ThreatConnect TI map Email entity to SigninLogs
Id | ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f |
Rulename | ThreatConnect TI map Email entity to SigninLogs |
Description | Identifies a match in SigninLogs table from any Email IOC from ThreatConnect TI |
Severity | Medium |
Tactics | CommandAndControl |
Techniques | T1071 |
Required data connectors | AzureActiveDirectory MicrosoftDefenderThreatIntelligence 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/ThreatConnect/Analytic Rules/ThreatConnect_EmailEntity_SigninLogs.yaml |
Version | 1.2.5 |
Arm template | ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f.json |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
let aadFunc = (tableName:string){
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where ExpirationDateTime > now() and Active == true
// Filter out non ThreatConnect TI Sources
| where SourceSystem startswith "ThreatConnect-"
//Filtering the table for Email related IOCs
| where isnotempty(EmailSenderAddress)
// 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 (
table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)
//Normalizing the column to lower case for exact match with EmailSenderAddress column
| extend UserPrincipalName = tolower(UserPrincipalName)
| where UserPrincipalName matches regex emailregex
| extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)
| extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
| extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
// renaming timestamp column so it is clear the log this came from SigninLogs table
| extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type
)
on $left.EmailSenderAddress == $right.UserPrincipalName
| where SigninLogs_TimeGenerated < ExpirationDateTime
| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,
StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
| extend timestamp = SigninLogs_TimeGenerated
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
kind: Scheduled
relevantTechniques:
- T1071
description: |
'Identifies a match in SigninLogs table from any Email IOC from ThreatConnect TI'
queryPeriod: 14d
queryFrequency: 1h
tactics:
- CommandAndControl
name: ThreatConnect TI map Email entity to SigninLogs
requiredDataConnectors:
- connectorId: ThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: ThreatIntelligenceTaxii
dataTypes:
- ThreatIntelligenceIndicator
- connectorId: AzureActiveDirectory
dataTypes:
- SigninLogs
- connectorId: AzureActiveDirectory
dataTypes:
- AADNonInteractiveUserSignInLogs
- connectorId: MicrosoftDefenderThreatIntelligence
dataTypes:
- ThreatIntelligenceIndicator
entityMappings:
- entityType: Account
fieldMappings:
- identifier: Name
columnName: Name
- identifier: UPNSuffix
columnName: UPNSuffix
- entityType: IP
fieldMappings:
- identifier: Address
columnName: IPAddress
- entityType: URL
fieldMappings:
- identifier: Url
columnName: Url
triggerThreshold: 0
version: 1.2.5
id: ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f
query: |
let dt_lookBack = 1h;
let ioc_lookBack = 14d;
let emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$';
let aadFunc = (tableName:string){
ThreatIntelligenceIndicator
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId
| where ExpirationDateTime > now() and Active == true
// Filter out non ThreatConnect TI Sources
| where SourceSystem startswith "ThreatConnect-"
//Filtering the table for Email related IOCs
| where isnotempty(EmailSenderAddress)
// 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 (
table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)
//Normalizing the column to lower case for exact match with EmailSenderAddress column
| extend UserPrincipalName = tolower(UserPrincipalName)
| where UserPrincipalName matches regex emailregex
| extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)
| extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)
| extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)
// renaming timestamp column so it is clear the log this came from SigninLogs table
| extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type
)
on $left.EmailSenderAddress == $right.UserPrincipalName
| where SigninLogs_TimeGenerated < ExpirationDateTime
| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName
| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,
EmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,
StatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type
| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])
| extend timestamp = SigninLogs_TimeGenerated
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
triggerOperator: gt
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_EmailEntity_SigninLogs.yaml
severity: Medium
{
"$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/ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f')]",
"properties": {
"alertRuleTemplateName": "ecb68ce7-c309-59a7-a8de-07ccf2a0ea4f",
"customDetails": null,
"description": "'Identifies a match in SigninLogs table from any Email IOC from ThreatConnect TI'\n",
"displayName": "ThreatConnect TI map Email entity to SigninLogs",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "Name",
"identifier": "Name"
},
{
"columnName": "UPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "IPAddress",
"identifier": "Address"
}
]
},
{
"entityType": "URL",
"fieldMappings": [
{
"columnName": "Url",
"identifier": "Url"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/ThreatConnect/Analytic Rules/ThreatConnect_EmailEntity_SigninLogs.yaml",
"query": "let dt_lookBack = 1h;\nlet ioc_lookBack = 14d;\nlet emailregex = @'^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\\.[a-zA-Z0-9-.]+$';\nlet aadFunc = (tableName:string){\nThreatIntelligenceIndicator\n | where TimeGenerated >= ago(ioc_lookBack)\n | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by IndicatorId\n | where ExpirationDateTime > now() and Active == true\n// Filter out non ThreatConnect TI Sources\n| where SourceSystem startswith \"ThreatConnect-\"\n//Filtering the table for Email related IOCs\n| where isnotempty(EmailSenderAddress)\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 (\n table(tableName) | where TimeGenerated >= ago(dt_lookBack) and isnotempty(UserPrincipalName)\n //Normalizing the column to lower case for exact match with EmailSenderAddress column\n | extend UserPrincipalName = tolower(UserPrincipalName)\n | where UserPrincipalName matches regex emailregex\n | extend Status = todynamic(DeviceDetail), LocationDetails = todynamic(LocationDetails)\n | extend StatusCode = tostring(Status.errorCode), StatusDetails = tostring(Status.additionalDetails)\n | extend State = tostring(LocationDetails.state), City = tostring(LocationDetails.city), Region = tostring(LocationDetails.countryOrRegion)\n // renaming timestamp column so it is clear the log this came from SigninLogs table\n | extend SigninLogs_TimeGenerated = TimeGenerated, Type = Type\n)\non $left.EmailSenderAddress == $right.UserPrincipalName\n| where SigninLogs_TimeGenerated < ExpirationDateTime\n| summarize SigninLogs_TimeGenerated = arg_max(SigninLogs_TimeGenerated, *) by IndicatorId, UserPrincipalName\n| project SigninLogs_TimeGenerated, Description, ActivityGroupNames, IndicatorId, ThreatType, Url, ExpirationDateTime, ConfidenceScore,\nEmailSenderName, EmailRecipient, EmailSourceDomain, EmailSourceIpAddress, EmailSubject, FileHashValue, FileHashType, IPAddress, UserPrincipalName, AppDisplayName,\nStatusCode, StatusDetails, NetworkIP, NetworkDestinationIP, NetworkSourceIP, Type\n| extend Name = tostring(split(UserPrincipalName, '@', 0)[0]), UPNSuffix = tostring(split(UserPrincipalName, '@', 1)[0])\n| extend timestamp = SigninLogs_TimeGenerated\n};\nlet aadSignin = aadFunc(\"SigninLogs\");\nlet aadNonInt = aadFunc(\"AADNonInteractiveUserSignInLogs\");\nunion isfuzzy=true aadSignin, aadNonInt\n",
"queryFrequency": "PT1H",
"queryPeriod": "P14D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"CommandAndControl"
],
"techniques": [
"T1071"
],
"templateVersion": "1.2.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}