Changes to Amazon VPC settings

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Id	65360bb0-8986-4ade-a89d-af3cf44d28aa
Rulename	Changes to Amazon VPC settings
Description	Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the AWS Cloud where you can launch AWS resources in a virtual network that you define. This identifies changes to Amazon VPC (Virtual Private Cloud) settings such as new ACL entries,routes, routetable or Gateways. More information: https://medium.com/@GorillaStack/the-most-important-aws-cloudtrail-security-events-to-track-a5b9873f8255 and AWS VPC API Docs: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/OperationList-query-vpc.html
Severity	Low
Tactics	PrivilegeEscalation LateralMovement
Techniques	T1078 T1563
Required data connectors	AWS AWSS3
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_ChangeToVPC.yaml
Version	1.0.6
Arm template	65360bb0-8986-4ade-a89d-af3cf44d28aa.json

KQL

let EventNameList = dynamic(["CreateNetworkAclEntry","CreateRoute","CreateRouteTable","CreateInternetGateway","CreateNatGateway"]);
AWSCloudTrail
| where EventName in~ (EventNameList)
| where EventSource != "apigateway.amazonaws.com"
| 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]), "")
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent,
UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, ResponseElements
| extend timestamp = StartTimeUtc

YAML

relevantTechniques:
- T1078
- T1563
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
description: |
  'Amazon Virtual Private Cloud (Amazon VPC) lets you provision a logically isolated section of the AWS Cloud where you can launch AWS resources in a virtual network that you define.
  This identifies changes to Amazon VPC (Virtual Private Cloud) settings such as new ACL entries,routes, routetable or Gateways.
  More information: https://medium.com/@GorillaStack/the-most-important-aws-cloudtrail-security-events-to-track-a5b9873f8255 
  and AWS VPC API Docs: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/OperationList-query-vpc.html'  
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
- connectorId: AWSS3
  dataTypes:
  - AWSCloudTrail
triggerOperator: gt
version: 1.0.6
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_ChangeToVPC.yaml
id: 65360bb0-8986-4ade-a89d-af3cf44d28aa
queryFrequency: 1d
query: |
  let EventNameList = dynamic(["CreateNetworkAclEntry","CreateRoute","CreateRouteTable","CreateInternetGateway","CreateNatGateway"]);
  AWSCloudTrail
  | where EventName in~ (EventNameList)
  | where EventSource != "apigateway.amazonaws.com"
  | 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]), "")
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent,
  UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, ResponseElements
  | extend timestamp = StartTimeUtc  
severity: Low
status: Available
queryPeriod: 1d
name: Changes to Amazon VPC settings
tactics:
- PrivilegeEscalation
- LateralMovement
kind: Scheduled

ARM