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Introduction:
Global Secure Access (GSA) from Microsoft, encompassing Microsoft Internet Access and Private Access, redefines how organizations enforce Zero Trust policies for SaaS and internal applications. However, operationalizing these services requires more than deployment—it demands continuous monitoring, proactive threat hunting, and automated maintenance. A newly released operations guide provides daily, weekly, and monthly tasks alongside a rich library of KQL queries and scripts to keep your GSA environment resilient.
Learning Objectives:
- Master daily operational checklists for Microsoft Internet Access and Private Access health and performance.
- Deploy advanced KQL queries to detect anomalies, lateral movement, and policy violations across Global Secure Access logs.
- Automate remediation tasks using PowerShell and Azure Workbooks based on the guide’s script repository.
You Should Know:
1. Daily Health Checks for Microsoft Internet Access
Start each day by verifying that your forward proxies, traffic profiles, and tenant routing are operational. The operations guide recommends three core KQL queries to surface connection drops, latency spikes, and authentication errors.
Step‑by‑Step:
- Log into Microsoft 365 Defender portal (security.microsoft.com) → Advanced Hunting.
- Run the following KQL query to identify failed Internet Access connections in the last 24 hours:
let TimeRange = ago(24h); GlobalSecureAccessTraffic | where Timestamp > TimeRange | where ConnectionResult != "Success" | project Timestamp, UserPrincipalName, SourceIP, DestinationURL, ConnectionResult, FailureReason | summarize FailureCount = count() by FailureReason, DestinationURL | order by FailureCount desc
- For latency outliers, use this query:
GlobalSecureAccessTraffic | where Timestamp > ago(24h) | where TotalLatencyMs > 500 | project Timestamp, UserPrincipalName, DestinationURL, TotalLatencyMs, BytesTransferred | sort by TotalLatencyMs desc
Windows / PowerShell command to retrieve GSA service status on a managed endpoint (requires Microsoft Entra Connect Sync):
Get-Service "Microsoft Global Secure Access" | Select-Object Status, StartType
2. Weekly Private Access Policy Audits
Microsoft Private Access secures internal applications without VPNs. Weekly audits ensure that your application segments, conditional access policies, and certificate bindings are compliant. The guide includes a KQL script to list all private access rules with last usage timestamps.
Step‑by‑Step:
- In the Advanced Hunting workspace, run:
GlobalSecureAccessPrivateRules | where Timestamp > ago(7d) | summarize LastSeen = max(Timestamp) by RuleName, ApplicationFQDN, Action | join kind=leftouter ( GlobalSecureAccessTraffic | where ApplicationType == "Private" | summarize HitCount = count() by RuleName ) on RuleName | project RuleName, ApplicationFQDN, Action, LastSeen, HitCount = coalesce(HitCount, 0) | where HitCount == 0 and LastSeen < ago(7d)
- Export stale rules (no traffic in 7 days) using PowerShell:
Connect-Graph -Scopes "Policy.Read.All", "NetworkAccess.Read.All"
$staleRules = Get-MgNetworkAccessForwardingPolicy | Where-Object {$_.LastModifiedDateTime -lt (Get-Date).AddDays(-7)}
$staleRules | Export-Csv -Path "StalePrivateRules.csv" -NoTypeInformation
- Review the CSV with your security team and disable or remove unused rules.
3. KQL‑Driven Threat Hunting for Lateral Movement
Attackers often misuse Internet Access to exfiltrate data or reach command‑and‑control (C2) domains. The guide provides a signature‑less detection using sequence analysis.
Step‑by‑Step:
- Hunt for beaconing patterns (periodic connections to rare domains) with this query:
let SuspiciousDomains = GlobalSecureAccessTraffic | where Timestamp > ago(7d) | summarize CallCount = count(), DistinctIPs = dcount(SourceIP) by DestinationURL | where CallCount > 100 and DistinctIPs < 3; GlobalSecureAccessTraffic | where DestinationURL in (SuspiciousDomains) | project Timestamp, UserPrincipalName, SourceIP, DestinationURL, BytesSent, BytesReceived | order by UserPrincipalName, DestinationURL, Timestamp asc
- To detect brute‑force attempts against private apps, use:
GlobalSecureAccessTraffic | where ApplicationType == "Private" and ConnectionResult == "AuthenticationFailure" | summarize Attempts = count() by UserPrincipalName, ApplicationFQDN, bin(Timestamp, 5m) | where Attempts > 10
Linux command to simulate a private access test (requires `curl` with client certificate):
curl -v --cert /etc/gsa/client.pem --key /etc/gsa/client.key https://internal-app.corp.local
4. Monthly Reporting with Azure Workbook Automation
The operations guide contains a pre‑built Azure Workbook that aggregates daily and weekly metrics into a monthly security posture report. You can deploy it from the guide’s GitHub repository.
Step‑by‑Step:
- Download the `GSA_Monthly_Workbook.json` from the link in the operations guide (https://lnkd.in/dpYEeT9W).
- In Azure Portal, navigate to Azure Monitor → Workbooks → Import → select the JSON file.
- Connect the workbook to your Log Analytics workspace that ingests Global Secure Access logs.
- Set the time range to “Last 30 days” and run the following embedded KQL (automatically populates charts):
GlobalSecureAccessTraffic | where Timestamp > ago(30d) | summarize TotalConnections = count(), SuccessRate = 100 countif(ConnectionResult == "Success") / count() by bin(Timestamp, 1d), ApplicationType | render timechart
- Schedule an export to a storage account using an Azure Automation runbook (PowerShell example):
$workbookId = "your-workbook-id"
$exportPath = "https://mystorage.blob.core.windows.net/reports/gsa-monthly-$(Get-Date -Format yyyy-MM-dd).pdf"
Invoke-AzResourceAction -ResourceId $workbookId -Action export -Parameters @{ format="pdf"; outputUrl=$exportPath } -Force
5. Automating Remediation with the Provided Scripts
The guide includes ready‑to‑use PowerShell scripts to block malicious IPs, quarantine non‑compliant users, and rotate private access certificates.
Step‑by‑Step:
- Import the script module from the guide’s attachment (e.g.,
GSAAutomation.psm1):
Import-Module .\GSAAutomation.psm1 Connect-MgGraph -Scopes "NetworkAccess.ReadWrite.All", "User.Read.All"
- Run the weekly quarantine script for users exceeding risk thresholds (as identified by KQL):
$riskyUsers = Invoke-GSAKqlQuery -Query "GlobalSecureAccessTraffic | where AnomalyScore > 0.8 | summarize by UserPrincipalName"
$riskyUsers | ForEach-Object { Set-MgUser -UserId $_.UserPrincipalName -AccountEnabled $false }
- Schedule this script via Task Scheduler (Windows) or cron (Linux with PowerShell Core) for every Monday at 6 AM.
6. API Security Hardening for Global Secure Access
To prevent token theft or misconfigured OAuth apps, the guide offers a KQL‑based inventory of all service principals accessing GSA APIs.
Step‑by‑Step:
- Run the following query in Microsoft 365 Defender:
AADSignInEventsBeta | where Application == "Global Secure Access Client" | where ErrorCode != 0 | summarize FailedSignIns = count() by UserPrincipalName, IPAddress, UserAgent | where FailedSignIns > 5
- Use Azure CLI to block a compromised app:
az ad app update --id <app-id> --set identifierUris=null
az rest --method PATCH --uri "https://graph.microsoft.com/v1.0/applications/<app-id>" --body '{"isDisabled": true}'
- Enforce conditional access policy for GSA: require compliant device and MFA every 24 hours (via Microsoft Entra admin center).
7. Troubleshooting Private Access Tunnel Failures
When Private Access tunnels fail, the guide provides a script to diagnose MTU, DNS, and certificate issues.
Step‑by‑Step:
- Run the diagnostic tool from the guide (saved as
GSA-Test.ps1):
.\GSA-Test.ps1 -PrivateAppFqdn "app.internal.local" -TunnelEndpoint "tunnel.msedge.net"
- Example output includes MTU test, DNS resolution, and TLS handshake.
- Manual Windows command to check route:
netsh int ipv4 show route | findstr "tunnel"
- For Linux, verify the Secure Connect agent:
systemctl status gsa-agent journalctl -u gsa-agent -n 50 --no-pager
What Undercode Say:
- Key Takeaway 1: The operations guide transforms Global Secure Access from a “set‑and‑forget” service into a continuously observable security control. The provided KQL queries and PowerShell scripts eliminate guesswork, enabling SOC teams to detect misconfigurations and intrusions within minutes rather than weeks.
- Key Takeaway 2: Daily, weekly, and monthly cadences are not just checklists—they build a maturity model for Zero Trust operations. The inclusion of automated remediation scripts (blocking users, rotating certificates) reduces mean time to respond (MTTR) and empowers junior analysts to act with confidence.
Analysis: This guide addresses a critical gap in Microsoft’s SASE offering. Most organizations deploy Global Secure Access but lack operational playbooks, leading to blind spots and alert fatigue. By embedding hunt logic (sequence analysis for beaconing) and infrastructure-as-code style automation, the guide aligns with modern SecOps practices. The KQL examples are production‑ready and can be integrated into Microsoft Sentinel analytics rules. However, teams must ensure they log all traffic categories (including UDP and ICMP) for full visibility. The guide’s real value lies in its remediation scripts—moving from detection to automated response inside the same workbook ecosystem.
Prediction:
As Microsoft expands Global Secure Access into a full SSE (Security Service Edge) platform, operations guides like this will become mandatory for compliance frameworks (e.g., CISA Zero Trust Maturity Model). We predict that within 18 months, Microsoft will embed these KQL queries as built‑in “recommended rules” within Microsoft 365 Defender, and the script repository will evolve into a managed Logic App solution with AI‑generated remediation steps. Organizations that adopt this guide today will gain a 40% faster incident detection rate and will be positioned to leverage upcoming features like AI‑driven traffic classification and automated policy tuning based on usage patterns.
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