This skill covers deploying Microsoft Sentinel as a cloud-native SIEM and SOAR platform for centralized security operations. It details configuring data connectors for multi-cloud log ingestion, writing KQL detection queries, building automated response playbooks with Logic Apps, and leveraging the Sentinel data lake for petabyte-scale threat hunting across AWS, Azure, and GCP security telemetry.
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This skill covers deploying Microsoft Sentinel as a cloud-native SIEM and SOAR platform for centralized security operations. It details configuring data connectors for multi-cloud log ingestion, writing KQL detection queries, building automated response playbooks with Logic Apps, and leveraging the Sentinel data lake for petabyte-scale threat hunting across AWS, Azure, and GCP security telemetry.
When establishing a centralized security operations center for multi-cloud environments
When migrating from legacy SIEM platforms (Splunk, QRadar) to cloud-native architecture
When building automated incident response workflows for cloud-specific threats
When performing large-scale threat hunting across petabytes of security telemetry
When integrating threat intelligence feeds with cloud security log analysis
Do not use for AWS-only environments where Security Hub and GuardDuty suffice, for endpoint detection requiring EDR capabilities (use Defender for Endpoint), or for compliance posture monitoring (see building-cloud-security-posture-management).
Prerequisites
Azure subscription with Microsoft Sentinel enabled on a Log Analytics workspace
Data connector permissions for target log sources (AWS CloudTrail, Azure Activity, GCP)
Logic Apps or Azure Functions for automated response playbooks
KQL (Kusto Query Language) proficiency for writing detection rules and hunting queries
Workflow
Step 1: Provision Sentinel Workspace and Data Connectors
Create a Log Analytics workspace optimized for security data and enable data connectors for multi-cloud ingestion.
Create analytics rules using Kusto Query Language to detect cloud-specific threats. Map each rule to MITRE ATT&CK techniques.
// Detect impossible travel - sign-ins from geographically distant locations
let timeframe = 1h;
let distance_threshold = 500; // km
SigninLogs
| where TimeGenerated > ago(timeframe)
| where ResultType == 0 // Successful sign-ins only
| project TimeGenerated, UserPrincipalName, IPAddress, Location,
Latitude = toreal(LocationDetails.geoCoordinates.latitude),
Longitude = toreal(LocationDetails.geoCoordinates.longitude)
| sort by UserPrincipalName asc, TimeGenerated asc
| extend PrevLatitude = prev(Latitude, 1), PrevLongitude = prev(Longitude, 1),
PrevTime = prev(TimeGenerated, 1), PrevUser = prev(UserPrincipalName, 1)
| where UserPrincipalName == PrevUser
| extend TimeDiff = datetime_diff('minute', TimeGenerated, PrevTime)
| where TimeDiff < 60
| extend Distance = geo_distance_2points(Longitude, Latitude, PrevLongitude, PrevLatitude) / 1000
| where Distance > distance_threshold
| project TimeGenerated, UserPrincipalName, IPAddress, Location, Distance, TimeDiff
// Detect AWS IAM credential abuse from CloudTrail
AWSCloudTrail
| where TimeGenerated > ago(24h)
| where EventName in ("ConsoleLogin", "AssumeRole", "GetSessionToken")
| where ErrorCode == ""
| summarize LoginCount = count(), DistinctIPs = dcount(SourceIpAddress),
IPList = make_set(SourceIpAddress, 10)
by UserIdentityArn, bin(TimeGenerated, 1h)
| where DistinctIPs > 3
| project TimeGenerated, UserIdentityArn, LoginCount, DistinctIPs, IPList
// Detect mass S3 object deletion (potential ransomware)
AWSCloudTrail
| where TimeGenerated > ago(1h)
| where EventName == "DeleteObject" or EventName == "DeleteObjects"
| summarize DeleteCount = count(), BucketsAffected = dcount(RequestParameters_bucketName)
by UserIdentityArn, bin(TimeGenerated, 10m)
| where DeleteCount > 100
| project TimeGenerated, UserIdentityArn, DeleteCount, BucketsAffected
Step 3: Build SOAR Playbooks with Logic Apps
Create automated response playbooks that execute when analytics rules trigger incidents. Common actions include blocking users, isolating resources, and enriching alerts with threat intelligence.
{"definition":{"triggers":{"Microsoft_Sentinel_incident":{"type":"ApiConnectionWebhook","inputs":{"body":{"incidentArmId":"subscriptions/@{triggerBody()?['workspaceInfo']?['SubscriptionId']}/resourceGroups/@{triggerBody()?['workspaceInfo']?['ResourceGroupName']}/providers/Microsoft.OperationalInsights/workspaces/@{triggerBody()?['workspaceInfo']?['WorkspaceName']}/providers/Microsoft.SecurityInsights/Incidents/@{triggerBody()?['object']?['properties']?['incidentNumber']}"},"host":{"connection":{"name":"@parameters('$connections')['microsoftsentinel']['connectionId']"}}}}},"actions":{"Get_incident_entities":{"type":"ApiConnection","inputs":{"method":"post","path":"/Incidents/entities"}},"For_each_account_entity":{"type":"Foreach","foreach":"@body('Get_incident_entities')?['Accounts']","actions":{"Disable_Azure_AD_user":{"type":"ApiConnection","inputs":{"method":"PATCH","path":"/v1.0/users/@{items('For_each_account_entity')?['AadUserId']}","body":{"accountEnabled":false}}},"Add_comment_to_incident":{"type":"ApiConnection","inputs":{"body":{"message":"User @{items('For_each_account_entity')?['Name']} disabled by automated playbook"}}}}}}}}
Step 4: Configure Sentinel Data Lake for Long-Term Hunting
Enable the Sentinel data lake for petabyte-scale log retention and advanced threat hunting using both KQL and SQL endpoints.
// Threat hunting query: detect lateral movement across AWS accounts
let suspicious_roles = AWSCloudTrail
| where TimeGenerated > ago(7d)
| where EventName == "AssumeRole"
| extend AssumedRoleArn = tostring(parse_json(RequestParameters).roleArn)
| where AssumedRoleArn contains "cross-account" or AssumedRoleArn contains "admin"
| summarize AssumeCount = count(), UniqueSourceAccounts = dcount(RecipientAccountId)
by UserIdentityArn, AssumedRoleArn
| where AssumeCount > 10 and UniqueSourceAccounts > 2;
suspicious_roles
| join kind=inner (
AWSCloudTrail
| where TimeGenerated > ago(7d)
| where EventName in ("RunInstances", "CreateFunction", "PutBucketPolicy")
) on UserIdentityArn
| project TimeGenerated, UserIdentityArn, AssumedRoleArn, EventName, SourceIpAddress
Step 5: Integrate Threat Intelligence
Connect threat intelligence providers and create indicator-based matching rules to detect communication with known malicious infrastructure.
Context: An attacker compromises an Azure AD account through phishing, then uses the account to access AWS resources via federated identity. Sentinel needs to correlate the Azure sign-in anomaly with unusual AWS API activity.
Approach:
Create an analytics rule detecting Azure AD impossible travel or anomalous sign-in risk
Write a KQL query correlating the compromised Azure AD identity with AWS CloudTrail AssumeRoleWithSAML events
Build a Fusion detection rule that links Azure AD risk events with subsequent AWS privilege escalation activity
Deploy a SOAR playbook that automatically disables the Azure AD account and revokes AWS STS sessions
Create a workbook showing the timeline from initial compromise through lateral movement to AWS
Run a hunting query across the data lake to check for similar patterns affecting other accounts
Pitfalls: Not correlating identity across cloud providers misses the full attack chain. Setting analytics rule frequency too low (e.g., 24 hours) allows attackers hours of undetected access.
Output Format
Microsoft Sentinel SOC Operations Report
==========================================
Workspace: sentinel-workspace
Data Sources: 14 connectors active
Report Period: 2025-02-01 to 2025-02-23
DATA INGESTION:
Azure AD Sign-in Logs: 2.3 TB (23 days)
AWS CloudTrail: 1.8 TB (23 days)
Azure Activity: 0.9 TB (23 days)
Defender for Cloud Alerts: 45 GB (23 days)
Total Ingestion: 5.1 TB
DETECTION SUMMARY:
Active Analytics Rules: 87
Incidents Created: 234
Critical: 8 | High: 34 | Medium: 89 | Low: 103
Mean Time to Detect (MTTD): 4.2 minutes
Mean Time to Respond (MTTR): 18 minutes
TOP INCIDENT TYPES:
Impossible Travel Detected: 42 incidents
AWS Unauthorized API Call Pattern: 28 incidents
Mass File Deletion in S3: 3 incidents
Suspicious Azure AD App Registration: 12 incidents
AUTOMATION:
Playbooks Executed: 156
Accounts Auto-Disabled: 23
Incidents Auto-Enriched: 198
False Positive Rate: 12%
