HKTL_BITCOINMINER

 Analysis by: Nikko Tamana

 ALIASES:

Riskware/Java_BitCoinMiner (Fortinet), RiskTool.Win32.BitCoinMiner (Ikarus), RiskTool.Java.BitCoinMiner.a (Kaspersky), Trojan:Win32/Dotimorn (Microsoft)

 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:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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.

  TECHNICAL DETAILS

File Size:

1,610,284 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

24 Feb 2013

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 drops the following file(s)/component(s):

  • %Application Data%\torrent\alcc.exe
  • %Application Data%\torrent\diablo121016.cl
  • %Application Data%\torrent\diakgcn121016.cl
  • %Application Data%\torrent\libcurl.dll
  • %Application Data%\torrent\libeay32.dll
  • %Application Data%\torrent\libidn-11.dll
  • %Application Data%\torrent\liblnx.cl
  • %Application Data%\torrent\librtmp.dll
  • %Application Data%\torrent\libssh2.dll
  • %Application Data%\torrent\libusb-1.0.dll
  • %Application Data%\torrent\NwTray.exe
  • %Application Data%\torrent\OpenCL.dll
  • %Application Data%\torrent\phatk121016.cl
  • %Application Data%\torrent\poclbm121016.cl
  • %Application Data%\torrent\ssleay32.dll
  • %Application Data%\torrent\zlib1.dll

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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.)

It creates the following folders:

  • %Application Data%\torrent

(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming 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 System Modifications

This hacking tool adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
NwTray = ""%Application Data%\torrent\NwTray.exe""

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

HKEY_CURRENT_USER\Software\WinRAR SFX
%Application Data%%torrent = "%Application Data%\torrent"

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\WinRAR SFX

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

  SOLUTION

Minimum Scan Engine:

9.300

SSAPI PATTERN File:

1.379.01

SSAPI PATTERN Date:

24 Feb 2013

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

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.
  • %Application Data%\torrent

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CURRENT_USER\Software
    • WinRAR SFX
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
    • System

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\Microsoft\Windows\CurrentVersion\Run
    • NwTray = ""%Application Data%\torrent\NwTray.exe""

Step 5

Scan your computer with your Trend Micro product to delete files detected as HKTL_BITCOINMINER. 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.


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