Managed Cybersecurity Services

Attackers keep coming through the same three doors: a stolen password, a convincing email, an unpatched machine nobody was watching. NetSys closes those paths and watches everything else with 24/7 monitoring, endpoint detection and response, immutable backups and training that changes what your staff clicks. Every NetSys client hit by ransomware has fully recovered. Engineers work on-site from our Brooklyn office across New York City, Long Island, Westchester, the Hudson Valley, North Jersey and Fairfield County, CT.

See the External Test Scope

The short answer

Managed cybersecurity services combine protective tools with people responsible for running them. NetSys scopes endpoint detection, identity and email protection, network controls, recovery and staff training, either alongside your IT team or within a managed IT agreement. The starting point is a coverage review: what is protected, who acts on an alert and which gaps require a separate assessment or implementation project.

Cybersecurity support matched to your business risks

NetSys has been defending business networks from the Brooklyn office at 1 Prospect Park SW since 1998, and most of that work is now identity work. Microsoft Defender for Endpoint runs on every workstation and server with its policies pushed from Intune. Entra ID Conditional Access decides which sign-ins are allowed and blocks the legacy authentication paths a default Microsoft 365 tenant leaves open. Purview data loss prevention watches the files that would hurt to lose. Privileged access is handled through PAM and PIM, so nobody carries standing administrator rights for something they need twice a year. Backups are offline and immutable, and we restore from them on a scheduled date and record what came back and how long it took.

The free assessment is a remote external penetration test, limited to the information available to NetSys and the external scope we agree with you. The report is yours whether or not you hire us. Tier 2, which reads your source code inside an isolated sandbox, is quoted separately. Joel Baum leads the security and compliance side of the practice, every client gets a named account manager with a real cell number, and agreements run month to month.

A Comprehensive, Proactive Approach to Security

Attackers rarely break anything. They log in. The paths we see against small businesses in New York are business email compromise after a mailbox is taken over, OAuth consent phishing where a user approves a malicious app against their own Microsoft 365 tenant, Direct Send abuse that lets an outsider drop mail into your domain without authenticating, callback phishing that carries a phone number instead of a link so the mail filter has nothing to score, MFA fatigue push spam, and unpatched edge devices such as SonicWall VPN firmware. Each one has a specific control behind it: Conditional Access policies in Entra ID, app consent policies with admin review of third-party apps, Direct Send turned off so submission has to be authenticated, Defender for Office 365 plus training on the phone-number pattern, number matching on approvals, and a firewall and VPN patch cadence that is tracked rather than assumed. Monitoring runs 24/7 behind all of it, and offline immutable backups with dated restore tests sit behind that.

Our Cybersecurity Services

Network Security

A firewall is only as current as its last firmware update, which is how unpatched SonicWall VPN appliances turned into a ransomware entry point for businesses that thought the edge was handled. We keep edge devices on a tracked patch schedule, segment the flat networks that let one infected laptop reach the file server, and put remote access behind Entra ID Conditional Access rather than a shared VPN password.

Next-generation firewall deployment and management
Secure VPN and remote access configurations
Network segmentation and traffic control
Secure Wi-Fi implementation and authentication
Regular firmware and security updates

Endpoint & Server Protection

The endpoint is where a phishing click stops being an email and becomes a foothold. Every workstation and server runs Microsoft Defender for Endpoint with its policies and compliance rules pushed from Intune, patching follows a schedule we track instead of a reminder the user dismisses, and local administrator rights come off the day-to-day account so malware inherits a limited user instead of the whole machine.

Managed antivirus and advanced endpoint detection & response (EDR)
Patch and update management
Application control and device restrictions
System hardening for servers and critical infrastructure

24/7 Monitoring & Threat Response

Monitoring runs around the clock against signals that mean something: a Defender for Endpoint alert on a machine, an Entra ID sign-in from a country your staff does not work in or over legacy authentication, a new inbox rule quietly forwarding mail outside the company, an OAuth app consent nobody asked for. When one trips we isolate the device and kill the session rather than sending you an email about it, and your named account manager gives you a cell number that works at 2am.

Continuous system and security log monitoring
Real-time alerts for suspicious activity
Incident investigation and triage
Rapid response and remediation recommendations

Cloud Security & Secure Remote Work

A default Microsoft 365 tenant is not a secured one. Hardening it means Conditional Access in Entra ID that blocks legacy authentication and unmanaged devices, Intune compliance policies on the laptops that reach SharePoint and OneDrive, Purview data loss prevention so a client file cannot walk out through a personal account, and a review of which third-party apps your users have already consented to inside the tenant.

Secure configuration of cloud services
Identity and access management (MFA, role-based access)
Hardened remote access solutions (VPN, Zero-Trust principles)
Protection for remote devices and home networks

Ransomware Defense & Data Protection

NetSys has worked more than 30 ransomware incidents in the last three years and recovered every one. The clients who had a disaster recovery plan already written and tested were running again inside 24 hours. Without one, the same decisions get made during the incident instead of before it, and that is where the days go. The defense that matters here is a backup you have proven: offline and immutable copies, restores run on a scheduled date, and the restore time written down so nobody is estimating it while the office is down.

Anti-phishing and email threat protection
Behavioral ransomware detection
Industry-standard backup and disaster recovery solutions
Offline and immutable backup options
Tested recovery procedures

Security Policies, Compliance & Employee Training

Training is about what is being sent to your staff this month: callback phishing that asks them to call a number about a renewal they never bought, an OAuth consent screen dressed as a Microsoft sign-in, a wire-change request from a mailbox that really does belong to your CFO. Policy work follows the rule you are graded on, whether that is HIPAA for a medical practice, the FTC Safeguards Rule for a firm holding consumer financial data, NYDFS 23 NYCRR 500 for a licensed New York business, or CMMC 2.0 for a defense supplier. Karla Gilvergara leads the AI tools and AI fraud awareness training.

Creation and refinement of security policies
Compliance guidance based on your industry
Employee cybersecurity awareness training
Best practices for safe remote work and data handling

How a Security Engagement Starts

No two environments are the same, so we look before we prescribe.

Free remote external test with available-information and scope limitations stated
Review of identity, email, endpoints, network, and backups as they exist today
A prioritized fix list separating quick wins from projects that need budget
A written split of what we run and what stays with your team
Agents deployed and alert contacts agreed before go-live, including what we may contain without waiting for a callback
Month-to-month terms, so there is nothing long-term to sign before you see the work

Where We Defend Businesses

Monitoring runs remotely around the clock; engineers come to you across our on-site regions.

Headquarters: 1 Prospect Park SW, Suite 6E, Brooklyn, NY 11215
On-site: New York City, Long Island and Westchester County
On-site: the Hudson Valley, North Jersey and Fairfield County, CT
Remote-first everywhere else: visits arranged in advance and scoped in the proposal
24/7 remote monitoring and response wherever your systems run

Why NetSys

Why Businesses Choose The NetSys Group

Fifteen minutes with a NetSys engineer, not a salesperson, and you will know where your cyber security stands and what it would take to fix it. Call 845-203-3914 or request a call to discuss the scope and next steps.

Who does the work: meet the NetSys team on our About page.

One month-to-month agreement covers the whole stack: managed help desk, cybersecurity, PAM, PIM, disaster recovery planning, and AI adoption. Security is not a higher tier you get upsold into later.
Named controls, deployed by default: Microsoft Defender for Endpoint on every workstation and server, Entra ID Conditional Access on every sign-in, Purview data loss prevention on the files that matter, and offline immutable backups with restores tested on a date we can show you.
Joel Baum leads the security and compliance practice and Latoya Reed handles the Microsoft 365 and Entra ID work. Every client also gets a named account manager who hands over a real cell number for escalation.
Controls mapped to whichever rule you are audited against: HIPAA, PCI DSS, SOC 2, CMMC 2.0, NIST CSF, NYDFS 23 NYCRR 500, the NY SHIELD Act, the FTC Safeguards Rule, GLBA, or SEC Reg S-P.
Email and identity get the attention the attacks do: Defender for Office 365 in front of the mailbox, Microsoft 365 Direct Send switched off, an alert on any new rule that forwards mail outside the company, and admin review before a user can consent to a third-party app in your tenant.
Privileged access is treated as its own job: PAM to strip standing local administrator rights, PIM so an Entra ID admin role is granted for a set window and then taken back, and a documented break-glass account that gets tested rather than assumed.
A 100% ransomware recovery record: every NetSys client hit has fully recovered
98% client retention across 28+ years in business
Engineers on-site across NYC, Long Island, Westchester, the Hudson Valley, North Jersey and Fairfield County, CT
Month to month, like every NetSys agreement, with no long-term contract
See the work before you buy it: the external penetration test is free and the findings are yours to keep

From our published case studies

Multi-Site Medical Practice

Seven locations, aging servers, and HIPAA on the line. New infrastructure, secure interconnectivity, and tested recovery brought the practice to a clean audit.

Read the case study

From our client work

Cyber Security in practice

Insurance
Regional title insurance company
Barracuda email protection for 85 users, phishing simulations, employee security training, and MFA deployment.
Security Awareness & Phishing Training IT for Insurance Agencies and Brokers
Wealth management
RIA firm
Barracuda email protection for 117 licensed users, email archiving, cybersecurity monitoring, and account access management.
Cybersecurity for Financial Services IT for RIAs and Wealth Management
Healthcare
Home healthcare agency
Mobile device protection for 73 phones and tablets, secure email access, and remote removal of company data from lost devices.
Mobile Device Management IT for Healthcare

Client names are withheld. Each card is the scope of a real NetSys engagement, as delivered.

When something is wrong, this is the clock

Security incidents are response-time problems. The same written commitments that cover our managed IT clients apply when the call is a security call:

Severity	Phone response	Remote response	On-site response
Critical: you're down, or actively at risk	10 minutes	30 minutes	As fast as 1 hour, per agreement
Standard: something's broken, work continues	30 minutes	1 hour	Up to 6 hours, per agreement

On-site times depend on where you are and the on-site tier written into your agreement. We put the numbers in writing instead of implying them. And there is no ticket queue in front of any of this: you call, a NetSys engineer answers. The help desk is staffed seven days a week from 4 a.m. to 11 p.m. Eastern time, and emergency service is available 24/7.

Security coverage needs an owner at every layer

Use the coverage review to identify both the technical control and the person who can act.

Layer	Operating responsibility	Client decision or evidence
Endpoints	Sensor health, alert triage and agreed containment	Supported device inventory and isolation authority
Identity	Sign-in policy, privileged access and account lifecycle	Role owners, exceptions and emergency access approval
Email	Filtering, authentication and investigation within scope	Legitimate senders and approval of disruptive changes
Network	Firewall configuration, updates and monitoring	Sites, permitted connections and maintenance windows
Recovery	Backup checks and scoped restore exercises	Business recovery order and acceptance owner
People	Training, reporting channels and follow-up	Staff participation and escalation contacts

From the first review to ongoing operation

Each step answers a different question.

Step	Decision	What you receive
Assess	Where is the exposure and how broad should the review be?	An agreed test or assessment scope and prioritized findings
Implement	Which gaps will be fixed, by whom and when?	A change plan, approvals and verification of the changes
Operate	Who watches the controls and handles exceptions?	Named responsibilities, reporting and escalation in the agreement

Assessment options · External penetration test scope.

The free external penetration test has an agreed external scope. It does not establish coverage of every internal device, cloud account or business process.

Read recovery evidence in its original context

The published restaurant-group recovery case describes a particular environment and incident. Its measured recovery is evidence of that engagement, not a recovery-time guarantee for another business.

Review the affected workload, the recovery method and the result described in the case.
Compare those dependencies with your own applications, backups and available access.
Set your recovery targets in writing and test your own plan before relying on it.

Read the published ransomware recovery case.

The managed security stack, layer by layer

What runs in a NetSys security agreement, and the attack each layer is there to stop:

Layer	What we run	What it stops
Endpoint detection (EDR)	ThreatDown EDR or Microsoft Defender on every covered workstation and server	Malware and ransomware that antivirus alone misses
Managed detection and response (MDR)	NetSys engineers triage each Defender alert and can isolate a compromised machine	An alert nobody reads until Monday
SOC monitoring	Sign-in, email, firewall and server logs collected and correlated, scoped per business	An attack that shows only across several systems at once
Email security	Defender for Office 365, Direct Send switched off, and alerts on rules forwarding mail outside the company	Phishing, spoofed internal mail and a quietly hijacked mailbox
Identity	MFA and Conditional Access on every sign-in, with PAM and PIM for admin rights	A stolen password turning into admin control
Backup and recovery	Offline, immutable backups restored on a dated schedule	Ransomware becoming a permanent loss
Security awareness training	Monthly phishing simulations, with a short lesson for anyone who clicks	The lure that gets past every filter

Weighing the detection layers against each other? EDR vs XDR vs MDR for a small business · SIEM vs EDR vs MDR: what each one watches.

Response commitments for security calls are the severity table on this page. SOC log monitoring is scoped separately from endpoint MDR.

Where we deliver Cyber Security

Cyber Security in Brooklyn, NY · Cyber Security in Stamford, CT · Cyber Security in Greenwich, CT · Cyber Security in White Plains, NY · Cyber Security in Palo Alto, CA · Cyber Security in Tampa Bay · Cyber Security in Westport, CT. We also support clients remotely wherever their systems run. See all locations and service areas.

Cyber Security by market

NYC Metro: New York City · Brooklyn, NY · Manhattan

Long Island: Nassau County, NY · Suffolk County, NY · Long Island

Hudson Valley: Westchester County, NY

Connecticut: Stamford, CT · Connecticut

New Jersey: New Jersey

Pennsylvania: Philadelphia

New England: Boston · Massachusetts

National metro: Palo Alto · Chicago · Houston · Atlanta · Los Angeles · Dallas · Charlotte · Denver · San Diego · Austin · San Antonio

Florida (other): Tampa · Florida

Mid-Atlantic: Maryland · Virginia

Statewide: California

Common Questions

Cyber Security FAQs

Can we buy a security review before ongoing management?

Yes. Scope the assessment around the question you need answered, then decide whether you want implementation help, ongoing operation or both. Findings do not automatically change your support contract, and a tool license alone does not establish who investigates its alerts.

How fast do you respond to a security incident?

Monitoring and emergency service run 24/7, and the help desk is staffed seven days a week, 4 a.m. to 11 p.m. Eastern. The phone, remote and on-site response times we commit to in writing, by severity, are in the table on this page. Before go-live we agree who may isolate a device, disable an account and approve a restore without waiting for a callback, and who we call after hours. Your named account manager is the direct escalation route.

What happens if we're hit with ransomware?

Every NetSys client hit by ransomware has fully recovered: a 100% record. We restore from offline, immutable backups using recovery procedures we test on a schedule, then close the entry point that let the attack in.

Do you work with our existing IT staff?

Yes. We can act as your complete security team or layer 24/7 monitoring, endpoint detection, and incident response on top of your internal IT, whichever split fits your organization.

Is the external penetration test really free?

Yes. The free assessment is a remote external penetration test, limited to the information available to NetSys and the external scope we agree with you. Internal reviews, onsite work and any broader assessment are scoped separately.

Do you provide cybersecurity services in New York City?

Yes. Our office is at 1 Prospect Park SW in Brooklyn, so on-site work across the five boroughs is routine scheduling rather than a special trip. Monitoring and response run 24/7 remotely; engineers come to you for remediation and network work, and the free external penetration test runs remotely before you hire us.

Do you cover Westchester County and Fairfield County, Connecticut?

Yes. Both sit inside our on-site coverage, which is New York City, Long Island, Westchester, the Hudson Valley, North Jersey and Fairfield County, CT. Our main line, 845-203-3914, is a Hudson Valley number. To be plain about it: we have one office, in Brooklyn. The rest of that list is coverage territory we actually drive, and we don't claim satellites we don't have.

What's the difference between managed IT and managed cybersecurity?

Managed IT keeps things working: help desk, patching, hardware, email and backups. Managed cybersecurity keeps things defended: 24/7 monitoring, endpoint detection and response, identity and access controls, email threat protection and incident response. We build security into every managed IT agreement rather than selling it back to you as an upgrade. You can also buy the security layer on its own if another provider handles your day-to-day IT.

We're on Microsoft 365 and it has security built in. Isn't that enough?

Microsoft 365 includes security capabilities, but their availability and protection depend on licensing, configuration and ongoing administration. We review MFA, sign-in policies, privileged access, email protection and device compliance against your actual tenant. Retention and recovery settings also need review: a written backup and restore plan should specify what is protected, for how long and who can restore it.

What should we do first if we think we've already been breached?

Call 845-203-3914 and stop using the affected accounts. Don't delete anything, don't wipe the machine, and don't pay anyone. We isolate affected devices, establish how the attacker got in and what they could reach, restore from offline immutable backups using recovery procedures we test on a schedule, and close the entry point before anything comes back online. Every NetSys client hit by ransomware has fully recovered.

What are cybersecurity services?

Cybersecurity services are the work of protecting a business's accounts, devices, email and data. They include assessments and penetration tests that find weaknesses, the controls and monitoring that close and watch them, and a plan for incidents. Managed cybersecurity runs those controls every day instead of handing over a one-time report.

Is managed cybersecurity the same as cybersecurity consulting?

No. Cybersecurity consulting is a scoped project: an assessment against a framework, a ranked roadmap and written policies, with the fixes carried out by your team or ours. Managed cybersecurity is the daily work of running and watching those controls under a monthly agreement. You can start with the free external test or a consulting project and move into managed coverage once the roadmap is agreed.

Does NetSys provide managed security, or only IT support?

Both. NetSys is a managed IT and cybersecurity company, and its managed security runs under the same month-to-month agreement: ThreatDown MDR, Microsoft Defender, email filtering, MFA and Conditional Access, and backups with tested restores. The 24/7 security operations center (SOC) is part of the ThreatDown MDR service. Log-based SOC monitoring across sign-ins, firewalls and servers is scoped separately, and businesses that keep their own IT provider can buy the security layer alone through our MSSP service.

What should a small business look for in a cybersecurity company?

A small business should look for a cybersecurity company that watches alerts around the clock and has agreed authority to isolate a compromised device. Then check, in writing: whether EDR, MFA, email filtering and backups are in the base price or sold as add-ons; dated restore-test results; a named contact with response commitments by severity; contract length and exit terms; and whether they will test your defenses before you sign, as our free external penetration test does.

How much do managed cybersecurity services cost?

Managed cybersecurity is billed monthly, usually as one fee per user that covers that person's devices and the security tools on them. What moves the fee: how many layers you need (endpoint detection, email security, SOC log monitoring, training), servers and sites, compliance obligations, the Microsoft licenses you already own (Microsoft 365 Business Premium includes Defender for Business) and whether we also run your IT. NetSys publishes no rate card; our cost guide cites published market ranges.

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Find the unowned parts of your security coverage.

Bring your tools, device and tenant inventory, current provider responsibilities and any insurer or customer requirements. We will map the gaps and the next step.

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