TI map File Hash to Security Event
| Id | a7427ed7-04b4-4e3b-b323-08b981b9b4bf |
| Rulename | TI map File Hash to Security Event |
| Description | Identifies a match in Security Event data from any File Hash IOC from TI |
| Severity | Medium |
| Tactics | Impact |
| Required data connectors | MicrosoftDefenderThreatIntelligence SecurityEvents ThreatIntelligence ThreatIntelligenceTaxii WindowsForwardedEvents WindowsSecurityEvents |
| Kind | Scheduled |
| Query frequency | 1h |
| Query period | 14d |
| Trigger threshold | 0 |
| Trigger operator | gt |
| Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/FileHashEntity_SecurityEvent.yaml |
| Version | 1.4.5 |
| Arm template | a7427ed7-04b4-4e3b-b323-08b981b9b4bf.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where isnotempty(FileHashValue)
| where TimeGenerated >= ago(ioc_lookBack)
| extend FileHashValue = toupper(FileHashValue)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique ( union isfuzzy=true
(SecurityEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| where isnotempty(FileHash)
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(FileHash)
),
(WindowsEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| where isnotempty(EventData.FileHash)
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)
)
)
on $left.FileHashValue == $right.FileHash
| where SecurityEvent_TimeGenerated < ExpirationDateTime
| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash
| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
Process, FileHash, Computer, Account, Event, FileHashValue, FileHashType
| extend NTDomain = tostring(split(Account, '\\', 0)[0]), Name = tostring(split(Account, '\\', 1)[0])
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
| extend timestamp = SecurityEvent_TimeGenerated
name: TI map File Hash to Security Event
entityMappings:
- entityType: Account
fieldMappings:
- columnName: Account
identifier: FullName
- columnName: Name
identifier: Name
- columnName: NTDomain
identifier: NTDomain
- entityType: Host
fieldMappings:
- columnName: Computer
identifier: FullName
- columnName: HostName
identifier: HostName
- columnName: DnsDomain
identifier: DnsDomain
- entityType: URL
fieldMappings:
- columnName: Url
identifier: Url
- entityType: FileHash
fieldMappings:
- columnName: FileHashValue
identifier: Value
- columnName: FileHashType
identifier: Algorithm
id: a7427ed7-04b4-4e3b-b323-08b981b9b4bf
triggerThreshold: 0
severity: Medium
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/FileHashEntity_SecurityEvent.yaml
queryPeriod: 14d
queryFrequency: 1h
version: 1.4.5
triggerOperator: gt
description: |
'Identifies a match in Security Event data from any File Hash IOC from TI'
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelligenceIndicator
| where isnotempty(FileHashValue)
| where TimeGenerated >= ago(ioc_lookBack)
| extend FileHashValue = toupper(FileHashValue)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true and ExpirationDateTime > now()
// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated
| join kind=innerunique ( union isfuzzy=true
(SecurityEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| where isnotempty(FileHash)
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(FileHash)
),
(WindowsEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| where isnotempty(EventData.FileHash)
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)
)
)
on $left.FileHashValue == $right.FileHash
| where SecurityEvent_TimeGenerated < ExpirationDateTime
| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash
| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
Process, FileHash, Computer, Account, Event, FileHashValue, FileHashType
| extend NTDomain = tostring(split(Account, '\\', 0)[0]), Name = tostring(split(Account, '\\', 1)[0])
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
| extend timestamp = SecurityEvent_TimeGenerated
requiredDataConnectors:
- dataTypes:
- SecurityEvent
connectorId: SecurityEvents
- dataTypes:
- SecurityEvents
connectorId: WindowsSecurityEvents
- dataTypes:
- WindowsEvent
connectorId: WindowsForwardedEvents
- dataTypes:
- ThreatIntelligenceIndicator
connectorId: ThreatIntelligence
- dataTypes:
- ThreatIntelligenceIndicator
connectorId: ThreatIntelligenceTaxii
- dataTypes:
- ThreatIntelligenceIndicator
connectorId: MicrosoftDefenderThreatIntelligence
kind: Scheduled
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a7427ed7-04b4-4e3b-b323-08b981b9b4bf')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a7427ed7-04b4-4e3b-b323-08b981b9b4bf')]",
"properties": {
"alertRuleTemplateName": "a7427ed7-04b4-4e3b-b323-08b981b9b4bf",
"customDetails": null,
"description": "'Identifies a match in Security Event data from any File Hash IOC from TI'\n",
"displayName": "TI map File Hash to Security Event",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Account",
"identifier": "FullName"
},
{
"columnName": "Name",
"identifier": "Name"
},
{
"columnName": "NTDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "Computer",
"identifier": "FullName"
},
{
"columnName": "HostName",
"identifier": "HostName"
},
{
"columnName": "DnsDomain",
"identifier": "DnsDomain"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "Url",
"identifier": "Url"
}
]
},
{
"entityType": "FileHash",
"fieldMappings": [
{
"columnName": "FileHashValue",
"identifier": "Value"
},
{
"columnName": "FileHashType",
"identifier": "Algorithm"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/FileHashEntity_SecurityEvent.yaml",
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelligenceIndicator\n| where isnotempty(FileHashValue)\n| where TimeGenerated >= ago(ioc_lookBack)\n| extend FileHashValue = toupper(FileHashValue)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true and ExpirationDateTime > now()\n// using innerunique to keep perf fast and result set low, we only need one match to indicate potential malicious activity that needs to be investigated\n| join kind=innerunique ( union isfuzzy=true\n (SecurityEvent | where TimeGenerated >= ago(dt_lookBack)\n | where EventID in (\"8003\",\"8002\",\"8005\")\n | where isnotempty(FileHash)\n | extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(FileHash)\n ),\n (WindowsEvent | where TimeGenerated >= ago(dt_lookBack)\n | where EventID in (\"8003\",\"8002\",\"8005\")\n | where isnotempty(EventData.FileHash)\n | extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)\n )\n)\non $left.FileHashValue == $right.FileHash\n| where SecurityEvent_TimeGenerated < ExpirationDateTime\n| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash\n| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\nProcess, FileHash, Computer, Account, Event, FileHashValue, FileHashType\n| extend NTDomain = tostring(split(Account, '\\\\', 0)[0]), Name = tostring(split(Account, '\\\\', 1)[0])\n| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.')) \n| extend timestamp = SecurityEvent_TimeGenerated\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"templateVersion": "1.4.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}