--- title: "Managed SIEM — Sentinel, Splunk, Elastic | EFROS" description: "Managed SIEM across Microsoft Sentinel, Splunk, Elastic, and QRadar. Custom detection content, tuning, SOAR playbooks, and compliance-ready reporting." canonical: https://efros.com/security/managed-siem/ --- - [Home](https://efros.com/) - /[Security](https://efros.com/security/) - /Managed SIEM By [Stefan Efros](https://www.linkedin.com/in/stefanefros-cyberdefense/), CEO & Founder, EFROS Updated · July 25, 2026 Security / Managed SIEM # Managed SIEM, tuned and run for you. We operate SIEMs full-time. Microsoft Sentinel, Splunk, Elastic, or QRadar, whichever fits your environment. Custom detection content, SOAR playbooks, and tuning that keeps up with how fast threats change. ## What's included ### Log source integration On-prem, cloud, SaaS, identity, endpoint. Whatever generates logs, we pipe it in. Parser development, schema mapping, and source health monitoring all live on our side. ### Custom detection engineering Detection content tailored to your environment and your industry's threat profile. Everything gets mapped to MITRE ATT&CK, tested against known-good traffic before deployment, and version-controlled so you can see what changed. ### SOAR playbook automation Auto-enrichment, auto-containment where your policy allows it, and auto-ticketing for everything else. Our analysts spend their time on decisions, not copy-pasting IP addresses into lookup tools. ### Continuous tuning False-positive reduction cycles run weekly. Detection coverage reviews happen monthly. Retention and storage get optimized quarterly. If your environment changes, the content changes with it. ### Compliance reporting Pre-built dashboards and scheduled reports for SOC 2, PCI-DSS, HIPAA, ISO 27001, and NIST CSF. When auditors ask for evidence, we export it the same day. ### Licensing optimization SIEM ingest costs spiral if nobody watches them. We right-size data sources, filter verbose streams at the forwarder, and benchmark against industry peers. Most clients see ingest costs drop 20-40% in the first 90 days. ## Platforms we operate Microsoft Sentinel Cloud-native SIEM + SOAR with native Azure and M365 integration Splunk Enterprise Security Market-leading platform for complex, high-volume environments Elastic Security Open, scalable SIEM with flexible licensing and deployment IBM QRadar Enterprise SIEM with strong on-prem and hybrid footprint Wazuh Open-source SIEM for cost-sensitive and specialized use cases Sumo Logic / Chronicle Cloud-native platforms for log-heavy, SaaS-first environments ## Managed SIEM FAQ ### We already have a SIEM. Can EFROS take over operation? Yes. Most engagements start with assuming operation of an existing SIEM. We audit current configuration, log sources, detection coverage, and cost, then optimize in the first 30-60 days before introducing custom content. ### What if we don't have a SIEM yet? We recommend based on your environment (cloud mix, data volume, budget, compliance needs) and deploy end-to-end. Microsoft Sentinel is often the fastest path for M365-centric orgs; Elastic or Splunk for larger or hybrid environments. ### Who owns the detection content — EFROS or us? You do. All custom detection rules, playbooks, and tuning are documented in your environment and handed over on request. No vendor lock-in via opaque detection libraries. ### How do you handle SIEM cost optimization? We audit ingest volume, classify log sources by security value, and eliminate or summarize low-value data. Verbose sources (Windows event logs, cloud audit logs) are filtered at the forwarder. Typical reduction: 20-40% on ingest costs within 90 days. ### Who offers managed SIEM and 24/7 security monitoring in Chicago? EFROS delivers managed SIEM and 24/7 security monitoring across the Chicago metro and Chicagoland as a remote service-area business. We handle log aggregation, correlation, and continuous SOC monitoring on your platform, supporting Microsoft Sentinel, Splunk, Elastic, and QRadar. Our engagements are SOC 2-aligned and ISO 27001-aligned and back verified incidents with a contractual four-hour incident-response SLA. Related programs ## SIEM works best alongside [### Managed Detection & Response EDR + XDR + SOAR layered on top of SIEM. Detection content that fires through to active containment, not dashboards.Open→](https://efros.com/security/mdr/) [### 24/7 SOC as a Service Analysts who actually triage the alerts the SIEM produces, with the escalation SLA in writing.Open→](https://efros.com/security/soc-as-a-service/) [### Virtual CISO Strategic oversight of detection coverage, compliance mapping, and board-grade quarterly reporting.Open→](https://efros.com/security/vciso/) [### Incident Response Retainer Pre-engaged IR commander for when a SIEM detection turns into a real incident.Open→](https://efros.com/security/incident-response/) [### MSSP TCO Calculator 3-year build-vs-buy comparison: in-house SIEM operations against managed MDR with full math.Open→](https://efros.com/tools/mssp-tco-calculator/) [### Free Security Scan 60-second external scan of your domain (DNS, email auth, TLS, headers) before you scope SIEM ingest.Open→](https://efros.com/tools/security-scan/) ## SIEM spend out of control? Free assessment. We look at your ingest volume, detection coverage, and current spend, then benchmark against comparable companies. You leave with a clear picture of what's worth keeping and what's costing you money. [Run Free Security Score](https://efros.com/contact/) Related EFROS resources ## SIEM operations stack [### MDR — SIEM with response 24/7 SOC operating the SIEM with pre-authorized containment.Open→](https://efros.com/security/mdr/) [### SOC as a Service Tier 1-3 monitoring on top of the managed SIEM.Open→](https://efros.com/security/soc-as-a-service/) [### vCISO defines SIEM scope Named operator decides what gets logged and what gets alerted on.Open→](https://efros.com/security/vciso/) [### M365 + Microsoft Sentinel Native M365 telemetry into Sentinel for unified SIEM.Open→](https://efros.com/security/microsoft-365/) [### Zero Trust telemetry Identity + device + network signals that feed SIEM detections.Open→](https://efros.com/security/zero-trust/) [### SIEM for SOC 2 CC7 Logging + monitoring evidence aligned to Trust Services Criteria.Open→](https://efros.com/resources/soc-2-readiness-checklist/)