Attack Trend

Snapshot or a Malicious File? .

By Perception Point Incident Response Team
November 6, 2018

There is a rise in the usage of a phishing technique that tricks the user into thinking that an image of the attached file can be quickly opened in snapshot mode. But in fact it is an attack.

How it works.

The user receives a mail with some information regarding the file image. By embedding the image into the mail, the attacker tricks the user into thinking that a simple click on the image will allow him to open it in snapshot mode without downloading the file or image itself. A common interaction in Office 365 and G-Mail.
However, as soon as he clicks on the file it opens an instant download page hiding behind the image and immediately starts downloading the malicious file.

PDF Image: The attacker is tricking the user to think a simple PDF file is attached to the mail but instead of opening it by clicking on the file it transports the user to an instant download page with a malicious file inside.

File Photo: By designating the file type to be a .png or .jpg, the attacker tricks the user into clicking the picture without even giving it a second thought.

Both of these examples evade mainstream email security solutions as they are deeply embedded into hidden layers. Perception Point sees these attacks thanks to our Recursive Unpacker, which extracts out each layer to be analyzed separately by our engines.

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