COINMINER_MALXMR.TIDBFAR-WIN32

August 13, 2018
 Analysis by: Augusto II Remillano
 ALIASES:

BScope.Trojan.Miner, BScope.Trojan.Miner (VBA32), HEUR:RiskTool.Win32.BitCoinMiner.gen (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This Coinminer arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It uses the system's central processing unit (CPU) and/or graphical processing unit (GPU) resources to mine cryptocurrency.

  TECHNICAL DETAILS

File Size:

510,321 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

13 Aug 2018

Arrival Details

This Coinminer 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 Coinminer drops the following files:

  • antivirus_scan.exe
  • error.exe
  • start.bat

It creates the following folders:

  • %System Root%\ProgramWindows

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

Autostart Technique

This Coinminer modifies the following registry entry(ies) to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
wincheckingprocessor = "%System Root%\ProgramWindows\start.bat"

Other Details

This Coinminer connects to the following possibly malicious URL:

  • {BLOCKED}l.monero.{BLOCKED}ult.pro:3333

It uses the system's central processing unit (CPU) and/or graphical processing unit (GPU) resources to mine cryptocurrency. This behavior makes the system run abnormally slow.