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内部関係者からの脅威、サプライチェーン、IoT:現代のサイバー攻撃を解剖

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03
May 2021
03
May 2021
The threat landscape is not what it was. Sprawling IoT ecosystems and globalized supply chains offer many opportunities for threat actors. Darktrace detects these vectors on a daily basis, sometimes in the very same attack.

それは金曜日、午後5時10分前のことでした。技術者がいつも通り電子ドアのチェックを行います。彼女は問題なくオフィスに入室します。彼女は信頼のおける外部ベンダーの技術者で、従業員も毎週彼女の姿を見ています。彼女はラップトップを開き、ドアアクセス制御ユニットに接続します。これはスマートロックを操作するための小型のIoTデバイスです。数分後、トロイの木馬が社内のネットワークにダウンロードされ、クリプトマイニングが開始し、機密データが抜き取られた証拠もありました。どこで問題が起こったのでしょうか?

ビジネス内の脅威:新たな夜明け

企業がデジタル変革のさまざまな要求に対応していくなかで、アタックサーフェスはかつてなく広がっています。IoTエコシステム内の脆弱性から、サプライチェーン内のブラインドスポット、そしてビジネスへのアクセスを悪用する内部関係者に至るまで、サイバー犯罪者達にとっての入口は無数に存在します。Darktraceはこうした脅威を日々目撃しています。本ブログで解説する上記の事例のように、同じ攻撃内に複数の要素が含まれていることもあります。

内部関係者による脅威は、彼らのシステムに対する知識とアクセスのレベルを、検知を回避し攻撃を開始する上での決定的アドバンテージとして使用します。しかし、内部関係者による脅威は必ずしも悪意があるとは限りません。あらゆる従業員または請負業者は潜在的な脅威です。フィッシングのリンクをクリックしたり、誤ってデータを送信してしまったりすることで、広範囲の侵害につながることがよくあります。

同時に、多数のIoTデバイスが固有のIPアドレスを持ってコーポレートネットワークやインターネットに接続している、職場内の接続環境は喫緊のセキュリティ課題です。たとえば、アクセス制御システムは、オフィスに誰がいつ入室するかを追跡し物理的なセキュリティのレイヤーを追加するものです。しかし、この制御システム自体がデジタルセキュリティを危険にさらすことになるのです。システムには多数のセンサー、ロック、アラームシステム、キーパッドなどが付属し、これらが機密性が高いユーザー情報を持ち社内のインフラにアクセスします。

さらに、かなりの割合のIoTデバイスが、セキュリティを考慮せずに作られています。ベンダーは市場投入までの期間を優先し、多くの場合セキュリティ対策を組み込むために費やすリソースを持っていません。IoTを製造するスタートアップ企業の数を考えてみてください。 60%以上のホームオートメーション製品企業は従業員が10名未満です。

内部関係者からの脅威をCyber AIが検知

2021年1月、中規模の北米の企業がサプライチェーン攻撃に遭いました。それはサードパーティベンダーがスマートドアの制御ユニットに接続したときに発生しました。

図1:攻撃は現地時間16:50に開始され、3.5時間継続しました。

メーカーの技術者が定期的なメンテナンスのために来社しました。彼らはドアアクセス制御ユニットに直接接続する権限を持っていました。しかし、彼らが使用していたラップトップ(外部から持ち込まれたもの)がマルウェアに感染していたことを知らなかったのです。

ラップトップが制御ユニットに接続されるとすぐに、マルウェアは開いているポートを検知し、脆弱性を発見して水平移動を開始しました。数分のうちに、このIoTデバイスは未知の外部IPアドレスに対するきわめて不審な接続を開始しました。接続はHTTPを使って行われ、疑わしいユーザーエージェントとURIを含んでいました。

Darktraceはその時、この制御ユニットがupsupx2.exeや36BB9658.moeを含むトロイの木馬やその他のペイロードをダウンロードしようとしていることを検知しました。他の接続はbase64でエンコードされた、デバイス名と組織の外部IPアドレスを含む文字列を送信するのに使用されました。

その少し後に、Monero (XMR) CPUマイナーを使った 暗号通貨マイニング活動が検知されました。このデバイスはSMBエクスプロイトを使って445番ポートで外部接続を行い、同時に古いSMBv1プロトコルを使っている脆弱な内部デバイスを探しました。

時間後、このデバイスはサードパーティリモートアクセスツールであるTeamViewerに関連したエンドポイントに接続しました。数分後、デバイスは15 MB以上のデータを100%未知の外部IPに対して送信している様子が見られました。

図2:1つのデバイスのインシデント(青)前後の期間の接続のタイムライン。この侵入に関連した接続はデバイスの通常の生活パターンからの著しい逸脱であり、複数の不審なイベントおよび度重なるモデル違反(オレンジ)につながりました。

サプライチェーン内のセキュリティ脅威

Cyber AIは制御ユニットが侵害されると即座に内部関係者からの脅威について顧客に知らせました。この攻撃は組織内の他のセキュリティスタックをすり抜けることに成功していました。これは信頼される外部のラップトップから直接もたらされたこと、そしてIoTデバイス自体がこのサードパーティベンダーによって管理されていたため、顧客がそれに対してほとんど可視性を持っていなかったという単純な理由によるものです。

従来型のセキュリティツールはこのようなサプライチェーン攻撃には効果がありません。SolarWindsハックからVendor Email Compromise (VEC)に至るまで、2021年はシグネチャベースのセキュリティに最後のとどめを刺し、昨日の攻撃に依存して明日の脅威を予測することはできない、ということを証明しました。

現代の組織に関わる国際的サプライチェーン、そして各種パートナーやサプライヤーの数の多さは、外部ベンダーをネットワークにアクセスさせつつ、侵入を許さないシステムをどうやって維持することができるかという深刻なセキュリティ上のジレンマを生みます。

最初の答えは、ゼロトラストアクセスです。これは企業ネットワークの内部、外部を問わずあらゆるデバイスを悪意あるものとして扱い、あらゆる段階で検証を要求するものです。2つ目の答えは可視性と対処です。セキュリティ製品はクラウドおよびIoTインフラを明確に照らし出し、エンタープライズ内にかすかな異常が発生次第、自律的に反応しなくてはなりません。

IoTに対する調査

DarktraceのCyber AI Analystが、最初の悪意ある実行形式ファイルのダウンロードを含め、攻撃のあらゆる段階を報告しました。

図3:Cyber AI Analystがデバイスの異常な動作を検知した例。C2接続や不審なファイルのダウンロードが行われている。

Cyber AI AnalystはC2接続を調査し、このアクティビティに対するハイレベルなサマリーを提供しました。このIoTデバイスは、ランダムに生成された英数字の名前を持つ不審なMOEファイルにアクセスしていました。

図4:デバイスのC2接続に関するCyber AI Analystのサマリー

AIはアクティビティのあらゆる段階を検知しただけでなく、Proactive Threat Notificationにより顧客に通知を行いました。これは攻撃が開始されてわずか数分後、高いスコアでのモデル違反が発生した16時59分のことでした。

部外者の危険

第三者によるデバイス設定の変更やネットワークの調整は意図せぬ結果を招くことがあります。5Gやインダストリー4.0の登場により著しく接続が進んだ我々の世界は、サイバー犯罪者にとって格好の遊び場となっています。

上記の事例では、IoTはセキュアではなく設定にもミスがありました。IoTエコシステムの性急な構築、入り組んだサプライチェーン、そしてコーポレートインフラに接続する人とデバイスの幅広さにより、今日の組織は事前に定義されたルールに依存する単純なセキュリティツールで内部関係者からの脅威や他の高度なサイバー攻撃を阻止できると期待することはできません。

この組織はドアアクセス制御ユニットの管理状態について可視性を持っていませんでした。それにも関わらず、そして攻撃のタイプやこのIoTデバイスに存在していた脆弱性について事前の知識を持っていなかったにも関わらず、Darktraceは動作の異常を即座に検知しました。Cyber AIを使用していなければ、感染はこの顧客の環境に何週間、何か月も存在しつづけ、権限をエスカレーションし、密かにクリプトマイニングを行い、機密性が高い企業データを抜き出していたかもしれないのです。

上記の脅威検知に対する知見を提供してくれたDarktraceアナリストGrace Carballo 氏に感謝します。

2021脅威レポートで内部関係者からの脅威について詳しく知る

Darktraceによるモデル検知:

  • Anomalous File/Anomalous Octet Stream
  • Anomalous Connection/New User Agent to IP Without Hostname
  • Unusual Activity/Unusual External Connectivity
  • Device/Increased External Connectivity
  • Anomalous Server Activity/Outgoing from Server
  • Device/New User Agent and New IP
  • Compliance/Cryptocurrency Mining Activity
  • Compliance/External Windows Connectivity
  • Anomalous File/Multiple EXE from Rare External Locations
  • Anomalous File/EXE from Rare External Location
  • Device/Large Number of Model Breaches
  • Anomalous File/Internet Facing System File Download
  • Device/Initial Breach Chain Compromise
  • Device/SMB Session Bruteforce
  • Device/Network Scan- Low Anomaly Score
  • Device/Large Number of Connections to New Endpoint
  • Anomalous Server Activity/Outgoing from Server
  • Compromise/Beacon to Young Endpoint
  • Anomalous Server Activity/Rare External from Server
  • Device/Multiple C2 Model Breaches
  • Compliance/Remote Management Tool on Server
  • Anomalous Connection/Data Sent to New External Device


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
Brianna Leddy
Director of Analysis

Based in San Francisco, Brianna is Director of Analysis at Darktrace. She joined the analyst team in 2016 and has since advised a wide range of enterprise customers on advanced threat hunting and leveraging Self-Learning AI for detection and response. Brianna works closely with the Darktrace SOC team to proactively alert customers to emerging threats and investigate unusual behavior in enterprise environments. Brianna holds a Bachelor’s degree in Chemical Engineering from Carnegie Mellon 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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