Best Cloud Detection and Response Solutions

Cloud Detection and Response (CDR) is the practice of monitoring cloud infrastructure — IaaS control planes, container workloads, serverless functions, cloud identity, and cloud storage — for security threats and responding to them. CDR addresses the gap left by endpoint EDR tools, which don't cover cloud-native resources like Lambda functions, EC2 metadata APIs, or S3 bucket access.

CSPM (Cloud Security Posture Management) identifies misconfigurations in cloud infrastructure: open S3 buckets, overly permissive IAM policies, unencrypted storage. CDR detects active threats and attacks at runtime: a compromised credential querying the metadata API, unusual API call patterns, or privilege escalation in IAM. CSPM is proactive posture; CDR is active threat detection.

Priority cloud telemetry for CDR: (1) AWS CloudTrail / Azure Activity Logs / GCP Audit Logs — all API calls including privilege changes, resource creation, and data access; (2) AWS VPC Flow Logs / Azure NSG Flow Logs — network traffic patterns; (3) AWS GuardDuty / Azure Defender findings — native cloud threat detections; (4) Container runtime events (Falco, CrowdStrike) — process and network events within containers; (5) IAM access logs — who accessed what resources.

Critical cloud attack scenarios: (1) CloudTrail disabling — attackers disable logging to hide their tracks; (2) IAM privilege escalation — creating admin roles or attaching overly permissive policies; (3) EC2 metadata API abuse — extracting instance IAM credentials via SSRF; (4) S3 data exfiltration — unusual data download from sensitive buckets; (5) Lambda function modification — backdooring serverless functions; (6) Cloud account takeover via credential stuffing or phishing.

Cloud resources (containers, Lambda functions, EC2 instances) can live for seconds or minutes, making traditional endpoint-based forensics impossible. CDR platforms address this through: streaming telemetry ingestion that captures events before the resource terminates; immutable audit logs from the cloud control plane that persist after resource termination; and attack chain reconstruction from cloud API logs even when the compute resource no longer exists.

Agentless CDR (monitoring cloud API logs without deploying agents on compute resources) catches control-plane attacks well: credential abuse, IAM changes, storage access, network configuration changes. It misses host-level attacks that don't generate API calls: memory-only malware, container escape, and file system manipulation. A combination of agentless control-plane monitoring and agent-based workload monitoring provides the most complete coverage.

Compromised cloud credential indicators: (1) API calls from an IP not associated with the credential's usual source; (2) Unusual API call patterns — new API actions never previously called by this credential; (3) Resource creation in regions never previously used; (4) API calls at unusual times (3 AM if the credential is used by a human); (5) High-velocity API calls suggesting automated credential abuse. CDR platforms establish per-credential baselines to detect these anomalies.

CNAPP (Cloud-Native Application Protection Platform) is an integrated platform that combines CSPM, CWPP (Cloud Workload Protection Platform), CDR, container security, and IaC scanning into a single vendor. Gartner coined the term to describe the convergence of cloud security tools. CDR is typically the runtime detection component within a CNAPP. Not all CDR solutions are full CNAPPs, and not all CNAPPs have strong CDR.

CDR tools should send findings to the SOC's primary investigation platform (SIEM or AI SOC platform) for correlation with endpoint, identity, and network events. A cloud alert for unusual IAM activity is most useful when correlated with the user's authentication events (IdP) and endpoint behaviour (EDR). Pure cloud-only CDR that doesn't correlate with other telemetry creates investigation blind spots.

Key CDR response actions: (1) Revoke IAM credentials — immediately invalidate compromised API keys or role sessions; (2) Quarantine EC2 instance — apply restrictive security group to isolate compromised instance; (3) Disable IAM user — prevent further API access from compromised identity; (4) Enable CloudTrail — re-enable logging if disabled by attacker; (5) Snapshot EBS volumes — preserve forensic state before containment. Response actions in cloud environments should require human approval due to potential business impact.