Account Takeover Attacks: How to Shield Your Cloud Workspace

TL;DR

Understanding Account Takeover in the Cloud

What is an Account Takeover Attack?

An account takeover attack happens when a cybercriminal gains unauthorized access to a user’s account—often by stealing login credentials through phishing, brute-force attacks, or malware. Once inside, attackers can:

• Steal sensitive data
• Launch internal phishing campaigns
• Manipulate permissions to escalate their access
• Disrupt business operations

Imagine a finance manager’s email account being compromised. The attacker quietly monitors communications, then sends a convincing request to transfer funds to a fraudulent account. The result: financial loss and a major trust issue.

Why Are Cloud Workspaces a Prime Target?

Cloud platforms centralize business-critical data and collaboration tools, making them attractive to attackers who know that a single compromised account can unlock a treasure trove of information. With remote work and BYOD (bring your own device) policies, the attack surface has only grown.

How do Modern Account Takeover Attacks Target Cloud Workspaces?

Common Attack Vectors

Attackers use a mix of tactics to compromise cloud accounts, most commonly:

• Phishing emails that trick users into revealing credentials
• Brute-force attacks that guess weak passwords
• Exploiting reused passwords from previous breaches
• Social engineering to bypass multi-factor authentication (MFA)

How Attackers Move Laterally

Once inside, attackers often:

• Search for sensitive files in cloud storage
• Manipulate email rules to hide their activity
• Attempt to access other connected applications

Why Isn't Strong MFA Enough to Stop Account Takeover?

Limitations of Legacy Tools

Many organizations rely on traditional security tools like secure email gateways (SEGs) or basic MFA. While these are helpful, they often:

• Miss sophisticated phishing attacks that bypass email filters
• Fail to detect abnormal behavior after login
• Struggle to provide unified visibility across multiple cloud platforms

The Challenge of Manual Response

Security teams are often overwhelmed by alerts and lack the context to prioritize real threats. Manual investigation and remediation can take hours or days—giving attackers plenty of time to do damage.

What Controls Actually Shield Google Workspace and Microsoft 365 From ATO?

Behavioral Analytics and AI

Modern solutions use artificial intelligence (AI) to build a baseline of normal user behavior. By monitoring for anomalies—like logins from unusual locations or sudden changes in email activity—these tools can quickly flag and contain suspicious activity.

Unified Visibility Across Cloud Apps

API-based security platforms integrate directly with cloud services, providing:

• Centralized monitoring of user activity
• Real-time detection of risky behavior
• Automated response to contain threats

Key Features to Look For

• Automated session termination and access revocation
• Contextual timelines of suspicious events
• Cross-platform identity monitoring
• Threat intelligence aggregation for faster incident response

Example: How Automated Remediation Works

1. AI detects a login from an unusual location.
2. The system automatically terminates the session and revokes access.
3. Security teams receive a detailed timeline of events for investigation.

Best Practices for Account Takeover Prevention

Proactive Steps You Can Take

• Enforce strong, unique passwords for all users
• Require multi-factor authentication (MFA) everywhere possible
• Regularly review and limit permissions for sensitive data
• Educate employees about phishing and social engineering
• Use automated tools to monitor for abnormal behavior and risky logins [1]

Data Loss Prevention (DLP) in Cloud Email

DLP tools help prevent sensitive information from leaving your organization by:

• Scanning emails and attachments for confidential data
• Blocking or quarantining risky messages
• Classifying data to apply the right security controls

Material Security: Purpose-Built Protection for Cloud Workspaces

Material Security offers a unified detection and response platform designed specifically for Google Workspace and Microsoft 365. By combining email security, data protection, identity threat detection, and configuration management, Material Security helps organizations:

• Detect and contain account takeover attempts in real time
• Automate remediation without disrupting productivity
• Gain full visibility into user activity and permissions
• Protect sensitive data across email, files, and identities

“Material Security automates remediation of security issues while maintaining productivity and collaboration capabilities.”

Take Control of Your Cloud Security

Account takeover attacks aren’t going away. But with the right approach, you can protect your cloud workspace and keep your business running smoothly. If you’re ready to see how automated detection and response can shield your organization from ATO threats, explore how Material Security can help.

Ready to secure your cloud workspace?
Contact Material Security for a personalized demo or learn more about our unified platform at material.security.

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References

1. Account Takeover Prevention: How to Prevent ATO & Mitigate Fraud

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