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COINMINER_WEBXMR.A-JS

February 16, 2018
 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 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.

It does not have any propagation routine.

It does not have any backdoor routine.

  TECHNICAL DETAILS

File Size:

514,479 bytes

File Type:

JS

Memory Resident:

No

Initial Samples Received Date:

14 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.

Propagation

This Coinminer does not have any propagation routine.

Backdoor Routine

This Coinminer does not have any backdoor routine.

NOTES:

This JavaScript is embedded into websites to run miner for Monero cryptocurrency miner. It uses the system's central processing unit (CPU) resources to mine for Monero cryptocurrency. This behavior makes the system run abnormally slow.

The script accepts following relevant parameters:

  • Target number of mining threads per tab
  • Throttle rate
  • Execution / start - mode
  • Target number of hashes to solve
  • IF_EXCLUSIVE_TAB
    The miner starts if no other tabs are already mining
  • FORCE_EXCLUSIVE_TAB
    The miner always starts and immediately kills all miners in other tabs that have not specified FORCE_MULTI_TAB
  • FORCE_MULTI_TAB
    The miner always starts

    It has the capability to monitor the following events:

    • open
    • authed
    • close
    • error
    • job
    • found
    • accepted

    It sends events and other data to the following URLs / WebSocket Shards:

    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy
    • wss://{BLOCKED}.{BLOCKED}-loot.com/proxy

    It accesses the following libraries:

    • https://{BLOCKED}-loot.com/lib/
    • https://{BLOCKED}-loot.com/captcha/

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.968.02

FIRST VSAPI PATTERN DATE:

15 Feb 2018

VSAPI OPR PATTERN File:

13.969.00

VSAPI OPR PATTERN Date:

16 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

Identify and terminate files detected as COINMINER_WEBXMR.A-JS

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

Step 3

Close all opened browser windows

Step 4

Scan your computer with your Trend Micro product to delete files detected as COINMINER_WEBXMR.A-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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