FedRAMP Continuous Monitoring (ConMon) requirements mandate that government cloud systems maintain ongoing security visibility — not just annual assessment snapshots. Building an event-driven security architecture allows programs to automatically detect, investigate, and in some cases remediate security findings as they occur rather than discovering them during periodic review cycles.
The ConMon Requirements That Drive Event-Driven Security
FedRAMP ConMon requirements specify ongoing security activities including: - Monthly vulnerability scanning of OS and web application layers - Continuous asset and configuration monitoring - Security incident detection and response - Ongoing security assessment of controls - Plan of Action and Milestones (POA&M) maintenance
These requirements create a need for automated security monitoring that generates findings continuously, not just at assessment events. An event-driven security architecture is the implementation pattern that makes continuous monitoring achievable at scale.
Core Architecture: Security Event Flow
A government cloud event-driven security architecture on AWS GovCloud:
Security Services (GuardDuty, Config, Inspector, Macie, Security Hub)
↓ Findings
AWS Security Hub (aggregation, normalization, severity enrichment)
↓ Security Hub findings
Amazon EventBridge (routing rules by finding type/severity)
↓ Events
├── Lambda Functions (automated remediation for specific patterns)
├── SNS Topics (notification to security team)
├── S3 (archival for compliance evidence)
└── SIEM Integration (Splunk, QRadar, Sentinel via Kinesis or direct API)
Each component handles a specific function in the security event lifecycle.
AWS Security Services for Government Cloud
Amazon GuardDuty: Threat detection service that analyzes CloudTrail, VPC Flow Logs, and DNS logs for malicious or unauthorized behavior. GuardDuty is available in GovCloud and is FedRAMP High authorized. Findings include: EC2 instances communicating with known malicious IPs, IAM anomaly detection, cryptocurrency mining detection, S3 policy changes indicating potential exfiltration.
GuardDuty is a no-brainer first security service to enable — it requires no agents, analyzes existing log sources, and generates high-signal findings with low false positive rates compared to manual log review.
AWS Config: Tracks resource configuration changes across the account. Config Rules evaluate whether resources comply with defined configuration policies — "S3 buckets must have public access blocked," "EC2 instances must use IMDSv2," "RDS instances must be encrypted." Config findings directly address FedRAMP CM (Configuration Management) control family requirements.
AWS Inspector v2: Vulnerability management for EC2 instances and container images. Inspector runs continuously and automatically reports new vulnerabilities as they are published to the NVD. This addresses FedRAMP RA-5 (Vulnerability Monitoring and Scanning) control requirements with continuous rather than periodic scanning.
Amazon Macie: Data classification and sensitive data discovery for S3 buckets. Macie automatically discovers PII, financial data, credentials, and other sensitive data types in S3 — critical for programs where CUI handling in S3 must be monitored.
AWS Security Hub: The aggregation and correlation layer. Security Hub normalizes findings from GuardDuty, Config, Inspector, Macie, IAM Access Analyzer, and third-party tools (via integrations) into a standardized format (ASFF — Amazon Security Finding Format). Security Hub applies severity scoring, deduplication, and provides the NIST 800-53 control mapping that directly generates ConMon evidence.
EventBridge Routing: Automating Response by Finding Type
Amazon EventBridge consumes Security Hub findings and routes them to appropriate response targets based on finding severity and type:
Example routing rules:
// Critical severity findings → immediate notification + ticket creation
{
"source": ["aws.securityhub"],
"detail-type": ["Security Hub Findings - Imported"],
"detail": {
"findings": {
"Severity": { "Label": ["CRITICAL"] }
}
}
}
// Config non-compliance → automated remediation Lambda
{
"source": ["aws.config"],
"detail-type": ["Config Rules Compliance Change"],
"detail": {
"newEvaluationResult": {
"complianceType": ["NON_COMPLIANT"]
}
}
}
Automated remediation examples: - S3 bucket made public → Lambda immediately sets BlockPublicAccess = true and notifies ISSO - Security group with 0.0.0.0/0 ingress on sensitive port → Lambda restricts the rule and creates incident ticket - IAM user with no MFA enabled → Lambda sends mandatory email to user and the ISSO, creates POA&M entry - GuardDuty finding for known malicious IP → Lambda blocks IP in relevant security groups
Automated remediation requires careful design — over-aggressive automation can disrupt legitimate operations. Design for notification + quarantine for most findings; automated blocking only for specific, high-confidence patterns with clear operational impact.
SIEM Integration for Holistic Security Visibility
Most government programs maintain a Security Information and Event Management (SIEM) system — Splunk, IBM QRadar, Microsoft Sentinel, or similar — as the central security monitoring platform. AWS Security Hub findings integrate with these SIEMs via:
Kinesis Data Firehose: Stream Security Hub findings in near-real-time to a SIEM that accepts Kinesis input. Low latency, scalable to high event volume.
S3 export + SIEM S3 connector: Export findings to S3, SIEM polls S3 for new files. Higher latency but simpler to configure for SIEMs with native S3 connectors.
Direct API integration: Some SIEMs provide native AWS Security Hub integrations that poll the Security Hub API. Check vendor documentation for current native integration support.
Integration enables correlation of AWS security findings with network-level events, endpoint telemetry, and identity events in a unified view — essential for comprehensive incident investigation.
Generating ConMon Evidence from the Event-Driven Architecture
The event-driven architecture generates continuous evidence that directly satisfies FedRAMP ConMon requirements:
CA-7 (Continuous Monitoring): Security Hub finding reports exported monthly demonstrate ongoing monitoring activity and finding resolution status.
RA-5 (Vulnerability Scanning): Inspector continuous scan reports demonstrate ongoing vulnerability monitoring. Monthly configuration snapshots from Config satisfy periodic assessment requirements.
SI-4 (System Monitoring): GuardDuty threat detection findings demonstrate active monitoring for malicious activity.
CM-7 (Least Functionality): Config Rules compliance history demonstrates ongoing configuration enforcement.
Structure ConMon evidence packages around Security Hub's NIST 800-53 compliance view — it provides a control-by-control finding summary that maps directly to the ConMon evidence structure.
Rutagon designs and implements cloud security architectures and ConMon programs for government systems. Contact us to discuss your continuous monitoring requirements.
Frequently Asked Questions
Is AWS Security Hub FedRAMP authorized in GovCloud?
Yes. AWS Security Hub is available in AWS GovCloud and carries FedRAMP High authorization as part of AWS's GovCloud FedRAMP package. Security Hub, GuardDuty, Config, Inspector, and Macie are all available in GovCloud and covered by AWS's FedRAMP authorization. Check the AWS services in scope page for GovCloud for the current list of FedRAMP authorized services.
How does automated remediation affect the change management process?
Automated remediation creates rapid configuration changes that must be tracked in the program's change management system. Every automated remediation action should be logged — what triggered it, what change was made, the timestamp, and the account/resource affected. This log serves as both a ConMon artifact and a change record. Some programs require that all automated remediation actions be reviewed by the ISSO retroactively to maintain oversight.
How do I structure FedRAMP ConMon evidence from AWS Security Hub?
Security Hub provides a "Security standards" view that shows your compliance posture against NIST 800-53 (or CIS Controls, PCI DSS, etc.) control by control. Export this view monthly as a PDF or via the Security Hub API. Supplement with GuardDuty finding summary reports, Inspector vulnerability assessment reports, and Config compliance history reports. These documents form the bulk of the monthly ConMon evidence package. The ISSO reviews the reports, documents any new findings in the POA&M, and confirms resolution of previously tracked findings.
Can I automate POA&M management with event-driven security?
Yes, to a degree. New Security Hub findings above a defined severity threshold can automatically create POA&M entries in a ticketing system (Jira, ServiceNow) with pre-populated fields (finding description, control reference, risk level). When a finding is remediated (Config rule returns to compliant, Inspector finding is resolved), the event can automatically update the POA&M entry status. This automation reduces the manual POA&M management burden significantly — though ISSO review and approval of POA&M changes remains a human responsibility.