Possible STRONTIUM attempted credential harvesting - Oct 2020

Back


Id	68271db2-cbe9-4009-b1d3-bb3b5fe5713c
Rulename	Possible STRONTIUM attempted credential harvesting - Oct 2020
Description	Surfaces potential STRONTIUM group Office365 credential harvesting attempts within OfficeActivity Logon events.
Severity	Low
Tactics	CredentialAccess
Techniques	T1110
Required data connectors	Office365
Kind	Scheduled
Query frequency	7d
Query period	14d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy IOC based Threat Protection/Analytic Rules/STRONTIUMOct292020IOCs.yaml
Version	1.0.1
Arm template	68271db2-cbe9-4009-b1d3-bb3b5fe5713c.json

KQL

let User_Agents = dynamic (["Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70", 
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15", 
"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0", 
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36", 
"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"]);
OfficeActivity
| where RecordType in ("AzureActiveDirectoryAccountLogon", "AzureActiveDirectoryStsLogon") 
| where Operation != 'UserLoggedIn'
| extend UserAgent = iff(parse_json(ExtendedProperties)[0].Name =~ "UserAgent", extractjson("$[0].Value", ExtendedProperties, typeof(string)),"")
| mv-expand parse_json(ExtendedProperties)
| where ExtendedProperties.Name =~ "RequestType"
| extend RequestType = todynamic(ExtendedProperties).Value
| where UserAgent =~ "ms-office" or UserAgent has_any (User_Agents)
| summarize authAttempts=dcount(TimeGenerated), firstAttempt=min(TimeGenerated), lastAttempt=max(TimeGenerated), uniqueIPs=dcount(ClientIP), uniqueAccounts=dcount(UserId), attemptedAccounts=make_set(UserId) by UserAgent
| where authAttempts > 500
| extend timestamp = firstAttempt
| sort by uniqueAccounts

YAML

queryFrequency: 7d
severity: Low
triggerThreshold: 0
relevantTechniques:
- T1110
query: |
  let User_Agents = dynamic (["Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70", 
  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15", 
  "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0", 
  "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36", 
  "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36"]);
  OfficeActivity
  | where RecordType in ("AzureActiveDirectoryAccountLogon", "AzureActiveDirectoryStsLogon") 
  | where Operation != 'UserLoggedIn'
  | extend UserAgent = iff(parse_json(ExtendedProperties)[0].Name =~ "UserAgent", extractjson("$[0].Value", ExtendedProperties, typeof(string)),"")
  | mv-expand parse_json(ExtendedProperties)
  | where ExtendedProperties.Name =~ "RequestType"
  | extend RequestType = todynamic(ExtendedProperties).Value
  | where UserAgent =~ "ms-office" or UserAgent has_any (User_Agents)
  | summarize authAttempts=dcount(TimeGenerated), firstAttempt=min(TimeGenerated), lastAttempt=max(TimeGenerated), uniqueIPs=dcount(ClientIP), uniqueAccounts=dcount(UserId), attemptedAccounts=make_set(UserId) by UserAgent
  | where authAttempts > 500
  | extend timestamp = firstAttempt
  | sort by uniqueAccounts  
id: 68271db2-cbe9-4009-b1d3-bb3b5fe5713c
triggerOperator: gt
version: 1.0.1
requiredDataConnectors:
- connectorId: Office365
  dataTypes:
  - OfficeActivity
description: |
    'Surfaces potential STRONTIUM group Office365 credential harvesting attempts within OfficeActivity Logon events.'
queryPeriod: 14d
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy IOC based Threat Protection/Analytic Rules/STRONTIUMOct292020IOCs.yaml
status: Available
name: Possible STRONTIUM attempted credential harvesting - Oct 2020
tactics:
- CredentialAccess
kind: Scheduled

ARM

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/68271db2-cbe9-4009-b1d3-bb3b5fe5713c')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/68271db2-cbe9-4009-b1d3-bb3b5fe5713c')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Possible STRONTIUM attempted credential harvesting - Oct 2020",
        "description": "'Surfaces potential STRONTIUM group Office365 credential harvesting attempts within OfficeActivity Logon events.'\n",
        "severity": "Low",
        "enabled": true,
        "query": "let User_Agents = dynamic ([\"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70\", \n\"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15\", \n\"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0\", \n\"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36\", \n\"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36\"]);\nOfficeActivity\n| where RecordType in (\"AzureActiveDirectoryAccountLogon\", \"AzureActiveDirectoryStsLogon\") \n| where Operation != 'UserLoggedIn'\n| extend UserAgent = iff(parse_json(ExtendedProperties)[0].Name =~ \"UserAgent\", extractjson(\"$[0].Value\", ExtendedProperties, typeof(string)),\"\")\n| mv-expand parse_json(ExtendedProperties)\n| where ExtendedProperties.Name =~ \"RequestType\"\n| extend RequestType = todynamic(ExtendedProperties).Value\n| where UserAgent =~ \"ms-office\" or UserAgent has_any (User_Agents)\n| summarize authAttempts=dcount(TimeGenerated), firstAttempt=min(TimeGenerated), lastAttempt=max(TimeGenerated), uniqueIPs=dcount(ClientIP), uniqueAccounts=dcount(UserId), attemptedAccounts=make_set(UserId) by UserAgent\n| where authAttempts > 500\n| extend timestamp = firstAttempt\n| sort by uniqueAccounts\n",
        "queryFrequency": "P7D",
        "queryPeriod": "P14D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "CredentialAccess"
        ],
        "techniques": [
          "T1110"
        ],
        "alertRuleTemplateName": "68271db2-cbe9-4009-b1d3-bb3b5fe5713c",
        "customDetails": null,
        "entityMappings": null,
        "templateVersion": "1.0.1",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Legacy IOC based Threat Protection/Analytic Rules/STRONTIUMOct292020IOCs.yaml",
        "status": "Available"
      }
    }
  ]
}