Changes made to AWS CloudTrail logs

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Id	610d3850-c26f-4f20-8d86-f10fdf2425f5
Rulename	Changes made to AWS CloudTrail logs
Description	Attackers often try to hide their steps by deleting or stopping the collection of logs that could show their activity. This alert identifies any manipulation of AWS CloudTrail, Cloudwatch/EventBridge or VPC Flow logs. More Information: AWS CloudTrail API: https://docs.aws.amazon.com/awscloudtrail/latest/APIReference/API_Operations.html AWS Cloudwatch/Eventbridge API: https://docs.aws.amazon.com/eventbridge/latest/APIReference/API_Operations.html AWS DelteteFlowLogs API : https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteFlowLogs.html '
Severity	Low
Tactics	DefenseEvasion
Techniques	T1070
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_ClearStopChangeTrailLogs.yaml
Version	1.0.4
Arm template	610d3850-c26f-4f20-8d86-f10fdf2425f5.json

KQL

let EventNameList = dynamic(["UpdateTrail","DeleteTrail","StopLogging","DeleteFlowLogs","DeleteEventBus"]);
AWSCloudTrail
| where EventName in~ (EventNameList)
| 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
| extend timestamp = StartTimeUtc

YAML

relevantTechniques:
- T1070
queryPeriod: 1d
triggerOperator: gt
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_ClearStopChangeTrailLogs.yaml
description: |
  'Attackers often try to hide their steps by deleting or stopping the collection of logs that could show their activity.
  This alert identifies any manipulation of AWS CloudTrail, Cloudwatch/EventBridge or VPC Flow logs.
  More Information: AWS CloudTrail API: https://docs.aws.amazon.com/awscloudtrail/latest/APIReference/API_Operations.html 
  AWS Cloudwatch/Eventbridge API: https://docs.aws.amazon.com/eventbridge/latest/APIReference/API_Operations.html 
  AWS DelteteFlowLogs API : https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteFlowLogs.html '   
tactics:
- DefenseEvasion
severity: Low
status: Available
kind: Scheduled
triggerThreshold: 0
queryFrequency: 1d
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
- dataTypes:
  - AWSCloudTrail
  connectorId: AWSS3
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
id: 610d3850-c26f-4f20-8d86-f10fdf2425f5
query: |
  let EventNameList = dynamic(["UpdateTrail","DeleteTrail","StopLogging","DeleteFlowLogs","DeleteEventBus"]);
  AWSCloudTrail
  | where EventName in~ (EventNameList)
  | 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
  | extend timestamp = StartTimeUtc  
name: Changes made to AWS CloudTrail logs

ARM