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According to an article from Ars Technica , the 7-Zip utility contained a flaw that allowed attackers to bypass Windows' security feature. Key Details of the Vulnerability

This inner file triggers an automatic download of a final malware payload, bypassing MotW restrictions entirely. 3sg.7z

Opening it reveals an inner archive (sometimes disguised with Cyrillic characters to look like a document). According to an article from Ars Technica ,

Be cautious of sites like 7zip.com (note the .com extension), as Malwarebytes has reported that these fake download sites distribute trojanized versions of the software that can turn your PC into a proxy node for cybercriminals. Have you to the latest version recently? 3sg.7z