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Detection rules › Sigma

AWS ElastiCache Security Group Created

Status
test
Severity
low
Log source
product aws, service cloudtrail
Author
Austin Songer @austinsonger
Source
github.com/SigmaHQ/sigma

Detects when an ElastiCache security group has been created.

Known false positives

  • A ElastiCache security group may be created by a system or network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Security group creations from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

MITRE ATT&CK coverage

TacticTechniques
Persistence

Telemetry coverage

PlatformRecord / event type
AWSCloudTrail event CreateCacheSecurityGroup: Creates a new cache security group to control network access for EC2-Classic ElastiCache clusters.

Rule body

title: AWS ElastiCache Security Group Created
id: 4ae68615-866f-4304-b24b-ba048dfa5ca7
status: test
description: Detects when an ElastiCache security group has been created.
references:
    - https://github.com/elastic/detection-rules/blob/598f3d7e0a63221c0703ad9a0ea7e22e7bc5961e/rules/integrations/aws/persistence_elasticache_security_group_creation.toml
author: Austin Songer @austinsonger
date: 2021-07-24
modified: 2022-10-09
tags:
    - attack.persistence
    - attack.t1136
    - attack.t1136.003
logsource:
    product: aws
    service: cloudtrail
detection:
    selection:
        eventSource: elasticache.amazonaws.com
        eventName: 'CreateCacheSecurityGroup'
    condition: selection
falsepositives:
    - A ElastiCache security group may be created by a system or network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Security group creations from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.


level: low

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    eventSource: elasticache.amazonaws.com
    eventName: 'CreateCacheSecurityGroup'

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
eventNameeq
  • CreateCacheSecurityGroup
field:"aws::eventName" kind:eq value:"CreateCacheSecurityGroup"
eventSourceeq
  • elasticache.amazonaws.com
field:"aws::eventSource" kind:eq value:"elasticache.amazonaws.com"