Detection and response remain essential, but mature security programs also need a practical way to define what runs before unknown or unauthorized software executes.
Security leaders have spent the better part of two decades building detection capabilities. They invested in behavioral monitoring, threat intelligence, endpoint detection and response (EDR) platforms, and incident response playbooks. The result is a security ecosystem that is faster, more informed, and more capable of identifying threats than at any previous point in the industry’s history.
And yet, a fundamental question keeps surfacing in mature security programs: why is that software allowed to run in the first place?
That question reflects something important. Detection and response remain essential, but many mature security programs are no longer satisfied with investigating threats after execution begins. They are looking for a more practical way to define what runs across the environment before unknown or unauthorized software executes.
That shift is one reason application control is becoming more relevant again. It addresses a gap that detection alone was never designed to solve. Detection analyzes activity. Application control helps organizations decide what software should be trusted to run at all.
The Detection Era of Endpoint Security
For much of its history, endpoint security followed a straightforward premise: threats will arrive, so build the capability to find them quickly. Detection became the dominant paradigm. Organizations layered on signature-based tools, anomaly detection, behavioral analytics, and threat intelligence feeds. When those tools fired, response teams investigated and contained.This model made sense given the threat landscape at the time, and it delivered real value. Detection and response capabilities are now mature, well understood, and deeply embedded in enterprise security programs.
But detection-based security carries an implicit assumption: unknown or unauthorized software will execute first. Every detection model, no matter how sophisticated, operates after the fact. Something runs, signals are generated, and analysts respond. Even when the response is fast, the sequence is still reactive.
Why Detection Alone Leaves Gaps
The limitations of the purely detection-centered model are becoming clearer as attackers evolve their techniques. Modern threats frequently exploit legitimate software, signed tools, and built-in operating system components. Living Off the Land (LOTL) attacks are designed specifically to blend into normal activity, using trusted binaries to move laterally, exfiltrate data, or establish persistence.In these scenarios, detection tools face a difficult task. The activity may look legitimate until it does not. By the time enough signals accumulate to trigger an alert, damage may already be underway. Alert volumes climb. Investigation queues grow. Security teams spend more time chasing ambiguous signals and less time addressing meaningful risk.
The issue is not that detection tools fail. It is that detection alone cannot answer a more fundamental question: should this software be running here at all?
Why Application Control is Re-emerging
A growing number of security leaders are reconsidering their endpoint strategies. Rather than treating execution as the default state, with detection serving as the safety net, they are asking whether their organizations should define what is trusted to run before execution occurs.This is not a new concept. The principle of allowlisting and Deny by Default has existed in security thinking for years. What has changed is its feasibility. Earlier application control and allowlisting approaches often introduced significant operational friction: rigid policies that broke applications, high administrative overhead, and enforcement that could not keep pace with dynamic environments. Many organizations understood the value in theory but found it difficult to sustain in practice.
The shift now underway is less about a new technology category and more about a change in security mindset.
The old model asks, “Is this behavior malicious?”
The emerging model asks, “Have we intentionally trusted this software to run?”
Organizations moving in this direction are reducing their attack surface before malicious activity begins. They are not waiting for signals to appear. They are determining, in advance, what belongs in their environment and what does not.
Defining What Runs as a Security Discipline
For mature security programs, the next step is not abandoning detection. It is extending control earlier in the chain.Defining what runs means organizations make deliberate trust decisions about the applications, scripts, and other executable content that are allowed to operate across their environment. teams establish what is trusted first instead of assuming software can run unless it is later flagged as suspicious.
This is where application control matters. It gives organizations a practical way to move from observing activity to governing execution.
That does not mean every environment will approach trust decisions the same way. Different user groups, systems, workflows, and risk profiles require flexibility. But the principle is consistent: mature programs increasingly want control over what runs, not just visibility into what already has.
Application Control as a Strategic Security Layer
It is worth being clear about what application control is, and what it is not. Defining what runs is not a replacement for detection and response. Organizations that adopt application control still need EDR, still need visibility, and still need the ability to investigate and respond to threats. Those capabilities remain foundational.What application control adds is a different layer, one that operates earlier in the security chain. Detection answers, “Is this behavior suspicious?” Application control answers, “Should this software be running at all?” Together, they form a more complete and resilient endpoint security model.
When fewer unknown or unauthorized applications reach execution, detection tools operate in a cleaner environment. Alert volumes become more meaningful. Investigation effort concentrates on a smaller, higher-priority set of activities. The overall program becomes more efficient, and more defensible when security leaders need to explain their risk posture to boards, auditors, or regulators.
Combining for Effective Endpoint Security
For IT operations, application control that aligns with existing change management workflows can also reduce friction rather than create it. When trust decisions move through the same processes teams already use to manage software, enforcement becomes more predictable.
Operationalizing Application Control
For many organizations, the barrier to application control has never been philosophical. Security leaders have long understood the value of defining what runs. The challenge has been making it workable in dynamic, complex environments where applications evolve, users have different needs, and operational teams cannot afford disruption.Modern approaches to application control have addressed much of this friction. Continuous policy management allows trust decisions to evolve alongside the environment. Execution visibility gives teams the context they need to make informed decisions before stricter enforcement becomes necessary. Operational workflows allow organizations to introduce stronger control gradually, aligning enforcement with how change actually happens rather than forcing a disruptive cutover. The result is that application control is moving from a theoretical best practice to a practical security capability.
That operational model matters. In Forrester’s Total Economic Impact™ study of Airlock Digital, the composite organization modeled in the analysis saw a 224% ROI, $3.8 million in net present value, and more than a 25% overall reduction in breach risk over three years. The study also found reduced administrative overhead and improved software inventory management, reinforcing that application control can support both stronger security outcomes and operational efficiency when it is implemented as an ongoing process.
How Application Control Works Alongside EDR
Security teams do not need to choose between application control and EDR. They solve different problems, and they work better together.- EDR helps organizations detect, investigate, and respond to suspicious behavior on endpoints. It is designed to analyze what happens after execution begins.
- Application control helps organizations define what software is trusted to run before execution occurs.
For organizations that have already invested heavily in visibility and response, this is an important point. Application control does not replace those investments. It strengthens them by reducing the amount of unknown or unauthorized activity that reaches execution in the first place.
> What This Looks Like in Practice
The value of application control becomes clearer when it is put into operational terms.
In the EQT case study, EQT Corporation, the largest producer of natural gas in the United States, added Airlock Digital application control and allowlisting to its security stack to address risks from unknown software and Living off the Land attacks where existing detection and response capability was ineffective. EQT brought 1,500 endpoints under management without hiring additional team members, managed the solution with less than 0.15 FTE after implementation, and used Airlock Digital blocklisting to respond to a vendor compromise by auditing its environment and implementing additional blocking rules within 15 minutes. EQT described Airlock Digital as “an excellent complement” to its endpoint detection and response solution.
This is the point many organizations are now revisiting. Application control was once viewed as too rigid or too difficult to sustain. But when it is aligned with real-world workflows, the conversation changes. The question is no longer whether defining what runs is valuable. It is whether organizations can afford to leave execution decisions implicit.
The Next Phase of Endpoint Security Maturity
Security programs mature in stages. The detection era brought enormous capability gains. The next stage is not about moving past detection. It is about extending maturity to the point where organizations actively define what they trust before execution occurs.
That shift requires more than technology. It requires a change in how security and IT teams think about software execution, from a default state that needs monitoring to a deliberate decision that reflects organizational context and risk tolerance.
Airlock Digital is built to support this operational shift by helping organizations turn allowlisting into an ongoing discipline that aligns with how security and IT teams actually work, rather than a rigid control layered onto an already complex environment.
For security leaders thinking about where their programs go next, the direction is becoming clearer: move earlier, reduce exposure before execution, and make intentional decisions about what belongs in the environment.
That is why application control matters for mature security programs.
Application Control FAQs
Application control prevents untrusted software from running, while EDR detects and responds to threats after execution. They work best together.
Learn more in our blog: Why Is the Term “Control” Often Misused in Endpoint Security?.