TROJ_BITCOIN.HJS

March 11, 2013
 Analysis by: Mark Joseph Manahan
 ALIASES:

Win32/CoinMiner.BN trojan (Eset), Trojan.Coinbitminer (Symantec), RDN/Generic.grp!s (McAfee)

 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:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan may be dropped by other malware.

  TECHNICAL DETAILS

File Size:

133,120 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Mar 2013

Arrival Details

This Trojan may be dropped by other malware.

Installation

This Trojan adds the following folders:

  • %Application Data%\torrent

(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.)

It drops the following component file(s):

  • %Application Data%\torrent\alcc.exe
  • %Application Data%\torrent\diablo121016.cl
  • %Application Data%\torrent\diakgcn121016.cl
  • %Application Data%\torrent\libcurl-4.dll
  • %Application Data%\torrent\libeay32.dll
  • %Application Data%\torrent\libidn-11.dll
  • %Application Data%\torrent\liblnx.cl
  • %Application Data%\torrent\libpdcurses.dll
  • %Application Data%\torrent\libusb-1.0.dll
  • %Application Data%\torrent\NwTray.exe
  • %Application Data%\torrent\phatk121016.cl
  • %Application Data%\torrent\poclbm121016.cl
  • %Application Data%\torrent\pthreadGC2.dll
  • %Application Data%\torrent\ssleay32.dll
  • %Application Data%\torrent\zlib1.dll

(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 Trojan adds the following registry entries to enable its automatic execution at every system startup:

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

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}2.{BLOCKED}emc.com:8337
  • http://{BLOCKED}l.{BLOCKED}c.com:8332

  SOLUTION

Minimum Scan Engine:

9.300

VSAPI OPR PATTERN File:

9.773.00

VSAPI OPR PATTERN Date:

08 Mar 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

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 3

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%\torrent

Step 4

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