Published Oct 08, 2017 | Updated Mar 16, 2018

Trojan:HTML/Brocoiner.C

Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases

Summary

Windows Defender Antivirus detects and removes this threat.

This malware is a JavaScript cryptocurrency miner that is being served on web pages. When a computer visits one of these web pages, this JavaScript malware launches locally and uses the computer's resources to mine cryptocurrency. Such mining activities can be resource intensive and can cause visiting computers to slow down.

Known samples of this malware have been observed mining Monero coin, a type of cryptocurrency. These samples were found in websites providing:

  • Streaming videos
  • Adult materials
  • Shopping

Some sites hosting this malware appear legitiate and might have been compromised for this purpose.

This malware is a variant of the Trojan:HTML/Brocoiner coinminer family.

Learn more about this type of threat: Invisible resource thieves: The increasing threat of cryptocurrency miners

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find hidden malware.

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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