Author: Rheniel Rhay Ramos   

 

HEUR:Trojan.Script.Generic (Kaspersky)

 PLATFORM:

Windows

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE
Low
Medium
High
Critical

  • Threat Type:
    Coinminer

  • Destructiveness:
    No

  • Encrypted:
    No

  • In the wild:
    Yes

  OVERVIEW

INFECTION CHANNEL: Downloaded from the Internet, Dropped by other malware

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

  TECHNICAL DETAILS

File size: 264,632 bytes
File type: JS
Memory resident: No
INITIAL SAMPLES RECEIVED DATE: 18 March 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 Coinminer does the following:

  • It connects to the following URLs as part of its Coin Mining Routine:
    • https://www.{BLOCKED}cu.{BLOCKED}ad/lib/worker-asmjs.min.js
    • https://www.{BLOCKED}cu.{BLOCKED}ad/captcha/
    • https://www.{BLOCKED}cu.{BLOCKED}ad/media/miner.html
    • https://{BLOCKED}mine.com/authenticate.html
    • wss://{BLOCKED}1.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}2.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}3.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}4.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}5.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}6.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}7.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}8.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}9.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}0.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}1.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}2.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}3.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}4.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}5.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}6.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}7.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}8.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}9.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}0.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}1.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}2.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}3.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}4.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}5.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}6.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}7.www.{BLOCKED}cu.download/proxy
    • wss://{BLOCKED}8.www.{BLOCKED}cu.download/proxy
  • It uses the system's central processing unit (CPU) resources to mine cryptocurrency. This behavior makes the system run abnormally slow.

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: 14.154.05
First VSAPI Pattern Release Date: 27 March 2018
VSAPI OPR PATTERN-VERSION: 14.155.00
VSAPI OPR PATTERN DATE: 28 March 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.E-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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