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Is there a way to assure that email attachment could be opened in a safe manner


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Posted

I received several unsolicited email messages, see a snapshot.

I'm not sure if it's safe to open the attachment (a file name: google.com!th4u.com!1679616000!1679702399.xml).

27-03-2023_00001.png

Posted

if not on your contact list, simply delete, unless expecting something, then you should know that it is for you.  

 

Mouse over address will tell you who sent it.

Posted

To clarify...in short:

Recently, my MX records were changed by someone. I noticed that a few days later, and changed it back to Google as it is my email service provider. I also changed my password to cPanel.

 

I do have an antivirus (Bitdefender), but I'm not 100% sure it can protect me. 

 

Posted (edited)

Does someone know what is DMARC?

(see the new post by that name)

Edited by MikeWill
  • Confused 1
  • 3 weeks later...
Posted (edited)

To be save, run your mail program (I use Thunderbird) in a virtual machine. If something goes wrong, you delete it and copy it back from your backup storage. Takes less than 3 minutes.

Edited by JustAnotherHun
  • Thanks 1
Posted
On 3/29/2023 at 4:09 PM, MikeWill said:

To clarify...in short:

Recently, my MX records were changed by someone. I noticed that a few days later, and changed it back to Google as it is my email service provider. I also changed my password to cPanel.

 

I do have an antivirus (Bitdefender), but I'm not 100% sure it can protect me. 

 

And do you have an app which will keep the font on your posts at the same, readable, size please?

Posted

We have a laptop...if there are doubts I copy the attachment on it, disconnect it from the network and open it there.
But first we look the email.....If the bank does not know my name it is most probably not my bank, if the attachment is not ending in .pdf and there is no very clear reason why not it will be deleted.

Posted
31 minutes ago, JustAnotherHun said:

To be save, run your mail program (I use Thunderbird) in a virtual machine. If something goes wrong, you delete it and copy it back from your backup storage. Takes less than 3 minutes.

and the virtual machine can not access your main computer (you are not sharing your files with it)

Posted
2 minutes ago, h90 said:

and the virtual machine can not access your main computer (you are not sharing your files with it)

Correct. No "shared folders" between host and VM.

btw: .pdf-files are a risk aswell.

  • Thanks 1
Posted
Just now, JustAnotherHun said:

Correct. No "shared folders" between host and VM.

btw: .pdf-files are a risk aswell.

I would not open unknown .pdf on my office computer. And I saw attachments like filename.pdf.exe which on a quick look in Thunderbird could trick someone. But can do a .pdf opened in for example sumatrapdf do some harm? I think not but still would not risk it.

Posted

McAfee will scan all e mails and downloads before you open them.  Just use settings to select that option, that is, if you have McAfee of course .  

Posted
15 minutes ago, h90 said:

But can do a .pdf opened in for example sumatrapdf do some harm? I think not but still would not risk it.

I don't know sumatrapdf and never had a problem with .pdf. The risk should be quite low, but:

 

"A PDF is not an executable file, so it cannot infect your machine while sitting idle on your hard drive — the malware in a PDF needs to be interpreted and executed through PDF reader software. "

https://clario.co/blog/can-pdf-contain-virus/

Posted
20 minutes ago, ozimoron said:

Use linux and don't worry about it.

yes because I would be unable to get it opened ????
(just had the problem that I could not connect a linux machine to connect to Wifi....because of some bug)

Posted
5 minutes ago, JustAnotherHun said:

I don't know sumatrapdf and never had a problem with .pdf. The risk should be quite low, but:

 

"A PDF is not an executable file, so it cannot infect your machine while sitting idle on your hard drive — the malware in a PDF needs to be interpreted and executed through PDF reader software. "

https://clario.co/blog/can-pdf-contain-virus/

I see the bigger risk in having an email from your bank which looks OK and the statement.pdf.exe file name is not shown full or I am just too quick in clicking and open a file which isn't a pdf by mistake

Posted
33 minutes ago, h90 said:

.if there are doubts I copy the attachment on it, disconnect it from the network and open it there.

how will that stop the laptop from becoming infected or protect your environment when you reconnect?   

  • Thumbs Up 1
Posted
9 minutes ago, JustAnotherHun said:

I don't know sumatrapdf and never had a problem with .pdf. The risk should be quite low, but:

 

"A PDF is not an executable file, so it cannot infect your machine while sitting idle on your hard drive — the malware in a PDF needs to be interpreted and executed through PDF reader software. "

https://clario.co/blog/can-pdf-contain-virus/

https://www.adobe.com/acrobat/resources/can-pdfs-contain-viruses.html

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