TROJ_BITCOIN.YYXD

February 27, 2014
 Analysis by: Rika Joi Gregorio
 ALIASES:

Win32/CoinMiner.LJ trojan(Eset)

 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Trojan 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:

81,920 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

17 Feb 2014

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • %User Profile%\Application Data\vmware-unity.exe

(Note: %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.)

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
vmware-unity = "%User Profile%\Application Data\vmware-unity.exe"

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CURRENT_USER\Software\{CD3EF1B7-E0DA-4510-951E-A3DBC6D893FC}

It adds the following registry entries:

HKEY_CURRENT_USER\Software\{CD3EF1B7-E0DA-4510-951E-A3DBC6D893FC}
Client = "{random values}"

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}gangapreacher.ru
  • {BLOCKED}chdeepdown.ru
  • {BLOCKED}hooptudokoowh.ru
  • {BLOCKED}shoozoxoachic.ru
  • {BLOCKED}tyshehoaboochu.ru/gate.php
  • {BLOCKED}.{BLOCKED}.52.42:9327

  SOLUTION

Minimum Scan Engine:

9.700

FIRST VSAPI PATTERN FILE:

10.626.06

FIRST VSAPI PATTERN DATE:

25 Feb 2014

VSAPI OPR PATTERN File:

10.627.00

VSAPI OPR PATTERN Date:

25 Feb 2014

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

Scan your computer with your Trend Micro product and note files detected as TROJ_BITCOIN.YYXD

Step 3

Terminate a process file/s detected as TROJ_BITCOIN.YYXD

[ Learn More ]

*Note: If the detected file/s is/are not displayed in theWindows Task Manager, continue doing the next steps.

Step 4

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.

  • In HKEY_CURRENT_USER\Software
    • {CD3EF1B7-E0DA-4510-951E-A3DBC6D893FC}

Step 5

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
    • vmware-unity = "%Application Data%\vmware-unity.exe"

Step 6

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