AWSCloudTrail - Changes to AWS Elastic Load Balancer security groups

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Id	c7bfadd4-34a6-4fa5-82f8-3691a32261e8
Rulename	AWSCloudTrail - Changes to AWS Elastic Load Balancer security groups
Description	Detects AWS CloudTrail events that modify Elastic Load Balancer security group associations. Unauthorized changes can expose services to unintended network access or weaken cloud boundary protections. Validate these updates against approved change control and deployment activity.
Severity	Low
Tactics	DefenseEvasion
Techniques	T1562.007
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	1.0.5
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

YAML

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
tactics:
- DefenseEvasion
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
- dataTypes:
  - AWSCloudTrail
  connectorId: AWSS3
alertDetailsOverride:
  alertDisplayNameFormat: AWS ELB security group change by {{AccountName}} in {{AWSRegion}}
  alertDescriptionFormat: Detected {{EventName}} from {{SourceIpAddress}} for account {{RecipientAccountId}} affecting ELB security group settings.
id: c7bfadd4-34a6-4fa5-82f8-3691a32261e8
severity: Low
status: Available
customDetails:
  AWSRegion: AWSRegion
  UserAgent: UserAgent
  EventSource: EventSource
  EventName: EventName
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  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_LoadBalancerSecGroupChange.yaml
kind: Scheduled
queryPeriod: 1d
version: 1.0.5
name: AWSCloudTrail - Changes to AWS Elastic Load Balancer security groups
queryFrequency: 1d
triggerThreshold: 0
relevantTechniques:
- T1562.007
description: |
  Detects AWS CloudTrail events that modify Elastic Load Balancer security group associations. Unauthorized
  changes can expose services to unintended network access or weaken cloud boundary protections. Validate these
  updates against approved change control and deployment activity.  
triggerOperator: gt

ARM