Published Oct 25, 2017 | Updated Mar 16, 2018

HTML/Brocoiner

Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases

Summary

This JavaScript code is a cryptocurrency miner that has been found on both malicious and compromised websites, including sites that offer streaming videos, adult content, and online shopping.
 
When this JavaScript is loaded—whenever one opens a webpage containing it—it automatically starts to mine for Monero or other cryptocurrency. This mining activity, often initiated without user consent, consumes resources and can slow down affected PCs.
 
This JavaScript code does not install itself and is simply deleted by Windows Defender Antivirus upon detection. This code might be detected multiple times during a short period if the page containing it is kept open or revisited.

This JavaScript code does not install itself and is simply deleted by Windows Defender Antivirus or Microsoft Security Essentials upon detection. This code might be detected multiple times during a short period if the page containing it is kept open or revisited.

Use cloud protection

Use cloud protection to help guard against the latest malware threats. It’s turned on by default for Microsoft Security Essentials and Windows Defender Antivirus for Windows 10. 

Go to Settings > Update & security > Windows Defender > Windows Defender Security Center > Virus & threat protection and make sure that your Cloud-based Protection settings is turned On.

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

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