ブログ
/
Network
/
October 20, 2025

Salt Typhoon侵入事例に対するダークトレースの視点

中国に関係のあるサイバー諜報グループ、Salt TyphoonがDLLサイドローディングやゼロデイエクスプロイト等のステルス手法を使って世界的なインフラを狙っていることが確認されました。ダークトレースは最近Salt Typhoonの戦術と一致する初期の侵入アクティビティを検知しました。これは国家が支援する執拗な脅威に対する防御において従来のシグネチャベースの手法ではなく異常ベースの検知が重要であることを裏付けています。
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
Nathaniel Jones
VP, Security & AI Strategy, Field CISO
Written by
Sam Lister
Specialist Security Researcher
Default blog imageDefault blog imageDefault blog imageDefault blog imageDefault blog imageDefault blog image
20
Oct 2025

Salt Typhoonとは?

Salt Typhoonは、現在世界のインフラを狙っている最も執拗かつ巧妙なサイバー脅威の1つです。国家が支援する中国のアクターとされるこのAPT(Advanced Persistent Threat)グループは、主に米国の通信プロバイダー、エネルギーネットワーク、政府システムを標的とした、ー連のインパクトの大きいキャンペーンを実行しています。

少なくとも2019年から活動しており、Earth Estries、GhostEmperor、UNC2286としても記録されているこのグループは、エッジデバイスのエクスプロイトに高度な能力を示し、深い永続性を維持しつつ80か国以上において機密性の高いデータの抜き出しを行っています。公になっている被害の報告はほとんど米国の標的に集中していますが、Salt TyphoonのオペレーションはEMEA(ヨーロッパ、中東、アフリカ)地域にも拡大し、通信、政府機関、テクノロジー企業等が標的とされています。カスタムマルウェアの使用、およびインパクトの大きい脆弱性のエクスプロイト(例: Ivanti、Fortinet、Cisco等)は、インテリジェンス収集と地政学的影響を組み合わせたこのグループの戦略的性質を表しています [1]。

ゼロデイエクスプロイト、難読化テクニック、水平移動戦術を駆使することにより、Salt Typhoonは検知を回避し機密性の高い環境に長期間のアクセスを維持することのできる、恐るべき能力を実証しています。このグループのオペレーションにより合法的傍受システムが露出し、数百万のユーザーのメタデータが漏洩、必要不可欠なサービスの中断を招き、世界中で情報機関と民間パートナーの協調した対応が促されました。組織が自社の脅威モデルを評価するなかで、Salt Typhoonは国家が支援するサイバーオペレーションの進化と、積極的な防御戦略が緊急に必要であることをはっきりと思い出させる存在です。

Darktraceのカバレッジ

Darktraceはヨーロッパの通信企業において、DLLサイドローディングと正規のソフトウェアの悪用によるステルス性維持と実行を含む、Salt Typhoonのものとして知られているTTP(戦術、技法、手順)を確認しました。

初期アクセス

侵入は2025年7月、CVE-2025-5777のエクスプロイトから始まりました。これはCitrix NetScaler Gatewayアプライアンスに影響する脆弱性です。脅威アクターはここから、クライアントのMCS(Machine Creation Services)サービス内の Citrix VDA(Virtual Delivery Agent)ホストに移動しました。この侵入の初期のアクセス活動はSoftEther VPNサービスと関連するとみられるエンドポイントから発生しており、最初からインフラ難読化が行われていたことがわかります。

ツール

Darktraceはその後、この脅威アクターが複数のCitrix VDAホストに対し、高い確率でSNAPPYBEE(Deed RATとしても知られる) [2][3] であるとみられるバックドアを設置したことを検知しました。このバックドアはこれらの内部エンドポイントに対して、Norton Antivirus、Bkav Antivirus、IObit Malware Fighterなどのアンチウイルスソフトウェアの正規の実行形式ファイルと共にDLLとして仕掛けられました。このアクティビティのパターンは、攻撃者が正規のアンチウイルスソフトウェアを使ったDLLサイドローディングによりペイロードを実行しようとしたことを示しています。Salt Typhoonおよび類似のグループは過去にもこのテクニックを使用してきており[4][5]、これにより信頼されるソフトウェアの陰でペイロードを実行し従来型のセキュリティコントロールを回避することを可能にしています。

コマンド&コントロール(C2)

この脅威アクターが設置したバックドアはLightNode VPSエンドポイントをC2に使用し、HTTPと不明なTCPベースのプロトコルの両方を使って通信していました。このように二重のチャネルを使っていることは、Salt Typhoonが非標準プロトコルを多層的に使用して検知を回避することで知られていることと一致しています。バックドアに表示されたHTTP通信には、Internet Explorerの User-Agentヘッダーを持つPOSTリクエストや“/17ABE7F017ABE7F0” のようなTarget URIパターンが含まれていました。侵害されたエンドポイントが接続したC2ホストの1つはaar.gandhibludtric[.]com (38.54.63[.]75)であり、最近Salt Typhoonとの関連が確認されたドメインです[6]。

検知のタイムライン

Darktraceは侵入の初期段階に対して高確度の検知結果を生成しました。初期のツール使用とC2アクティビティは、Darktrace Cyber AI AnalystTMによる調査と、Darktraceのモデルの両方によって明確にカバーされていました。脅威アクターが高度であったにもかかわらず、侵入アクティビティはこれらの攻撃の初期段階から先へ進展する前に識別され、修正されました。Darktraceのタイムリーかつ高確度の検知が脅威の無害化に重要な役割を果たしたものと思われます。

Cyber AI Analystの知見

Darktrace Cyber AI Analyst は侵入の初期段階においてDarktraceが検知したモデルアラートを自律的に調査しました。この調査を通じ、Cyber AI Analystは初期のツール使用とC2イベントを突き止め、これらをつなぎ合わせて攻撃の進行を表す1つのインシデントにまとめました。

Cyber AI Analyst weaved together separate events from the intrusion into broader incidents summarizing the attacker’s progression.
図1: Cyber AI Analystは侵入アクティビティからの個別のイベントをつなぎ合わせて全体のインシデントを作成し、攻撃の進行状況を示しました。

まとめ

TTPやステージングパターン、インフラ、マルウェアの共通点に基づき、ダークトレースは一定の確信を持って観察されたアクティビティがSalt Typhoon/Earth Estries (ALA GhostEmperor/UNC2286)と一致していると評価しました。Salt Typhoonは引き続きそのステルス性、永続性、正規ツールの悪用によって防御者を悩ませています。攻撃者が通常のオペレーションに紛れ込もうとする傾向が高まるなかで、かすかな逸脱を識別し分散したシグナルを相関付けるには、動作の異常を検知することが不可欠となります。Salt Typhoonの特徴である変化する手法、そして信頼されるソフトウェアやインフラを別の目的に使用する能力により、従来の手法だけでは今後も検知が難しいことが確実です。この侵入インシデントは積極的な防御の重要性を示しており、そこではシグネチャの照合だけにとどまらない異常ベースの検知が、初期段階のアクティビティを明らかにする上で決定的な役割を果たします。

本稿の執筆には Nathaniel Jones (VP, Security & AI Strategy, FCISO)、Sam Lister(Specialist Security Researcher)、Emma Foulger(Global Threat Research Operations Lead)、Adam Potter(Senior Cyber Analystが協力しました。

編集:Ryan Traill(Analyst Content Lead)

付録

侵害インジケータ(IoC)

IoC-タイプ-説明 + 確度

89.31.121[.]101 – IP Address – Possible C2 server

hxxp://89.31.121[.]101:443/WINMM.dll - URI – Likely SNAPPYBEE download

b5367820cd32640a2d5e4c3a3c1ceedbbb715be2 - SHA1 – Likely SNAPPYBEE download

hxxp://89.31.121[.]101:443/NortonLog.txt - URI - Likely DLL side-loading activity

hxxp://89.31.121[.]101:443/123.txt - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/123.tar - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/pdc.exe - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443//Dialog.dat - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/fltLib.dll - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/DisplayDialog.exe - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/DgApi.dll - URI - Likely DLL side-loading activity

hxxp://89.31.121[.]101:443/dbindex.dat - URI - Likely DLL side-loading activity

hxxp://89.31.121[.]101:443/1.txt - URI - Possible DLL side-loading activity

hxxp://89.31.121[.]101:443/imfsbDll.dll – Likely DLL side-loading activity

hxxp://89.31.121[.]101:443/imfsbSvc.exe - URI – Likely DLL side-loading activity

aar.gandhibludtric[.]com – Hostname – Likely C2 server

38.54.63[.]75 – IP – Likely C2 server

156.244.28[.]153 – IP – Possible C2 server

hxxp://156.244.28[.]153/17ABE7F017ABE7F0 - URI – Possible C2 activity

MITRE TTP

テクニック | 説明

T1190 | Exploit Public-Facing Application - Citrix NetScaler Gateway compromise

T1105 | Ingress Tool Transfer – Delivery of backdoor to internal hosts

T1665 | Hide Infrastructure – Use of SoftEther VPN for C2

T1574.001 | Hijack Execution Flow: DLL – Execution of backdoor through DLL side-loading

T1095 | Non-Application Layer Protocol – Unidentified application-layer protocol for C2 traffic

T1071.001| Web Protocols – HTTP-based C2 traffic

T1571| Non-Standard Port – Port 443 for unencrypted HTTP traffic

侵入時のDarktraceモデルアラート

Anomalous File::Internal::Script from Rare Internal Location

Anomalous File::EXE from Rare External Location

Anomalous File::Multiple EXE from Rare External Locations

Anomalous Connection::Possible Callback URL

Antigena::Network::External Threat::Antigena Suspicious File Block

Antigena::Network::Significant Anomaly::Antigena Significant Server Anomaly Block

Antigena::Network::Significant Anomaly::Antigena Controlled and Model Alert

Antigena::Network::Significant Anomaly::Antigena Alerts Over Time Block

Antigena::Network::External Threat::Antigena File then New Outbound Block  

参考文献

[1] https://www.cisa.gov/news-events/cybersecurity-advisories/aa25-239a

[2] https://www.trendmicro.com/en_gb/research/24/k/earth-estries.html

[3] https://www.trendmicro.com/content/dam/trendmicro/global/en/research/24/k/earth-estries/IOC_list-EarthEstries.txt

[4] https://www.trendmicro.com/en_gb/research/24/k/breaking-down-earth-estries-persistent-ttps-in-prolonged-cyber-o.html

[5] https://lab52.io/blog/deedrat-backdoor-enhanced-by-chinese-apts-with-advanced-capabilities/

[6] https://www.silentpush.com/blog/salt-typhoon-2025/

このブログで提供されるコンテンツはダークトレースが一般的な情報提供の目的でのみ公開するものであり、サイバーセキュリティに関するトピック、傾向、インシデント、出来事についての、公開の時点における当社の理解を反映したものです。当社は内容の正確性と重要性の担保に努めていますが、情報は明示的暗黙的を問わず、何らの表明あるいは保証も伴わわない「そのまま」の状態で提供されるものです。ダークトレースは本書に含まれる情報の完全性、正確性、信頼性、適時性について何らの責任も負わず、すべての保証を明示的に否認します。

本ブログに含まれるいかなる内容も法的、技術的、技術的助言を構成するものではなく、読者は本書に含まれる情報に基づいて行動する前に資格を持った専門家に相談されることをお勧めします。第三者の組織、技術、脅威アクター、インシデントに対する言及は情報目的のみであり、提携、承認、推奨を暗に意味するものではありません。

ダークトレース、その関連会社、従業員、あるいは代理人は、本ブログの情報の使用またはこれに対する信頼により生じた、いかなる損失、損害、危害についても責任を負いません。

サイバーセキュリティを取り巻く環境は急激に変化しており、ブログの内容は古くなるあるいは新しいものに代替される可能性があります。当社は任意のコンテンツを更新、変更、あるいは削除する権利を留保します。

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
Nathaniel Jones
VP, Security & AI Strategy, Field CISO
Written by
Sam Lister
Specialist Security Researcher

More in this series

No items found.

Blog

/

AI

/

May 12, 2026

Resilience at the Speed of AI: Defending the Modern Campus with Darktrace

Default blog imageDefault blog image

Why higher education is a different cybersecurity battlefield

After four decades in IT, now serving as both CIO and CISO, I’ve learned one simple truth: cybersecurity is never “done.” It’s a constant game of cat and mouse. Criminals evolve. Technologies advance. Regulations expand. But in higher education, the challenge is uniquely complex.

Unlike a bank or a military installation, we can’t lock down networks to a narrow set of approved applications. Higher education environments are open by design. Students collaborate globally, faculty conduct cutting-edge research, and administrators manage critical operations, all of which require seamless access to the internet, global networks, cloud platforms, and connected systems.

Combine that openness with expanding regulatory mandates and tight budgets, and the balancing act becomes clear.

Threat actors don’t operate under the same constraints. Often well-funded and sponsored by nation-states with significant resources, they’re increasingly organized, strategic, and innovative.

That sophistication shows up in the tactics we face every day, from social engineering and ransomware to AI-driven impersonation attacks. We’re dealing with massive volumes of data, countless signals, and a very small window between detection and damage.

No human team, no matter how talented or how numerous, can manually sift through that noise at the speed required.

Discovering a force multiplier

Nothing in cybersecurity is 100% foolproof. I never “set it and forget it.” But for institutions balancing rising threats and finite resources, the Darktrace ActiveAI Security Platform™ offers something incredibly valuable: peace of mind through speed and scale.

It closes the gap between detection and response in a way humans can’t possibly match. At the speed of light, it can quarantine, investigate, and contain anomalous activity.

I’ve purchased and deployed Darktrace three separate times at three different institutions because I’ve seen firsthand what it can do and what it enables teams like mine to achieve.

I first encountered Darktrace while serving as CIO for a large multi-campus college system. What caught my attention was Darktrace's Self-Learning AI, and its ability to learn what "normal" looked like across our network. Instead of relying solely on static signatures or rigid rules, Darktrace built a behavioral baseline unique to our environment and alerted us in real time when something simply didn’t look right.

In higher education, where strict lockdowns aren’t realistic, that behavioral model made all the difference. We deployed it across five campuses, and the impact was immediate. Operating 24/7, Darktrace surfaced threats in ways our team couldn’t replicate manually.

Over time, the Darktrace platform evolved alongside the changing threat landscape, expanding into intrusion prevention, cloud visibility, and email security. At subsequent institutions, including Washington College, Darktrace was one of my first strategic investments.

Revealing the hidden threat other tools missed

One of the most surprising investigations of my career involved a data leak. Leadership suspected sensitive information from high-level meetings was being exposed, but our traditional tools couldn’t provide any answers.

Using Darktrace’s deep network visibility, down to packet-level data, we traced unusual connections to our CCTV camera system, which had been configured with a manufacturer’s default password. A small group of employees had hacked into the CCTV cameras, accessed audio-enabled recordings from boardroom meetings, and stored copies locally.

No other tool in our environment could have surfaced those connections the way Darktrace did. It was a clear example of why using AI to deeply understand how your organization, systems, and tools normally behave, matters: threats and risks don’t always look the way we expect.

Elevating a D-rating into a A-level security program

When I arrived at my last CISO role, the institution had recently experienced a significant ransomware attack. Attackers located  data  which informed their setting  ransom demands to an amount they knew would likely result in payment. It was a sobering example of how calculated and strategic modern cybercriminals have become.

Third-party cyber ratings reflected that reality, with a  D rating.

To raise the bar, we implemented a comprehensive security program and integrated layered defenses; -deploying state of the art tools and methods-  across the environment, with Darktrace at its core.

After a 90-day learning period to establish our behavioral baseline, we transitioned the platform into fully autonomous mode. In a single 30-day span, Darktrace conducted more than 2,500 investigations and autonomously resolved 92% of all false positives.

For a small team, that’s transformative. Instead of drowning in alerts, my staff focused on less than  200 meaningful cases that warranted human review.

Today, we maintain a perfect A rating from third-party assessors and have remained cybersafe.

Peace of mind isn’t about complacency

The effect of Darktrace as a force multiplier has a real human impact.

With the time reclaimed through automation, we expanded community education programs and implemented simulated phishing exercises. Through sustained training and awareness efforts, we reduced social engineering susceptibility from nearly 45% to under 5%.

On a personal level, Darktrace allows me to sleep better at night and take time off knowing we have intelligent systems monitoring and responding around the clock. For any CIO or CISO carrying institutional risk on their shoulders, that matters.

The next era: AI vs. AI

A new chapter in cybersecurity is unfolding as adversaries leverage AI to enhance scale, speed, and believability. Phishing campaigns are more personalized, impersonation attempts are more precise, and deepfake video technology, including live video, is disturbingly authentic. At the same time, organizations are rapidly adopting AI across their own environments —from GenAI assistants to embedded tools to autonomous agents. These systems don’t operate within fixed rules. They act across email, cloud, SaaS, and identity systems, often with broad permissions, and their behavior can evolve over time in ways that are difficult to predict or control.

That creates a new kind of security challenge. It’s not just about defending against AI-powered threats but understanding and governing how AI behaves within your environment, including what it can access, how it acts, and where risk begins to emerge.

From my perspective, this is a natural next step for Darktrace.

Darktrace brings a level of maturity and behavioral understanding uniquely suited to the complexity of AI environments. Self-Learning AI learns the normal patterns of each business to interpret context, uncover subtle intent, and detect meaningful deviations without relying on predefined rules or signatures. Extending into securing AI by bringing real-time visibility and control to GenAI assistants, AI agents, development environments and Shadow AI, feels like the logical evolution of what Darktrace already does so well.

Just as importantly, Darktrace is already built for dynamic, cross-domain environments where risk doesn’t sit in a single tool or control plane. In higher education, activity already spans multiple systems and, with AI, that interconnection only accelerates.

Having deployed Darktrace multiple times, I have confidence it’s uniquely positioned to lead in this space and help organizations adopt AI with greater visibility and control.

---

Since authoring this blog, Irving Bruckstein has transitioned to the role of Chief Executive Officer of the Cyberaigroup.

Continue reading
About the author
Irving Bruckstein
CEO CyberAIgroup

Blog

/

AI

/

May 11, 2026

The Next Step After Mythos: Defending in a World Where Compromise is Expected

Default blog imageDefault blog image

Is Anthropic’s Mythos a turning point for cybersecurity?

Anthropic’s recent announcements around their Mythos model, alongside the launch of Project Glasswing, have generated significant interest across the cybersecurity industry.

The closed-source nature of the Mythos model has understandably attracted a degree of skepticism around some of the claims being made. Additionally, Project Glasswing was initially positioned as a way for software vendors to accelerate the proactive discovery of vulnerabilities in their own code; however, much of the attention has focused on the potential for AI to identify exploitable vulnerabilities for those with malicious intent.

Putting questions around the veracity of those claims to one side – which, for what it’s worth, do appear to be at least partially endorsed by independent bodies such as the UK’s AI Security Institute – this should not be viewed as a critical turning point for the industry. Rather, it reflects the natural direction of travel.

How Mythos affects cybersecurity teams  

At Darktrace, extolling the virtues of AI within cybersecurity is understandably close to our hearts. However, taking a step back from the hype, we’d like to consider what developments like this mean for security teams.

Whether it’s Mythos or another model yet to be released, it’s worth remembering that there is no fundamental difference between an AI discovered vulnerability and one discovered by a human. The change is in the pace of discovery and, some may argue, the lower the barrier to entry.

In the hands of a software developer, this is unquestionably positive. Faster discovery enables earlier remediation and more proactive security. But in the hands of an attacker, the same capability will likely lead to a greater number of exploitable vulnerabilities being used in the wild and, critically, vulnerabilities that are not yet known to either the vendor or the end user.

That said, attackers have always been able to find exploitable vulnerabilities and use them undetected for extended periods of time. The use of AI does not fundamentally change this reality, but it does make the process faster and, unfortunately, more likely to occur at scale.

While tools such as Darktrace / Attack Surface Management and / Proactive Exposure Management  can help security teams prioritize where to patch, the emergence of AI-driven vulnerability discovery reinforces an important point: patching alone is not a sufficient control against modern cyber-attacks.

Rethinking defense for a world where compromise is expected

Rather than assuming vulnerabilities can simply be patched away, defenders are better served by working from the assumption that their software is already vulnerable - and always will be -and build their security strategy accordingly.

Under that assumption, defenders should expect initial access, particularly across internet exposed assets, to become easier for attackers. What matters then is how quickly that foothold is detected, contained, and prevented from expanding.

For defenders, this places renewed emphasis on a few core capabilities:

  • Secure-by-design architectures and blast radius reduction, particularly around identity, MFA, segmentation, and Zero Trust principles
  • Early, scalable detection and containment, favoring behavioral and context-driven signals over signatures alone
  • Operational resilience, with the expectation of more frequent early-stage incidents that must be managed without burning out teams

How Darktrace helps organizations proactively defend against cyber threats

At Darktrace, we support security teams across all three of these critical capabilities through a multi-layered AI approach. Our Self-Learning AI learns what’s normal for your organization, enabling real-time threat detection, behavioral prediction, incident investigation and autonomous response. - all while empowering your security team with visibility and control.

To learn more about Darktrace’s application of AI to cybersecurity download our White Paper here.  

Reducing blast radius through visibility and control

Secure-by-design principles depend on understanding how users, devices, and systems behave. By learning the normal patterns of identity and network activity, Darktrace helps teams identify when access is being misused or when activity begins to move beyond expected boundaries. This makes it possible to detect and contain lateral movement early, limiting how far an attacker can progress even after initial access.

Detecting and containing threats at the earliest stage  

As AI accelerates vulnerability discovery, defenders need to identify exploitation before it is formally recognized. Darktrace’s behavioral understanding approach enables detection of subtle deviations from normal activity, including those linked to previously unknown vulnerabilities.

A key example of this is our research on identifying cyber threats before public CVE disclosures, demonstrating that assessing activity against what is normal for a specific environment, rather than relying on predefined indicators of compromise, enables detection of intrusions exploiting previously unknown vulnerabilities days or even weeks before details become publicly available.

Additionally, our Autonomous Response capability provides fast, targeted containment focused on the most concerning events, while allowing normal business operations to continue. This has consistently shown that even when attackers use techniques never seen before, Darktrace’s Autonomous Response can contain threats before they have a chance to escalate.

Scaling response without increasing operational burden

As early-stage incidents become more frequent, the ability to investigate and respond efficiently becomes critical. Darktrace’s Cyber AI Analyst’s AI-driven investigation capabilities automatically correlate activity across the environment, prioritizing the most significant threats and reducing the need for manual triage. This allows security teams to respond faster and more consistently, without increasing workload or burnout.

What effective defense looks like in an AI-accelerated landscape

Developments like Mythos highlight a reality that has been building for some time: the window between exposure and exploitation is shrinking, and in many cases, it may disappear entirely. In that environment, relying on patching alone becomes increasingly reactive, leaving little room to respond once access has been established.

The more durable approach is to assume that compromise will occur and focus on controlling what happens next. That means identifying early signs of misuse, containing threats before they spread, and maintaining visibility across the environment so that isolated signals can be understood in context.

AI plays a role on both sides of this equation. While it enables attackers to move faster, it also gives defenders the ability to detect subtle changes in behavior, prioritize what matters, and respond in real time. The advantage will not come from adopting AI in isolation, but from applying it in a way that reduces the gap between detection and action.

AI may be accelerating parts of the attack lifecycle, but the fundamentals of defense, detection, and containment still apply. If anything, they matter more than ever – and AI is just as powerful a tool for defenders as it is for attackers.

To learn more about Darktrace and Mythos read more on our blog: Mythos vs Ethos: Defending in an Era of AI‑Accelerated Vulnerability Discovery

[related-resource]

Continue reading
About the author
Toby Lewis
Head of Threat Analysis
あなたのデータ × DarktraceのAI
唯一無二のDarktrace AIで、ネットワークセキュリティを次の次元へ