(08) 9425 5560 info@hyperit.com.au

The current strain we are seeing targets clients that are advertising for employment

If you are advertising and receive any resumes in a .zip format do not open them, instead check the email address for the sender and if it looks 'normal' you could respond asking for a safer format

In addition to the above tips, ensuring you have updated and active anti-virus is essential as are regular backups. If you do not have a backup system, or are unaware of the restrictions of your backup system, please get in touch with your system administrator to ensure your data is safe.

As always, Hyper IT is available to assist in all of the above and you should notify us if you start noticing any of the following symptoms:

  • Files not opening due to ‘corruption’
  • Random files appearing in regularly used folders
  • Any prompt describing a process requiring a payment

Recognizing File Types by Extensions

A file attached to an email message can be potentially dangerous when it has one of a variety of extensions that instruct your computer to do certain things with them. This means that if you click and launch them, they may execute instructions on your computer. Review the list below of file extensions and be certain to never open an email attachment that contains executables.

The “Don’t Open – Dangerous!” List: Executable File Extensions

.EXE  (machine language)    
.COM  (machine language)    
.VB   (Visual Basic script)    
.VBS  (Visual Basic script)    
.VBE  (Visual Basic script-encoded)    
.CMD  (batch file - Windows)    
.BAT  (batch file - DOS/Windows)    
.WS   (Windows script)    
.WSF  (Windows script)    
.SCR  (screen saver)    
.SHS  (OLE object package)    
.PIF  (shortcut to DOS file plus code)    
.HTA  (hypertext application)    
.JAR  (Java archive)    
.JS   (JavaScript script)    
.JSE  (JScript script)    
.LNK  (Windows shortcut to an executable)    
.SYS  (Windows system file)    
.CPL  (Windows Control Panel file)    
.PHP3 (PHP version 3 Script file)    
.WSS  (Windows system sound file)    
.PCX  (Windows Paintbrush bitmap image)

The “Use Caution” List: Executable File Extensions

.ZIP  (Compressed File Archive) Contains files that may have executables.
.XLS  (Excel) Can contain macros that execute. (Also .XLSW, .XLW)
.DOC  (Word) Can contain macros that execute. .EXE  (Also .DOCX, .DOCM)
.PPT  (PowerPoint) Can contain macros (Also .PPTX, PPTM)

The “Generally Safe” List: Non-Executing File Extensions

.TXT  (Text) 
.CDF  (Comma Delimited Format Text)
.PDF  (Adobe Acrobat Format)
.GIF  (Graphic)
.JPG  (Graphic)
.TIF  (Graphic)
.MPG  (Movie)
.MP3  (MPEG compressed audio)
.WAV  (Audio)

source: http://www.bank-northwest.com/news-articles/security-fraud/safe-and-dangerous-email-file-extensions.aspx

This list is by no means comprehensive as there are hundreds of additional file extensions representing many different kinds of files.  Exercise care with all files, ensuring that you know what is in them and what format they should be for safe access before clicking them to open them.