AWSCloudTrail - Privilege escalation with FullAccess managed policy

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Id	afb4191b-a142-4065-a0da-f721ee3d006c
Rulename	AWSCloudTrail - Privilege escalation with FullAccess managed policy
Description	Detects successful attachment of AWS managed policies containing FullAccess permissions to users, roles, or groups, excluding admin-named policies. This action can rapidly expand privilege scope and should be reviewed as potential cloud privilege escalation.
Severity	Medium
Tactics	PrivilegeEscalation Persistence
Techniques	T1098.003
Required data connectors	AWS
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_PrivilegeEscalationFullAccessManagedPolicy.yaml
Version	1.0.2
Arm template	afb4191b-a142-4065-a0da-f721ee3d006c.json

KQL

AWSCloudTrail
| where  EventName in ("AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
| where tostring(parse_json(RequestParameters).policyArn) has "FullAccess" and tostring(parse_json(RequestParameters).policyArn) !has "Admin"
| 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, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, UserIdentityArn, ResponseElements

YAML

queryFrequency: 1d
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
triggerThreshold: 0
triggerOperator: gt
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_PrivilegeEscalationFullAccessManagedPolicy.yaml
alertDetailsOverride:
  alertDisplayNameFormat: AWS FullAccess managed policy attachment by {{AccountName}}
  alertDescriptionFormat: Detected {{EventName}} from {{SourceIpAddress}} attaching FullAccess managed policy in account {{RecipientAccountId}}.
query: |
  AWSCloudTrail
  | where  EventName in ("AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
  | where tostring(parse_json(RequestParameters).policyArn) has "FullAccess" and tostring(parse_json(RequestParameters).policyArn) !has "Admin"
  | 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, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, UserIdentityArn, ResponseElements
tactics:
- PrivilegeEscalation
- Persistence
queryPeriod: 1d
customDetails:
  UserIdentityArn: UserIdentityArn
  EventSource: EventSource
  AWSRegion: AWSRegion
  EventName: EventName
relevantTechniques:
- T1098.003
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
id: afb4191b-a142-4065-a0da-f721ee3d006c
kind: Scheduled
version: 1.0.2
description: |
  Detects successful attachment of AWS managed policies containing FullAccess permissions to users, roles, or
  groups, excluding admin-named policies. This action can rapidly expand privilege scope and should be reviewed
  as potential cloud privilege escalation.
status: Available
name: AWSCloudTrail - Privilege escalation with FullAccess managed policy

ARM

{
  "$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/afb4191b-a142-4065-a0da-f721ee3d006c')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/afb4191b-a142-4065-a0da-f721ee3d006c')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Detected {{EventName}} from {{SourceIpAddress}} attaching FullAccess managed policy in account {{RecipientAccountId}}.",
          "alertDisplayNameFormat": "AWS FullAccess managed policy attachment by {{AccountName}}"
        },
        "alertRuleTemplateName": "afb4191b-a142-4065-a0da-f721ee3d006c",
        "customDetails": {
          "AWSRegion": "AWSRegion",
          "EventName": "EventName",
          "EventSource": "EventSource",
          "UserIdentityArn": "UserIdentityArn"
        },
        "description": "Detects successful attachment of AWS managed policies containing FullAccess permissions to users, roles, or\ngroups, excluding admin-named policies. This action can rapidly expand privilege scope and should be reviewed\nas potential cloud privilege escalation.\n",
        "displayName": "AWSCloudTrail - Privilege escalation with FullAccess managed policy",
        "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_PrivilegeEscalationFullAccessManagedPolicy.yaml",
        "query": "AWSCloudTrail\n| where  EventName in (\"AttachUserPolicy\",\"AttachRolePolicy\",\"AttachGroupPolicy\") and isempty(ErrorCode) and isempty(ErrorMessage)\n| where tostring(parse_json(RequestParameters).policyArn) has \"FullAccess\" and tostring(parse_json(RequestParameters).policyArn) !has \"Admin\"\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, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, UserIdentityArn, ResponseElements\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [
          "T1098.003"
        ],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1098"
        ],
        "templateVersion": "1.0.2",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}