Analysis by: Patrick Angelo Roderno
ALIASES:

Coinhive JavaScript cryptocoin miner (PUA) (SOPHOS AV); HEUR:Trojan.Script.Generic (KASPERSKY); PUA/CryptoMiner.Gen (ANTIVIR); Trojan text/Script.BD (NORMAN)

 PLATFORM:

Windows

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

  • Threat Type: Coinminer

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: 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. It may be hosted on a website and run when a user accesses the said website.

This is the Trend Micro detection for Web pages that were compromised through the insertion of a certain malicious script. It uses the system's central processing unit (CPU) and graphical processing unit (GPU) resources to mine cryptocurrency.

  TECHNICAL DETAILS

File Size: 32,238 bytes
File Type: JS
Memory Resident: No
Initial Samples Received Date: 11 Feb 2018
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.

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

Other Details

This is the Trend Micro detection for Web pages that were compromised through the insertion of a certain malicious script.

It does the following:

  • Connects to the following URL to mine cryptocurrency:
    • https://{BLOCKED}ve.com/lib/coinhive.min.js?rnd={Random Number}

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

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.962.08
FIRST VSAPI PATTERN DATE: 12 Feb 2018
VSAPI OPR PATTERN File: 13.963.00
VSAPI OPR PATTERN Date: 13 Feb 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_MONERO.THBO-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:


Did this description help? Tell us how we did.