Microsoft Sentinel Analytic Rules
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Creation of EC2 policy and then privilege escalation

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Ida694e977-740c-4578-9f8f-5e39029f1d23
RulenameCreation of EC2 policy and then privilege escalation
DescriptionDetected creation of new EC2 policy and afterwards used one of the attach policy operations (AttachUserPolicy/AttachRolePolicy/AttachGroupPolicy). This might indicate a privilege escalation technique that attackers could use.
SeverityHigh
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_CreatedEC2PolicytoPrivilegeEscalation.yaml
Version1.0.2
Arm templatea694e977-740c-4578-9f8f-5e39029f1d23.json
Deploy To Azure
let EventNameList = dynamic(["AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy"]);
let createPolicy =  dynamic(["CreatePolicy", "CreatePolicyVersion"]);
let timeframe = 1d;
let lookback = 14d;
// Creating Master table with all the events to use with materialize for better performance
let EventInfo = AWSCloudTrail
| where TimeGenerated >= ago(lookback)
| where EventName in (EventNameList) or EventName in (createPolicy);
//Checking for Policy creation event with Full Admin Privileges since lookback period.
let FullAdminPolicyEvents =  materialize(  EventInfo
| where TimeGenerated >= ago(lookback)
| where EventName in (createPolicy)
| 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 "ec2:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "ec2:RunInstances") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "ec2:Run*")) or (Action contains "ec2:*") or (Action contains "ec2:ListInstances" and Action contains "ec2:StartInstance" and Action contains "ec2:ModifyInstanceAttribute") or (Action contains "ec2:List*" and Action contains "ec2:Start*" and Action contains "ec2:Modify*")) and Resource == "*" and Condition == ""
| distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
| project-rename StartTime = TimeGenerated  );
let PolicyAttach = materialize(  EventInfo
| where TimeGenerated >= ago(timeframe)
| where EventName in (EventNameList) and isempty(ErrorCode) and isempty(ErrorMessage)
| extend PolicyName = tostring(split(tostring(parse_json(RequestParameters).policyArn),"/")[1])
| summarize AttachEventCount=count(), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventSource, EventName,   UserIdentityType , UserIdentityArn, SourceIpAddress, UserIdentityUserName = iff(isnotempty(UserIdentityUserName),   UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1])), PolicyName
| extend AttachEvent = pack("StartTime", StartTime, "EndTime", EndTime, "EventName", EventName, "UserIdentityType",   UserIdentityType, "UserIdentityArn", UserIdentityArn, "SourceIpAddress", SourceIpAddress, "UserIdentityUserName", UserIdentityUserName)
| project EventSource, PolicyName, AttachEvent, AttachEventCount
);
// Joining the list of PolicyNames and checking if it has been attached to any Roles/Users/Groups.
// These Roles/Users/Groups will be Privileged and can be used by adversaries as pivot point for privilege escalation via multiple ways.
FullAdminPolicyEvents
| join kind=leftouter
(
    PolicyAttach
)
on PolicyName
| project-away PolicyName1
| extend timestamp = StartTime, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName
severity: High
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_CreatedEC2PolicytoPrivilegeEscalation.yaml
description: |
    'Detected creation of new EC2 policy and afterwards used one of the attach policy operations (AttachUserPolicy/AttachRolePolicy/AttachGroupPolicy). This might indicate a privilege escalation technique that attackers could use.'
triggerOperator: gt
queryPeriod: 1d
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
queryFrequency: 1d
triggerThreshold: 0
tactics:
- PrivilegeEscalation
query: |
  let EventNameList = dynamic(["AttachUserPolicy","AttachRolePolicy","AttachGroupPolicy"]);
  let createPolicy =  dynamic(["CreatePolicy", "CreatePolicyVersion"]);
  let timeframe = 1d;
  let lookback = 14d;
  // Creating Master table with all the events to use with materialize for better performance
  let EventInfo = AWSCloudTrail
  | where TimeGenerated >= ago(lookback)
  | where EventName in (EventNameList) or EventName in (createPolicy);
  //Checking for Policy creation event with Full Admin Privileges since lookback period.
  let FullAdminPolicyEvents =  materialize(  EventInfo
  | where TimeGenerated >= ago(lookback)
  | where EventName in (createPolicy)
  | 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 "ec2:*") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "ec2:RunInstances") or ((Action contains "iam:*" or Action contains "iam:PassRole") and Action contains "ec2:Run*")) or (Action contains "ec2:*") or (Action contains "ec2:ListInstances" and Action contains "ec2:StartInstance" and Action contains "ec2:ModifyInstanceAttribute") or (Action contains "ec2:List*" and Action contains "ec2:Start*" and Action contains "ec2:Modify*")) and Resource == "*" and Condition == ""
  | distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName
  | extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))
  | project-rename StartTime = TimeGenerated  );
  let PolicyAttach = materialize(  EventInfo
  | where TimeGenerated >= ago(timeframe)
  | where EventName in (EventNameList) and isempty(ErrorCode) and isempty(ErrorMessage)
  | extend PolicyName = tostring(split(tostring(parse_json(RequestParameters).policyArn),"/")[1])
  | summarize AttachEventCount=count(), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventSource, EventName,   UserIdentityType , UserIdentityArn, SourceIpAddress, UserIdentityUserName = iff(isnotempty(UserIdentityUserName),   UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1])), PolicyName
  | extend AttachEvent = pack("StartTime", StartTime, "EndTime", EndTime, "EventName", EventName, "UserIdentityType",   UserIdentityType, "UserIdentityArn", UserIdentityArn, "SourceIpAddress", SourceIpAddress, "UserIdentityUserName", UserIdentityUserName)
  | project EventSource, PolicyName, AttachEvent, AttachEventCount
  );
  // Joining the list of PolicyNames and checking if it has been attached to any Roles/Users/Groups.
  // These Roles/Users/Groups will be Privileged and can be used by adversaries as pivot point for privilege escalation via multiple ways.
  FullAdminPolicyEvents
  | join kind=leftouter
  (
      PolicyAttach
  )
  on PolicyName
  | project-away PolicyName1
  | extend timestamp = StartTime, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName  
status: Available
kind: Scheduled
relevantTechniques:
- T1484
version: 1.0.2
id: a694e977-740c-4578-9f8f-5e39029f1d23
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: FullName
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
name: Creation of EC2 policy and then privilege escalation
{
  "$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/a694e977-740c-4578-9f8f-5e39029f1d23')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a694e977-740c-4578-9f8f-5e39029f1d23')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01-preview",
      "properties": {
        "displayName": "Creation of EC2 policy and then privilege escalation",
        "description": "'Detected creation of new EC2 policy and afterwards used one of the attach policy operations (AttachUserPolicy/AttachRolePolicy/AttachGroupPolicy). This might indicate a privilege escalation technique that attackers could use.'\n",
        "severity": "High",
        "enabled": true,
        "query": "let EventNameList = dynamic([\"AttachUserPolicy\",\"AttachRolePolicy\",\"AttachGroupPolicy\"]);\nlet createPolicy =  dynamic([\"CreatePolicy\", \"CreatePolicyVersion\"]);\nlet timeframe = 1d;\nlet lookback = 14d;\n// Creating Master table with all the events to use with materialize for better performance\nlet EventInfo = AWSCloudTrail\n| where TimeGenerated >= ago(lookback)\n| where EventName in (EventNameList) or EventName in (createPolicy);\n//Checking for Policy creation event with Full Admin Privileges since lookback period.\nlet FullAdminPolicyEvents =  materialize(  EventInfo\n| where TimeGenerated >= ago(lookback)\n| where EventName in (createPolicy)\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 \"ec2:*\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"ec2:RunInstances\") or ((Action contains \"iam:*\" or Action contains \"iam:PassRole\") and Action contains \"ec2:Run*\")) or (Action contains \"ec2:*\") or (Action contains \"ec2:ListInstances\" and Action contains \"ec2:StartInstance\" and Action contains \"ec2:ModifyInstanceAttribute\") or (Action contains \"ec2:List*\" and Action contains \"ec2:Start*\" and Action contains \"ec2:Modify*\")) and Resource == \"*\" and Condition == \"\"\n| distinct TimeGenerated, EventName, PolicyName, SourceIpAddress, UserIdentityArn, UserIdentityUserName\n| extend UserIdentityUserName = iff(isnotempty(UserIdentityUserName), UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1]))\n| project-rename StartTime = TimeGenerated  );\nlet PolicyAttach = materialize(  EventInfo\n| where TimeGenerated >= ago(timeframe)\n| where EventName in (EventNameList) and isempty(ErrorCode) and isempty(ErrorMessage)\n| extend PolicyName = tostring(split(tostring(parse_json(RequestParameters).policyArn),\"/\")[1])\n| summarize AttachEventCount=count(), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventSource, EventName,   UserIdentityType , UserIdentityArn, SourceIpAddress, UserIdentityUserName = iff(isnotempty(UserIdentityUserName),   UserIdentityUserName, tostring(split(UserIdentityArn,'/')[-1])), PolicyName\n| extend AttachEvent = pack(\"StartTime\", StartTime, \"EndTime\", EndTime, \"EventName\", EventName, \"UserIdentityType\",   UserIdentityType, \"UserIdentityArn\", UserIdentityArn, \"SourceIpAddress\", SourceIpAddress, \"UserIdentityUserName\", UserIdentityUserName)\n| project EventSource, PolicyName, AttachEvent, AttachEventCount\n);\n// Joining the list of PolicyNames and checking if it has been attached to any Roles/Users/Groups.\n// These Roles/Users/Groups will be Privileged and can be used by adversaries as pivot point for privilege escalation via multiple ways.\nFullAdminPolicyEvents\n| join kind=leftouter\n(\n    PolicyAttach\n)\non PolicyName\n| project-away PolicyName1\n| extend timestamp = StartTime, IPCustomEntity = SourceIpAddress, AccountCustomEntity = UserIdentityUserName\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1484"
        ],
        "alertRuleTemplateName": "a694e977-740c-4578-9f8f-5e39029f1d23",
        "customDetails": null,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "status": "Available",
        "templateVersion": "1.0.2",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_CreatedEC2PolicytoPrivilegeEscalation.yaml"
      }
    }
  ]
}