Zero-Click Attacks: The Silent Threat Targeting Enterprise AI and Messaging Systems

Zero-click cyberattacks have emerged as one of the most serious threats facing organisations today.

Unlike traditional attacks, which often require user interaction such as clicking on a malicious link or downloading harmful files, zero-click exploits can bypass user awareness entirely. This is what makes them a huge concern.  

In this guide, we’ll be sharing information about this relatively new stealthy cyber threat. We’ll be highlighting recent high-profile cases involving AI platforms and messaging apps and outlining the essential strategies you need to protect your business. 

Key Takeaways

• Zero-click attacks exploit vulnerabilities in software or AI tools without any user interaction, making them nearly invisible to traditional defences.
• AI-powered platforms like Microsoft Copilot and Google Gemini, along with messaging apps such as Outlook, iMessage, and WhatsApp, are top targets due to their high privilege and widespread use.
• Zero-click malware is the stealthy payload delivered via these attacks, often used to exfiltrate sensitive data from enterprise environments without triggering alerts.
• Real-world examples include the EchoLeak vulnerability (CVE-2025-32711) in Microsoft Copilot and Paragon Graphite spyware (CVE-2025-43200) via iMessage—both executed without user input.
• Detection is difficult—organisations must deploy AI-driven behavioural analytics, continuous threat monitoring, advanced vulnerability scanning, and AI-focused pen testing.
• Partnering with an MSSP and managed SOC ensures 24/7 threat detection, patching, and threat response—vital for defending against zero-click intrusions in today’s AI-enabled businesses.

What is a Zero-Click Cyberattack? 

A zero-click cyberattack is a sophisticated exploit that can infiltrate systems without any user interaction. Unlike phishing, ransomware, or malware, which typically requires a user clicking on links or opening attachments, zero-click attacks utilise hidden vulnerabilities to gain direct access to devices or networks. 

Their undetectable nature makes these attacks particularly challenging. Traditional detection systems like antivirus software or basic endpoint solutions often fail to spot these intrusions because the attack don’t rely on recognisable malicious actions by users. 

Instead, zero-click attacks exploit logic flaws or vulnerabilities within trusted applications, such as messaging apps or AI-powered productivity tools. 

We’re seeing a critical turning point for zero-click threats, driven largely by the increased adoption of AI technologies, and the widespread use of integrated communication platforms. All of this proves an urgent need for heightened vigilance and improved defensive strategies. 

Difference between a Zero-Click Attack and Zero-Click Malware 

While both terms sound similar, there are differences between zero-click attacks and zero-click malware. A zero-click attack refers broadly to the method of delivering an exploit or payload without requiring any user interaction, leveraging vulnerabilities within software or systems to gain unauthorised access. 

Zero-click malware specifically refers to malicious software designed to be installed silently onto a device or system without the user’s knowledge or any interaction. Once installed, this type of malware typically remains hidden, often silently extracting sensitive data or enabling further attacks without detection.  

Zero-click malware is often used as the payload delivered by zero-click attacks, illustrating their distinct roles in these cyber threat scenarios. Understanding this distinction is essential, as it helps you to accurately categorise the threats to your business and apply targeted defensive measures.  

Why Organisations Should Be Paying Close Attention to Zero-Click Attacks 

The adoption of AI tools such as Microsoft Copilot, Google Gemini, and advanced chatbots is surging in businesses across the world, significantly widening the attack surface for cybercriminals. Simultaneously, if you operate on a remote working basis or have an increased reliance on messaging platforms for daily communication among your workforce, you have added vulnerabilities that you must mitigate against. 

The UK’s National Cyber Security Centre (NCSC) emphasises the importance of proactive resilience, including patch management, rigorous threat modelling, and advanced threat hunting practices.  

Zero-click attacks pose a particular risk if you’re in a highly regulated sector such as defence, healthcare, and financial services, where a breach could compromise your critical data and infrastructure. 

Can zero-click attacks be detected? 

Detection is notoriously difficult because zero-click exploits don’t involve visible or detectable user actions. Traditional antivirus software, Endpoint Detection and Response (EDR), and Security Information and Event Management (SIEM) systems alone are insufficient without behavioural analytics. To detect these newly emerging threats, you need to implement anomaly detection and AI-driven threat monitoring in order to identify unusual patterns indicating a zero-click attack on your organisation. 

Which platforms are most vulnerable to zero-click exploits? 

Common targets include messaging apps like Outlook, iMessage, and WhatsApp. AI systems such as Microsoft 365 Copilot and Google Gemini, and mobile operating systems (particularly iOS and Android) often found in BYOD scenarios are also primary targets for cybercriminals.  

How Zero-Click Attacks Work: Tactics, Techniques and Procedures (TTPs) 

Common Attack Vectors 

Attack vectors used in zero-click attacks include: 

• Email and messaging applications: Platforms such as Outlook, WhatsApp, and iMessage are frequently exploited in zero-click attacks. This is mainly due to their widespread use and known vulnerabilities. 

• AI-driven productivity and collaboration tools: Advanced AI-powered systems such as Microsoft 365 Copilot and Google Gemini have become primary targets for cybercriminals looking to execute zero-click attacks due to their extensive access to sensitive internal data. 

• Integrated mobile platforms and applications: Mobile operating systems such as iOS and Android, especially in BYOD environments, provide additional entry points for zero-click attackers, as we saw in the iOS zero-click attack which was used to deliver Graphite spyware, covered above (CVE-2025-43200). 

Techniques Behind the Threat 

Zero-click attacks exploit vulnerabilities in software or hardware without requiring user action, enabling the attacker to execute malicious activities without detection. These attacks typically use automated interactions within trusted applications or operating systems. Attackers might exploit a logic flaw in the way an application processes incoming messages or files, enabling malicious code execution upon receipt alone. 

In practice, attackers will identify vulnerabilities through detailed reconnaissance and reverse-engineering processes, meticulously analysing applications for logic errors, memory handling flaws, or parsing errors. Once a vulnerability is identified, the attackers will craft highly specialised payloads that are delivered silently via standard application protocols. The victim’s application automatically processes this payload, such as a specially crafted message, media file, or document, triggering the vulnerability and allowing unauthorised access or malware installation without any indication to the user that an incident has occurred. 

Attackers use sophisticated and often stealthy techniques to execute zero-click exploits, including: 

• LLM Scope Violations and Prompt Injection Attacks: Attackers manipulate Large Language Models (LLMs) within AI assistants by embedding malicious prompts or payloads. A real-life example is the EchoLeak vulnerability (CVE-2025-32711) in Microsoft Copilot, where attackers crafted markdown-formatted emails that silently triggered data exfiltration via the AI’s Retrieval-Augmented Generation (RAG) engine. 

• Logic Errors in Media Parsing: Vulnerabilities in handling images, videos, or multimedia content are frequently exploited. For instance, Apple’s iMessage exploit (CVE-2025-43200) leveraged maliciously crafted media files, allowing spyware like Paragon Graphite to infiltrate devices silently, without any user interaction. 

• Exploiting Trusted Domains and Permissions: Attackers leverage existing trusted domains and inherent permissions within enterprise environments. By embedding malicious scripts or payloads within approved domains like Microsoft Teams, SharePoint, or GitHub, attackers effectively bypass security mechanisms designed to prevent unauthorised access, creating stealthy, powerful attack pathways. 

Real-world examples include the EchoLeak vulnerability in Microsoft Copilot, where attackers leveraged email markdown syntax to exploit AI model vulnerabilities silently, and Apple’s zero-click exploit, which utilised malicious media via iMessage to covertly install spyware. 

Zero-Click Attack: Microsoft Copilot EchoLeak Vulnerability 

What We Know About the Attack 

The EchoLeak vulnerability (CVE-2025-32711) exposed a critical flaw in Microsoft’s AI-powered Copilot tool. Attackers utilised markdown-formatted emails containing hidden prompts that triggered a Large Language Model (LLM) Scope Violation.  

This allowed attackers to silently extract sensitive data from an organisation’s Microsoft 365 ecosystem without any user interaction, including private documents from Teams, SharePoint, and OneDrive. 

Why It Matters for Businesses 

EchoLeak underscores the significant trust boundary issues presented by integrated AI assistants. The breach demonstrated the risk of unintended access to highly sensitive enterprise data through AI automation. Microsoft’s response included rapid patch deployment and broader security enhancements, reinforcing the necessity for constant vigilance and proactive security measures within enterprise IT. 

Zero-Click Attack: Apple iOS Zero-Click Flaw Used Against Journalists 

What We Know About the Attack 

Tracked as CVE-2025-43200, this exploit was actively utilised to install Paragon Graphite Spyware via Apple’s iMessage. The spyware activated without any visible notification, silently exfiltrating data, including emails, messages, and location information, from targeted devices. 

Why It Matters for Businesses 

This vulnerability reveals broader risks to enterprise environments where Apple devices are prevalent. The silent and undetectable nature of these spyware attacks represents severe risks, particularly if you operate in a remote or BYOD setting, extending the threat beyond individual users to your senior executives and critical business functions. 

Detection and Prevention: How Organisations Can Defend Themselves 

What steps can organisations take to protect against zero-click threats? 

To effectively combat zero-click threats, you must implement a defence-in-depth cyber security strategy encompassing advanced tools and services: 

• AI-Powered Threat Monitoring: Utilise AI-driven security platforms capable of behavioural analytics and anomaly detection, such as Microsoft Defender and CrowdStrike Falcon, and SentinelOne to identify subtle indicators of zero-click threats early. 

• Secure Configuration and Permissions: Strictly configure and regularly audit permissions for all AI tools and messaging platforms. Platforms such as Azure Security Center and AWS Security Hub can help enforce security baselines. 

• Behavioural Analytics and Anomaly Detection: Implement advanced SIEM and User and Entity Behaviour Analytics (UEBA) solutions, such as Microsoft Sentinel or USM Anywhere, to monitor user and system behaviours, flagging deviations indicative of compromise. 

• Regular Vulnerability Scanning: At a minimum you should be running continuous vulnerability scanning services to regularly identify and remediate potential entry points proactively before an attacker can exploit them. 

• AI-Focused Penetration Testing: Conduct specialised penetration tests designed explicitly for AI and integrated communication platforms, ensuring hidden vulnerabilities are identified and patched. 

Role of an MSSP and SOC 

Managed Security Service Providers (MSSPs) and Security Operations Centres (SOCs) play critical roles in defending against zero-click attacks.  

By implementing continuous monitoring for unusual behaviours, threat hunting specific to AI-enabled systems, proactive patch management, and immediate zero-day response, you can build a comprehensive defence strategy for your business. 

A Growing Attack Surface: What’s Next for Zero-Click Exploits? 

The threat landscape will expand with the rise of Advanced Tool Poisoning and Model Context Protocol (MCP) attacks targeting AI agents. Protecting AI systems that autonomously connect to external data is increasingly challenging, demanding rigorous runtime protections and segmented trust zones. 

Evolving regulatory frameworks such as DORA, NIS2, and the UK Government’s cyber strategy increasingly require robust defences and greater accountability. Organisations must adopt stringent guardrails to mitigate these risks proactively. 

Final Thoughts: Why Proactive Cybersecurity is Crucial 

Zero-click attacks represent a new advanced frontier in cyber security, challenging traditional defence mechanisms. With AI becoming essential to business operations, organisations must evolve their defences accordingly.  

DigitalXRAID’s managed SOC, penetration testing services, and other proactive managed security solutions offer you essential protection, ensuring you can confidently navigate this emerging threat landscape. Get in contact with the team today to see how we can support you.