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November 20, 2025

ゼロトラストコントロールとAI駆動の検知でOTリモートアクセスを管理

本稿では、現代のOTが可視性だけに頼ることはできない理由、そしてゼロトラストアクセスコントロールとAI駆動のビヘイビア検知と組み合わせることにより、リアルタイムの監視、アカウンタビリティ、安全なリモートアクセスを、オペレーションを混乱させることなく実現する方法について、今後の展望も見据えて解説します。
Inside the SOC
Darktrace cyber analysts are world-class experts in threat intelligence, threat hunting and incident response, and provide 24/7 SOC support to thousands of Darktrace customers around the globe. Inside the SOC is exclusively authored by these experts, providing analysis of cyber incidents and threat trends, based on real-world experience in the field.
Written by
Pallavi Singh
Senior Product Marketing Manager
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20
Nov 2025

IT-OT統合へのシフト

近年、産業環境は相互接続が進み外部との連携により依存するようになりました。その結果、真にエアギャップされたOTシステムの現実味は薄れています。特に、OEMが管理するアセットを使用している、レガシー装置に対してリモート診断が必要となる、あるいは第三者のインテグレーターが頻繁に接続するケースなどでは難しいでしょう。

こうした連携は、デジタル変革戦略に基づくもの、あるいは運用効率目標のため、いずれの場合においてもOT環境をより接続された、より自動化された、よりITシステムと絡み合ったものにしつつあります。このような統合により新たな可能性が開かれますが、同時にOT環境は、従来のOTアーキテクチャが耐えるように設計されていないような、さまざまなリスクにさらされることになります。

最新化により生まれるギャップと可視性だけでは不十分な理由

最新化への取り組みにより新たなテクノロジーが産業環境にも導入され、IT環境とOT環境の統合とともに、可視性の欠如も生まれました。しかし、可視性を取り戻すことはスタート地点にすぎません。可視性は何が接続されているかを教えてくれるだけで、アクセスをどのように管理すべきかを教えてはくれません。そしてここがITとOTの分断が避けられなくなるポイントです。

ITではうまく機能するセキュリティ戦略もOTではしばしば不十分なことがあります。OT環境ではわずかな失敗が環境への危険性、安全に関する事故、あるいは多大なコストを伴う稼働の停止などにつながるからです。さらに、安全なアクセス、分割の徹底、説明責任などを求める法規制の高まりからの圧力が加わると、可視性だけではもはや不十分であるということが明確になります。産業環境に今必要なのは、精密性です。そこではコントロールが必要です。そして、オペレーションを中断させることなくその両方を実現する必要があります。それには、アイデンティティベースのアクセス制御、リアルタイムのセッション監視、そして継続的なビヘイビア検知が必要となります。

監視されていないリモートアクセスによるリスク

このリスクは、アセットの故障をトラブルシューティングするためにOEMが緊急にアクセスを必要とする場合など、重大なタイミングで現れます。

限られた時間というプレッシャーのなかで、アクセス権限はしばしば最小限の検証ですばやく付与され、決められたプロセスが省略されることがあります。一旦中に入れば、コマンドの実行、設定の変更、あるいはネットワーク内で水平移動するなど、ユーザーのアクションに対するリアルタイムの監視はないケースがほとんどです。こうしたアクションは多くの場合記録されず、あるいは何かが壊れるまで気づかれません。問題が起こると、チームは断片的なログをつなぎ合わせる作業やインシデント後のフォレンジック作業に追われますが、説明責任の経路は明確ではありません。

アップタイムが決定的に重要であり安全性が譲れない環境においてこのレベルの不透明性では、まったく持続可能ではありません。

可視性のギャップ:誰が何を、いつ行っているか?

私たちが直面している根本的な問題は、誰がアクセス権を持っているかということと、そのアクセス権で何が行われているかという現実がつながっていないことです。  

従来のアクセス管理ツールは認証情報を検証し、入り口を制限するかもしれませんが、セッション中のアクティビティについてリアルタイムの可視性を提供することは稀です。さらに、期待される振る舞いと、侵害、誤使用、設定間違いのかすかな兆候の違いを見分けられるものはさらに少ないでしょう。  

その結果、OTチームとセキュリティチームはしばしば、問題の最も重要なカギとなる、意図と動作が見えない状況に置かれます。

ゼロトラストコントロールとAI駆動の検知でギャップを解消

OTでのリモートアクセスを管理することは、接続権限を付与するだけの問題ではもはやありません。厳密なアクセスパラメーターを徹底すると同時に、異常な振る舞いを継続的に監視することが必要です。これには、精密なアクセスコントロールと、インテリジェントかつリアルタイムの検知という2つの側面からのアプローチが必要です。

ゼロトラストアクセスコントロールが基盤となります。アイデンティティベースの、ジャストインタイム型のアクセス権を適用することにより、OT環境において、外部ベンダーやリモートユーザーが明示的に操作を承認されたシステムに対してのみ、そして必要な時間のみアクセスできるよう徹底できます。これらのコントロールのは、特定のデバイス、コマンド、あるいは機能へのアクセスに制限できるだけの細かさが必要です。これらの原則をPurdueモデル全体に一貫して適用することにより、OT環境を過剰なリスクにさらしてしまうキャッチオール式のVPNトンネル、ジャンプサーバー、そして脆いファイアウォール例外などへの依存を解消することができます。

アクセスコントロールは方程式の1部にすぎない

Darktrace / OT は継続的なAI駆動のビヘイビア検知でゼロトラストコントロールを補強します。静的なルールや事前定義済みのシグネチャに依存する代わりに、Darktraceは自己学習型AIを使用して、あらゆるデバイス、プロトコル、ユーザーに渡る環境全体で何が"正常”かについての、リアルタイムの、変化し続ける理解を構築します。これにより、微細な設定ミス、認証情報の間違った使用、あるいは水平移動を、後から知るのではなく発生と同時にリアルタイムに検知することができます。

ユーザーのアイデンティティとセッション内のアクティビティを、ビヘイビア分析と相関付けることによりDarktraceは全体像を明らかにし、誰がどのシステムにアクセスしたか、どのようなアクションを実行したか、それらのアクションはこれまでの通常状態と比較してどうか、そして逸脱が発生したかどうかを知ることができます。リモートアクセスセッションに関連する当て推量を取り除き、明確な、コンテキストを含めた情報を提供します。

重要な点は、Darktraceがオペレーション内のノイズと本物のサイバー脅威に関連した異常を区別することです。CVEアラートから日常的なアクティビティまですべてを1つのストリームにまとめてしまう他のツールとは異なり、Darktraceは正しいリモートアクセス動作とミスや乱用の可能性を区別します。つまり、組織はコンプライアンスの観点からアクセスを監査できるとともに、セッションがもしエクスプロイトされていれば、その不正な使用は、高確度なサイバー脅威に関連したアラートとして確認できることを意味します。このアプローチはコントロールを補完するものとして利用することができ、もしアクセス権が過剰に拡大されている、あるいは間違って利用されている場合にも、その挙動を可視化し、それに対するアクションが可能です。

たとえば、セッションにおいて、普段とは異なるコマンドシーケンス、新たな水平移動経路、あるいはスケジュールされた時間帯以外のアクティビティが発生するなど、学習したベースラインを逸脱した場合、Darktraceは即座にフラグを立てることができます。これらの情報を基に、人手による調査を開始する、あるいはアクセス権のはく奪やセッション隔離などポリシーに応じて自動的にアクションをトリガーするなどが可能です。

この多層的なアプローチにより、リアルタイムの意思決定が可能になり、中断のないオペレーションが確保され、重要な作業を遅らせたりワークフローを中断したりすることなくあらゆるリモートアクティビティに対して完全な説明責任を担保することができます。

ゼロトラストアクセスとAI駆動の監視の組み合わせ:

  • きめ細かいアクセス適用: ゼロトラスト原則に従いコンプライアンスの要件を満たす、ロールベースの、ジャストインタイムのアクセス。 
  • コンテキストを加えた脅威検知: 自己学習型AIが異常なOT動作をリアルタイムに検知し、脅威をアクセスイベントとユーザーアクティビティに結びつける。 
  • 自動化されたセッション管理: 動作の異常によってアラートや自動制御をトリガーすることができ、アップタイムを維持しつつ封じ込めまでの時間を短縮。
  • Purdueレイヤー全体に渡る完全な可視性: 相関付けされたデータにより、IT、OTレイヤー全体にわたりリモートアクセスイベントをデバイスレベルの動作と結びつけることが可能。
  • スケーラブルかつ受動的な監視: 動作を受動的に学習することによりレガシーシステムやエアギャップされた環境全体をカバーすることが可能、シグネチャやエージェント、侵入型スキャンは必要なし。

妥協のない完全なセキュリティ

オペレーションの敏捷性かそれともセキュリティコントロールか、あるいは可視性かそれとも簡潔性か、これらのどちらかを選ぶ必要はもうありません。ゼロトラストアプローチをリアルタイムのAI検知で強化することにより、権限と動作の両方を認識し、産業オペレーションの現実に即した、多様な環境にスケール可能な、安全なリモートアクセスを実現することができます。

重要インフラの保護において、検知を伴わないアクセスはリスクであり、アクセスコントロールを伴わない検知は不完全だからです。

Inside the SOC
Darktrace cyber analysts are world-class experts in threat intelligence, threat hunting and incident response, and provide 24/7 SOC support to thousands of Darktrace customers around the globe. Inside the SOC is exclusively authored by these experts, providing analysis of cyber incidents and threat trends, based on real-world experience in the field.
Written by
Pallavi Singh
Senior Product Marketing Manager

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September 17, 2026

The Problem of Re-defining Human Value in the Agentic Age

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Newsfeeds are constantly informing us about the rapid escalation of agentic AI systems. These systems move far beyond simple machine-based computations, and  the focused, defined and bounded assistance that most AI systems started out as.

The next evolution of AI will harness the agentic properties of orchestration, automation, and heightened value-chains in IT, taking on the burden of workflow management, not just workflow delivery.

In nearly all of these instances, promises are made such as ‘this will free up human time’ or ‘this will allow people to focus on higher-order strategy’. However that message is delivered, one thing is clear: in ceding the orchestration and management of work to increasingly sophisticated AI agents and agentic systems, human value will be elevated to a particular and specific layer: the ability to judge its outputs.  As AI takes on more tasks, humans should be able to focus on a higher level of governance; making sure the decisions that AI offers us are ethical, responsible and worthwhile.  

But there are two major problems with that approach.

This blog discusses the problem of how Agentic systems are re-shaping how we review information, where we fit in, and when we make decisions.  It also discusses the problem of how the increased flow of confident, generated information affects the way we make judgement.  This blog considers how human judgement needs to adapt, and how a behavioral defense approach – using techniques pioneered by Darktrace – can help us do that.

The challenge of knowing where human judgement belongs

As we confer more automated decision-making to agentic systems, it might look increasingly less like ‘granting permissions’, and more like ‘surrendering authority’.  

The judgement layer for AI-generated work is not a fixed boundary. We have become used to the idea of a ‘human in the loop’ (HITL) and, historically, relationships between humans and IT systems were reasonably clear and bounded.  Computer and software systems were programmed to carry out certain tasks or automated functions, and humans could control the gates and decision points where actions were undertaken. Even across highly complex computational workflows, human interaction was a controllable node within the process; we were able to configure and regulate. But in the agentic age, where that human interaction sits, and what it can influence shifts every time AI systems are granted autonomy.  

This leads us to the first problem: if humans are moving themselves (or are being moved) into the ‘judgement’ part of the value chain, exactly where and when do we exercise that judgement?  

Humans are no longer the sole shepherds of computer-based or software-controlled outputs.  We are at times at least one step further (and slower) behind the new agentic shepherds.  We might also be blind to what they are doing.  Not only might we be removed and blind to the actions of our AI shepherds, but with the challenge of unknown, unapproved AI systems operating beyond our control, humans might not even know that our work is being shepherded by an AI at all.  Simply put, with the advent of greater levels of autonomy and orchestration, humans are at risk of not even knowing where to apply our newly-extended powers of strategic judgement.

Shadow AI – the use of unapproved AI systems or processes – is a growing threat to the role of effective governance and oversight. Shadow AI isn't just the AI you can't see. Its the AI you already know about being used in an unapproved way. The ability to generate effective oversight of the AI systems you use (or that are used on your behalf) will be increasingly important to ensure that human judgement in the AI value chain is effective, and deliberately placed.

The problem of what makes good judgement

The second problem lies in how flawed human judgement can be.  Humans are historically, notoriously, and, sometimes dangerously, unreliable when it comes to exercising judgement.  Humans are prone to the worst kinds of bias, the seduction of malign influence, and the sometimes-overwhelming urge to succeed. AI has long had a known flaw of operating with sycophancy, providing outputs that tend to agree with or flatter the human user.  But as AI grows ever more effective, there is a risk of both hyper-enablement (where humans increasingly and knowingly enable AI despite potential harm), as well as the greater risk of suggestion. Both of these aspects could skew the newly-elevated input of human judgement.

Imagine a highly competent AI system that has just orchestrated and managed a dizzying array of processes and workflows.  The AI is designed to present the human decision-maker with recommendations; based on analysis, comparison and other programmed factors.  This is where the human judgement layer is enabled.  But what if that judgement is summarily diffused by an AI-based recommendation that emulates the decision, provides plausible but unattractive alternatives, then suggests (or, worse, directs) the human end-user to take a particular course of action.

The risk here is that you are given a recommendation, tailored to your preferences (which the AI has learned, or which you have divulged), and which appears to make perfect sense.  It appears to be a well-weighted recommendation, with sound arguments that tap into our inherent biases or inclinations so that a specific decision-path is followed. With the growth of agentic systems specifically designed to match user profiles (from Cowork agents to ‘digital twin’ models), the likelihood of agentic influence could badly skew human judgement or, at the least, devalue the proposition that humans are taking a higher-layer of strategic control over AI-based decisions.

If AI convincingly recommends something that may be problematic, it can be difficult to discern both accurate data, and the context required to make the right judgement.

Given the two problems described above, the job of exercising valuable human judgement in the agentic age can draw down to these two questions:

  • When should humans intervene in the agentic process?  
  • How can we make the best possible judgement calls?

What humans contribute that AI cannot

For all the flaws that make human judgement unreliable, people have the edge over even the most sophisticated and powerful AI systems when it comes to issues such as ethics and social context.  An AI system can, with startling granularity, rank the value of adopting a new business proposal: offering predictive metrics on costs, returns, market value, time-to-deliver operations, conformance with legal registers, etc.  But it can’t tell if the business proposal is ethically sound, or if the business venture will potentially affect groups outside of the analyzed proposal. It can’t tell you if the CEO has a ‘bad feeling’ about this effort.  It can’t tell you if this is the right thing to do.  

The ability to add social context, balance complex interpersonal dynamics, understand nuance, and to go beyond what seems economically reasonable is where human judgement can add value.  

Human judgement is difficult to encapsulate in metrics. And the way we train our development may need to adapt too. Rather than building up a gradual, experiential knowledge base, we should think about training the skill of judgement itself; especially for an agentic age.

How behavioral security strengthens AI governance

If this all feels like a vicious circle (‘I need AI help to make good judgements’ / ‘AI can twist what I need to judge’) it needn’t be. The key to this is having a defense-in-depth approach, with tools that can actually help.

This is precisely where behavioral security becomes important. The complex and nuanced way that humans exercise judgement is often rooted in our ability to recognize behavior that doesn't look right. We may not always be able to articulate it immediately, but we can often identify when an action, recommendation, or outcome feels inconsistent with the context around it. As AI systems take on more responsibility across the decision chain, preserving that ability to recognize meaningful deviations becomes increasingly important.

Darktrace’s / SECURE AI is designed to do exactly that. It applies behavioral security to AI ecosystems, helping organizations understand how people, AI tools, identities, and agents interact across the business. By learning the patterns of normal AI usage and surfacing activity that deviates from those patterns, it provides security teams with the context needed to investigate risk, understand unusual behavior, and make informed governance decisions. Rather than relying solely on predefined rules or assumptions, this behavioral understanding helps organizations distinguish between expected AI activity and behavior that warrants closer scrutiny.

This matters because we are already in an era of information overload. If humans are expected to elevate their value through strategic judgement, the ability to do this without being overwhelmed by data (good or bad) will be critical.  

We need the ability to discern when we're being misled by AI, and whether our judgement calls are being made on the basis of accurate, contextual information. Darktrace / SECURE AI provides that additional layer of defensive security for activity we cannot easily see. Whether it is suspected Shadow AI or skewed recommendations, the net result is a protected organization, where users can more effectively use AI to make positive judgements.

For those where that judgement is a critical skill (both individuals, as well as those working in security teams), improving our metacognition - the ability to understand information in a broader context - will supercharge the value of human judgement. When those judgements are grounded in context rather than assumptions we have better information to make sound decisions.

Conclusion

Human judgement is a skill that is honed over time and experience.  Darktrace’s / SECURE AI employs the same principles, but at machine-speed. Rather than influencing or directing, Darktrace / SECURE AI offers AI-enabled assurance; providing human-based judgement with the right context to make a balanced decision.  

What we judge can be valued by the legitimacy of its outputs. For AI, those outputs are valued on the speed and accuracy of the information provided.  Increasingly for humans, the value of our outputs will be based on the validity of our judgement, and how we justify our decisions in ways that engineer confidence.  

Humans often know more than we can express, while AI is prone to expressing more than it truly understands. Humans can bridge the context AI often fails to appreciate. When that judgement is supported by relevant, impartial AI systems, this is the future space where good AI governance will be exercised.

Discover Darktrace / SECURE AI.

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Jason Lusted
AI Governance Advisor

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September 4, 2026

Darktrace Advances Incident Investigation and AI-Agent Security with OpenAI Daybreak Models

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Earlier this year, Darktrace joined OpenAI’s Daybreak Defense Network to explore how their cyber capabilities can be integrated within Darktrace products and services to transform how security teams move from signal to action.

At the heart of this work is Darktrace's behavioral understanding of customer environments and identification of complex security incidents, combined with OpenAI models that can add context to help explain why an incident matters and its potential impact on the business. By bringing these capabilities into defensive workflows security teams already use, the goal is to give defenders not just greater visibility, but the context and guidance they need to act with confidence.

Since joining the program, we've been working with OpenAI to explore how these capabilities can address specific security challenges for defenders.

The problem we're solving

Attackers continue to change how they operate, including by using AI to increase the speed and scale of some techniques. Security teams are already managing a large volume of alerts, and the question isn't just what's happening, but how it could affect the organization. Even when an incident is fully investigated and correlated, technical severity alone doesn't tell a security team how much it actually matters to the business. That same challenge extends to internal AI adoption. As organizations adopt more AI systems and agents, security teams need visibility into their behavior, access and activity, along with the broader business context needed to identify and investigate potential risk.

Darktrace's Adaptive AI™ builds a detailed, organization-specific picture of what's normal for each environment, and uses that picture to investigate threats and identify complex security activity across domains. OpenAI's models can build on Darktrace's correlated, technically prioritized incidents by adding context that can help defenders understand what may be at stake.

What we're building

Our work is focused on two areas: supporting security investigation and response, and helping defenders identify risky behavior across enterprise AI systems and agents.

The first aligns Darktrace's behavioral understanding with OpenAI models to support  security investigation and prioritization. Darktrace's Adaptive AI continuously learns the unique patterns of normal behavior within each customer it protects, creating a deep, organization-specific understanding of its digital estate. When unusual activity emerges, OpenAI's models can draw on that context to help analysts investigate the incident, understand its significance and assess potential business consequences — reducing the need to manually assemble context from fragmented signals.

Second, we are exploring how these capabilities can support AI-agent and runtime security through Darktrace / SECURE AI™. OpenAI’s Daybreak models can build on the detections and visibility Darktrace / SECURE AI provides, connecting signals across a customer's environment and help defenders identify potentially risky behavior involving AI systems and agents. Activity that might appear isolated can instead be connected with related signals, helping defenders investigate the broader context and determine appropriate remediation.

Darktrace brings deep cybersecurity expertise, an evolving understanding of each customer's environment, and AI-driven identification of threats across the digital estate. Through the Daybreak Defense Network, Darktrace is exploring how OpenAI models can augment those capabilities in defensive security workflows — supporting incident investigation and response and improving visibility into AI-agent and runtime risk.

These capabilities are still in development, and we're excited to continue building on this work.

To learn more about how Darktrace continues to innovate to meet today's most pressing security challenges, register for our upcoming launch broadcast here.

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