TI map File Hash to Security Event
| Id | 9f7dc779-1e51-4925-ae4a-db1db933077f |
| 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 | CommandAndControl |
| Techniques | T1071 |
| 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 (NEW)/Analytic Rules/FileHashEntity_SecurityEvent.yaml |
| Version | 1.4.9 |
| Arm template | 9f7dc779-1e51-4925-ae4a-db1db933077f.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelIndicators
//extract key part of kv pair
| extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
| where IndicatorType == "file"
| extend FileHashType = replace("'", "", substring(ObservableKey, indexof(ObservableKey, "hashes.") + 7, strlen(ObservableKey) - indexof(ObservableKey, "hashes.") - 7))
| extend FileHashValue = toupper(ObservableValue)
| where TimeGenerated >= ago(ioc_lookBack)
| extend FileHashValue = toupper(FileHashValue)
| extend IndicatorId = tostring(split(Id, "--")[2])
| extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| project-reorder *, FileHashType, FileHashValue, Type
// 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")
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(FileHash)
),
(WindowsEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)
)
)
on $left.FileHashValue == $right.FileHash
| where SecurityEvent_TimeGenerated < ValidUntil
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash
| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence,
Process, FileHash, Computer, Account, Event, FileHashValue, FileHashType, Url
| 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
tactics:
- CommandAndControl
entityMappings:
- fieldMappings:
- identifier: FullName
columnName: Account
- identifier: Name
columnName: Name
- identifier: NTDomain
columnName: NTDomain
entityType: Account
- fieldMappings:
- identifier: FullName
columnName: Computer
- identifier: HostName
columnName: HostName
- identifier: DnsDomain
columnName: DnsDomain
entityType: Host
- fieldMappings:
- identifier: Url
columnName: Url
entityType: URL
- fieldMappings:
- identifier: Value
columnName: FileHashValue
- identifier: Algorithm
columnName: FileHashType
entityType: FileHash
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
ThreatIntelIndicators
//extract key part of kv pair
| extend IndicatorType = replace(@"\[|\]|\""", "", tostring(split(ObservableKey, ":", 0)))
| where IndicatorType == "file"
| extend FileHashType = replace("'", "", substring(ObservableKey, indexof(ObservableKey, "hashes.") + 7, strlen(ObservableKey) - indexof(ObservableKey, "hashes.") - 7))
| extend FileHashValue = toupper(ObservableValue)
| where TimeGenerated >= ago(ioc_lookBack)
| extend FileHashValue = toupper(FileHashValue)
| extend IndicatorId = tostring(split(Id, "--")[2])
| extend Url = iff(ObservableKey == "url:value", ObservableValue, "")
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| project-reorder *, FileHashType, FileHashValue, Type
// 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")
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(FileHash)
),
(WindowsEvent | where TimeGenerated >= ago(dt_lookBack)
| where EventID in ("8003","8002","8005")
| extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)
)
)
on $left.FileHashValue == $right.FileHash
| where SecurityEvent_TimeGenerated < ValidUntil
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash
| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence,
Process, FileHash, Computer, Account, Event, FileHashValue, FileHashType, Url
| extend NTDomain = tostring(split(Account, '\\', 0)[0]), Name = tostring(split(Account, '\\', 1)[0])
| extend HostName = tostring(split(Computer, '.', 0)[0]), DnsDomain = tostring(strcat_array(array_slice(split(Computer, '.'), 1, -1), '.'))
| extend timestamp = SecurityEvent_TimeGenerated
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvents
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelIndicators
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelIndicators
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelIndicators
version: 1.4.9
queryFrequency: 1h
queryPeriod: 14d
description: |
'Identifies a match in Security Event data from any File Hash IOC from TI'
id: 9f7dc779-1e51-4925-ae4a-db1db933077f
triggerThreshold: 0
severity: Medium
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/FileHashEntity_SecurityEvent.yaml
name: TI map File Hash to Security Event
relevantTechniques:
- T1071
triggerOperator: gt
{
"$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/9f7dc779-1e51-4925-ae4a-db1db933077f')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9f7dc779-1e51-4925-ae4a-db1db933077f')]",
"properties": {
"alertRuleTemplateName": "9f7dc779-1e51-4925-ae4a-db1db933077f",
"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 (NEW)/Analytic Rules/FileHashEntity_SecurityEvent.yaml",
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nThreatIntelIndicators\n//extract key part of kv pair\n | extend IndicatorType = replace(@\"\\[|\\]|\\\"\"\", \"\", tostring(split(ObservableKey, \":\", 0)))\n | where IndicatorType == \"file\"\n | extend FileHashType = replace(\"'\", \"\", substring(ObservableKey, indexof(ObservableKey, \"hashes.\") + 7, strlen(ObservableKey) - indexof(ObservableKey, \"hashes.\") - 7))\n | extend FileHashValue = toupper(ObservableValue)\n| where TimeGenerated >= ago(ioc_lookBack)\n| extend FileHashValue = toupper(FileHashValue)\n| extend IndicatorId = tostring(split(Id, \"--\")[2])\n| extend Url = iff(ObservableKey == \"url:value\", ObservableValue, \"\")\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue\n| where IsActive and (ValidUntil > now() or isempty(ValidUntil))\n | project-reorder *, FileHashType, FileHashValue, Type\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 | 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 | extend SecurityEvent_TimeGenerated = TimeGenerated, Event = EventID, FileHash = toupper(EventData.FileHash)\n )\n)\non $left.FileHashValue == $right.FileHash\n| where SecurityEvent_TimeGenerated < ValidUntil\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| summarize SecurityEvent_TimeGenerated = arg_max(SecurityEvent_TimeGenerated, *) by IndicatorId, FileHash\n| project SecurityEvent_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ValidUntil, Confidence,\nProcess, FileHash, Computer, Account, Event, FileHashValue, FileHashType, Url\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",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.4.9",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}