The 5 Microsoft Security Commands Every Admin Must Master to Stop the Next Breach

By /

Listen to this Post

Featured Image

Introduction:

In the modern threat landscape, proactive security configuration is no longer optional. With identity-based attacks and cloud misconfigurations representing the most common attack vectors, mastering native Microsoft security tools is critical for defense. This guide provides the essential commands to harden your environment immediately.

Learning Objectives:

  • Audit and secure Microsoft Entra ID (Azure AD) configurations to prevent identity compromise.
  • Implement advanced Microsoft Defender policies for endpoint detection and response (EDR).
  • Utilize Microsoft Purview for data loss prevention (DLP) and compliance auditing.
  • Harden Microsoft 365 tenant settings against common exploitation techniques.
  • Automate security posture assessment and remediation with PowerShell.

You Should Know:

  1. Audit Entra ID for Risky Applications and Grants
    `Get-AzureADServicePrincipal | Where-Object {$.KeyCredentials -ne $null} | Select-Object DisplayName, AppId, KeyCredentials`
    This PowerShell command, run from the AzureAD module, lists all application service principals (enterprise apps) that have credential keys (certificates or secrets) registered. These credentials are prime targets for attackers. Regularly audit this list to identify unused or over-permissioned applications.

Step-by-step guide:

1. Install the AzureAD module: `Install-Module AzureAD`

2. Connect to your tenant: `Connect-AzureAD`

  1. Run the command to export a list of all apps with credentials: `Get-AzureADServicePrincipal | Where-Object {$.KeyCredentials -ne $null} | Select-Object DisplayName, AppId, KeyCredentials | Export-Csv -Path “AppAudit.csv” -NoTypeInformation`
    4. Investigate each application to ensure it is authorized and that its permissions are aligned with the principle of least privilege.

2. Hunt for Microsoft 365 Mailbox Delegation Rules

`Get-MailboxPermission -Identity [email address] | Where-Object {$.User -notlike “NT AUTHORITY\SELF” -and $.IsInherited -eq $false}`
Mailbox delegation rules, especially “FullAccess” permissions, are a common method for attackers to persist within an environment and exfiltrate data. This Exchange Online PowerShell command reveals all non-inherited permissions on a specific mailbox, highlighting potentially malicious grants.

Step-by-step guide:

1. Connect to Exchange Online PowerShell: `Connect-ExchangeOnline`

  1. Run the command for a user’s mailbox: `Get-MailboxPermission -Identity “[email protected]” | Where-Object {$.User -notlike “NT AUTHORITY\SELF” -and $.IsInherited -eq $false} | Format-List`
    3. Pay close attention to permissions granted to unrecognized user accounts or application principals. Investigate and remove any suspicious delegations immediately.

  2. Enable Microsoft Defender Attack Surface Reduction (ASR) Rules

`Set-MpPreference -AttackSurfaceReductionRules_Ids [bash] -AttackSurfaceReductionRules_Actions Enabled`

ASR rules are a powerful feature of Microsoft Defender for Endpoint to block common malware infection techniques. This PowerShell command, run on a endpoint or via Intune, enables a specific ASR rule by its GUID.

Step-by-step guide:

  1. Identify the ASR rule you want to enable, e.g., “Block executable content from email client and webmail” (GUID: BE9BA2D9-53EA-4CDC-84E5-9B1EEEE46550).
  2. Run the following command from an elevated PowerShell prompt: `Set-MpPreference -AttackSurfaceReductionRules_Ids BE9BA2D9-53EA-4CDC-84E5-9B1EEEE46550 -AttackSurfaceReductionRules_Actions Enabled`
    3. To enable in audit mode first (recommended), replace `Enabled` with AuditMode. Monitor the Microsoft Defender Security Center for triggered events before enforcing.

  3. Scan for Azure Storage Blobs with Anonymous Public Read Access

`Get-AzStorageAccount | Get-AzStorageContainer | Where-Object {$.PublicAccess -ne “Off”}`

Misconfigured Azure Storage Accounts with anonymous public access are a leading cause of cloud data breaches. This Azure PowerShell command scans all storage containers in your subscription and lists those that are not set to “Off” (Private).

Step-by-step guide:

1. Install the Az.Storage module: `Install-Module -Name Az.Storage`

2. Connect to your Azure subscription: `Connect-AzAccount`

  1. Run the scan: `Get-AzStorageAccount | Get-AzStorageContainer | Where-Object {$.PublicAccess -ne “Off”} | Select-Object BlobEndpoint, Name, PublicAccess`
    4. For any containers listed, navigate to the Azure Portal, select the storage account, then the container, and change the “Public access level” to “Private (no anonymous access)”.

  2. Query Cloud App Security for Anomalous File Downloads
    `Investigation -| where ActionType == “FileDownloaded” and RawEventData.VolumeBytes > 1000000000 | project Timestamp, IPAddress, UserAgent, UserId, RawEventData.VolumeBytes`
    Massive file downloads can indicate data exfiltration. This query for Microsoft Defender for Cloud Apps (now part of Defender XDR) hunts for download events exceeding 1 GB, a significant anomaly for most users.

Step-by-step guide:

1. Navigate to the Microsoft Defender portal (security.microsoft.com).

2. Go to Hunting > Advanced hunting.

  1. Paste the above KQL (Kusto Query Language) query into the query window.

  2. Click “Run query”. Review the results for unusual activity from user accounts, particularly outside of normal working hours or from unfamiliar IP addresses.

  3. Force Re-register and Validate Azure AD Hybrid Join Status

`dsregcmd /status`

Hybrid Azure AD Join is fundamental for device identity and conditional access policies. Misjoined devices can create security gaps. This command-line tool provides a detailed breakdown of a Windows device’s registration state with Azure AD.

Step-by-step guide:

  1. On a domain-joined Windows 10/11 device, open an elevated Command Prompt.

2. Run the command: `dsregcmd /status`

  1. In the output, check the `AzureAdJoined` and `DomainJoined` fields. Both should read “YES”.
  2. Also check for “YES” under `DeviceAuth` to confirm the device has a valid PRT (Primary Refresh Token). If any values are “NO”, troubleshoot your hybrid join configuration.

  3. Deploy a Conditional Access Policy via PowerShell (Preview)
    `New-MgIdentityConditionalAccessPolicy -DisplayName “Require MFA for ALL Admins” -State “enabled” -Conditions…`
    While best managed in the portal, automating Conditional Access (CA) policy deployment via the Microsoft Graph PowerShell SDK allows for version control and rapid replication across tenants.

Step-by-step guide:

1. Install the Microsoft.Graph module: `Install-Module Microsoft.Graph`

  1. Connect with the required scope: `Connect-MgGraph -Scopes “Policy.ReadWrite.ConditionalAccess”, “Application.Read.All”`
    3. Use the `New-MgIdentityConditionalAccessPolicy` cmdlet with complex JSON parameters to define the policy conditions, grant controls (e.g., require MFA), and session controls. Due to the complexity, it is advised to first create a policy in the GUI and use the `Get-MgIdentityConditionalAccessPolicy` cmdlet to reverse-engineer the JSON structure.

What Undercode Say:

  • Identity is the new perimeter, and its configuration is your first and last line of defense. Manual, periodic checks are insufficient; automation and continuous monitoring are non-negotiable.
  • The cloud shared responsibility model means misconfigurations are the number one vulnerability. Proactive hardening using native tools is more effective than relying solely on third-party solutions.

Analysis: The provided LinkedIn post, while personal, underscores a critical security truth: the human element. The ability to “switch off” is vital, but it requires a securely configured environment that operates resiliently in the background. The commands outlined here are the building blocks of that resilient architecture. They shift the focus from reactive incident response to proactive security hardening, ensuring that when IT and security leaders do switch off, the organization’s digital assets remain protected by a robust, automated defense posture built on well-understood and properly configured native capabilities.

Prediction:

The convergence of AI-powered attack tooling and an expanding cloud attack surface will make manual security configuration a catastrophic liability. Future breaches will increasingly be attributed not to sophisticated zero-days, but to the exploitation of known misconfigurations in Entra ID, M365, and Azure that were simply never audited or remediated. Organizations that fail to automate the auditing and hardening processes detailed above will face exponentially greater risks, as attackers will use AI to scan and exploit these common weaknesses at a scale and speed previously impossible.

🎯Let’s Practice For Free:

IT/Security Reporter URL:

Reported By: Natehutchinson Was – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

🔐JOIN OUR CYBER WORLD [ CVE News • HackMonitor • UndercodeNews ]

💬 Whatsapp | 💬 Telegram

📢 Follow UndercodeTesting & Stay Tuned:

𝕏 formerly Twitter 🐦 | @ Threads | 🔗 Linkedin | 🦋BlueSky

Related Posts: