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I downloaded a mp4 file from a website and I am wondering if a mp4 file can have a virus i scanned it with Malwarebytes nothing came up but i just wanna make sure if Malwarebytes says that it is safe does it mean like that it is 100 percent safe because I don't want to risk getting an infection.

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2 minutes ago, william12345 said:

i scanned it with Malwarebytes nothing came up

Malwarebytes does not target script files during a scan.. That means MB will not target; JS, HTML, VBS, .CLASS, SWF, BAT, CMD, PDF, PHP, etc.

It also does not target documents such as; PDF, DOC, DOCx, XLS, XLSx, PPT, PPS, ODF, etc.

It also does not target media files;  MP3, WMV, JPG, GIF, etc.

Malwarebytes will detect files like these on execution only with the anti-exploit module of the paid program.

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1 minute ago, william12345 said:

my upload speed is very bad and it is a 200mb file what is the worst thing that could happen if i opened this file like the size of the file is correct to the original and Malwarebytes says its safe

I worry more about the source of the file. where did it come from?

Again, Malwarebytes does not "scan" that file type.

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@william12345

No.  A virus is a executable file or code that is prepended, appended or cavity injected into a legitimate file and is able to self replicate.  Once infected, that infected file can further the infection by infecting other legitimate files.  Or the infection can spread from computer to computer.  Such code or executable self replicates.  That is it is able to spread on its own and without assistance.  On the other hand, trojans need assistance to spread.  There are trojans that also prepends, appends or cavity injects malicious code into a legitimate file.  However, the action stops there and can not spread.  Such a file may be deemed "trojanized" or "patched".

True MP4 files are media files and are not executable.  They can employ embedded malicious code that may exploit Digital Rights Management (DRM) and may be classed as a trojan.  An example would be the Wimad Trojan.

If the file is 200MB in size, see if you you place it in a ZIP file and what size that ZIP file becomes.  If in a ZIP file the MP4 can be highly compressed creating a ZIP in a size "like" 1~10MB, then it may be malicious and padded to make it "large" and in that ZIP file it is small enough to easily submit to Virus Total for a report.
 

References:
https://www.f-secure.com/v-descs/trojan-downloader_w32_wimad_gen!a.shtml

https://www.microsoft.com/en-us/wdsi/threats/malware-encyclopedia-description?Name=TrojanClicker%3AASX%2FWimad.gen!H&ThreatID=-2147337957

https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/TROJ_WIMAD.AP/

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I went to that web site and tried to "play" a video in Firefox and Edge.  The site wanted me to install a Plug-In to play that video in Firefox and in Edge it gave me a web site that wanted me to install a plug-in to "free memory".

I would not consider soap2day.to  to be a legitimate site and was created in December 2019 so it just a tad over a year old.

Edited by David H. Lipman
Edited for content, clarity, spelling and grammar
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47 minutes ago, David H. Lipman said:

I went to that web site and tried to "play" a video in Firefox and Edge.  The site wanted me to install a Plug-In to play that video in Firefox and in Edge it gave me a web site that wanted me to install a plug-in to "free memory".

I would not consider soap2day.to  to be a legitimate site and was created in December 2019 so it just a tad over a year old.

 

when you click play on a video in soap2day it opens a ad that's how they make money but anyway it opens an ad in another tab and you can just exit it and go back to the soap2day site and then click again and there will be another ad there are like 3 or something ads and then the video plays but if you have a ad block it works perfectly.

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