Restrict-MDATPFileHash (#653)
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{
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"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
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"contentVersion": "1.0.0.0",
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"metadata": {
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"comments": "This playbook will take FileHash entities and generate alert and block threat indicators for each file hash in MDATP for 90 days.",
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"author": "Nicholas DiCola"
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},
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"parameters": {
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"PlaybookName": {
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"defaultValue": "Restrict-MDATPFileHash",
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"type": "String"
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},
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"UserName": {
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"defaultValue": "<username>@<domain>",
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"type": "string"
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}
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},
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"variables": {
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"AzureSentinelConnectionName": "[concat('azuresentinel-', parameters('PlaybookName'))]"
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},
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"resources": [
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{
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"type": "Microsoft.Web/connections",
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"apiVersion": "2016-06-01",
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"name": "[variables('AzureSentinelConnectionName')]",
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"location": "[resourceGroup().location]",
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"properties": {
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"displayName": "[parameters('UserName')]",
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"customParameterValues": {
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},
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"api": {
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"id": "[concat('/subscriptions/', subscription().subscriptionId, '/providers/Microsoft.Web/locations/', resourceGroup().location, '/managedApis/azuresentinel')]"
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}
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}
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},
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{
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"type": "Microsoft.Logic/workflows",
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"apiVersion": "2017-07-01",
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"name": "[parameters('PlaybookName')]",
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"location": "[resourceGroup().location]",
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"tags": {
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"LogicAppsCategory": "security"
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},
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"dependsOn": [
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"[resourceId('Microsoft.Web/connections', variables('AzureSentinelConnectionName'))]"
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],
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"identity": {
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"type": "SystemAssigned"
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},
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"properties": {
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"state": "Enabled",
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"definition": {
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"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
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"actions": {
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"Alert_-_Get_incident": {
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"inputs": {
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"host": {
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"connection": {
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"name": "@parameters('$connections')['azuresentinel']['connectionId']"
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}
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},
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"method": "get",
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"path": "/Cases/@{encodeURIComponent(triggerBody()?['SystemAlertId'])}/@{encodeURIComponent(triggerBody()?['WorkspaceSubscriptionId'])}/@{encodeURIComponent(triggerBody()?['WorkspaceId'])}/@{encodeURIComponent(triggerBody()?['WorkspaceResourceGroup'])}"
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},
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"runAfter": {
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},
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"type": "ApiConnection"
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},
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"For_each": {
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"actions": {
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"Condition": {
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"actions": {
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"Switch": {
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"cases": {
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"Case": {
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"actions": {
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"HTTP": {
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"inputs": {
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"authentication": {
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"audience": "https://api.securitycenter.windows.com/",
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"type": "ManagedServiceIdentity"
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},
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"body": {
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"action": "AlertAndBlock",
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"application": "@{triggerBody()?['ProductName']}",
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"description": "@{body('Alert_-_Get_incident')?['properties']?['Title']}",
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"expirationTime": "@{addDays(triggerBody()?['TimeGenerated'], 90)}",
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"indicatorType": "FileSha1",
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"indicatorValue": "@{items('For_each')?['Value']}",
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"severity": "@{body('Alert_-_Get_incident')?['properties']?['Severity']}",
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"title": "@{guid()}"
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},
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"method": "POST",
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"uri": "https://api.securitycenter.windows.com/api/indicators"
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},
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"runAfter": {
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},
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"type": "Http"
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}
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},
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"case": "SHA1"
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},
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"Case_2": {
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"actions": {
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"HTTP_2": {
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"inputs": {
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"authentication": {
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"audience": "https://api.securitycenter.windows.com/",
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"type": "ManagedServiceIdentity"
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},
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"body": {
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"action": "AlertAndBlock",
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"application": "@{triggerBody()?['ProductName']}",
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"description": "@{body('Alert_-_Get_incident')?['properties']?['Title']}",
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"expirationTime": "@{addDays(triggerBody()?['TimeGenerated'], 90)}",
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"indicatorType": "FileSha256",
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"indicatorValue": "@{items('For_each')?['Value']}",
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"severity": "@{body('Alert_-_Get_incident')?['properties']?['Severity']}",
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"title": "@{guid()}"
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},
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"method": "POST",
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"uri": "https://api.securitycenter.windows.com/api/indicators"
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},
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"runAfter": {
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},
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"type": "Http"
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}
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},
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"case": "SHA256"
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}
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},
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"default": {
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"actions": {
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}
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},
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"expression": "@items('For_each')?['Algorithm']",
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"runAfter": {
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},
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"type": "Switch"
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}
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},
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"expression": {
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"and": [
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{
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"equals": [
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"@items('For_each')['Type']",
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"filehash"
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]
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}
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]
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},
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"runAfter": {
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},
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"type": "If"
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}
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},
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"foreach": "@body('Parse_JSON')",
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"runAfter": {
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"Parse_JSON": [
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"Succeeded"
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]
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},
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"type": "Foreach"
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},
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"Parse_JSON": {
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"inputs": {
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"content": "@triggerBody()?['Entities']",
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"schema": {
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"items": {
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"properties": {
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"$id": {
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"type": "string"
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},
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"AadUserId": {
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"type": "string"
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},
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"Account": {
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"properties": {
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"$ref": {
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"type": "string"
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}
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},
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"type": "object"
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},
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"Address": {
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"type": "string"
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},
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"Algorithm": {
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"type": "string"
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},
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"CommandLine": {
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"type": "string"
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},
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"CreatedTimeUtc": {
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"type": "string"
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},
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"CreationTimeUtc": {
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"type": "string"
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},
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"Directory": {
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"type": "string"
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},
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"DnsDomain": {
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"type": "string"
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},
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"ElevationToken": {
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"type": "string"
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},
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"FileHashes": {
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"items": {
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"properties": {
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"$ref": {
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"type": "string"
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}
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},
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"required": [
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"$ref"
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],
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"type": "object"
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},
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"type": "array"
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},
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"Host": {
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"properties": {
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"$ref": {
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"type": "string"
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}
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},
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"type": "object"
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},
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"HostName": {
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"type": "string"
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},
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"ImageFile": {
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"properties": {
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"$ref": {
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"type": "string"
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}
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},
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"type": "object"
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},
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"IsDomainJoined": {
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"type": "boolean"
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},
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"IsDownloaded": {
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"type": "boolean"
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},
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"IsPe": {
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"type": "boolean"
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},
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"IsValid": {
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"type": "boolean"
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},
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"LastAccessTimeUtc": {
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"type": "string"
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},
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"LastWriteTimeUtc": {
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"type": "string"
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},
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"MachineId": {
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"type": "string"
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},
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"MachineIdType": {
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"type": "integer"
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},
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"NTDomain": {
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"type": "string"
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},
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"Name": {
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"type": "string"
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},
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"ParentProcess": {
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"properties": {
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"$ref": {
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"type": "string"
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}
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},
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"type": "object"
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},
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"ProcessId": {
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"type": "string"
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},
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"Sid": {
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"type": "string"
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},
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"SizeInBytes": {
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"type": "integer"
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},
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"Type": {
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"type": "string"
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},
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"UPNSuffix": {
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"type": "string"
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},
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"Url": {
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"type": "string"
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},
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"Value": {
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"type": "string"
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}
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},
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"required": [
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"$id",
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"Type"
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],
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"type": "object"
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},
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"type": "array"
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}
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},
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"runAfter": {
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"Alert_-_Get_incident": [
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"Succeeded"
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]
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},
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"type": "ParseJson"
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}
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},
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"contentVersion": "1.0.0.0",
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"outputs": {
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},
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"parameters": {
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"$connections": {
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"defaultValue": {
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},
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"type": "Object"
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}
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},
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"triggers": {
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"When_a_response_to_an_Azure_Sentinel_alert_is_triggered": {
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"inputs": {
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"body": {
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"callback_url": "@{listCallbackUrl()}"
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},
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"host": {
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"connection": {
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"name": "@parameters('$connections')['azuresentinel']['connectionId']"
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}
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},
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"path": "/subscribe"
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},
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"type": "ApiConnectionWebhook"
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}
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}
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},
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"parameters": {
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"$connections": {
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"value": {
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"azuresentinel": {
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"connectionId": "[resourceId('Microsoft.Web/connections', variables('AzureSentinelConnectionName'))]",
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"connectionName": "[variables('AzureSentinelConnectionName')]",
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"id": "[concat('/subscriptions/', subscription().subscriptionId, '/providers/Microsoft.Web/locations/', resourceGroup().location, '/managedApis/azuresentinel')]"
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}
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}
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}
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}
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}
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}
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]
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}
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@ -0,0 +1,25 @@
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# Restrict-MDATPFileHash
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author: Nicholas DiCola
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This playbook will take FileHash entities and generate alert and block threat indicators for each file hash in MDATP for 90 days.
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<a href="https://portal.azure.com/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2FAzure-Sentinel%2Fmaster%2FPlaybooks%2FRestrict-MDATPFileHash%2Fazuredeploy.json" target="_blank">
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<img src="http://azuredeploy.net/deploybutton.png"/>
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</a>
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<a href="https://portal.azure.us/#create/Microsoft.Template/uri/https%3A%2F%2Fraw.githubusercontent.com%2FAzure%2FAzure-Sentinel%2Fmaster%2FPlaybooks%2FRestrict-MDATPFileHash%2Fazuredeploy.json" target="_blank">
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<img src="https://raw.githubusercontent.com/Azure/azure-quickstart-templates/master/1-CONTRIBUTION-GUIDE/images/deploytoazuregov.png"/>
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</a>
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**Additional Post Install Notes:**
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The Logic App creates and uses a Managed System Identity (MSI) to authenticate and authorize against api.securitycenter.windows.com to update threat indicators.
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The MSI must be assigned API Permissions 'Ti.ReadWrite' to WindowsDefenderATP App. To assign use PowerShell and AzureAD Module. Run the following commands:
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$msi = Get-AzureADServicePrincipal | ?{$_.DisplayName -ieq "Restrict-MDATPUrl"}
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$graph = Get-AzureADServicePrincipal -Filter "AppId eq 'fc780465-2017-40d4-a0c5-307022471b92'"
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$roles = $graph.AppRoles | ?{$_.Value -imatch "Ti.ReadWrite" }
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Foreach ($role in $roles){
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New-AzureADServiceAppRoleAssignment -ObjectId $msi.ObjectId -PrincipalId $msi.ObjectId -Id $role.Id -ResourceId $graph.ObjectId
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}
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