AWS EC2 Flow Log Deletion

Elastic Stack Serverless Security

Identifies the deletion of one or more flow logs in AWS Elastic Compute Cloud (EC2). An adversary may delete flow logs in an attempt to evade defenses.

Rule type: query

Rule indices:

• filebeat-*
• logs-aws*

Severity: high

Risk score: 73

Runs every: 10m

Searches indices from: now-60m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://awscli.amazonaws.com/v2/documentation/api/latest/reference/ec2/delete-flow-logs.html
• https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteFlowLogs.html

Tags:

• Elastic
• Cloud
• AWS
• Continuous Monitoring
• SecOps
• Log Auditing

Version: 7

Rule authors:

• Elastic

Rule license: Elastic License v2

The AWS Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and event.action:DeleteFlowLogs and event.outcome:success

Framework: MITRE ATT&CKTM

• 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/

• Sub-technique:

  • Name: Disable or Modify Tools
  • ID: T1562.001
  • Reference URL: https://attack.mitre.org/techniques/T1562/001/