COINMINER_COINHIVE.SMF-JS

June 19, 2018
 Analysis by: John Anthony Banes
 Modified by: Johnlery Triunfante
 ALIASES:

Riskware/CoinHive (Fortinet); Application.CoinMiner.AY (BitDefender)

 PLATFORM:

Windows

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Coinminer may be hosted on a website and run when a user accesses the said website.

This malicious script runs on web browsers, which may be installed on any operating system.

  TECHNICAL DETAILS

File Size:

18,312 bytes

File Type:

JS, HTML, HTM

Memory Resident:

Yes

Initial Samples Received Date:

15 May 2018

Payload:

Connects to URLs/IPs

Arrival Details

This Coinminer may be hosted on a website and run when a user accesses the said website.

Other Details

This Coinminer does the following:

  • This JavaScript is embedded into websites to run a miner for Monero cryptocurrency.
  • It uses the system's central processing unit (CPU) resources to mine for cryptocurrency.
  • This coinminer checks either of the following before it runs its coinminer:
    • WebAssembly
    • asm.js
  • The script accepts the following relevant parameters:
    • Target number of mining threads per tab
    • Throttle rate
    • Execution / start - mode
    • Target number of hashes to solve
  • It can have the following start modes:
    • IF_EXCLUSIVE_TAB - The miner will only start if no other tabs are already mining.
    • FORCE_EXCLUSIVE_TAB - The miner will always start and immediately kill all miners in other tabs that have not specified CoinHive.FORCE_MULTI_TAB.
    • FORCE_MULTI_TAB - The miner will always start.
  • It has the capability to monitor the following events:
    • open
    • authed
    • close
    • error
    • job
    • found
    • accepted
    • optin
    • wss://ws001.{BLOCKED}ve.com/proxy
    • wss://ws002.{BLOCKED}ve.com/proxy
    • wss://ws003.{BLOCKED}ve.com/proxy
    • wss://ws004.{BLOCKED}ve.com/proxy
    • wss://ws005.{BLOCKED}ve.com/proxy
    • wss://ws006.{BLOCKED}ve.com/proxy
    • wss://ws007.{BLOCKED}ve.com/proxy
    • wss://ws008.{BLOCKED}ve.com/proxy
    • wss://ws009.{BLOCKED}ve.com/proxy
    • wss://ws010.{BLOCKED}ve.com/proxy
    • wss://ws011.{BLOCKED}ve.com/proxy
    • wss://ws012.{BLOCKED}ve.com/proxy
    • wss://ws013.{BLOCKED}ve.com/proxy
    • wss://ws014.{BLOCKED}ve.com/proxy
    • wss://ws015.{BLOCKED}ve.com/proxy
    • wss://ws016.{BLOCKED}ve.com/proxy
    • wss://ws017.{BLOCKED}ve.com/proxy
    • wss://ws018.{BLOCKED}ve.com/proxy
    • wss://ws019.{BLOCKED}ve.com/proxy
    • wss://ws020.{BLOCKED}ve.com/proxy
    • wss://ws021.{BLOCKED}ve.com/proxy
    • wss://ws022.{BLOCKED}ve.com/proxy
    • wss://ws023.{BLOCKED}ve.com/proxy
    • wss://ws024.{BLOCKED}ve.com/proxy
    • wss://ws025.{BLOCKED}ve.com/proxy
    • wss://ws026.{BLOCKED}ve.com/proxy
    • wss://ws027.{BLOCKED}ve.com/proxy
    • wss://ws028.{BLOCKED}ve.com/proxy
    • wss://ws029.{BLOCKED}ve.com/proxy
    • wss://ws030.{BLOCKED}ve.com/proxy
    • wss://ws031.{BLOCKED}ve.com/proxy
    • wss://ws032.{BLOCKED}ve.com/proxy
  • It accesses the following libraries:
    • https://{BLOCKED}ve.com/lib/coinhive.min.js
    • https://{BLOCKED}ve.com/lib/worker-asmjs.min.js?v7
    • https://{BLOCKED}ve.com/captcha
    • https://{BLOCKED}ve.com/media/miner.html
    • https://{BLOCKED}mine.com/authenticate.html

This malicious script runs on web browsers, which may be installed on any operating system.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.238.05

FIRST VSAPI PATTERN DATE:

08 May 2018

VSAPI OPR PATTERN File:

14.239.00

VSAPI OPR PATTERN Date:

09 May 2018

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

Close all opened browser windows

Step 3

Scan your computer with your Trend Micro product to delete files detected as COINMINER_COINHIVE.SMF-JS. 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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