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Introduction:
As cloud adoption accelerates, securing Microsoft 365 (M365) and Azure environments has become critical. Philip Perejda, an MXDR Threat Hunter at Sophos, recently reviewed “Attacking and Defending O365 & Azure,” a course designed to help professionals understand cloud attack techniques and mitigation strategies. This article dives into key offensive and defensive tactics, including hands-on commands, detection methods, and hardening measures for Azure and M365.
Learning Objectives:
- Understand common attack vectors in Azure and M365 environments.
- Learn detection techniques for identifying malicious activity in cloud logs.
- Apply defensive configurations to secure O365 and Azure tenants.
1. Enumerating Azure AD Users with PowerShell
Command:
Get-AzureADUser -All $true | Select-Object DisplayName, UserPrincipalName, ObjectId
What It Does:
This PowerShell command retrieves all users in an Azure Active Directory (Azure AD) tenant, including their display names, UPNs, and object IDs—a common reconnaissance step for attackers.
How to Use It:
1. Install the `AzureAD` module:
Install-Module -Name AzureAD
2. Connect to Azure AD:
Connect-AzureAD
3. Run the enumeration command to list users.
Defensive Tip:
Enable Azure AD Privileged Identity Management (PIM) to enforce Just-In-Time (JIT) access and reduce exposure.
2. Detecting Suspicious M365 Logins with KQL
Kusto Query (Azure Sentinel):
SigninLogs
| where ResultType == "0"
| where AppDisplayName !in ("Office 365 Exchange Online", "Microsoft Azure Portal")
| project TimeGenerated, UserPrincipalName, IPAddress, AppDisplayName
What It Does:
This query identifies successful logins (ResultType 0) from non-standard applications, which may indicate compromised credentials.
How to Use It:
1. Navigate to Azure Sentinel > Logs.
2. Run the query and investigate anomalous logins.
Mitigation:
Enable Conditional Access Policies to restrict access based on location, device, and application.
3. Exploiting Misconfigured Azure Storage Blobs
Command (Azure CLI):
az storage blob list --account-name <storage_account> --container-name <container> --auth-mode login
What It Does:
Lists blobs in a storage container. Attackers exploit publicly accessible blobs to steal sensitive data.
How to Secure It:
1. Set Blob Public Access Level to Private.
2. Enable Storage Account Firewalls to restrict access.
4. Hunting for O365 Phishing with Advanced Hunting
M365 Defender Query:
EmailEvents | where EmailDirection == "Inbound" | where Subject contains "Urgent: Action Required" | join (EmailAttachmentInfo) on NetworkMessageId | where FileType == "html" or FileType == "exe"
What It Does:
Finds phishing emails with malicious attachments or deceptive subjects.
Response:
- Quarantine suspicious emails using Threat Explorer.
- Train users with Attack Simulator.
5. Securing Azure VMs with Just-In-Time Access
Azure CLI Command:
az security jit-policy create --name "Default" --location "eastus" --resource-group "MyRG" --vm-name "MyVM" --ports "22,3389" --duration "PT3H"
What It Does:
Restricts RDP/SSH access to Azure VMs, opening ports only when needed.
Best Practice:
Combine with Network Security Groups (NSGs) for layered security.
What Undercode Say:
- Key Takeaway 1: Attackers increasingly target misconfigured cloud services—continuous monitoring is essential.
- Key Takeaway 2: Detection alone isn’t enough; proactive hardening (e.g., JIT access, Conditional Access) is critical.
Analysis:
As cloud environments grow, so does the attack surface. Courses like Attacking and Defending O365 & Azure bridge the gap between offensive tactics and defensive strategies, equipping professionals to combat real-world threats. Organizations must prioritize logging, least-privilege access, and automated threat hunting to stay ahead.
Prediction:
With AI-driven attacks (e.g., deepfake phishing) on the rise, cloud security will increasingly rely on behavioral analytics and zero-trust frameworks. Expect tighter integration between Azure Sentinel, Defender, and third-party XDR solutions in 2024.
Final Thought: Whether you’re a defender or a red teamer, mastering Azure/M365 security is non-negotiable. Enroll in specialized training—your cloud infrastructure depends on it.
🎯Let’s Practice For Free:
IT/Security Reporter URL:
Reported By: Philipperejda Just – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
