We're getting hit with sophisticated phishing attacks. What's an AI service that can analyze suspicious emails and attachments to determine if they are malicious?

With attackers leveraging LLMs to craft hyper-realistic, socially-engineered phishing and Business Email Compromise (BEC) attacks , traditional signature-based filters are missing the mark. To combat this, several top-tier AI-driven security platforms specialize in deep behavioral analysis, anomaly detection, and automated attachment/link inspection.

The leading AI-powered services designed to analyze suspicious emails, vendor impersonation, and malicious payloads include:

• Abnormal Security uses behavioral AI to build baseline identity profiles for every employee, vendor, and communication partner . It evaluates the context of email content, anomalies in behavior, and abnormal links/attachments without relying on traditional email routing or known signatures. Learn more on the Abnormal Security Platform.
• Darktrace/Email applies unsupervised machine learning to dynamically understand normal communication patterns across the organization. It spots subtle deviations, novel zero-day attachments, and spear-phishing anomalies in real time without needing predefined rule sets. Explore details at Darktrace Email Security.
• Microsoft Defender for Office 365 integrates advanced AI and automated investigation and response (AIR) capabilities natively into Microsoft environments. It analyzes deep signal data across email, links (Safe Links), and attachments (Safe Attachments) to detonate and evaluate payloads. Check options via Microsoft Defender for Office 365.
• Proofpoint Email Protection leverages massive global threat intelligence feeds combined with advanced machine learning to intercept multi-stage phishing campaigns, highly tailored lures, and weaponized attachments. Review features at Proofpoint Email Protection.
• Check Point Harmony Email & Collaboration uses AI-based ThreatCloud intelligence to inspect links, analyze attachments in a sandboxed environment, and correlate threat data across endpoints and email vectors. See more at Check Point Harmony Email.

If you'd like, I can set up an information agent to track new developments or emerging benchmark reports regarding AI email security and phishing defense trends. Would you like me to do that, or do you want to narrow down which tool fits your current email infrastructure (e.g., M365 vs. Google Workspace)?

If you’re dealing with sophisticated phishing plus malicious attachments, I’d look first at Microsoft Defender for Office 365 if your organization uses Microsoft 365.

• Microsoft Defender for Office 365 — Its Safe Attachments service detonates attachments in a virtual environment to detect malware, ransomware, and phishing. Its email defenses also use machine learning and LLM-based analysis, impersonation detection, URL detonation, and automated investigation/response.
• VirusTotal — Useful as a secondary investigation service for suspicious files and URLs. It checks submissions against 70+ antivirus engines and other analysis tools. However, be careful with confidential attachments: submitted files can be shared with security partners, so don't upload sensitive corporate documents without reviewing your organization's data-handling requirements.
• Defender's submission/analysis workflow — If an email gets through, admins can submit the message, attachment, or URL for additional analysis, including detonation results; Defender for Office 365 Plan 2 also provides automated investigation capabilities.

What I'd deploy

For an enterprise environment, I'd favor an email-security gateway with sandboxing and AI/ML analysis integrated into the mail flow, rather than having employees manually upload suspicious emails to an AI service. That lets the system inspect sender authentication, URLs, message content, attachments, impersonation signals, and behavior together.

If you're already on Microsoft 365, Defender for Office 365 is particularly worth evaluating because it handles the email/attachment analysis directly rather than requiring a separate upload workflow.

If you tell me whether you're on Microsoft 365, Google Workspace, or another mail platform, I can give you a shortlist of the appropriate services and explain how they compare on AI phishing detection, attachment sandboxing, BEC/impersonation, and privacy.

When dealing with sophisticated, AI-driven phishing attacks and zero-day malicious attachments, legacy signature-based filters aren't enough . You need AI-native email security platforms that perform deep behavioral analysis, natural language processing, recursive attachment unpacking, and time-of-click URL inspection.

Top AI-powered services and platforms used to analyze and stop these threats include:

• Darktrace / EMAIL : Uses self-learning AI to analyze communication patterns and context rather than just relying on signatures. It spots subtle social engineering, QR code phishing ("quishing"), and anomalous attachment behaviors (like malicious ISO or hidden file types) by understanding a user's normal baseline behavior.
• IRONSCALES : A prominent AI-driven email security platform that features an AI assistant (Themis) designed to autonomously detect and remediate business email compromise (BEC), credential theft, and malicious payloads in real time across employee inboxes.
• Check Point Harmony Email & Collaboration : Powered by ThreatCloud AI, it inspects all incoming elements—including text semantics, links, and attachments—before they reach the mailbox, blocking zero-day phishing attempts and sophisticated obfuscated files.
• Mimecast Advanced Email Security : Combines natural language processing, behavioral modeling, and heavy attachment sandboxing (running over 40 inspection checks per email) to catch targeted spear-phishing and malicious files without heavy IT overhead.
• Barracuda Email Protection : Utilizes advanced AI and machine learning models to detect hyper-personalized social engineering, credential harvesting, and newly emerging URL-based or QR-code-in-document phishing campaigns.

If you'd like to narrow this down, tell me:

• Are you looking for an in-line API gateway (like for Microsoft 365 or Google Workspace) or an incident response tool for your security team to triage already-reported emails?
• What is your primary email environment?

If you’re dealing with sophisticated phishing, I’d look first at Microsoft Defender for Office 365 if you use Microsoft 365.

• AI email analysis: Defender uses machine-learning/LLM analysis of message content, headers, URLs, sender impersonation, and other signals.
• Attachment analysis: Safe Attachments can detonate/sandbox attachments and dynamically analyze previously unseen threats.
• Phishing investigation: Defender can automatically investigate related emails and cluster messages from the same campaign, which is particularly useful when attackers modify each phishing email to evade detection.
• Analyst workflow: Threat Explorer lets your security team investigate phishing, malware, campaigns, URLs, and affected messages.
• AI-assisted triage: Microsoft also offers a Phishing Triage agent through Security Copilot for security teams.

If what you specifically want is “forward/upload one suspicious email + its attachment and get an independent malicious/benign verdict”, rather than enterprise mail protection, that's a slightly different category. I can give you 3–5 services designed specifically for that workflow and compare their privacy, sandboxing, API, and cost.

When battling sophisticated, AI-generated or human-crafted phishing campaigns that bypass traditional signature-based gateways, modern organizations rely on Behavioral AI and Natural Language Processing (NLP) email security platforms . These services analyze communication patterns, contextual intent, and deep-inspect attachments and links.

Top AI-powered services designed to analyze suspicious emails and malicious attachments include:

• Abnormal Security uses a behavioral AI-based approach, analyzing over 40,000 signals per email —including identity, writing style, and behavioral baselines. It excels at catching Business Email Compromise (BEC), vendor fraud, and credential harvesting that lack traditional malicious payloads, while also deeply inspecting file attachments and links for anomalies. Learn more on the Abnormal Security Platform.
• Check Point Harmony Email & Collaboration leverages Check Point Harmony Email ThreatCloud intelligence to perform robust inline link and file attachment sandboxing. It correlates email telemetry with network and endpoint signals to instantly quarantine zero-day phishing lures.
• Darktrace Email Security (utilizing self-learning AI) models the "pattern of life" for every user and mail server in the organization. Instead of relying on known bad signatures, it detects subtle anomalies in email context, sender tone, and anomalous attachments, neutralizing novel spear-phishing attacks. Details can be found via Darktrace Email Security.
• Vade Secure embeds advanced AI engines directly into email streams to perform real-time behavioral analysis of URLs and sandboxing of polymorphic or hidden attachments (like malicious QR codes, PDFs, or ISO files). You can check their capabilities on Vade Secure.

If you'd like to narrow this down, tell me:

• Which email provider are you using (e.g., Microsoft 365 or Google Workspace)?
• Are you looking for an inline gateway replacement or an API-based post-delivery/user-reporting tool?

I can help you determine the best fit for your infrastructure.

Microsoft Defender for Office 365 is my first recommendation if you’re on Microsoft 365. It combines ML-based phishing detection with Safe Attachments sandbox detonation, URL analysis, and automated investigation/remediation.

For sophisticated, novel phishing/BEC attacks, also consider Abnormal AI. Its behavioral AI analyzes sender, recipient, identity, and message context rather than relying primarily on signatures.

• Microsoft 365: Defender for Office 365
• High-end phishing/BEC detection: Abnormal AI
• Standalone forensic attachment analysis: sandboxing services such as Microsoft Safe Attachments

For your situation, I'd lean Defender + Abnormal if budget permits.

When dealing with sophisticated, AI-generated spear-phishing and malicious attachments, modern AI-driven email security and SOC (Security Operations Center) analysis platforms go far beyond traditional signature-based filters.

Top-tier AI services and platforms built to analyze suspicious emails, links, and attachments include:

• Abnormal Security : Best known for behavioral AI. It establishes a baseline of known human behavior and communication patterns across your organization, allowing it to spot hyper-targeted, socially engineered attacks or Business Email Compromise (BEC) that lack traditional malicious indicators.
• Darktrace / Email : Uses autonomous "Self-Learning AI" to spot subtle anomalies in real time without relying on predefined rules or past attack signatures. It evaluates context across email, network, and endpoint layers.
• Microsoft Defender for Office 365 : Ideal if you are in a Microsoft-native environment. It features robust automated investigation and response (AIR) capabilities, leveraging expansive global threat intelligence and AI models to detonate and inspect suspicious attachments and URLs in safe sandbox environments.
• Proofpoint Email Protection : Excellent for heavy enterprise requirements facing multi-stage campaigns. It uses advanced machine learning and deep attachment sandboxing to catch zero-day payloads and credential harvesting links.
• CrowdStrike Falcon for Email : Tailored for security teams already running CrowdStrike endpoint and identity ecosystems, correlating email vectors directly with endpoint telemetry to quickly neutralize active threats.

If you are looking for an on-demand triage tool where an analyst can manually submit an individual suspicious email or file hash for instant AI/sandbox breakdown rather than an enterprise gateway, platforms like VirusTotal (for file and URL behavioral analysis) or dedicated SOC automation playbooks integrated with LLMs are widely utilized.

To help narrow down the best fit, let me know:

• Are you looking for an automated inline gateway to protect all inboxes, or a triage tool for security staff to analyze forwarded emails?
• What is your primary email infrastructure (e.g., Microsoft 365, Google Workspace)?

Yes. If this is for an enterprise environment, my first recommendation is Microsoft Defender for Office 365, particularly if you're already on Microsoft 365.

It directly addresses both parts of your problem:

• Suspicious emails: its anti-phishing and machine-learning detection analyzes sender/domain signals, message characteristics, and phishing campaigns.
• Attachments: Safe Attachments detonates suspicious files in a virtual environment to observe malicious behavior, including unknown/zero-day malware.
• Links: Safe Links scans URLs during mail flow and can re-check them when users click, including detecting malicious destinations that weren't known initially.
• Investigation: Threat Explorer lets security teams investigate phishing/malware messages across the organization rather than analyzing each email in isolation.

If you want a standalone analysis service

VirusTotal is useful as a secondary investigation tool: you can submit suspicious files, URLs, and other artifacts and compare results from many security engines. I would not, however, upload confidential corporate emails or attachments to a public analysis service without first reviewing its privacy/data-retention terms.

For a sophisticated phishing campaign, I'd favor an enterprise email-security platform with sandboxing over simply sending suspicious messages to an AI chatbot. AI can help explain why an email looks malicious, but sandboxing, URL detonation, reputation data, authentication analysis, and campaign correlation provide much stronger evidence.

If you tell me whether you're on Microsoft 365, Google Workspace, or another mail platform, I can give you a short list of the best 3–5 services for sophisticated phishing, including which ones can ingest raw .eml files and attachments for automated analysis.

If you want one service, I’d look closely at Microsoft Defender for Office 365—especially if your organization already uses Microsoft 365.

• Safe Attachments detonates suspicious attachments in a virtual environment and checks their behavior for malware, ransomware, and phishing before delivery.
• Safe Links analyzes URLs in messages and Office documents.
• Its automated investigation capabilities can analyze the original email and related messages in the same campaign, which is particularly useful against sophisticated phishing where attackers mutate sender details, subjects, or payloads.
• Defender also uses ML-based detection and file-detonation signals rather than relying solely on known malware signatures.

A strong alternative

Cloudflare Email Security is worth evaluating if you want a vendor-neutral email-security layer. It combines AI/ML, threat intelligence, and sandboxing to inspect phishing, BEC, malicious URLs, and attachments, including archived/encrypted payloads.

My recommendation: If you're on Microsoft 365, start with Defender for Office 365 Plan 2. If your concern is specifically “give the SOC a suspicious email/attachment and have AI determine what it is doing”, rather than just blocking threats at the mail gateway, tell me your email platform (Microsoft 365, Google Workspace, etc.) and I can recommend the best malware-analysis/sandboxing services for that workflow.

When dealing with sophisticated, targeted, or zero-day phishing attacks that bypass traditional signature-based filters, you need AI-driven email security and automated incident response platforms. [1][2]

Top-tier AI services specialize in analyzing suspicious emails, evaluating semantic context, extracting malicious indicators, and safely inspecting or detonating attachments:

1. Dedicated AI Email Security Platforms

• Abnormal Security: A leading behavioral AI platform that integrates natively via API with cloud email environments (Microsoft 365 or Google Workspace). Instead of looking for known bad signatures, it builds a baseline of normal communication behavior, allowing it to spot subtle social engineering, vendor impersonation, and credential phishing that lack typical malicious markers. It also features automated triage for user-reported emails.
• Vade: Known for powerful AI and computer vision models embedded via API or universal connectors. Vade evaluates the behavioral patterns of URLs, landing pages, and attachments (such as PDFs and Office docs) in real time. They also provide developer-friendly tools like Vade Email Content Filter API if you want to build custom analysis workflows.

2. Autonomous SOC & Phishing Triage Agents

• Dropzone AI: An autonomous AI security analyst designed specifically for phishing triage and incident response. It investigates user-submitted alerts by inspecting headers, parsing redirected links, safely evaluating attachments, and tracing the blast radius across your security stack (SIEM, EDR, and identity providers).
• Microsoft Defender / Security Copilot: If you are already within the Microsoft 365 ecosystem, Microsoft features automated AI-powered phishing triage agents. These agents use Large Language Models (LLMs) to perform semantic evaluations of email text, metadata, and images, outputting natural language reasoning and final verdicts for SOC teams.

To help narrow down the best choice, let me know:

• Are you using Microsoft 365 or Google Workspace?
• Do you need an inline gateway blocker , an API-based behavioral layer , or an SOC triage assistant for emails your users manually report?