Antivirus Isn't Enough Anymore: A Primer on EDR and ITDR
A completely real, not at all AI-generated picture of a hacker
Traditional antivirus works by recognizing known threats — it compares files against a list of malware it's already seen and blocks matches. Useful, but limited: it can't catch something new, and it can't tell "you" logging in from "someone pretending to be you." That gap is exactly why so many modern breaches involve no malware at all.
Two newer categories of protection close that gap: EDR and ITDR.
EDR: Watching How Devices Behave
EDR stands for Endpoint Detection and Response. Instead of just checking files against a known-bad list, it watches behavior on your laptops, desktops, and servers in real time. If a program suddenly starts encrypting files or trying to disable security tools, EDR can flag it — and often shut it down — even if that specific threat has never been seen before.
It also leaves a trail, giving your IT provider visibility into exactly what happened and how far it spread if something does occur.
ITDR: Watching How Accounts Behave
ITDR stands for Identity Threat Detection and Response, and it applies that same approach to logins and accounts. Many attackers skip malware entirely — they just steal a password and log in like a normal employee, with nothing for antivirus to catch.
ITDR looks for the signs that something's off with an identity rather than a device: a login from an unusual location, a sudden change to multi-factor authentication, or a mailbox rule quietly forwarding emails elsewhere. Those are the fingerprints of a compromised account, even when everything else looks routine.
Why Both Matter
EDR and ITDR answer two different questions: is this device doing something it shouldn't? and is this identity being used by someone it shouldn't? Between company devices and Microsoft 365 logins, that covers most of how modern work actually happens — and a business can be well-protected on one front while still exposed on the other.
Antivirus still catches plenty. It just isn't built to catch everything anymore.
If you're not sure what's currently covering your devices and accounts, it's worth a conversation with your IT provider.
Book a free consultation and we'll help you figure out where you stand.