Microsoft Sentinel Analytic Rules
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Privilege escalation via Lambda policy

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Id8e01c41d-bd4c-4bbe-aed5-18592735052d
RulenamePrivilege escalation via Lambda policy
DescriptionDetected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy on Lambda policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.
SeverityMedium
TacticsPrivilegeEscalation
TechniquesT1484
Required data connectorsAWS
KindScheduled
Query frequency1d
Query period1d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationViaLambdaPolicy.yaml
Version1.0.0
Arm template8e01c41d-bd4c-4bbe-aed5-18592735052d.json
Deploy To Azure
AWSCloudTrail
  | where EventName in ("PutUserPolicy","PutRolePolicy","PutGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
  | extend PolicyName = tostring(parse_json(RequestParameters).policyName)
  | extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement
  | mvexpand Statement
  | extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)
  | extend Action = tostring(Action)
  | where Effect =~ "Allow" and ((((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:CreateFunction" and Action contains "lambda:InvokeFunction") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:Create*" and Action contains "lambda:Invoke*")) or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:*" and Action contains "dynamodb:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:CreateFunction" and Action contains "lambda:CreateEventSourceMapping" and Action contains "dynamodb:PutItem" and Action contains "dynamodb:CreateTable") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:Create*" and Action contains "dynamodb:Put*" and Action contains "dynamodb:Create*")) and Resource == "*" and Condition == ""
  | distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
  | extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
  | extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName
triggerOperator: gt
version: 1.0.0
query: |
  AWSCloudTrail
    | where EventName in ("PutUserPolicy","PutRolePolicy","PutGroupPolicy") and isempty(ErrorCode) and isempty(ErrorMessage)
    | extend PolicyName = tostring(parse_json(RequestParameters).policyName)
    | extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement
    | mvexpand Statement
    | extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)
    | extend Action = tostring(Action)
    | where Effect =~ "Allow" and ((((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:CreateFunction" and Action contains "lambda:InvokeFunction") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:Create*" and Action contains "lambda:Invoke*")) or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:*" and Action contains "dynamodb:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:CreateFunction" and Action contains "lambda:CreateEventSourceMapping" and Action contains "dynamodb:PutItem" and Action contains "dynamodb:CreateTable") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "lambda:Create*" and Action contains "dynamodb:Put*" and Action contains "dynamodb:Create*")) and Resource == "*" and Condition == ""
    | distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
    | extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
    | extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName  
status: Available
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationViaLambdaPolicy.yaml
queryFrequency: 1d
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
name: Privilege escalation via Lambda policy
queryPeriod: 1d
severity: Medium
kind: Scheduled
tactics:
- PrivilegeEscalation
id: 8e01c41d-bd4c-4bbe-aed5-18592735052d
description: |
    'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy on Lambda policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'
relevantTechniques:
- T1484
triggerThreshold: 0
{
  "$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/8e01c41d-bd4c-4bbe-aed5-18592735052d')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/8e01c41d-bd4c-4bbe-aed5-18592735052d')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Privilege escalation via Lambda policy",
        "description": "'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy on Lambda policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'\n",
        "severity": "Medium",
        "enabled": true,
        "query": "AWSCloudTrail\n  | where EventName in (\"PutUserPolicy\",\"PutRolePolicy\",\"PutGroupPolicy\") and isempty(ErrorCode) and isempty(ErrorMessage)\n  | extend PolicyName = tostring(parse_json(RequestParameters).policyName)\n  | extend Statement = parse_json(tostring((parse_json(RequestParameters).policyDocument))).Statement\n  | mvexpand Statement\n  | extend Action = parse_json(Statement).Action , Effect = tostring(parse_json(Statement).Effect), Resource = tostring(parse_json(Statement).Resource), Condition = tostring(parse_json(Statement).Condition)\n  | extend Action = tostring(Action)\n  | where Effect =~ \"Allow\" and ((((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:*\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:CreateFunction\" and Action contains \"lambda:InvokeFunction\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:Create*\" and Action contains \"lambda:Invoke*\")) or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:*\" and Action contains \"dynamodb:*\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:CreateFunction\" and Action contains \"lambda:CreateEventSourceMapping\" and Action contains \"dynamodb:PutItem\" and Action contains \"dynamodb:CreateTable\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"lambda:Create*\" and Action contains \"dynamodb:Put*\" and Action contains \"dynamodb:Create*\")) and Resource == \"*\" and Condition == \"\"\n  | distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName\n  | extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))\n  | extend timestamp = TimeGenerated, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1484"
        ],
        "alertRuleTemplateName": "8e01c41d-bd4c-4bbe-aed5-18592735052d",
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ],
            "entityType": "IP"
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationViaLambdaPolicy.yaml",
        "status": "Available",
        "templateVersion": "1.0.0"
      }
    }
  ]
}