HKTL_CRACKN
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Hacking Tool
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This hacking tool 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
Arrival Details
This hacking tool 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 hacking tool creates the following folders:
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- %User Temp%\nsj3.tmp
- %Program Files%\Ncrack
- %Program Files%\Ncrack\lists
(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).)
Other System Modifications
This hacking tool deletes the following files:
- %User Temp%\nst1.tmp
- %User Temp%\nsj3.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\Ncrack
HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
Ncrack
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Ncrack
DisplayName = "Ncrack 0.2ALPHA"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Ncrack
UninstallString = "%Program Files%\Ncrack\uninstall.exe "
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Ncrack
NoModify = "1"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Ncrack
NoRepair = "1"
It modifies the following registry entries:
HKEY_CURRENT_USER\Environment
PATH = "%Program Files%\Ncrack"
(Note: The default value data of the said registry entry is %Program Files%\Microsoft Visual Studio\Common\Tools\WinNT;%Program Files%\Microsoft Visual Studio\Common\MSDev98\Bin;%Program Files%\Microsoft Visual Studio\Common\Tools;%Program Files%\Microsoft Visual Studio\VC98\bin.)
Dropping Routine
This hacking tool drops the following files:
- %User Temp%\nsj3.tmp\final.ini
- %Program Files%\Ncrack\COPYING
- %Program Files%\Ncrack\lists\common.usr
- %Program Files%\Ncrack\lists\default.pwd
- %Program Files%\Ncrack\lists\default.usr
- %Program Files%\Ncrack\lists\jtr.pwd
- %Program Files%\Ncrack\lists\minimal.usr
- %Program Files%\Ncrack\lists\myspace.pwd
- %Program Files%\Ncrack\lists\phpbb.pwd
- %Program Files%\Ncrack\lists\top50000.pwd
- %Program Files%\Ncrack\ncrack-services
- %Program Files%\Ncrack\ncrack.exe
- %Program Files%\Ncrack\libeay32.dll
- %Program Files%\Ncrack\ssleay32.dll
- %Program Files%\Ncrack\Uninstall.exe
- %User Temp%\nsj3.tmp\InstallOptions.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).)
This report is generated via an automated analysis system.
SOLUTION
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
Delete this registry key
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
- Ncrack
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall
- Ncrack
Step 3
Delete this registry value
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\Uninstall\Ncrack
- DisplayName = "Ncrack 0.2ALPHA"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Ncrack
- UninstallString = "%Program Files%\Ncrack\uninstall.exe "
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Ncrack
- NoModify = "1"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Ncrack
- NoRepair = "1"
Step 4
Restore these modified registry values
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\Environment
- From: PATH = "%Program Files%\Ncrack"
To: PATH = ""%Program Files%\Microsoft Visual Studio\Common\Tools\WinNT;%Program Files%\Microsoft Visual Studio\Common\MSDev98\Bin;%Program Files%\Microsoft Visual Studio\Common\Tools;%Program Files%\Microsoft Visual Studio\VC98\bin""
- From: PATH = "%Program Files%\Ncrack"
Step 5
Search and delete these components
- %User Temp%\nsj3.tmp\final.ini
- %Program Files%\Ncrack\COPYING
- %Program Files%\Ncrack\lists\common.usr
- %Program Files%\Ncrack\lists\default.pwd
- %Program Files%\Ncrack\lists\default.usr
- %Program Files%\Ncrack\lists\jtr.pwd
- %Program Files%\Ncrack\lists\minimal.usr
- %Program Files%\Ncrack\lists\myspace.pwd
- %Program Files%\Ncrack\lists\phpbb.pwd
- %Program Files%\Ncrack\lists\top50000.pwd
- %Program Files%\Ncrack\ncrack-services
- %Program Files%\Ncrack\ncrack.exe
- %Program Files%\Ncrack\libeay32.dll
- %Program Files%\Ncrack\ssleay32.dll
- %Program Files%\Ncrack\Uninstall.exe
- %User Temp%\nsj3.tmp\InstallOptions.dll
Step 6
Search and delete these folders
- %System Root%\DOCUME~1
- %System Root%\DOCUME~1\Wilbert
- %User Profile%\LOCALS~1
- %User Temp%\nsj3.tmp
- %Program Files%\Ncrack
- %Program Files%\Ncrack\lists
Step 7
Scan your computer with your Trend Micro product to delete files detected as HKTL_CRACKN. 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%\nst1.tmp
- %User Temp%\nsj3.tmp
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