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 Security Group Configuration Change Detection

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AWS Security Group Configuration Change Detection

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Identifies a change to an AWS Security Group Configuration. A security group is like a virtual firewall, and modifying configurations may allow unauthorized access. Threat actors may abuse this to establish persistence, exfiltrate data, or pivot in an AWS environment.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: low

Risk score: 21

Runs every: 10 minutes

Searches indices from: now-30m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.aws.amazon.com/AWSEC2/latest/WindowsGuide/ec2-security-groups.html

Tags:

Elastic
Cloud
AWS
Continuous Monitoring
SecOps
Network Security

Version: 6 (version history)

Added (Elastic Stack release): 7.15.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic, Austin Songer

Rule license: Elastic License v2

Potential false positives

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A 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 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:ec2.amazonaws.com and
event.action:(AuthorizeSecurityGroupEgress or CreateSecurityGroup or
ModifyInstanceAttribute or ModifySecurityGroupRules or
RevokeSecurityGroupEgress or RevokeSecurityGroupIngress) and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Persistence
- ID: TA0003
- Reference URL: https://attack.mitre.org/tactics/TA0003/
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 6 (8.4.0 release)

Updated query, changed from:

event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.action:(AuthorizeSecurityGroupEgress or CreateSecurityGroup or
ModifyInstanceAttribute or ModifySecurityGroupRules or
RevokeSecurityGroupEgress or RevokeSecurityGroupIngress) and
event.outcome:success

Version 4 (8.2.0 release)

Updated query, changed from:

event.dataset:aws.cloudtrail and event.provider:iam.amazonaws.com and
event.action:(AuthorizeSecurityGroupEgress or CreateSecurityGroup or
ModifyInstanceAttribute or ModifySecurityGroupRules or
RevokeSecurityGroupEgress or RevokeSecurityGroupIngress) and
event.outcome:success

Version 3 (8.1.0 release)

Formatting only

Version 2 (7.16.0 release)

Formatting only

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