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How to Reduce Dwell Time in Cybersecurity Before Ransomware Deploys

How to Reduce Dwell Time in Cybersecurity Before Ransomware Deploys

Written by: Lizzie Danielson

Published: 8/27/2026

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Imagine it's 3:00 a.m. on a Saturday. A program on your network starts stealing login credentials using a trojan running Mimikatz. By Monday at noon, your security tools catch the activity and clean it up. However, afterward, you discover the attacker actually broke into your network three months ago—and nobody noticed. Security professionals call those three months dwell time in cybersecurity. Your goal is to make that period as short as possible, and so is the threat actor's.

But why would a threat actor want a shorter dwell time if they could do more damage with more time? The longer they hang out in your system, the likelier they get caught. Because of this, attackers move fast. Many go from initial break-in to deploying ransomware in under 24 hours—a pace most lean IT teams struggle to match without dedicated support.

This guide explains what dwell time is, how attackers operate during it, and how you can reduce it.

Key Takeaways

  • Dwell time is the time a threat actor stays hidden in your network undetected. The longer they stay, the more data they steal.
  • Threat actors move fast, often launching full ransomware attacks in under 24 hours. Your detection must be even faster.
  • Threat actors hide by using the same tools your employees use. Watch for suspicious behavior rather than trying to track specific software.
  • Cut dwell time by combining continuous monitoring, behavioral analysis,automation plus human expert review. Together, these capabilities help catch intruders before they can leave a ransom note.

What's dwell time in cybersecurity?

If you're searching for the dwell time meaning in a professional context, it's the total time a threat actor spends inside your network before you discover them. You can calculate it by adding two specific time frames together:

Dwell time = MTTD (mean time to detect) + MTTR (mean time to respond)

  • MTTD is how long it takes to notice the breach.
  • MTTR is how long it takes to shut it down.

Both numbers matter, and both move on their own. Fast detection means little if response drags, and vice versa.

How long do attackers hide?

The timeline for modern breaches has shifted dramatically over the years. In 2014, the global median dwell time was 205 days. Thanks to better visibility and faster response tools, that window shrunk to just 10 days by 2023. However, there's been a slight uptick to 14 days as of 2025. This is largely due to threat actors finding ways to blend in with legitimate system activity. By contrast, ransomware-specific dwell times are shorter, with a median of five days once a ransom note reveals the breach.

Why dwell time matters for ransomware defense

Median numbers hide the true extremes. In reality, an intrusion can last anywhere from a single night to several years. Threat actors usually follow this predictable path. First, they scout your network (reconnaissance) and gain higher-level access (privilege escalation). Then, they jump between devices (lateral movement), steal your data, and deploy ransomware.

Consider these two real-world scenarios:

  • A hidden attacker: When CorePLUS, a managed service provider (MSP), inherited a new client environment, they discovered a threat actor already living inside for an unknown amount of time. By deploying Huntress during onboarding, the team immediately identified the compromise. Huntress SOC acted swiftly and shortened the dwell time to near-zero, protecting the business from a potentially catastrophic interruption.
  • A swift strike: Another MSP, NetSmart, faced a critical challenge when a ransomware attack targeted a client's externally hosted servers at 2:30 a.m. Huntress Managed EDR immediately surfaced the threat, and Huntress SOC isolated the affected systems. Thanks to this quick intervention, of the 375 endpoints managed by Huntress, not a single one became infected.

You never know what scenario you'll face. However, one rule remains constant: The less time threat actors sit in your network, the less data they steal, and the less it costs you. To shorten their dwell time, you must first learn how they exploit it.

How attackers exploit long dwell times & how to stop them

Threat actors rarely make noise. They aim to stay invisible, moving carefully through your network to blend in with your team's normal daily activity.

They typically follow these steps:

  • Getting in: Most intrusions start with a simple login. Threat actors use a phished Microsoft 365 password, a credential bought off a marketplace, or an exposed Remote Desktop Protocol (RDP) port left open to the internet. Or they can come in through rising supply chain attacks on a vendor you trust. None of it looks like an attack, so it slips past.
  • Spreading: Threat actors rarely settle for one account. Once inside, they use tools like Mimikatz to dump passwords directly from your computer's memory. From there, they quickly climb to an admin account, putting your servers and data backups within easy reach.
  • Staying hidden: Rather than relying only on obvious malware, threat actors increasingly abuse legitimate tools already on your machines or in your environment, such as remote monitoring and management (RMM) software and PowerShell. As documented in Huntress research on daisy‑chained rogue RMM tools, they use these "normal" admin utilities to deploy payloads, steal credentials, and maintain persistence while blending in with everyday IT activity.

What can stop them?

Chasing their specific tools won't get you far since attackers swap them all the time. Instead, you must watch for suspicious behavior. By focusing on the attacker's actions rather than their tools, you can catch them in the act.

How to reduce dwell time: 4 detection & response strategies

Prevention comes first. You reduce the ways an attacker can enter your environment by exposing fewer services to the internet and requiring multi-factor authentication (MFA) everywhere it's available. Ideally, phishing-resistant methods like security keys or passkeys for your most sensitive accounts. When you patch systems quickly and follow a 3-2-1 backup strategy you give your organization a reliable way to recover even if attackers reach your sensitive data.

However, no security perimeter holds forever. Once a threat actor gains access, you reduce dwell time only by catching them and shutting them down as quickly as possible. This is especially important on the assets they're after most, like your domain controllers and backups. Four capabilities help with that.

  1. Continuous endpoint monitoring

    You can't shorten dwell time on activities you can't see. For example, putting a lightweight agent on every endpoint, including laptops and servers, will help you close the blind spots threat actors rely on. It watches for suspicious activity and sends data to a central security team without slowing down computers.

  2. Behavioral detection

    Signature-based antivirus only detects threats it already recognizes. This allows brand-new malware variants or modified tools to walk right past your defenses. Instead, you need detection that follows a modern threat‑hunting process and focuses on behavior—things like unauthorized credential dumping or a workstation suddenly reaching out to a domain controller it has never touched before.

  3. Human analyst validation

    Your security tools generate more alerts than your team can possibly triage. When the team feels overwhelmed, they may overlook real threats, allowing dwell time to drag on. Automation should drop the obvious false positives, while a Security Operations Center (SOC) analyst tells you what's worth action on.

  4. 24/7 coverage

    Threat actors don't keep office hours. They frequently strike overnight or during a holiday weekend when no one's watching. If your security coverage clocks out at 5:00 p.m., you hand threat actors the entire night. Because staffing an in-house, round-the-clock rotation costs a fortune, most teams rely on an external SOC to provide coverage after business hours.

In short, you must monitor everything, verify each alert to avoid false positive pileups, and act on critical threats immediately.

How Huntress Managed EDR reduces dwell time

Huntress Managed EDR pairs our purpose built endpoint detection technology with a 24/7 AI-Centric SOC, giving you an industry-leading 8 minute mean time to respond (MTTR) from detection to containment. Our analysts investigate each alert instead of simply forwarding raw telemetry, keeping our false-positive rate under 1% so almost every alert you see carries real weight. Because the Huntress Agentic Security Platform and agents are lightweight and fully managed, most teams can roll out coverage across their environment quickly, without standing up their own security operations center or hiring in-house threat hunters.

The businesses hit hardest by dwell time aren't the ones with the weakest walls; they're the ones who can't spot an intruder already inside. Shrink that window, and the incident that could've made headlines becomes just another day nobody outside your IT team hears about. We built Huntress Managed EDR for exactly that.

See it for yourself: Get started with a free trial today.

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