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:

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&CKTM

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