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 | 1.0.5 |
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
queryFrequency: 1d
severity: Medium
id: 157c0cfc-d76d-463b-8755-c781608cdc1a
requiredDataConnectors:
- dataTypes:
- CommonSecurityLog
connectorId: CiscoASA
- dataTypes:
- SigninLogs
connectorId: AzureActiveDirectory
- dataTypes:
- AADNonInteractiveUserSignInLogs
connectorId: AzureActiveDirectory
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Detections/MultipleDataSources/SigninFirewallCorrelation.yaml
kind: Scheduled
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.'
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 == $right.IPAddress
| extend AccountName = tostring(split(Account, "@")[0]), AccountUPNSuffix = tostring(split(Account, "@")[1])
};
let aadSignin = aadFunc("SigninLogs");
let aadNonInt = aadFunc("AADNonInteractiveUserSignInLogs");
union isfuzzy=true aadSignin, aadNonInt
tactics:
- InitialAccess
triggerThreshold: 0
triggerOperator: gt
metadata:
categories:
domains:
- Security - Network
source:
kind: Community
support:
tier: Community
author:
name: Microsoft Security Resarch
relevantTechniques:
- T1078
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: UserPrincipalName
- identifier: Name
columnName: AccountName
- identifier: UPNSuffix
columnName: AccountUPNSuffix
- entityType: IP
fieldMappings:
- identifier: Address
columnName: SourceIP
version: 1.0.5
name: Cisco - firewall block but success logon to Microsoft Entra ID
queryPeriod: 1d
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2023-02-01-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\nand 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",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"InitialAccess"
],
"techniques": [
"T1078"
],
"templateVersion": "1.0.5",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}