB5B-8C6C-483E-A4F5-FAF083B13184}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface\{20F36AF3-3486-4BB6-8BCB-F1F8ABE74D07}\TypeLib
    • Version = "1.0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • CLSID = "{C1E58A84-95B3-4630-B8C2-D06B77B7A0FC}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\NavHelper
    • DisplayName = "NavHelper"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\NavHelper
    • UninstallString = "%Program Files%\NavExcel\NavHelper\v2.0.4a\NHUninstaller.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\NavHelper
    • HelpLink = "http://www.{BLOCKED}el.com/faqs.html"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • Update = "2000-04-05 12:00:00 AM"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\NavExcel\NavHelper
    • Current Version = "v2.0.4a"

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%\nsf3.tmp
  • %User Temp%\nsf5.tmp\splash.bmp
  • %User Temp%\nsf5.tmp\advsplash.dll
  • %User Temp%\nsf5.tmp\ioSpecial.ini
  • %User Temp%\nsf5.tmp\modern-wizard.bmp
  • %User Temp%\nsf5.tmp\modern-header.bmp
  • %User Temp%\nsf5.tmp\InstallOptions.dll
  • %User Temp%\nsf5.tmp\StartMenu.dll
  • %Program Files%\ProxyChecker\proxychecker.exe
  • %Program Files%\ProxyChecker\ProxyCheckerHelp.chm
  • %Program Files%\ProxyChecker\Newsletter.url
  • %Program Files%\ProxyChecker\ColorTetris.ico
  • %Program Files%\ProxyChecker\ColorTetris.url
  • %Program Files%\ProxyChecker\Brickliner.ico
  • %Program Files%\ProxyChecker\Brickliner.url
  • %Program Files%\ProxyChecker\Krakout.ico
  • %Program Files%\ProxyChecker\Krakout.url
  • %Program Files%\ProxyChecker\KrakoutRE.ico
  • %Program Files%\ProxyChecker\KrakoutRE.url
  • %Program Files%\ProxyChecker\OpenIt.ico
  • %Program Files%\ProxyChecker\OpenIt.url
  • %Program Files%\ProxyChecker\Uninstall.exe
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Free Online Registration.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Home Page.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\ProxyChecker Help.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Subscribe to News.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\ColorTetris.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Brickliner.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Krakout.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\Krakout RE.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links\OpenIt.lnk
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Uninstall ProxyChecker.lnk
  • %User Temp%\NavInst\NHInstall.exe
  • %User Temp%\NavInst\NHManifest.txt
  • %User Temp%\NavInst\v2.0.4a.cab
  • %Program Files%\NavExcel\NavHelper\v2.0.4a\v2.0.4a.cab

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.
  • %User Temp%\nsf5.tmp
  • %Program Files%\ProxyChecker
  • %Start Menu%\Programs\'WE' Group ProxyChecker
  • %Start Menu%\Programs\'WE' Group ProxyChecker\Links
  • %User Temp%\NavInst
  • %Program Files%\NavExcel
  • %Program Files%\NavExcel\NavHelper
  • %Program Files%\NavExcel\NavHelper\v2.0.4a

Step 7

Scan your computer with your Trend Micro product to delete files detected as TROJ_NAVHELPER.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 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%\nsp1.tmp
  • %User Temp%\nsf5.tmp


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