Security Hardening + Anti-Malware Playbook

Purpose: ship an enterprise-grade yet user-friendly security posture (AV, EDR, malware defense, supply-chain controls, and a self-hosted coding platform) using modern, actively maintained open-source tooling wherever possible.

Objectives

Exceed current industry baselines (PQC-ready crypto, memory protection, behavior/rule-based detection).
Stay evergreen: prioritize projects with active releases and broad community adoption.
Offer flex modes: sensible defaults for normal users, opt-in stricter controls for regulated workloads.

Tiered Profile

Baseline (everyone): always-on AV/EDR, auto-updates, DNS filtering, disk encryption, secure boot.
High Assurance: baseline + kernel/eBPF runtime rules, device control, application allow/deny, strict USB, VPN-only network.
Isolation Mode: ephemeral workspaces, microVM/container sandbox (gVisor/Kata), no host persistence, outbound egress allow-list.

Endpoint Protection Stack

Windows: Microsoft Defender with ASR rules, SmartScreen, Controlled Folder Access; enable tamper protection and cloud-delivered protection. Optional: WDAC/SR for allowlisting; Sysmon + Wazuh for log shipping.
macOS: Built-in XProtect + MRT; add Santa (binary allow/deny), LuLu (egress firewall); Full Disk Access only for vetted agents.
Linux: ClamAV (real-time + FreshClam updates), YARA rules for targeted sweeps, Falco (eBPF runtime detection), osquery for inventory, AppArmor/SELinux enforced profiles.
Cross-platform EDR/NDR (open-source first): Wazuh or CrowdSec for SIEM/behavior scoring; Zeek or Suricata for network telemetry/IDS; DNS sinkhole via AdGuard Home or Pi-hole.
Quarantine/response: isolate process, snapshot indicators (hashes, paths, IPs), auto-create YARA rule, and open a ticket. Provide a one-click “resume” for false positives.

Supply Chain + CI/CD Security

SCA + SBOM: syft -> grype (or trivy) for images and deps; block known CVEs; publish SBOM in CI artifacts.
Static analysis: semgrep, bandit (Python), npm audit/pnpm audit, pip-audit, cargo audit; optional codeql for deeper runs.
Secrets: gitleaks in pre-commit and CI; block pushes with secrets.
Container/base images: distroless or minimal images; sign images with cosign; enforce verified provenance (SLSA-style).
Runtime: sandbox with gVisor or Kata Containers; enable seccomp/apparmor profiles and read-only rootfs where possible.

Self-Hosted Coding Platform (for SCBE + users)

Platform: self-host Coder or Gitpod Self-Hosted (or code-server behind zero-trust), backed by devcontainers or Nix flakes. Ephemeral workspaces by default; persistence only for vetted volumes.
Security guardrails:
- Workspace policy: signed base images, non-root user, read-only rootfs, egress allow-lists for prod tenants.
- Pre-baked tooling: semgrep, trivy, syft/grype, gitleaks, ruff/flake8/black, npm/yarn/pnpm audit, pytest.
- Pre-commit enforced locally and in CI; branch protection requires green security checks.
- Optional auto-patching bot: weekly PRs for deps; nightly CVE sweeps with grype/trivy.
Isolation: run workspaces inside gVisor/Kata or Firecracker-based microVMs; terminate idle sessions; wipe ephemeral storage on stop.

Update + Patch Cadence

Signatures/rules: FreshClam hourly; YARA/Falco rules nightly; Suricata/Zeek rulepacks weekly.
OS/app updates: monthly patch windows; emergency fast-track (<24h) for critical CVEs.
Tooling currency: pin to released versions, rotate every quarter; retire EOL tools immediately.

Operational Runbook (condensed)

Deploy agents per OS (Defender/Santa/ClamAV+Falco+osquery), enroll in Wazuh/CrowdSec.
Enable CI gates: SBOM + vuln scan, SAST, secrets, signature verification; fail build on high severity.
Provision coding platform: launch Coder/Gitpod cluster with signed images, sandboxed runtimes, and pre-commit hooks.
Monitor & respond: forward logs to SIEM; auto-quarantine malicious artifacts; ticket with IOCs; allow override with approval + justification.
Test continuously: run weekly EICAR+GTUBE-style benign test, and quarterly tabletop for incident response.

Quick Tool Reference (evergreen, open-source biased)

AV/EDR: ClamAV, YARA, Falco, osquery, Wazuh, CrowdSec.
IDS/NDR/DNS: Zeek, Suricata, AdGuard Home/Pi-hole.
Supply chain: syft, grype, trivy, cosign, SLSA provenance tools.
SAST/secrets: semgrep, bandit, ruff/flake8, gitleaks, npm/pnpm audit, pip-audit, cargo audit, codeql (optional).
Sandbox/Isolation: gVisor, Kata Containers, Firecracker (via providers), AppArmor/SELinux.
Dev platform: Coder, Gitpod Self-Hosted, code-server with devcontainers/Nix.