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HKTL_CHANGEKEY

January 14, 2014
 Analysis by: Rika Joi Gregorio
 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:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Hacking Tool

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This hacking tool may be dropped by other malware. It may be manually installed by a user.

  TECHNICAL DETAILS

File Size:

973,556 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

03 Sep 2013

Arrival Details

This hacking tool may be dropped by other malware.

It may be manually installed by a user.

Installation

This hacking tool drops the following files:

  • %All Users Profile%\Application Data\Office Genuine Advantage\data\data.dat
  • %All Users Profile%\Application Data\Windows Genuine Advantage\data\data.dat
  • %All Users Profile%\Application Data\Microsoft\Crypto\RSA\MachineKeys\{random}

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

It creates the following folders:

  • %All Users Profile%\Application Data\Office Genuine Advantage
  • %All Users Profile%\Application Data\Office Genuine Advantage\data
  • %All Users Profile%\Application Data\Windows Genuine Advantage
  • %All Users Profile%\Application Data\Windows Genuine Advantage\data
  • %All Users Profile%\Application Data\Microsoft\Crypto
  • %All Users Profile%\Application Data\Microsoft\Crypto\RSA
  • %All Users Profile%\Application Data\Microsoft\Crypto\RSA\S-1-5-21-{random digits}

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

Other System Modifications

This hacking tool adds the following registry keys:

HKEY_CURRENT_USER\Software\WinRAR SFX

HKEY_CURRENT_USER\Software\Microsoft\
Windows Genuine Advantage

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\WgaLogon

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon\
Notify\WgaLogon\Settings

It adds the following registry entries:

HKEY_CURRENT_USER\Software\WinRAR SFX
{System Root Letter}%% = "%System Root%"

HKEY_CURRENT_USER\Software\Microsoft\
Windows Genuine Advantage
id = "{2CFF104F-1FF3-4D65-9201-B24F86E23A37}"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion
ProductId = "{new product ID}"

(Note: The default value data of the said registry entry is {original product ID}.)

HOSTS File Modification

This hacking tool adds the following strings to the Windows HOSTS file:

  • #block wga
  • 127.0.0.1 mpa.one.microsoft.com

NOTES:
This hacking tool is used to change the product key of a machine.