Changes to AWS Elastic Load Balancer security groups

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Id	c7bfadd4-34a6-4fa5-82f8-3691a32261e8
Rulename	Changes to AWS Elastic Load Balancer security groups
Description	Elastic Load Balancer distributes incoming traffic across multiple instances in multiple availability Zones. This increases the fault tolerance of your applications. Unwanted changes to Elastic Load Balancer specific security groups could open your environment to attack and hence needs monitoring. More information: https://aws.amazon.com/elasticloadbalancing/.
Severity	Low
Tactics	Persistence
Techniques	T1098
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_LoadBalancerSecGroupChange.yaml
Version	1.0.4
Arm template	c7bfadd4-34a6-4fa5-82f8-3691a32261e8.json

KQL

let EventNameList = dynamic(["ApplySecurityGroupsToLoadBalancer", "SetSecurityGroups"]);
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 EventCount=count(), StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated)
by EventSource, EventName, UserIdentityType,  SourceIpAddress, UserAgent, SessionMfaAuthenticated, AWSRegion,
AdditionalEventData, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, ResponseElements
| extend timestamp = StartTimeUtc

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_LoadBalancerSecGroupChange.yaml
query: |
  let EventNameList = dynamic(["ApplySecurityGroupsToLoadBalancer", "SetSecurityGroups"]);
  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 EventCount=count(), StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated)
  by EventSource, EventName, UserIdentityType,  SourceIpAddress, UserAgent, SessionMfaAuthenticated, AWSRegion,
  AdditionalEventData, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, ResponseElements
  | extend timestamp = StartTimeUtc  
version: 1.0.4
tactics:
- Persistence
triggerThreshold: 0
relevantTechniques:
- T1098
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
- entityType: IP
  fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
kind: Scheduled
queryFrequency: 1d
name: Changes to AWS Elastic Load Balancer security groups
description: |
  'Elastic Load Balancer distributes incoming traffic across multiple instances in multiple availability Zones. This increases the fault tolerance of your applications.
   Unwanted changes to Elastic Load Balancer specific security groups could open your environment to attack and  hence needs monitoring.
   More information: https://aws.amazon.com/elasticloadbalancing/. '  
queryPeriod: 1d
triggerOperator: gt
id: c7bfadd4-34a6-4fa5-82f8-3691a32261e8
status: Available
severity: Low
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
- dataTypes:
  - AWSCloudTrail
  connectorId: AWSS3

ARM