TROJ_COINMINE.CYE

 Analysis by: John Anthony Banes

 ALIASES:

RiskTool.Win32.BitCoinMiner.hzkc (Kaspersky); Trojan:Win32/SvcMiner [non_writable_container] (Microsoft); Mal/Miner-C (Sophos Lite)

 PLATFORM:

Windows

 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:

1,766,362 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

12 May 2017

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 files:

  • %Windows%\Fonts\__tmp_rar_sfx_access_check_{random numbers}
  • %Windows%\Fonts\java.exe
  • %Windows%\Fonts\winlogon.exe

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

It drops and executes the following files:

  • %Windows%\Fonts\1.bat

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

Autostart Technique

This Trojan adds and runs the following services:

  • Display Name: Workstationt
    Binary Path Name: %Windows%\Fonts\java.exe
    Service Name: Workstationt

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

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.146.08

FIRST VSAPI PATTERN DATE:

09 Jan 2017

VSAPI OPR PATTERN File:

13.147.00

VSAPI OPR PATTERN Date:

10 Jan 2017

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

Restart in Safe Mode, and then 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.

  • HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Workstationt

Step 4

Search and delete this file

[ 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.
  • %Windows%\Fonts\__tmp_rar_sfx_access_check_{random numbers}
  • %Windows%\Fonts\java.exe
  • %Windows%\Fonts\winlogon.exe
  • %Windows%\Fonts\1.bat

Step 5

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_COINMINE.CYE. 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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