How can I tell if my network has been breached?

Read these seven telling signs. Look for clues like:

Your network shows signs of unknown traffic in the payment card environment or from store to headquarters locations
Unapproved and unknown software, files and devices installed in your network
Data that’s been inexplicitly tampered with or deleted
You notice unusual after-hours activity in your network
You find unauthorized new user accounts added to your system
Your systems are shutting down and rebooting spontaneously
Your anti-virus software is not working correctly or is being disabled without command

Continued on the next blog – I have identified signs that my network has been breached. What do I do now?