Adware.EoRezo
ThreatDown is now the name of the Malwarebytes line of business products. References to Malwarebytes below reflect the amazing technology used to first identify the threat.
Short bio
Adware.EoRezo, which is often called Tuto4PC, is a family of software bundlers that typically offers something useful for free and then makes money by bundling it with adware.
Type of infection
Adware.EoRezo bundles adware with free tutorials or software.
Malicious behavior
Adware.EoRezo typically shows advertisements related to, but not originating from, the websites you are visiting.
Protection
Malwarebytes blocks Adware.EoRezo
Home remediation
Malwarebytes can detect and remove Adware.EoRezo without further user interaction.