Traditional antivirus catches yesterday's threats by matching known signatures. EDR watches how software actually behaves, catches what signatures miss, and records the evidence your response depends on.
Traditional antivirus asks one question about every file: does this match a known threat? That question made sense when threats were numbered and catalogued. Modern attacks are built to answer 'no' — new code, renamed tools, and malware that reshapes itself between infections. A defense that only recognizes known threats is, by definition, always one step behind.
Endpoint Detection and Response — EDR — changed the question. Instead of asking what a file is called, it asks what the software is actually doing.
What EDR actually does
EDR monitors the behavior of every endpoint: which processes launch which other processes, who is writing to what, and when normal activity turns unusual. A document that suddenly starts running scripts and reaching out to the internet is suspicious even if no catalogue has ever seen that exact file. Because EDR watches behavior, it can catch attacks that have never been seen before — not just the ones that have already been named.
It also keeps the record that antivirus never did: a detailed history of what happened on a machine before, during, and after an event. When something does get through, that history turns an afternoon of guesswork into minutes of certainty — what was affected, how it got in, and what needs to be cleaned.
Why it is now the minimum
Two shifts made signature-only protection insufficient. First, ransomware became a business for organized groups who continuously modify their tools to evade known signatures. Second, work dispersed — laptops leave the office, and a defense that only works behind the office firewall leaves most of your fleet unprotected. Insurers and security frameworks have noticed: EDR is increasingly a baseline expectation, not a premium option.
The part organizations miss: someone has to watch
EDR generates alerts, and alerts are only worth what happens next. An unwatched console is a recording of a break-in, not a prevention of one. When evaluating EDR, the decisive question is not which product — it is who responds:
- Is alert monitoring continuous, including after hours when real incidents rarely wait for morning?
- Does someone investigate and isolate a threat, or just forward an email to your team?
- Are detections tuned to your environment, so real threats get attention instead of drowning in noise?
Our take
At Alta, EDR is a standard part of how we protect endpoints — deployed, tuned, and monitored as part of managed security, not left as another console for your team to check. If your current protection still relies on signature antivirus alone, that is the first conversation worth having, because your people's ability to focus on what matters most — your mission — depends on the fundamentals being covered.