Cisco - firewall block but success logon to Microsoft Entra ID
Id | 157c0cfc-d76d-463b-8755-c781608cdc1a |
Rulename | Cisco - firewall block but success logon to Microsoft Entra ID |
Description | Correlate IPs blocked by a Cisco firewall appliance with successful Microsoft Entra ID signins. Because the IP was blocked by the firewall, that same IP logging on successfully to Entra ID is potentially suspect and could indicate credential compromise for the user account. |
Severity | Medium |
Tactics | InitialAccess |
Techniques | T1078 |
Required data connectors | AzureActiveDirectory CiscoASA |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml |
Version | 1.0.6 |
Arm template | 157c0cfc-d76d-463b-8755-c781608cdc1a.json |
let aadFunc = (tableName:string){
CommonSecurityLog
| where DeviceVendor =~ "Cisco"
| where DeviceAction =~ "denied"
| where ipv4_is_private(SourceIP) == false
| summarize count() by SourceIP
| join (
// Successful signins from IPs blocked by the firewall solution are suspect
// Include fully successful sign-ins, but also ones that failed only at MFA stage
// as that supposes the password was sucessfully guessed.
table(tableName)
| where ResultType in ("0", "50074", "50076")
) on $left.SourceIP == $right.IPAddress
| extend AccountName = tostring(split(Account, "@")[0]), AccountUPNSuffix = tostring(split(Account, "@")[1])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
triggerThreshold: 0
entityMappings:
- entityType: Account
fieldMappings:
- columnName: UserPrincipalName
identifier: FullName
- columnName: AccountName
identifier: Name
- columnName: AccountUPNSuffix
identifier: UPNSuffix
- entityType: IP
fieldMappings:
- columnName: SourceIP
identifier: Address
requiredDataConnectors:
- dataTypes:
- CommonSecurityLog
connectorId: CiscoASA
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
- dataTypes:
- AADNonInteractiveUserSignInLogs
connectorId: AzureActiveDirectory
queryPeriod: 1d
id: 157c0cfc-d76d-463b-8755-c781608cdc1a
relevantTechniques:
- T1078
triggerOperator: gt
name: Cisco - firewall block but success logon to Microsoft Entra ID
description: |
'Correlate IPs blocked by a Cisco firewall appliance with successful Microsoft Entra ID signins.
Because the IP was blocked by the firewall, that same IP logging on successfully to Entra ID is potentially suspect and could indicate credential compromise for the user account.'
kind: Scheduled
metadata:
source:
kind: Community
author:
name: Microsoft Security Resarch
categories:
domains:
- Security - Network
support:
tier: Community
query: |
let aadFunc = (tableName:string){
CommonSecurityLog
| where DeviceVendor =~ "Cisco"
| where DeviceAction =~ "denied"
| where ipv4_is_private(SourceIP) == false
| summarize count() by SourceIP
| join (
// Successful signins from IPs blocked by the firewall solution are suspect
// Include fully successful sign-ins, but also ones that failed only at MFA stage
// as that supposes the password was sucessfully guessed.
table(tableName)
| where ResultType in ("0", "50074", "50076")
) on $left.SourceIP == $right.IPAddress
| extend AccountName = tostring(split(Account, "@")[0]), AccountUPNSuffix = tostring(split(Account, "@")[1])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
version: 1.0.6
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml
severity: Medium
queryFrequency: 1d
tactics:
- InitialAccess
{
"$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/157c0cfc-d76d-463b-8755-c781608cdc1a')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/157c0cfc-d76d-463b-8755-c781608cdc1a')]",
"properties": {
"alertRuleTemplateName": "157c0cfc-d76d-463b-8755-c781608cdc1a",
"customDetails": null,
"description": "'Correlate IPs blocked by a Cisco firewall appliance with successful Microsoft Entra ID signins.\nBecause the IP was blocked by the firewall, that same IP logging on successfully to Entra ID is potentially suspect and could indicate credential compromise for the user account.'\n",
"displayName": "Cisco - firewall block but success logon to Microsoft Entra ID",
"enabled": true,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"columnName": "UserPrincipalName",
"identifier": "FullName"
},
{
"columnName": "AccountName",
"identifier": "Name"
},
{
"columnName": "AccountUPNSuffix",
"identifier": "UPNSuffix"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIP",
"identifier": "Address"
}
]
}
],
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml",
"query": "let aadFunc = (tableName:string){\nCommonSecurityLog\n| where DeviceVendor =~ \"Cisco\"\n| where DeviceAction =~ \"denied\"\n| where ipv4_is_private(SourceIP) == false\n| summarize count() by SourceIP\n| join (\n // Successful signins from IPs blocked by the firewall solution are suspect\n // Include fully successful sign-ins, but also ones that failed only at MFA stage\n // as that supposes the password was sucessfully guessed.\n table(tableName)\n | where ResultType in (\"0\", \"50074\", \"50076\")\n) on $left.SourceIP == $right.IPAddress\n| extend AccountName = tostring(split(Account, \"@\")[0]), AccountUPNSuffix = tostring(split(Account, \"@\")[1])\n};\nlet aadSignin = aadFunc(\"SigninLogs\");\nlet aadNonInt = aadFunc(\"AADNonInteractiveUserSignInLogs\");\nunion isfuzzy=true aadSignin, aadNonInt\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"severity": "Medium",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1078"
],
"templateVersion": "1.0.6",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}