Analysis by: Ryan Paolo Maglaque

 ALIASES:

Trojan.Win64.BitMiner.iu(Kaspersky);PUA.Bitcoinminer(Norton);Win64/CoinMiner.BT(Eset-NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

This malware is a cryptocurrency mining malware discovered late August 2017 and found to be sporting fileless routines. Users affected by this malware may find their systems being used to mine cryptocurrency without their authorization.

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: 541,632 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 22 Jul 2017
Payload: Connects to URLs/IPs

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 adds the following mutexes to ensure that only one of its copies runs at any one time:

  • {431DD392-31C4-4F04-9DAC-9ABE935E0EA5}

Other Details

This Trojan connects to the following URL(s) to get the affected system's IP address:

  • http://www.pubyun.com/dyndns/getip

It does the following:

  • Checks for OS version
  • Connects to the following mining pools:
    • {BLOCKED}e.xmr-stak.net:3333
    • {BLOCKED}l.{BLOCKED}mr.com:5555
  • Connect to http://xmr.{BLOCKED}b.ru:8888/xmrok.txt to download a text file

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.570.04
FIRST VSAPI PATTERN DATE: 02 Aug 2017
VSAPI OPR PATTERN File: 13.571.00
VSAPI OPR PATTERN Date: 03 Aug 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

Scan your computer with your Trend Micro product to delete files detected as TROJ64_COINMINER.QO. 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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