AWSCloudTrail - Successful API executed from a Tor exit node

let TorNodes = (
externaldata (TorIP:string)
[h@'https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip']
with (ignoreFirstRecord=true));
AWSCloudTrail
| where SourceIpAddress in (TorNodes) and isempty(ErrorCode) and isempty(ErrorMessage)
| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
| project TimeGenerated, SourceIpAddress, AccountName, AccountUPNSuffix, UserIdentityArn, UserIdentityUserName, UserIdentityPrincipalid, EventName, EventSource, AWSRegion, RecipientAccountId

name: AWSCloudTrail - Successful API executed from a Tor exit node
triggerOperator: gt
query: |
  let TorNodes = (
  externaldata (TorIP:string)
  [h@'https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip']
  with (ignoreFirstRecord=true));
  AWSCloudTrail
  | where SourceIpAddress in (TorNodes) and isempty(ErrorCode) and isempty(ErrorMessage)
  | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
  | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
  | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
  | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
      AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
  | project TimeGenerated, SourceIpAddress, AccountName, AccountUPNSuffix, UserIdentityArn, UserIdentityUserName, UserIdentityPrincipalid, EventName, EventSource, AWSRegion, RecipientAccountId
queryFrequency: 1d
description: |
  Identifies successful AWS CloudTrail API activity originating from an IP address identified as a TOR exit node in
  the external TOR list hosted at https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip. The rule alerts
  only when CloudTrail indicates the request completed successfully with no ErrorCode and no ErrorMessage, and the source
  IP is present in the TOR exit node list.
id: 0adab960-5565-4978-ba6d-044553e4acc4
triggerThreshold: 0
queryPeriod: 1d
version: 1.0.2
kind: Scheduled
customDetails:
  AWSRegion: AWSRegion
  EventName: EventName
  EventSource: EventSource
  UserIdentityArn: UserIdentityArn
status: Available
severity: High
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_APIfromTor.yaml
alertDetailsOverride:
  alertDescriptionFormat: A successful AWS API call was observed from TOR exit node IP {{SourceIpAddress}} for account {{AccountName}}.
  alertDisplayNameFormat: 'Successful AWS API call from TOR exit node: {{AccountName}} from {{SourceIpAddress}}'
relevantTechniques:
- T1204
tactics:
- Execution
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
  entityType: IP

{
  "$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/0adab960-5565-4978-ba6d-044553e4acc4')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0adab960-5565-4978-ba6d-044553e4acc4')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "A successful AWS API call was observed from TOR exit node IP {{SourceIpAddress}} for account {{AccountName}}.",
          "alertDisplayNameFormat": "Successful AWS API call from TOR exit node: {{AccountName}} from {{SourceIpAddress}}"
        },
        "alertRuleTemplateName": "0adab960-5565-4978-ba6d-044553e4acc4",
        "customDetails": {
          "AWSRegion": "AWSRegion",
          "EventName": "EventName",
          "EventSource": "EventSource",
          "UserIdentityArn": "UserIdentityArn"
        },
        "description": "Identifies successful AWS CloudTrail API activity originating from an IP address identified as a TOR exit node in\nthe external TOR list hosted at https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip. The rule alerts\nonly when CloudTrail indicates the request completed successfully with no ErrorCode and no ErrorMessage, and the source\nIP is present in the TOR exit node list.\n",
        "displayName": "AWSCloudTrail - Successful API executed from a Tor exit node",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              },
              {
                "columnName": "RecipientAccountId",
                "identifier": "CloudAppAccountId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_APIfromTor.yaml",
        "query": "let TorNodes = (\nexternaldata (TorIP:string)\n[h@'https://firewalliplists.gypthecat.com/lists/kusto/kusto-tor-exit.csv.zip']\nwith (ignoreFirstRecord=true));\nAWSCloudTrail\n| where SourceIpAddress in (TorNodes) and isempty(ErrorCode) and isempty(ErrorMessage)\n| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)\n| extend UserName = tostring(split(UserIdentityArn, '/')[-1])\n| extend AccountName = case( UserIdentityPrincipalid == \"Anonymous\", \"Anonymous\", isempty(UserIdentityUserName), UserName, UserIdentityUserName)\n| extend AccountName = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 0)[0]), AccountName),\n    AccountUPNSuffix = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 1)[0]), \"\")\n| project TimeGenerated, SourceIpAddress, AccountName, AccountUPNSuffix, UserIdentityArn, UserIdentityUserName, UserIdentityPrincipalid, EventName, EventSource, AWSRegion, RecipientAccountId\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "High",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1204"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}