IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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AWS ElastiCache Security Group Modified or Deleted

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AWS ElastiCache Security Group Modified or Deleted

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Identifies when an ElastiCache security group has been modified or deleted.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: low

Risk score: 21

Runs every: 10 minutes

Searches indices from: now-60m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.aws.amazon.com/AmazonElastiCache/latest/APIReference/Welcome.html

Tags:

Elastic
Cloud
AWS
Continuous Monitoring
SecOps
Monitoring

Version: 4 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positives

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A ElastiCache security group deletion may be done 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 deletions by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

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Rule query

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event.dataset:aws.cloudtrail and
event.provider:elasticache.amazonaws.com and event.action:("Delete
Cache Security Group" or "Authorize Cache Security Group Ingress" or
"Revoke Cache Security Group Ingress" or
"AuthorizeCacheSecurityGroupEgress" or
"RevokeCacheSecurityGroupEgress") and event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/

Rule version history

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Version 4 (8.4.0 release)

Updated query, changed from:

event.dataset:aws.cloudtrail and
event.provider:elasticache.amazonaws.com and event.action:("Delete
Cache Security Group" or "Authorize Cache Security Group Ingress" or
"Revoke Cache Security Group Ingress" or
"AuthorizeCacheSecurityGroupEgress" or
"RevokeCacheSecurityGroupEgress") and event.outcome:success

Version 2 (8.1.0 release)

Formatting only

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