When we get emails and download files, Google itself scans the file for malicious content, then our antivirus on your computer. The problem is that once the file is compressed in ZIP, the hacker can compress the virus on our computer.
This is the technique used by a new hacking campaign discovered by Trustwave researchers, which seeks to distribute malware for phishing. NanoCore RAT malware e-mail gateway filters have been written.
Interestingly, the size of the compressed ZIP file that is detected to be distributed is larger than the size of the files inside it. In particular we are talking about a file called SHIPPING_MX00034900_PL_INV_pdf.exe, a file that contains malware is a Trojan.
Therefore, our recommendation is that if you access a zip file on your email from an unknown person you don't know, don't open it or don't download it at all because it will expose you to hacking.
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