NIST SP 800-53 Rev. 5 SI-4(24) — Indicators Of Compromise : iCompaas Support

NIST SP 800-53 Rev. 5·Control SI-4(24)·high·Component: System and Information Integrity

What this control requires

Discover, collect, and distribute indicators of compromise (IOCs) to defined personnel. These IOCs, identified at the host or network level, provide forensic data on potential intrusions, enabling faster identification and response to security breaches. This control supports the Incident Response System capability within the System and Information Integrity family.
— NIST SP 800-53 Rev. 5, Control SI-4(24)

In plain English

Discover, collect, and distribute indicators of compromise (IOCs) to defined personnel. In practice, this means you can prove you information management-level controls on a defined cadence.

Why it matters

SP 800-53 is the catalogue every U.S. federal authorisation (FedRAMP, FISMA, CMMC) and most regulated industries point at. A missing control surfaces as a Plan of Action & Milestones (POA&M) item that an Authorizing Official must approve before the Authority To Operate is granted or renewed.

This control is rated high. Auditors expect a named owner, a remediation SLA, and a tooling artefact that evidences continuous operation.

What an auditor looks for

A 3PAO (FedRAMP) or Independent Assessor (NIST RMF) tests against NIST SP 800-53A assessment procedures. For each control they expect a documented implementation that addresses every assessment objective (Examine, Interview, Test) and an implementation summary in the System Security Plan.

Within System and Information Integrity, the assessor will trace your implementation back to the catalogue reference (Control SI-4(24)) and look for objective evidence on the latest two assessment cycles.

How to implement

Incident Response

Runbook. Maintain a runbook keyed by incident type with named roles (IC, comms, scribe), an out-of-band comms channel, and a 72-hour timeline for external notification.

Tabletop. Run a quarterly tabletop exercise (ransomware, insider, supply-chain) and feed gaps back into the runbook.

Network Security

AWS. VPC Flow Logs to S3, default-deny security groups, AWS Network Firewall for north-south, and Transit Gateway for hub-and-spoke segmentation.

Azure. NSGs with deny-by-default, Azure Firewall Premium with TLS inspection, Private Endpoints for PaaS, and Microsoft Defender for Cloud's secure score for drift.

GCP. VPC Service Controls perimeters around sensitive APIs, Cloud NGFW Enterprise for L7 inspection, Private Service Connect for managed services.

Operational checklist

Information. Document the trigger, the owner and the cadence.
Security. Document the trigger, the owner and the cadence.
Data. Document the trigger, the owner and the cadence.
Network. Document the trigger, the owner and the cadence.
Response. Document the trigger, the owner and the cadence.
Scope: management, information, system, personnel, capability, identification, integrity, response.

Evidence to collect

Ticketing Workflow. ticketing_workflow evidence

Workflow metrics (ServiceNow, Jira) show approvals and remediation. Focus: Indicators Of Compromise.

Common pitfalls

Runbooks that name a role but no person, or list a paging channel that no longer exists.
Default-allow egress rules; East-West traffic with no segmentation; jump hosts on the public internet with password auth.

How it maps to other frameworks

Computed from shared tags, control component and key-operation subjects — handy when you are reconciling controls across an audit.

Related controls in NIST SP 800-53 Rev. 5

References

NIST Computer Security Resource Center — NIST SP 800-53 Rev. 5
Catalogue identifier: Control SI-4(24)

Topics: incident responsechange managementnetwork security

NIST SP 800-53 Rev. 5 SI-4(24) — Indicators Of Compromise