TI map File Hash to DeviceFileEvents Event
| Id | d6f04915-4471-4cb3-b163-a8b72997cf72 |
| Rulename | TI map File Hash to DeviceFileEvents Event |
| Description | Identifies a match in DeviceFileEvents Event data from any FileHash IOC from TI |
| Severity | Medium |
| Tactics | CommandAndControl |
| Techniques | T1071 |
| Required data connectors | MicrosoftDefenderThreatIntelligence MicrosoftThreatProtection ThreatIntelligence ThreatIntelligenceTaxii |
| 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_DeviceFileEvents_Updated.yaml |
| Version | 1.0.2 |
| Arm template | d6f04915-4471-4cb3-b163-a8b72997cf72.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceFileEvents_ = (union
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));
let Hashes = DeviceFileEvents_ | distinct FileHashValue;
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 = ObservableValue
| extend IndicatorId = tostring(split(Id, "--")[2])
| where isnotempty(FileHashValue)
| where TimeGenerated > ago(ioc_lookBack)
// | where FileHashValue in (Hashes)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| extend Description = tostring(parse_json(Data).description)
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| project-reorder *, FileHashType, FileHashValue, Type
| join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue
| where TimeGenerated < ValidUntil
| summarize TimeGenerated = arg_max(TimeGenerated, *) by IndicatorId, DeviceId
| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, FileHashValue, FileHashType, ValidUntil, Confidence, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup
| extend timestamp = TimeGenerated
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
dataTypes:
- DeviceFileEvents
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
tactics:
- CommandAndControl
description: |
'Identifies a match in DeviceFileEvents Event data from any FileHash IOC from TI'
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let DeviceFileEvents_ = (union
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),
(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));
let Hashes = DeviceFileEvents_ | distinct FileHashValue;
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 = ObservableValue
| extend IndicatorId = tostring(split(Id, "--")[2])
| where isnotempty(FileHashValue)
| where TimeGenerated > ago(ioc_lookBack)
// | where FileHashValue in (Hashes)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue
| where IsActive and (ValidUntil > now() or isempty(ValidUntil))
| extend Description = tostring(parse_json(Data).description)
| where Description !contains_cs "State: inactive;" and Description !contains_cs "State: falsepos;"
| project-reorder *, FileHashType, FileHashValue, Type
| join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue
| where TimeGenerated < ValidUntil
| summarize TimeGenerated = arg_max(TimeGenerated, *) by IndicatorId, DeviceId
| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)
| extend Description = tostring(parse_json(Data).description)
| extend ActivityGroupNames = extract(@"ActivityGroup:(\S+)", 1, tostring(parse_json(Data).labels))
| project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, FileHashValue, FileHashType, ValidUntil, Confidence, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup
| extend timestamp = TimeGenerated
id: d6f04915-4471-4cb3-b163-a8b72997cf72
triggerOperator: gt
relevantTechniques:
- T1071
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/FileHashEntity_DeviceFileEvents_Updated.yaml
queryFrequency: 1h
severity: Medium
entityMappings:
- fieldMappings:
- columnName: RequestAccountName
identifier: Name
- columnName: RequestAccountSid
identifier: Sid
- columnName: RequestAccountDomain
identifier: NTDomain
entityType: Account
- fieldMappings:
- columnName: FileHashValue
identifier: Value
- columnName: FileHashType
identifier: Algorithm
entityType: FileHash
- fieldMappings:
- columnName: DeviceName
identifier: HostName
entityType: Host
name: TI map File Hash to DeviceFileEvents Event
queryPeriod: 14d
kind: Scheduled
triggerThreshold: 0
version: 1.0.2
{
"$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/d6f04915-4471-4cb3-b163-a8b72997cf72')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d6f04915-4471-4cb3-b163-a8b72997cf72')]",
"properties": {
"alertRuleTemplateName": "d6f04915-4471-4cb3-b163-a8b72997cf72",
"customDetails": null,
"description": "'Identifies a match in DeviceFileEvents Event data from any FileHash IOC from TI'\n",
"displayName": "TI map File Hash to DeviceFileEvents Event",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "RequestAccountName",
"identifier": "Name"
},
{
"columnName": "RequestAccountSid",
"identifier": "Sid"
},
{
"columnName": "RequestAccountDomain",
"identifier": "NTDomain"
}
]
},
{
"entityType": "FileHash",
"fieldMappings": [
{
"columnName": "FileHashValue",
"identifier": "Value"
},
{
"columnName": "FileHashType",
"identifier": "Algorithm"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DeviceName",
"identifier": "HostName"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence (NEW)/Analytic Rules/FileHashEntity_DeviceFileEvents_Updated.yaml",
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet DeviceFileEvents_ = (union\n(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA1) | extend FileHashValue = SHA1),\n(DeviceFileEvents | where TimeGenerated > ago(dt_lookBack) | where isnotempty(SHA256) | extend FileHashValue = SHA256));\nlet Hashes = DeviceFileEvents_ | distinct FileHashValue;\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 = ObservableValue\n | extend IndicatorId = tostring(split(Id, \"--\")[2])\n| where isnotempty(FileHashValue)\n| where TimeGenerated > ago(ioc_lookBack)\n// | where FileHashValue in (Hashes)\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id, ObservableValue\n| where IsActive and (ValidUntil > now() or isempty(ValidUntil))\n| extend Description = tostring(parse_json(Data).description)\n| where Description !contains_cs \"State: inactive;\" and Description !contains_cs \"State: falsepos;\"\n | project-reorder *, FileHashType, FileHashValue, Type\n| join kind=innerunique (DeviceFileEvents_) on $left.FileHashValue == $right.FileHashValue\n| where TimeGenerated < ValidUntil\n| summarize TimeGenerated = arg_max(TimeGenerated, *) by IndicatorId, DeviceId\n| extend TrafficLightProtocolLevel = tostring(parse_json(AdditionalFields).TLPLevel)\n| extend Description = tostring(parse_json(Data).description)\n| extend ActivityGroupNames = extract(@\"ActivityGroup:(\\S+)\", 1, tostring(parse_json(Data).labels))\n| project TimeGenerated, TrafficLightProtocolLevel, Description, ActivityGroupNames, IndicatorId, FileHashValue, FileHashType, ValidUntil, Confidence, ActionType, DeviceId, DeviceName, FolderPath, RequestAccountDomain, RequestAccountName, RequestAccountSid, MachineGroup\n| extend timestamp = TimeGenerated\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}