IT Services
Information Security

Tips for Spotting a Bad Attachment

[updated October 7, 2020] October is Cybersecurity Awareness Month and the theme that Sheridan IT would like to highlight this year is ‘Be Careful Where You Click’. Every week through the month of October we will offer up some handy tips centred around this theme to help make your computing experiences more secure.

Tips for Spotting a Bad Attachment

While email attachments are a popular and convenient way to send documents, they are also a common source of viruses. Always exercise caution when opening attachments; especially attachments that you aren’t expecting.

  1. Be wary of archives – hackers often try to hide malicious files in these.
    zip, rar and tar icons
  2. Exercise caution with Office files that contain Macros – don’t click on “enable content” unless you are 100% sure the file can be trusted.
    Word, Excel and PPT icons
  3. Don’t trust files with double extensions (the one that matters is the last one).
    icon of file with a double extension - gif.exe

Security Awareness Training for Employees 

If you want to learn more about cybersecurity, all Sheridan employees have access to comprehensive, online security awareness training offered through KnowBe4. Go to and sign-in with your Sheridan email address to get started.

Questions or Concerns?

If you have questions or concerns about spotting bad attachments, or cybersecurity at Sheridan, contact the IT Service Desk at 905-845-9430 ext. 2150 or send email to