AWS GuardDuty CreateIPSet Trusted IP Set Changes (CloudTrail)

ATT&CK techniques

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule flags CloudTrail events where GuardDuty creates an IP set, which can be used to manage trusted or ignored IP addresses. Attackers may attempt to weaken defensive coverage by altering which sources are considered trustworthy. The detection relies on CloudTrail telemetry matching eventSource guardduty.amazonaws.com and eventName CreateIPSet.

Reporting behind it

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AWS GuardDuty CreateIPSet Trusted IP Set Changes (CloudTrail)

Pivot detection · T1685 · 9 related

Changelog

v5

v5
Candidate ingested via manual entry.2026-07-31
v4
Candidate ingested via manual entry.2026-07-31
v3
Candidate ingested via manual entry.2026-07-31
v2
Candidate ingested via manual entry.2026-07-31
v1
No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

aws-cloudtrail-guardduty-trusted-ip-set-updates-via-createipset-6e61ee20

title: AWS GuardDuty CreateIPSet Trusted IP Set Changes (CloudTrail)
id: ae46d5c9-f0ca-48b8-8478-e6185dafbc7b
status: test
description: This rule flags CloudTrail events where GuardDuty creates an IP set, which can be used to manage trusted or ignored IP addresses. Attackers may attempt to weaken defensive coverage by altering which sources are considered trustworthy. The detection relies on CloudTrail telemetry matching eventSource guardduty.amazonaws.com and eventName CreateIPSet.
references:
  - https://github.com/RhinoSecurityLabs/pacu/blob/866376cd711666c775bbfcde0524c817f2c5b181/pacu/modules/guardduty__whitelist_ip/main.py#L9
  - https://github.com/SigmaHQ/sigma/blob/master/rules/cloud/aws/cloudtrail/aws_guardduty_disruption.yml
author: faloker, Huntrule Team
date: 2020-02-11
modified: 2022-10-09
tags:
  - attack.defense-impairment
  - attack.t1685
logsource:
  product: aws
  service: cloudtrail
detection:
  selection_source:
    eventSource: guardduty.amazonaws.com
    eventName: CreateIPSet
  condition: selection_source
falsepositives:
  - Valid change in the GuardDuty (e.g. to ignore internal scanners)
level: high
license: DRL-1.1
related:
  - id: 6e61ee20-ce00-4f8d-8aee-bedd8216f7e3
    type: derived

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