Privilege escalation via CRUD KMS policy
Id | d7c39e15-997f-49e5-a782-73bf07db8aa5 |
Rulename | Privilege escalation via CRUD KMS policy |
Description | Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy by CRUD KMS policy. Attackers could use these operations for privilege escalation. Verify these actions with the user. |
Severity | Medium |
Tactics | PrivilegeEscalation |
Techniques | T1484 |
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 Web Services/Analytic Rules/AWS_PrivilegeEscalationViaCRUDKMSPolicy.yaml |
Version | 1.0.0 |
Arm template | d7c39e15-997f-49e5-a782-73bf07db8aa5.json |
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 "kms:Create" and (Action contains "kms:Get" or Action contains "kms:Describe") and (Action contains "kms:Disable" or Action contains "kms:Enable") and Action contains "kms:Delete") 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
version: 1.0.0
name: Privilege escalation via CRUD KMS policy
severity: Medium
queryFrequency: 1d
kind: Scheduled
queryPeriod: 1d
description: |
'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy by CRUD KMS policy. Attackers could use these operations for privilege escalation. Verify these actions with the user.'
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 "kms:Create" and (Action contains "kms:Get" or Action contains "kms:Describe") and (Action contains "kms:Disable" or Action contains "kms:Enable") and Action contains "kms:Delete") 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
tactics:
- PrivilegeEscalation
triggerOperator: gt
entityMappings:
- entityType: Account
fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
- entityType: IP
fieldMappings:
- columnName: IPCustomEntity
identifier: Address
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_PrivilegeEscalationViaCRUDKMSPolicy.yaml
requiredDataConnectors:
- connectorId: AWS
dataTypes:
- AWSCloudTrail
status: Available
relevantTechniques:
- T1484
id: d7c39e15-997f-49e5-a782-73bf07db8aa5
{
"$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/d7c39e15-997f-49e5-a782-73bf07db8aa5')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/d7c39e15-997f-49e5-a782-73bf07db8aa5')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01-preview",
"properties": {
"displayName": "Privilege escalation via CRUD KMS policy",
"description": "'Detected usage of AttachUserPolicy/AttachGroupPolicy/AttachRolePolicy by CRUD KMS 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 \"kms:Create\" and (Action contains \"kms:Get\" or Action contains \"kms:Describe\") and (Action contains \"kms:Disable\" or Action contains \"kms:Enable\") and Action contains \"kms:Delete\") 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": "d7c39e15-997f-49e5-a782-73bf07db8aa5",
"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_PrivilegeEscalationViaCRUDKMSPolicy.yaml",
"templateVersion": "1.0.0",
"status": "Available"
}
}
]
}