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すべてはタイミング:インシデント対応を最適化してリソースを節約する方法

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02
Aug 2023
02
Aug 2023
インシデントに対応する場合、タイミングが悪いとリソースを浪費してしまいます。そして、従来のインシデント対応戦略では、適切なタイミングを計ることが非常に困難でした。Darktrace HEAL を利用することで、企業はより迅速かつ効率的に重要なイベントを特定して対処できるようになり、セキュリティチームの時間、費用、労力を節約することができます。

サイバーインシデント対応計画でバランスを取る 

インシデントに対応する場合、タイミングが悪いとリソースを浪費します。そして、従来のインシデント対応戦略と従来の検知ツールの組み合わせでは、適切なタイミングを計ることが非常に難しくなります。 

組織が復旧作業をあまりに早く開始しすぎると、良性であることが判明した事象に対処してしまう可能性があり、これはリソースの浪費につながります。 

組織が復旧を始めるのが遅すぎると、攻撃を継続させ放置することになり、問題がより広範で複雑なものになる可能性があります。

その中間には、セキュリティチームが良性の事象に時間を浪費することなく、インシデントがエスカレートしすぎない最適な段階があります。しかし、特に検知ツールが誤検知を起こしやすく、より洗練された攻撃や斬新な攻撃がシグネチャベースのツールのレーダーの下を素通りすることが多い場合、このスイートスポットを見極めるのは難しいです。 

これは、セキュリティチームがインシデント対応を開始するまでの経過時間をX軸に、必要なリソースの量をY軸にとり、グラフ化することができます。非イベントの発生頻度が高いため、セキュリティチームが良性であることが判明した多くのイベントに対応するにつれてリソースが食いつぶされるため、ごく初期にスパイクが発生していることに気づくでしょう。

図1:インシデント対応は、早すぎず遅すぎず実施することで最大の効率を発揮します(グラフはイメージです)


インシデントに対応するのが遅すぎるという問題は、静的なインシデント対応プレイブックによって高まっています。インシデント対応プレイブックは、一般的な攻撃の種類に対応した「一律の」フォーマットで作成されることが多く、ランサムウェア用のものや、DDoS攻撃用のものなどがあります。これらは、攻撃の根絶、感染した資産の修復、証拠の収集、社内コミュニケーション、そして最終的な復旧に必要なステップの概要を示しています。 

このようなプレイブックは監査人やコンプライアンス要件を満たすのに役立ちますが、現実の世界ではあまり使用されません。なぜなら、攻撃の現実はプレイブックで設定された一般的なパラメータと完全に一致することはないからです。プレイブックは静的なものである一方、企業やそれを狙う脅威は常に進化しています。これは、攻撃者が大規模で洗練された革新的な攻撃を実行することを可能にする生成AIの台頭により、特に顕著になっています。 

言い換えれば、従来のプレイブックはすべて、書かれたその日に時代遅れになるということです。攻撃とプレイブックの対応プランのミスマッチにより、人間の注意はステップバイステップの指示に従うことからリアルタイムの意思決定に移るため、そのギャップを埋めるために人間のチームに負担がかかります。ストレスの多い状況下で、多くの場合、限られた情報しかない中で事象全体を総合的に判断することを余儀なくされるため、プレイブックからますます逸脱するようになり、プレイブックとの関連性が薄れていくのです。 

本物のセキュリティインシデントだけに対応し、そのインシデントが危機的状況になる前に対策を開始することで、セキュリティチームは必要なリソースを削減することができます。しかし、これは、正確な検知能力と、必要な情報をすべて提供する調査ツールがあればこそ可能になることです。 

より迅速で効率的なインシデント対応にAIを活用 

Darktrace HEAL™を使用することで、防御者は最適な時間帯に、より早くインシデント対応を開始することができます。AIテクノロジーは、お客様のビジネスデータからスピードとスケールで学習し、リアルタイムでイベントを特定、調査し、どのような活動に注意が必要かを判断します。DETECT のアラートが発報する個々の異常なイベントの点と点を自動的に結びつけ、より広範なセキュリティインシデントを探すことで、HEALのリカバリ機能の対象とします。

HEALは、このデータを活用することで、セキュリティチームが新たに発生した重要なインシデントに早期に対処できるようにするとともに、無関係なイベントに費やされる不要な時間と労力を排除します。インシデント対応を開始するための閾値を下げ、自動化を活用することで、組織はより早く、より多くの情報に基づいた意思決定を行うことができ、その結果、迅速かつ少ないリソースで復旧を行うことができます。

下記のグラフには2つのことが発生しています。まず、ツールの改善により、曲線全体が下方にシフトしています。セキュリティチームは、自動化、AIが生成する特注のプレイブック、および統合の恩恵を受けるようになり、その結果、必要なリソースの量は曲線のすべての段階で低下しています。また、不正確な検知と厳しいインシデント対応アクティブ化ポリシーのために、インシデント対応担当者がこれまで到達できなかったスイートスポットが達成可能になっています。

図2:Darktrace HEAL により、インシデントレスポンスはより早く、より少ないリソースで実施できます(グラフはイメージです)


オーダーメイドのプレイブックが復旧を加速させる

HEAL は、復旧プロセスのいくつかのステップを自動化し、インシデント対応の速度を加速させます。AIが生成するオーダーメイドのインシデント対応プレイブックを作成し、進化する組織理解を活用して、特定のインシデントとその環境に合わせた復旧手順を決定します。例えば、クラウドの移行では、従来の静的なプレイブックでは考慮されない新しいアーキテクチャが導入される可能性がありますが、HEALでは考慮されます。 

これらのオーダーメイドのプレイブックは、組織固有のデータに基づいて学習し、ビジネスに対する理解を継続的に更新する自己学習型AIを使用することで、ビジネスと脅威の状況の両方の変化に対応することができます。このカスタマイズされたAI学習の結果、これらのプレイブックは、インシデント発生中および発生後に適切なアクションを取り、過剰に対応することなく、より効率的なインシデント対応を促進することができます。

AIはまた、さらなる被害状況や、攻撃がピボットやエントリーポイントとして特定の資産にどれだけ依存しているか、RESPONDが資産の不要な活動を一時的に封じ込めたかなどの種々の要因に基づいて、修復アクションの順序に優先順位を付けます。

HEALの特注プレイブックは、迅速な根絶と復旧が必要なクリティカルなインシデントの場合にも、新たに発生したインシデントの日常的なトリアージの場合にも適用されます。オーダーメイドのプレイブックを使用することで、組織はコンプライアンスに配慮しつつ、現実的で実用的な価値を得ることができます。 

インシデント対応をシンプルに

従来、組織はインシデントへの対応が早すぎたり遅すぎたりするスイートスポットを見つけるのに苦労し、リソースを浪費したり、評判や財務上の問題に直面したりする可能性を高めてきました。 

HEALを使用することで、組織はより効果的に重要なイベントを特定し、対処することができます。このAIテクノロジーは、強化された検知機能を駆使して、重要なインシデントを早期に発見し、無関係な事象に時間と労力を費やすことはありません。AIが作成したオーダーメイドのプレイブックを活用することで、適用可能な復旧計画を確保し、復旧をさらに効率化します。 

インシデントレスポンスのタイミングを調整することで、HEALは正確な検知と迅速な復旧を行い、セキュリティチームの時間、コスト、労力を節約します。

HEAL は、Darktraceの「サイバーAIループ」の最終段階であり、攻撃ライフサイクルの各段階で防御者を支援する相互接続されたセキュリティエコシステムの一部を構成します。AI出力は、Darktrace PREVENT™、Darktrace DETECT™、Darktrace RESPOND™、そしてHEAL の各製品間を流れ、継続的かつ自律的にセキュリティを強化するものです。 

図3:サイバーAIループは、DarktraceのAI出力を共有することで互いの製品が増幅し合う好循環をもたらす
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.
AUTHOR
ABOUT ThE AUTHOR
Dan Fein
VP, Product

Based in New York, Dan joined Darktrace’s technical team in 2015, helping customers quickly achieve a complete and granular understanding of Darktrace’s product suite. Dan has a particular focus on Darktrace/Email, ensuring that it is effectively deployed in complex digital environments, and works closely with the development, marketing, sales, and technical teams. Dan holds a Bachelor’s degree in Computer Science from New York University.

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Looking Beyond Secure Email Gateways with the Latest Innovations to Darktrace/Email

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09
Apr 2024

Organizations Should Demand More from their Email Security

In response to a more intricate threat landscape, organizations should view email security as a critical component of their defense-in-depth strategy, rather than defending the inbox alone with a traditional Secure Email Gateway (SEG). Organizations need more than a traditional gateway – that doubles, instead of replaces, the capabilities provided by native security vendor – and require an equally granular degree of analysis across all messaging, including inbound, outbound, and lateral mail, plus Teams messages.  

Darktrace/Email is the industry’s most advanced cloud email security, powered by Self-Learning AI. It combines AI techniques to exceed the accuracy and efficiency of leading security solutions, and is the only security built to elevate, not duplicate, native email security.  

With its largest update ever, Darktrace/Email introduces the following innovations, finally allowing security teams to look beyond secure email gateways with autonomous AI:

  • AI-augmented data loss prevention to stop the entire spectrum of outbound mail threats
  • an easy way to deploy DMARC quickly with AI
  • major enhancements to streamline SOC workflows and increase the detection of sophisticated phishing links
  • expansion of Darktrace’s leading AI prevention to lateral mail, account compromise and Microsoft Teams

What’s New with Darktrace/Email  

Data Loss Prevention  

Block the entire spectrum of outbound mail threats with advanced data loss prevention that builds on tags in native email to stop unknown, accidental, and malicious data loss

Darktrace understands normal at individual user, group and organization level with a proven AI that detects abnormal user behavior and dynamic content changes. Using this understanding, Darktrace/Email actions outbound emails to stop unknown, accidental and malicious data loss.  

Traditional DLP solutions only take into account classified data, which relies on the manual input of labelling each data piece, or creating rules to catch pattern matches that try to stop data of certain types leaving the organization. But in today’s world of constantly changing data, regular expression and fingerprinting detection are no longer enough.

  • Human error – Because it understands normal for every user, Darktrace/Email can recognize cases of misdirected emails. Even if the data is correctly labelled or insensitive, Darktrace recognizes when the context in which it is being sent could be a case of data loss and warns the user.  
  • Unclassified data – Whereas traditional DLP solutions can only take action on classified data, Darktrace analyzes the range of data that is either pending labels or can’t be labeled with typical capabilities due to its understanding of the content and context of every email.  
  • Insider threat – If a malicious actor has compromised an account, data exfiltration may still be attempted on encrypted, intellectual property, or other forms of unlabelled data to avoid detection. Darktrace analyses user behaviour to catch cases of unusual data exfiltration from individual accounts.

And classification efforts already in place aren’t wasted – Darktrace/Email extends Microsoft Purview policies and sensitivity labels to avoid duplicate workflows for the security team, combining the best of both approaches to ensure organizations maintain control and visibility over their data.

End User and Security Workflows

Achieve more than 60% improvement in the quality of end-user phishing reports and detection of sophisticated malicious weblinks1

Darktrace/Email improves end-user reporting from the ground up to save security team resource. Employees will always be on the front line of email security – while other solutions assume that end-user reporting is automatically of poor quality, Darktrace prioritizes improving users’ security awareness to increase the quality of end-user reporting from day one.  

Users are empowered to assess and report suspicious activity with contextual banners and Cyber AI Analyst generated narratives for potentially suspicious emails, resulting in 60% fewer benign emails reported.  

Out of the higher-quality emails that end up being reported, the next step is to reduce the amount of emails that reach the SOC. Darktrace/Email’s Mailbox Security Assistant automates their triage with secondary analysis combining additional behavioral signals – using x20 more metrics than previously – with advanced link analysis to detect 70% more sophisticated malicious phishing links.2 This directly alleviates the burden of manual triage for security analysts.

For the emails that are received by the SOC, Darktrace/Email uses automation to reduce time spent investigating per incident. With live inbox view, security teams gain access to a centralized platform that combines intuitive search capabilities, Cyber AI Analyst reports, and mobile application access. Analysts can take remediation actions from within Darktrace/Email, eliminating console hopping and accelerating incident response.

Darktrace takes a user-focused and business-centric approach to email security, in contrast to the attack-centric rules and signatures approach of secure email gateways

Microsoft Teams

Detect threats within your Teams environment such as account compromise, phishing, malware and data loss

Around 83% of Fortune 500 companies rely on Microsoft Office products and services, particularly Teams and SharePoint.3

Darktrace now leverages the same behavioral AI techniques for Microsoft customers across 365 and Teams, allowing organizations to detect threats and signals of account compromise within their Teams environment including social engineering, malware and data loss.  

The primary use case for Microsoft Teams protection is as a potential entry vector. While messaging has traditionally been internal only, as organizations open up it is becoming an entry vector which needs to be treated with the same level of caution as email. That’s why we’re bringing our proven AI approach to Microsoft Teams, that understands the user behind the message.  

Anomalous messaging behavior is also a highly relevant indicator of whether a user has been compromised. Unlike other solutions that analyze Microsoft Teams content which focus on payloads, Darktrace goes beyond basic link and sandbox analysis and looks at actual user behavior from both a content and context perspective. This linguistic understanding isn’t bound by the requirement to match a signature to a malicious payload, rather it looks at the context in which the message has been delivered. From this analysis, Darktrace can spot the early symptoms of account compromise such as early-stage social engineering before a payload is delivered.

Lateral Mail Analysis

Detect and respond to internal mailflow with multi-layered AI to prevent account takeover, lateral phishing and data leaks

The industry’s most robust account takeover protection now prevents lateral mail account compromise. Darktrace has always looked at internal mail to inform inbound and outbound decisions, but will now elevate suspicious lateral mail behaviour using the same AI techniques for inbound, outbound and Teams analysis.

Darktrace integrates signals from across the entire mailflow and communication patterns to determine symptoms of account compromise, now including lateral mailflow

Unlike other solutions which only analyze payloads, Darktrace analyzes a whole range of signals to catch lateral movement before a payload is delivered. Contributing yet another layer to the AI behavioral profile for each user, security teams can now use signals from lateral mail to spot the early symptoms of account takeover and take autonomous actions to prevent further compromise.

DMARC

Gain in-depth visibility and control of 3rd parties using your domain with an industry-first AI-assisted DMARC

Darktrace has created the easiest path to brand protection and compliance with the new Darktrace/DMARC. This new capability continuously stops spoofing and phishing from the enterprise domain, while automatically enhancing email security and reducing the attack surface.

Darktrace/DMARC helps to upskill businesses by providing step by step guidance and automated record suggestions provide a clear, efficient road to enforcement. It allows organizations to quickly achieve compliance with requirements from Google, Yahoo, and others, to ensure that their emails are reaching mailboxes.  

Meanwhile, Darktrace/DMARC helps to reduce the overall attack surface by providing visibility over shadow-IT and third-party vendors sending on behalf of an organization’s brand, while informing recipients when emails from their domains are sent from un-authenticated DMARC source.

Darktrace/DMARC integrates with the wider Darktrace product platform, sharing insights to help further secure your business across Email Attack Path and Attack Surface management.

結論

To learn more about the new innovations to Darktrace/Email download the solution brief here.

All of the new updates to Darktrace/Email sit within the new Darktrace ActiveAI Security Platform, creating a feedback loop between email security and the rest of the digital estate for better protection. Click to read more about the Darktrace ActiveAI Security Platform or to hear about the latest innovations to Darktrace/OT, the most comprehensive prevention, detection, and response solution purpose built for critical infrastructures.  

Learn about the intersection of cyber and AI by downloading the State of AI Cyber Security 2024 report to discover global findings that may surprise you, insights from security leaders, and recommendations for addressing today’s top challenges that you may face, too.

参考文献

[1] Internal Darktrace Research

[2] Internal Darktrace Research

[3] Essential Microsoft Office Statistics in 2024

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Carlos Gray
Product Manager

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Managing Risk Beyond CVE Scores With the Latest Innovations to Darktrace/OT

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09
Apr 2024

Identifying Cyber Risk in Industrial Organizations

Compromised OT devices in ICS and SCADA environments pose significant physical risks, even endangering lives. However, identifying CVEs in the multitude of complex OT devices is labor-intensive and time-consuming, draining valuable resources.

Even after identifying a vulnerability, implementing a patch presents its own challenges limited maintenance windows and the need for uninterrupted operations strain IT and OT teams often leading organizations to prioritize availability over security leading vulnerabilities remaining unresolved for over 5 years on average. (1)

Darktrace’s New Innovation

Darktrace is an industry leader in cybersecurity with 10+ years of experience securing OT environments where we take a fundamentally different approach using Self-Learning AI to enhance threat detection and response.

Continuing to combat the expanding threat landscape, Darktrace is excited to announce new capabilities that enable a contextualized and proactive approach to managing cyber risk at industrial organizations.

Today we launch an innovation to our OT Cybersecurity solution, Darktrace/OT, that will add a layer of proactivity, enabling a comprehensive approach to risk management. This industry leading innovation for Darktrace/OT moves beyond CVE scores to redefine vulnerability management for critical infrastructure, tackling the full breadth of risks not limited by traditional controls.  

Darktrace/OT is the only OT security solution with comprehensive Risk Management which includes:

  • Contextualized risk analysis unique to your organization
  • The most realistic evaluation and prioritization of OT risk
  • Effectively mitigate risk across your OT infrastructure, with and without patching.
  • The only OT security solution that evaluates your defenses against Advanced Persistent Threat (APT) Groups.

The most comprehensive prevention, detection, and response solution purpose built for Critical Infrastructures

Darktrace’s Self-Learning AI technology is a cutting-edge innovation that implements real time prevention, detection, response, and recovery for operational technologies and enables a fundamental shift from the traditional approach to cyber defense by learning a ‘pattern of life’ for every network, device, and user.  

Rather than relying on knowledge of past attacks, AI technology learns what is ‘normal’ for its environment, discovering previously unknown threats by detecting subtle shifts in behavior. Through identifying these unexpected anomalies, security teams can investigate novel attacks, discover blind spots, have live time visibility across all their physical and digital assets, and reduce time to detect, respond to, and triage security events.  

  • Achieve greater visibility of OT and IT devices across all levels of the Purdue Model.
  • The industry's only OT security to scale threat detection and response, with a 92% time saving from triage to recovery.  
  • The only OT focused security solution to provide bespoke Risk Management.

To learn more about how Darktrace/OT approaches unique use cases for industrial organizations visit the Darktrace/OT Webpage or join us LIVE at a city near you.

Read more below to discover how new innovations to Darktrace/OT are bringing a new, contextualized approach to Risk Management for Industrial organizations.

For more information on the entire Darktrace/OT Solution read our solution brief here.

Darktrace/OT and New Risk Management

Risk Identification

Leveraging the visibility of Darktrace/OT which identifies individual systems throughout the Purdue Model and the relationship between them, Darktrace/OT identifies high-risk CVEs and presents potential attack routes that go beyond techniques requiring a known exploit, such as misuse of legitimate services. Each attack path will have a mathematical evaluation of difficulty and impact from initial access to the high value objectives.  

Together this gives comprehensive coverage over your real and potential risks from both an attacker and known vulnerability perspectives. OT attack paths as seen here even leverage insights between the industrial and corporate communications to reveal ways threat actors may take advantage of IT-OT convergence. This revelation of imperceptible risks fills gaps in traditional risk analysis like remote access and insider threats.

Figure 1: Darktrace/OT visualizing the most critical attack paths at an organization
Figure 1: Darktrace/OT visualizing the most critical attack paths at an organization
Figure 2: A specific Attack Path identified by Darktrace/OT

Risk Prioritization

Darktrace/OT prioritizes remediations and mitigations based on difficulty and damage to your unique organization, using the established Attack Paths.

We ascertain the priorities that apply to your organization beyond pure theoretical damage answering questions like:

  • How difficult is a particular vulnerability to exploit considering the steps an attacker would require to reach it?
  • And, how significant would the impact be if it was exploited within this particular network?

This expanded approach to risk prioritization has a much more comprehensive evaluation of your organization's unique risk than has ever been possible before. Traditional approaches of ranking only known vulnerabilities with isolated scores using CVSS and exploitability metrics, often leaves gaps in IT-OT risks and is blind to legitimate service exploitation.

Figure 3: Darktrace/OT leverages its contextual understand of the organization’s network to prioritize remediation that will have the positive impact on the risk score

Darktrace provides mitigation strategies associated with each identified risk and the relevant impact it has on your overall risk posture, across all MITRE ATT&CK techniques.

What sets Darktrace apart is our ability to contextualize these mitigations within the broader business. When patching vulnerabilities directly isn’t possible, Darktrace identifies alternative actions that harden attack paths leading to critical assets. Hardening the surrounding attack path increases the difficulty and therefore reduces the likelihood and impact of a breach.

That means unpatched vulnerabilities and vulnerable devices aren’t left unprotected. This also has an added bonus, those hardening techniques work for all devices in that network segment, so apply one change, secure many.

Figure 4: Darktrace prioritizes mitigation reducing accessibility of vulnerability and the overall risk score when patches aren’t available

Communicate Board Level Risk with APT Threat Mapping

Darktrace/OT bridges theory and practice as the only security solution that maps MITRE techniques, frequently used by APT Groups, onto AI-assessed critical Attack Paths. This unique solution provides unparalleled insights including sector and location intelligence, possible operating platforms, common techniques, exploited CVEs, and the number of potential devices affected in your environment, supporting holistic risk assessment and proactive defense measures.

Ultimately, this becomes a power dashboard to communicate board level risk, using both metric based evidence and industry standard threat mapping.

結論

Darktrace/OT is part of the Darktrace ActiveAI Security Platform a native, holistic, AI-driven platform built on over ten years of AI research. It helps security teams shift to more a productive mode, finding the known and the unknown attacks and transforming the SOC with the various Darktrace products to drive efficiency gains. It does this across the whole incident lifecycle to lower risk, reduce time spent on active incidents, and drive return on investment.

Discover more about Darktrace's ever-strengthening platform with the upcoming changes coming to our Darktrace/Email product and other launch day blogs.

Join Darktrace LIVE half-day event to understand the reality versus the hype surrounding AI and how to achieve cyber resilience.

Learn about the intersection of cyber and AI by downloading the State of AI Cyber Security 2024 report to discover global findings that may surprise you, insights from security leaders, and recommendations for addressing today’s top challenges that you may face, too.  

参考文献

1. https://research-information.bris.ac.uk/ws/portalfiles/portal/313646831/Catch_Me_if_You_Can.pdf

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Mitchell Bezzina
VP, Product and Solutions Marketing
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