Unsolicited message conducting to Drive-by Downloads of malware via malicious URL-s
The social engineering technique of the message is very important and diverse:
Unsolicited message with infected attachments
Drive-by Downloads of malware from websites containing infected web objects
In the case where user interaction is needed, there is normally a webpage that informs that a browser extension or add-on needs to be installed, or that there is a software that is needed to visualize some active content and is missing. In some cases, the attack is so advanced that the executable is very similar in name and is eventually signed with a certificate that is either fake or expired, or even a valid certificate.
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