Analysis by: Michael Jay Villanueva
 PLATFORM:

Windows

 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 arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages. It may be manually installed by a user.

It requires its main component to successfully perform its intended routine.

  TECHNICAL DETAILS

File Size: 18,432 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 17 Aug 2011

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.

It arrives as a component bundled with malware/grayware packages.

It may be manually installed by a user.

Installation

This hacking tool drops and executes the following files:

  • %User Temp%\{Random Numbers}.bat -> deleted after execution

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other Details

This hacking tool requires its main component to successfully perform its intended routine.

It does the following:

  • The dropped %User Temp%\{Random Numbers}.bat is capable of:
    • Executing these files:
      • %System%\Setup\OEM1.exe
      • %System%\Setup\OEM2.exe
      • %System%\oobe\html\oemreg\OEM3.exe
      • %System%\oobe\html\oemreg\OEM4.exe
    • Deleting the executed files
    • Executing this command: ping -n 2 127.1

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

  SOLUTION

Minimum Scan Engine: 9.800

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete these files

[ Learn More ]
There may be some files 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%\{Random Numbers}.bat

Step 4

Scan your computer with your Trend Micro product to delete files detected as HKTL_WPAKILL.GA. 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 5

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.

  • %System%\Setup\OEM1.exe
  • %System%\Setup\OEM2.exe
  • %System%\oobe\html\oemreg\OEM3.exe
  • %System%\oobe\html\oemreg\OEM4.exe


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