TI map Domain entity to Syslog
| Id | 532f62c1-fba6-4baa-bbb6-4a32a4ef32fa |
| Rulename | TI map Domain entity to Syslog |
| Description | Identifies a match in Syslog table from any Domain IOC from TI |
| Severity | Medium |
| Tactics | Impact |
| Required data connectors | Syslog 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/Analytic Rules/DomainEntity_Syslog.yaml |
| Version | 1.3.1 |
| Arm template | 532f62c1-fba6-4baa-bbb6-4a32a4ef32fa.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True);
//Create a list of TLDs in our threat feed for later validation
let list_tlds = ThreatIntelligenceIndicator
| where TimeGenerated > ago(ioc_lookBack)
| where isnotempty(DomainName)
| extend parts = split(DomainName, '.')
| extend tld = parts[(array_length(parts)-1)]
| summarize count() by tostring(tld)
| summarize make_list(tld);
let Domain_Indicators = (union isfuzzy=true
(ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(DomainName)
| extend TI_DomainEntity = DomainName
),
(IoCList
| where IoC_Type =~ 'domainname'
| where ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
| where Active =~ 'True'
| extend TI_DomainEntity = IoC
| project-away IoC_Type
)
);
Domain_Indicators
// 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 (
Syslog
| where TimeGenerated > ago(dt_lookBack)
//Extract domain patterns from syslog message
| extend domain = extract("(([a-z0-9]+(-[a-z0-9]+)*\\.)+[a-z]{2,})",1, tolower(SyslogMessage))
| where isnotempty(domain)
| extend parts = split(domain, '.')
//Split out the TLD
| extend tld = parts[(array_length(parts)-1)]
//Validate parsed domain by checking if the TLD is in the list of TLDs in our threat feed
| where tld in~ (list_tlds)
| extend Syslog_TimeGenerated = TimeGenerated
) on $left.TI_DomainEntity==$right.domain
| where Syslog_TimeGenerated < ExpirationDateTime
| summarize Syslog_TimeGenerated = arg_max(Syslog_TimeGenerated , *) by IndicatorId, domain, IoC
| project Syslog_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SyslogMessage, Computer, ProcessName, domain, HostIP, Url, Type, IoC, TI_DomainEntity
| extend timestamp = Syslog_TimeGenerated, HostCustomEntity = Computer, IPCustomEntity = HostIP, URLCustomEntity = Url
version: 1.3.1
queryFrequency: 1h
requiredDataConnectors:
- connectorId: Syslog
dataTypes:
- Syslog
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
entityMappings:
- fieldMappings:
- columnName: HostCustomEntity
identifier: FullName
entityType: Host
- fieldMappings:
- columnName: IPCustomEntity
identifier: Address
entityType: IP
- fieldMappings:
- columnName: URLCustomEntity
identifier: Url
entityType: URL
kind: Scheduled
queryPeriod: 14d
severity: Medium
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv"] with(format="csv", ignoreFirstRecord=True);
//Create a list of TLDs in our threat feed for later validation
let list_tlds = ThreatIntelligenceIndicator
| where TimeGenerated > ago(ioc_lookBack)
| where isnotempty(DomainName)
| extend parts = split(DomainName, '.')
| extend tld = parts[(array_length(parts)-1)]
| summarize count() by tostring(tld)
| summarize make_list(tld);
let Domain_Indicators = (union isfuzzy=true
(ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where Active == true
// Picking up only IOC's that contain the entities we want
| where isnotempty(DomainName)
| extend TI_DomainEntity = DomainName
),
(IoCList
| where IoC_Type =~ 'domainname'
| where ExpirationDateTime > now()
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC
| where Active =~ 'True'
| extend TI_DomainEntity = IoC
| project-away IoC_Type
)
);
Domain_Indicators
// 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 (
Syslog
| where TimeGenerated > ago(dt_lookBack)
//Extract domain patterns from syslog message
| extend domain = extract("(([a-z0-9]+(-[a-z0-9]+)*\\.)+[a-z]{2,})",1, tolower(SyslogMessage))
| where isnotempty(domain)
| extend parts = split(domain, '.')
//Split out the TLD
| extend tld = parts[(array_length(parts)-1)]
//Validate parsed domain by checking if the TLD is in the list of TLDs in our threat feed
| where tld in~ (list_tlds)
| extend Syslog_TimeGenerated = TimeGenerated
) on $left.TI_DomainEntity==$right.domain
| where Syslog_TimeGenerated < ExpirationDateTime
| summarize Syslog_TimeGenerated = arg_max(Syslog_TimeGenerated , *) by IndicatorId, domain, IoC
| project Syslog_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SyslogMessage, Computer, ProcessName, domain, HostIP, Url, Type, IoC, TI_DomainEntity
| extend timestamp = Syslog_TimeGenerated, HostCustomEntity = Computer, IPCustomEntity = HostIP, URLCustomEntity = Url
triggerOperator: gt
id: 532f62c1-fba6-4baa-bbb6-4a32a4ef32fa
description: |
'Identifies a match in Syslog table from any Domain IOC from TI'
triggerThreshold: 0
name: TI map Domain entity to Syslog
tactics:
- Impact
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_Syslog.yaml
{
"$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/532f62c1-fba6-4baa-bbb6-4a32a4ef32fa')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/532f62c1-fba6-4baa-bbb6-4a32a4ef32fa')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "TI map Domain entity to Syslog",
"description": "'Identifies a match in Syslog table from any Domain IOC from TI'\n",
"severity": "Medium",
"enabled": true,
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet IoCList = externaldata(TimeGenerated:datetime,IoC:string,IoC_Type:string,ExpirationDateTime:datetime,Description:string,Action:string, ConfidenceScore:real, ThreatType:string, Active:string,Type:string, TrafficLightProtocolLevel:string, ActivityGroupNames:string)[@\"https://raw.githubusercontent.com/microsoft/mstic/master/RapidReleaseTI/Indicators.csv\"] with(format=\"csv\", ignoreFirstRecord=True);\n//Create a list of TLDs in our threat feed for later validation\nlet list_tlds = ThreatIntelligenceIndicator\n| where TimeGenerated > ago(ioc_lookBack)\n| where isnotempty(DomainName)\n| extend parts = split(DomainName, '.')\n| extend tld = parts[(array_length(parts)-1)]\n| summarize count() by tostring(tld)\n| summarize make_list(tld);\nlet Domain_Indicators = (union isfuzzy=true\n(ThreatIntelligenceIndicator\n| where TimeGenerated >= ago(ioc_lookBack) and ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n| where Active == true\n// Picking up only IOC's that contain the entities we want\n| where isnotempty(DomainName)\n| extend TI_DomainEntity = DomainName\n),\n(IoCList\n| where IoC_Type =~ 'domainname'\n| where ExpirationDateTime > now()\n| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IoC\n| where Active =~ 'True'\n| extend TI_DomainEntity = IoC\n| project-away IoC_Type\n)\n);\nDomain_Indicators\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 (\nSyslog\n| where TimeGenerated > ago(dt_lookBack)\n//Extract domain patterns from syslog message\n| extend domain = extract(\"(([a-z0-9]+(-[a-z0-9]+)*\\\\.)+[a-z]{2,})\",1, tolower(SyslogMessage))\n| where isnotempty(domain)\n| extend parts = split(domain, '.')\n//Split out the TLD\n| extend tld = parts[(array_length(parts)-1)]\n//Validate parsed domain by checking if the TLD is in the list of TLDs in our threat feed\n| where tld in~ (list_tlds)\n| extend Syslog_TimeGenerated = TimeGenerated\n) on $left.TI_DomainEntity==$right.domain\n| where Syslog_TimeGenerated < ExpirationDateTime\n| summarize Syslog_TimeGenerated = arg_max(Syslog_TimeGenerated , *) by IndicatorId, domain, IoC\n| project Syslog_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, ExpirationDateTime, ConfidenceScore, SyslogMessage, Computer, ProcessName, domain, HostIP, Url, Type, IoC, TI_DomainEntity\n| extend timestamp = Syslog_TimeGenerated, HostCustomEntity = Computer, IPCustomEntity = HostIP, URLCustomEntity = Url\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"alertRuleTemplateName": "532f62c1-fba6-4baa-bbb6-4a32a4ef32fa",
"customDetails": null,
"entityMappings": [
{
"entityType": "Host",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "HostCustomEntity"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"identifier": "Address",
"columnName": "IPCustomEntity"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"identifier": "Url",
"columnName": "URLCustomEntity"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Threat Intelligence/Analytic Rules/DomainEntity_Syslog.yaml",
"templateVersion": "1.3.1"
}
}
]
}