FAR 52.204-21 and CMMC 2.0 Level 1 (control SI.L1-B.1.XIII) require basic cyber hygiene controls that include protecting endpoints from malicious code—this post shows small businesses how to select an EDR/AV solution and configure it to meet those obligations with practical, auditable steps.
Selecting an EDR/AV solution: practical criteria for Compliance Framework
When you evaluate products, focus on detection depth, response capabilities, management simplicity, and evidence generation. Detection depth means the product uses signatures plus behavioral/heuristic detection and can surface indicators mapped to frameworks such as MITRE ATT&CK. Response capabilities should include quarantine, process termination, endpoint isolation, and the ability to collect forensics artifacts (logs, dlls, memory dumps) for incident follow-up. Management simplicity means a centralized cloud or on-prem console with role-based access controls (RBAC), policy templates, and automated deployment. For compliance you also need clear reporting (agent install lists, detection/quarantine logs, and configuration settings exports) so auditors can verify coverage.
Technical features to prioritize and why they matter
Pick a solution that provides real-time on-access scanning, behavioral EDR (telemetry of processes, network connections, file changes), and tamper protection to stop users or malware from disabling protection. Ensure the agent runs with sufficient privilege (kernel or user-mode as appropriate) to capture events and that communication with the management console uses modern TLS (1.2+) with certificate validation. Other useful features: exploit mitigation (macro/script blocking, ASR rules), ransomware rollback or file protection, offline caching of signatures, and a lightweight footprint—important for small-business endpoints with limited CPU/memory resources.
Implementation notes specific to Compliance Framework
For FAR/CMMC evidence, document a written policy stating the requirement to run approved endpoint protection on all contractor-owned devices that handle Federal Contract Information (FCI). Maintain an authoritative inventory mapping each endpoint to its agent status, version, and last contact timestamp. Configure the product to auto-update signatures and agents, and record those updates in logs or reports. The goal is both to implement the controls and to be able to demonstrate they are active and monitored during an assessment.
Configuration checklist with specific settings and deployment steps
Concrete configuration items to implement: enable real-time protection and cloud-assisted analysis, enforce automatic signature/engine updates, set quarantine actions to "block and isolate" by default (not just notify), enable tamper protection, and turn on exploit/ASR rules (block Office macros from the internet, block credential-dumping tools, etc.). Use grouping/policy inheritance in the console to apply stricter settings to contract-facing systems. Deploy agents via your MDM/SCCM/Intune or the vendor's deployment tool, and run a pilot on 5–10% of endpoints to tune exclusions before enterprise-wide rollout. For Windows systems, consider enabling Sysmon or equivalent to supplement EDR telemetry if you need deeper logging for forensics.
Small business scenarios and real-world examples
Example 1: A 25-person engineering shop with MS 365 Business can use Microsoft Defender for Business (or Defender for Endpoints via upgrade) to meet basic protections: enroll devices in Intune, enable Defender settings via device configuration profiles, enforce tamper protection, and export the "device inventory" and "threat history" reports as audit artifacts. Example 2: A contractor with mixed Windows and Linux servers might deploy a cloud-managed EDR with cross-platform agents; deploy host isolation playbooks in the EDR console and integrate detection alerts into a cheap SIEM or log collector (e.g., an open-source collector or cloud logs) for central alerting—document the integration and save weekly evidence exports.
Monitoring, evidence generation, and handling exceptions
Monitoring is where compliance assessments succeed or fail. Establish daily alert triage processes for high-confidence detections and weekly reviews for lower-severity events. Generate and retain reports that show: (a) a full list of endpoints and agent versions, (b) policy profiles applied, (c) quarantine/detection logs for the prior 90 days (90 days is a reasonable recommended retention for Level 1 evidence), and (d) change control tickets for any exclusions. For exceptions (legacy app collisions or scanning exclusions), document the business justification, timeline, and compensating controls (network segmentation, host-based firewall rules) and include those documents in your compliance package.
Risks of non-implementation and why this matters
Failing to deploy and properly configure EDR/AV exposes FCI and your environment to malware, ransomware, and persistent intruders. Beyond the technical risk (data loss, downtime, lateral movement), non-compliance with FAR 52.204-21 can lead to contract penalties, loss of eligibility for future contracts, and reputational damage. From a practical standpoint, a single undetected infection on a contractor laptop can allow lateral pivoting into sensitive environments or leak FCI—so the cost of a minimal EDR deployment is typically far less than remediation or contract fallout.
Summary: To meet FAR 52.204-21 and CMMC 2.0 Level 1 (SI.L1-B.1.XIII) choose an EDR/AV that combines signature and behavioral detection, supports centralized management and reporting, and provides strong response options; configure it to auto-update, quarantine by default, enable tamper protection and exploit mitigation, and maintain clear audit artifacts (agent inventories, logs, and policy exports). Pilot before full deployment, tune to reduce false positives, document exceptions, and retain evidence—this practical approach keeps small businesses secure and audit-ready without excessive cost or complexity.
