HAFNIUM Suspicious Exchange Request
Id | 23005e87-2d3a-482b-b03d-edbebd1ae151 |
Rulename | HAFNIUM Suspicious Exchange Request |
Description | This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by HAFNIUM actors. The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers. Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/ |
Severity | Medium |
Tactics | InitialAccess |
Techniques | T1190 |
Required data connectors | AzureMonitor(IIS) |
Kind | Scheduled |
Query frequency | 1d |
Query period | 14d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/W3CIISLog/HAFNIUMSuspiciousExchangeRequestPattern.yaml |
Version | 1.0.1 |
Arm template | 23005e87-2d3a-482b-b03d-edbebd1ae151.json |
let exchange_servers = (
W3CIISLog
| where TimeGenerated > ago(14d)
| where sSiteName =~ "Exchange Back End"
| summarize by Computer);
W3CIISLog
| where TimeGenerated > ago(1d)
| where Computer in (exchange_servers)
| where csUriQuery startswith "t="
| project-reorder TimeGenerated, Computer, csUriStem, csUriQuery, csUserName, csUserAgent, cIP
| extend timestamp = TimeGenerated, AccountCustomEntity = csUserName, HostCustomEntity = Computer, IPCustomEntity = cIP
triggerOperator: gt
id: 23005e87-2d3a-482b-b03d-edbebd1ae151
queryFrequency: 1d
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
- entityType: Host
fieldMappings:
- columnName: HostCustomEntity
identifier: FullName
- entityType: IP
fieldMappings:
- columnName: IPCustomEntity
identifier: Address
requiredDataConnectors:
- dataTypes:
- W3CIISLog
connectorId: AzureMonitor(IIS)
severity: Medium
metadata:
source:
kind: Community
categories:
domains:
- Security - Threat Intelligence
support:
tier: Community
author:
name: Pete Bryan
triggerThreshold: 0
kind: Scheduled
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/W3CIISLog/HAFNIUMSuspiciousExchangeRequestPattern.yaml
query: |
let exchange_servers = (
W3CIISLog
| where TimeGenerated > ago(14d)
| where sSiteName =~ "Exchange Back End"
| summarize by Computer);
W3CIISLog
| where TimeGenerated > ago(1d)
| where Computer in (exchange_servers)
| where csUriQuery startswith "t="
| project-reorder TimeGenerated, Computer, csUriStem, csUriQuery, csUserName, csUserAgent, cIP
| extend timestamp = TimeGenerated, AccountCustomEntity = csUserName, HostCustomEntity = Computer, IPCustomEntity = cIP
description: |
'This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by HAFNIUM actors.
The same query can be run on HTTPProxy logs from on-premise hosted Exchange servers.
Reference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'
name: HAFNIUM Suspicious Exchange Request
relevantTechniques:
- T1190
tactics:
- InitialAccess
version: 1.0.1
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/23005e87-2d3a-482b-b03d-edbebd1ae151')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/23005e87-2d3a-482b-b03d-edbebd1ae151')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "HAFNIUM Suspicious Exchange Request",
"description": "'This query looks for suspicious request patterns to Exchange servers that fit a pattern observed by HAFNIUM actors.\nThe same query can be run on HTTPProxy logs from on-premise hosted Exchange servers.\nReference: https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/'\n",
"severity": "Medium",
"enabled": true,
"query": "let exchange_servers = (\nW3CIISLog\n| where TimeGenerated > ago(14d)\n| where sSiteName =~ \"Exchange Back End\"\n| summarize by Computer);\nW3CIISLog\n| where TimeGenerated > ago(1d)\n| where Computer in (exchange_servers)\n| where csUriQuery startswith \"t=\"\n| project-reorder TimeGenerated, Computer, csUriStem, csUriQuery, csUserName, csUserAgent, cIP\n| extend timestamp = TimeGenerated, AccountCustomEntity = csUserName, HostCustomEntity = Computer, IPCustomEntity = cIP\n",
"queryFrequency": "P1D",
"queryPeriod": "P14D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1190"
],
"alertRuleTemplateName": "23005e87-2d3a-482b-b03d-edbebd1ae151",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "AccountCustomEntity"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
],
"entityType": "Host"
},
{
"fieldMappings": [
{
"identifier": "Address",
"columnName": "IPCustomEntity"
}
],
"entityType": "IP"
}
],
"templateVersion": "1.0.1",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/W3CIISLog/HAFNIUMSuspiciousExchangeRequestPattern.yaml"
}
}
]
}