VIP Mailbox manipulation
Id | 5170c3c4-b8c9-485c-910d-a21d965ee181 |
Rulename | VIP Mailbox manipulation |
Description | Alert if a cmdlet that can be translated to data exfiltration or mailbox access is executed on a VIP Mailbox. |
Severity | Medium |
Tactics | Exfiltration Persistence Collection |
Techniques | T1020 T1098 T1114 |
Required data connectors | ESI-ExchangeAdminAuditLogEvents |
Kind | Scheduled |
Query frequency | 30m |
Query period | 1h |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Exchange Security - Exchange On-Premises/Analytic Rules/CriticalCmdletsUsageDetection.yaml |
Version | 1.2.0 |
Arm template | 5170c3c4-b8c9-485c-910d-a21d965ee181.json |
let VIPRestriction = "on";
ExchangeAdminAuditLogs
| where IsVIP or VIPRestriction =~ "off"
| where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)
| extend Level = iif (Status == "Failure", "Medium", "High")
queryPeriod: 1h
version: 1.2.0
tactics:
- Exfiltration
- Persistence
- Collection
queryFrequency: 30m
id: 5170c3c4-b8c9-485c-910d-a21d965ee181
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
- Event
connectorId: ESI-ExchangeAdminAuditLogEvents
severity: Medium
alertDetailsOverride:
alertDescriptionFormat: Alert from Microsoft Exchange Security as {{CmdletName}} with parameters {{CmdletParameters}} was executed on {{TargetObject}}
alertSeverityColumnName: Level
alertDisplayNameFormat: '{{CmdletName}} executed on {{TargetObject}}'
entityMappings:
- entityType: Mailbox
fieldMappings:
- columnName: TargetObject
identifier: MailboxPrimaryAddress
- entityType: Host
fieldMappings:
- columnName: Computer
identifier: FullName
- entityType: Account
fieldMappings:
- columnName: TargetObject
identifier: Sid
- columnName: TargetObject
identifier: ObjectGuid
- columnName: TargetObject
identifier: FullName
- entityType: Account
fieldMappings:
- columnName: Caller
identifier: Name
triggerThreshold: 0
relevantTechniques:
- T1020
- T1098
- T1114
query: |
let VIPRestriction = "on";
ExchangeAdminAuditLogs
| where IsVIP or VIPRestriction =~ "off"
| where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)
| extend Level = iif (Status == "Failure", "Medium", "High")
kind: Scheduled
name: VIP Mailbox manipulation
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Exchange Security - Exchange On-Premises/Analytic Rules/CriticalCmdletsUsageDetection.yaml
description: |
'Alert if a cmdlet that can be translated to data exfiltration or mailbox access is executed on a VIP Mailbox.'
status: Available
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/5170c3c4-b8c9-485c-910d-a21d965ee181')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/5170c3c4-b8c9-485c-910d-a21d965ee181')]",
"properties": {
"alertDetailsOverride": {
"alertDescriptionFormat": "Alert from Microsoft Exchange Security as {{CmdletName}} with parameters {{CmdletParameters}} was executed on {{TargetObject}}",
"alertDisplayNameFormat": "{{CmdletName}} executed on {{TargetObject}}",
"alertSeverityColumnName": "Level"
},
"alertRuleTemplateName": "5170c3c4-b8c9-485c-910d-a21d965ee181",
"customDetails": null,
"description": "'Alert if a cmdlet that can be translated to data exfiltration or mailbox access is executed on a VIP Mailbox.'\n",
"displayName": "VIP Mailbox manipulation",
"enabled": true,
"entityMappings": [
{
"entityType": "Mailbox",
"fieldMappings": [
{
"columnName": "TargetObject",
"identifier": "MailboxPrimaryAddress"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Computer",
"identifier": "FullName"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "TargetObject",
"identifier": "Sid"
},
{
"columnName": "TargetObject",
"identifier": "ObjectGuid"
},
{
"columnName": "TargetObject",
"identifier": "FullName"
}
]
},
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Caller",
"identifier": "Name"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Exchange Security - Exchange On-Premises/Analytic Rules/CriticalCmdletsUsageDetection.yaml",
"query": "let VIPRestriction = \"on\";\nExchangeAdminAuditLogs\n| where IsVIP or VIPRestriction =~ \"off\"\n| where UserOriented =~ 'Yes' and IsSensitive and ((IsRestrictedCmdLet and IsSenstiveCmdletParameters) or IsRestrictedCmdLet == false)\n| extend Level = iif (Status == \"Failure\", \"Medium\", \"High\")\n",
"queryFrequency": "PT30M",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Collection",
"Exfiltration",
"Persistence"
],
"techniques": [
"T1020",
"T1098",
"T1114"
],
"templateVersion": "1.2.0",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}