WORM_BRONTOK.NA


 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm 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:

87,040 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

07 Dec 2013

Arrival Details

This worm 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 worm creates the following folders:

  • %Application Data%\WINDOWS

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

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
tiwi = "%Windows%\tiwi"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MSMSGS = "%Application Data%\WINDOWS\winlogon.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
LogonWilbert = "%Application Data%\WINDOWS\imoet.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
System Monitoring = "%Application Data%\WINDOWS\cute.exe"

It modifies the following registry entries to ensure it automatic execution at every system startup:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe %System%\IExplorer.exe"

(Note: The default value data of the said registry entry is Explorer.exe.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = "%System%\userinit.exe,%System%\IExplorer.exe"

(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)

Other System Modifications

This worm deletes the following files:

  • %Application Data%\smss.exe
  • %Application Data%\winlogon.exe
  • %Temp%\scs1F.tmp
  • %Temp%\scs30.tmp
  • %Temp%\scs1D.tmp
  • %Temp%\scs31.tmp
  • %Temp%\scs1A.tmp
  • %Temp%\scs2C.tmp
  • %Temp%\scs1B.tmp
  • %Temp%\scs2D.tmp
  • %Temp%\scs26.tmp
  • %Temp%\scs2A.tmp
  • %Temp%\scs52.tmp
  • %Temp%\scs58.tmp
  • %Temp%\scs54.tmp
  • %Temp%\scs5A.tmp
  • %Temp%\scs60.tmp
  • %Temp%\scs64.tmp
  • %Temp%\scs5E.tmp
  • %Temp%\scs67.tmp
  • %Temp%\scs6A.tmp
  • %Temp%\scs6D.tmp

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)

It adds the following registry keys:

HKEY_CLASSES_ROOT\lnkfile\shell\
open\command

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Windows Title = "Princess Tiwi is Here.."

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\shell32.dll,-9728 = "Tiwi"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\shell32.dll,-9218 = "Tiwi"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\shell32.dll,-9104 = "Tiwi Imoet"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@shell32.dll,-30503 = "Tiwi Imoet"

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
inffile\shell\Install\
command
Default = "%Windows%\win\system\host32.exe /ShowErrorINF"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
DisableCMD = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
DisableConfig = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows NT\SystemRestore
DisableSR = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Installer
LimitSystemRestoreCheckpointing = "1"

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Microsoft\Windows\Installer
DisableMSI = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Start_ShowControlPanel = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
NoDispSettingsPage = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CabinetState
FullPathAddress = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

It modifies the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
SCRNSAVE.EXE = "%System%\tiwi.SCR"

(Note: The default value data of the said registry entry is %Windows%\system32\logon.scr.)

HKEY_CURRENT_USER\Control Panel\Desktop
ScreenSaverIsSecure = "0"

(Note: The default value data of the said registry entry is 0.)

HKEY_CURRENT_USER\Control Panel\Desktop
ScreenSaveTimeOut = "600"

(Note: The default value data of the said registry entry is 600.)

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\SafeBoot
AlternateShell = "%Windows%\tiwi.exe"

(Note: The default value data of the said registry entry is cmd.exe.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\AeDebug
Debugger = "%System%\Shell.exe"

(Note: The default value data of the said registry entry is "%Program Files%\Microsoft Visual Studio\Common\MSDev98\Bin\msdev.exe" -p %ld -e %ld.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\AeDebug
Auto = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
RegisteredOwner = "Tiwi_Cute"

(Note: The default value data of the said registry entry is user00.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
RegisteredOrganization = "Tiwi_Imoet"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ProductID = "U must be use ilegal os, so what?"

(Note: The default value data of the said registry entry is 76487-640-0059266-23340.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ProductName = "Princess Tiwi"

(Note: The default value data of the said registry entry is Microsoft Windows XP.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
LegalNoticeCaption = "Cemlekum"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
LegalNoticeText = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Start Page = "http://www.{BLOCKED}e.com"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome.)

HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Search Page = "http://www.{BLOCKED}e.com"

(Note: The default value data of the said registry entry is http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch.)

HKEY_CURRENT_USER\Control Panel\International
s1159 = "Tiwi"

(Note: The default value data of the said registry entry is AM.)

HKEY_CURRENT_USER\Control Panel\International
s2359 = "Tiwi"

(Note: The default value data of the said registry entry is PM.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}
LocalizedString = "Tiwi_Cute"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{645FF040-5081-101B-9F08-00AA002F954E}
LocalizedString = "Tiwi Suka Bersih2"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\SHELL32.dll,-9227 = "Tiwi's Document"

(Note: The default value data of the said registry entry is My Documents.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\SHELL32.dll,-9217 = "Tiwi's Network"

(Note: The default value data of the said registry entry is My Network Places.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\SHELL32.dll,-9216 = "Tiwi"

(Note: The default value data of the said registry entry is My Computer.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\ShellNoRoam\MUICache
@C:\WINDOWS\system32\SHELL32.dll,-8964 = "Tiwi Suka Bersih2"

(Note: The default value data of the said registry entry is Recycle Bin.)

HKEY_CURRENT_USER\Control Panel\Mouse
SwapMouseButtons = "1"

(Note: The default value data of the said registry entry is 0.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
HideFileExt = "1"

(Note: The default value data of the said registry entry is 1.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = "0"

(Note: The default value data of the said registry entry is 2.)

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableTaskMgr = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFolderOptions = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoTrayContextMenu = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoFind = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoSetFolders = "1"

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoRun = "1"

Dropping Routine

This worm drops the following files:

  • %System Root%\present.txt
  • %System Root%\autorun.inf
  • %Application Data%\smss.exe
  • %Application Data%\winlogon.exe
  • %Windows%\tiwi.exe
  • %System Root%\tiwi.exe
  • %System%\shell.exe
  • %System%\tiwi.scr
  • %System%\IExplorer.exe
  • %Common Startup%\Empty.pif
  • %Application Data%\WINDOWS\winlogon.exe
  • %Application Data%\WINDOWS\imoet.exe
  • %Application Data%\WINDOWS\cute.exe
  • %Application Data%\WINDOWS\smss.exe
  • %System Root%\Tiwi_Cute.exe
  • %System Root%\Data_Rahasia Wilbert.exe

(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.. %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.)

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

Identify and delete files detected as WORM_BRONTOK.NA using either the Startup Disk or Recovery Console

[ 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_CLASSES_ROOT\lnkfile\shell\open
    • command
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
    • System
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT
    • SystemRestore

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • tiwi = "%Windows%\tiwi"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • MSMSGS = "%Application Data%\WINDOWS\winlogon.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • LogonWilbert = "%Application Data%\WINDOWS\imoet.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • System Monitoring = "%Application Data%\WINDOWS\cute.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • Windows Title = "Princess Tiwi is Here.."
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • @C:\WINDOWS\system32\shell32.dll,-9728 = "Tiwi"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • @C:\WINDOWS\system32\shell32.dll,-9218 = "Tiwi"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • @C:\WINDOWS\system32\shell32.dll,-9104 = "Tiwi Imoet"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • @shell32.dll,-30503 = "Tiwi Imoet"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\inffile\shell\Install\command
    • Default = "%Windows%\win\system\host32.exe /ShowErrorINF"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • DisableCMD = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore
    • DisableConfig = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore
    • DisableSR = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer
    • LimitSystemRestoreCheckpointing = "1"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\Installer
    • DisableMSI = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • Start_ShowControlPanel = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • NoDispSettingsPage = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CabinetState
    • FullPathAddress = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • ShowSuperHidden = "0"

Step 6

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • From: SCRNSAVE.EXE = "%System%\tiwi.SCR"
      To: SCRNSAVE.EXE = ""%Windows%\system32\logon.scr""
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • From: ScreenSaverIsSecure = "0"
      To: ScreenSaverIsSecure = ""0""
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • From: ScreenSaveTimeOut = "600"
      To: ScreenSaveTimeOut = ""600""
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\SafeBoot
    • From: AlternateShell = "%Windows%\tiwi.exe"
      To: AlternateShell = ""cmd.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug
    • From: Debugger = "%System%\Shell.exe"
      To: Debugger = """%Program Files%\Microsoft Visual Studio\Common\MSDev98\Bin\msdev.exe" -p %ld -e %ld""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug
    • From: Auto = "1"
      To: Auto = ""0""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • From: RegisteredOwner = "Tiwi_Cute"
      To: RegisteredOwner = ""user00""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • RegisteredOrganization = "Tiwi_Imoet"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • From: ProductID = "U must be use ilegal os, so what?"
      To: ProductID = ""76487-640-0059266-23340""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion
    • From: ProductName = "Princess Tiwi"
      To: ProductName = ""Microsoft Windows XP""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • LegalNoticeCaption = "Cemlekum"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • LegalNoticeText = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Start Page = "http://www.{BLOCKED}e.com"
      To: Start Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&pver=6&ar=msnhome""
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
    • From: Search Page = "http://www.{BLOCKED}e.com"
      To: Search Page = ""http://www.microsoft.com/isapi/redir.dll?prd=ie&ar=iesearch""
  • In HKEY_CURRENT_USER\Control Panel\International
    • From: s1159 = "Tiwi"
      To: s1159 = ""AM""
  • In HKEY_CURRENT_USER\Control Panel\International
    • From: s2359 = "Tiwi"
      To: s2359 = ""PM""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{20D04FE0-3AEA-1069-A2D8-08002B30309D}
    • From: LocalizedString = "Tiwi_Cute"
      To: LocalizedString = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID\{645FF040-5081-101B-9F08-00AA002F954E}
    • From: LocalizedString = "Tiwi Suka Bersih2"
      To: LocalizedString = ""{random values}""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • From: @C:\WINDOWS\system32\SHELL32.dll,-9227 = "Tiwi's Document"
      To: @C:\WINDOWS\system32\SHELL32.dll,-9227 = ""My Documents""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • From: @C:\WINDOWS\system32\SHELL32.dll,-9217 = "Tiwi's Network"
      To: @C:\WINDOWS\system32\SHELL32.dll,-9217 = ""My Network Places""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • From: @C:\WINDOWS\system32\SHELL32.dll,-9216 = "Tiwi"
      To: @C:\WINDOWS\system32\SHELL32.dll,-9216 = ""My Computer""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\ShellNoRoam\MUICache
    • From: @C:\WINDOWS\system32\SHELL32.dll,-8964 = "Tiwi Suka Bersih2"
      To: @C:\WINDOWS\system32\SHELL32.dll,-8964 = ""Recycle Bin""
  • In HKEY_CURRENT_USER\Control Panel\Mouse
    • From: SwapMouseButtons = "1"
      To: SwapMouseButtons = ""0""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: HideFileExt = "1"
      To: HideFileExt = ""1""
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • From: Hidden = "0"
      To: Hidden = ""2""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Shell = "Explorer.exe %System%\IExplorer.exe"
      To: Shell = ""Explorer.exe""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • From: Userinit = "%System%\userinit.exe,%System%\IExplorer.exe"
      To: Userinit = ""%Windows%\system32\userinit.exe,""

Step 7

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.
  • %System Root%\present.txt
  • %System Root%\autorun.inf
  • %Application Data%\smss.exe
  • %Application Data%\winlogon.exe
  • %Windows%\tiwi.exe
  • %System Root%\tiwi.exe
  • %System%\shell.exe
  • %System%\tiwi.scr
  • %System%\IExplorer.exe
  • %Common Startup%\Empty.pif
  • %Application Data%\WINDOWS\winlogon.exe
  • %Application Data%\WINDOWS\imoet.exe
  • %Application Data%\WINDOWS\cute.exe
  • %Application Data%\WINDOWS\smss.exe
  • %System Root%\Tiwi_Cute.exe
  • %System Root%\Data_Rahasia Wilbert.exe

Step 8

Search and delete this folder

[ 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.
  • %Application Data%\WINDOWS

Step 9

Scan your computer with your Trend Micro product to delete files detected as WORM_BRONTOK.NA. 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 10

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.

  • %Application Data%\smss.exe
  • %Application Data%\winlogon.exe
  • %Temp%\scs1F.tmp
  • %Temp%\scs30.tmp
  • %Temp%\scs1D.tmp
  • %Temp%\scs31.tmp
  • %Temp%\scs1A.tmp
  • %Temp%\scs2C.tmp
  • %Temp%\scs1B.tmp
  • %Temp%\scs2D.tmp
  • %Temp%\scs26.tmp
  • %Temp%\scs2A.tmp
  • %Temp%\scs52.tmp
  • %Temp%\scs58.tmp
  • %Temp%\scs54.tmp
  • %Temp%\scs5A.tmp
  • %Temp%\scs60.tmp
  • %Temp%\scs64.tmp
  • %Temp%\scs5E.tmp
  • %Temp%\scs67.tmp
  • %Temp%\scs6A.tmp
  • %Temp%\scs6D.tmp


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