Malvertising campaign used a free certificate from Let’s Encrypt

Cybercriminals are taking advantage of an organization that issues free digital certificates, sparking a disagreement over how to deal with such abuse.

On Wednesday, Trend Micro wrote that it discovered a cyberattack on Dec. 21 that was designed to install banking malware on computers.

The cybercriminals had compromised a legitimate website and set up a subdomain that led to a server under their control, wrote Joseph Chen, a fraud researcher with Trend.

If a user went to the site, the subdomain would show a malicious advertisement that would redirect the user to sites hosting the Angler exploit kit, which looks for software vulnerabilities in order to install malware.

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