Cybersecurity · New York City

Cyber Security NYC: Managed Detection, Identity Protection and Tested Backups

NetSys provides cybersecurity services in New York City: managed detection and response, Microsoft 365 identity and email protection, staff training and tested backups. Our Brooklyn team scopes the systems, response responsibilities and on-site work you need, with month-to-month terms.

All IT services in New York City

The short answer

NetSys delivers managed cybersecurity to businesses in Manhattan, Brooklyn, Queens, the Bronx and Staten Island. The service covers 24/7 monitoring, managed detection and response (MDR and EDR) on every device, multifactor authentication and Conditional Access across Microsoft 365, email and phishing protection, security awareness training, privileged access and privileged identity management for admin accounts, and immutable backups with restores we test. The free offer is a remote external penetration test, limited to the information available to NetSys and the external scope agreed with you. New York City is on-site territory for us: our only office is at 1 Prospect Park SW in Brooklyn, so engineer visits anywhere in the five boroughs are routine scheduling. Every agreement is month to month, and your account manager answers a real cell number.

Service information by The NetSys Group. Our editorial standards.

What attackers go after in New York City

The city's business mix is dense with targets that pay: law firms holding escrow and closing funds, accounting practices with client tax data, medical groups with patient records, importers and distributors settling supplier invoices by wire, and financial firms answering to the SEC or the Department of Financial Services. The attacks that land here are rarely exotic. A stolen Microsoft 365 password, a forged invoice from a supplier's compromised mailbox, a phishing page that captures a session token and walks straight past the multifactor prompt. Behind that sits pressure from every direction: the SHIELD Act's reasonable-safeguards requirement for anyone holding New Yorkers' private information, NYDFS Part 500 for licensed financial businesses, HIPAA for healthcare, and cyber insurers who now decline renewals without endpoint detection, multifactor authentication and offline backups in place.

How cybersecurity services are delivered in New York City

Monitoring is remote and continuous. Our systems watch endpoints, identities, email and network logs around the clock, and an engineer acts on an alert rather than forwarding it to you. The physical work happens at your office: a firewall replacement, a walkthrough of a new floor before move-in, isolating a compromised machine, rebuilding a network closet in a multi-tenant building. Because the company is headquartered in Brooklyn, on-site work in Manhattan, Queens, the Bronx or Staten Island is a scheduled trip rather than a premium service. The free offer is a remote external penetration test, limited to the information available to NetSys and the external scope agreed with you. Reviews of Microsoft 365 tenant settings, devices, internal networks, backups or compliance evidence require a separate scope. You get a prioritized fix list, a written split of what we run and what stays with your team, and month-to-month terms.

Who cybersecurity services in NYC fit

Businesses with enough people, money movement or regulated data that a breach would hurt, and no security team of their own: professional practices in Midtown and Downtown, healthcare groups across the boroughs, importers near the ports, nonprofits holding donor data, and agencies with client credentials sitting in shared drives. Companies with an internal IT person fit too. In that case we supply the monitoring, the security stack and the after-hours coverage behind them, and they keep their projects. If a break-fix relationship has stopped being enough, or you are between providers, the free external test is the honest place to start. It examines available information within the external scope agreed with you; its findings do not describe internal controls.

How to choose a cybersecurity company in New York City

Judge a cybersecurity company by what it can show working, not by the products it names. Ask who reads an alert at 2 a.m. and what that person is allowed to do: isolate a laptop, disable an account, call you. Ask for evidence that multifactor authentication and endpoint detection cover every account and device, including laptops at home, and for the date and result of the last restore test. Check whether the firm can document controls against the rules you answer to, from the SHIELD Act to NYDFS Part 500 or HIPAA, in a form an auditor or insurer accepts. Find out whether an engineer can reach your office in your borough when a device has to be pulled or a network closet rebuilt, and who does the work: the people you meet or a subcontractor. Then read the term, the exit clause and what the base price leaves out before you sign.

What is included

Cybersecurity in New York City: what NetSys delivers

Detection and response

24/7 monitoring of endpoints, identities, email and network logs, with a person acting on alerts
Managed detection and response with EDR agents on every workstation, laptop and server
Real-time isolation of a compromised device, with an engineer on the case rather than a ticket in a queue
Incident investigation, root-cause work and a written timeline for leadership, counsel and your insurer

Identity and access

Multifactor authentication and Conditional Access across Microsoft 365 and Entra ID
Legacy authentication switched off, dormant accounts closed, forwarding rules and consent grants reviewed
Privileged access management for administrator accounts
Privileged identity management so admin rights are granted just in time and removed afterwards
Phishing-resistant sign-in options for finance staff and partners where the risk warrants it

Email, people and training

Email and phishing protection in front of every mailbox, with SPF, DKIM and DMARC set correctly
DNS filtering on office and remote devices
Security awareness training with simulated phishing aimed at the lures NYC firms receive
Wire-transfer and vendor-change verification procedures written for your finance staff

Backups and testing

Immutable backups that ransomware cannot alter or delete
Restores tested on a schedule and documented, so the recovery time is known rather than guessed
Free remote external penetration test limited to available information and agreed external scope; findings state the scope and limitations
Tier 2 source code penetration testing in an isolated sandbox, quoted per codebase

Illustrative engagement

A Midtown law firm with escrow accounts and a tenant nobody hardened

This planning example shows how we could scope the work. It is not a claim about a customer in this market or a measured result. For published customer work, see our case studies.

Two partners, a dozen staff, a Microsoft 365 tenant set up years ago by a former office manager, and antivirus that came bundled with the laptops. Closing funds move by wire every week. A client recently received an email from the firm's domain with altered payment instructions, and nobody can say whether a mailbox was compromised or the sender was spoofed. The firm's cyber insurer has asked for evidence of multifactor authentication and endpoint detection before renewal.

Free remote external penetration test limited to information available to NetSys and the external scope agreed with the business; any internal investigation or remediation below is scoped separately
Mailbox investigation: sign-in logs, forwarding rules and consent grants reviewed to confirm whether the tenant was breached, then every account moved to multifactor authentication with Conditional Access
Managed detection and response deployed to every laptop, including the ones the partners use from home
Email authentication configured with SPF and DKIM alignment, DMARC reporting and staged enforcement to reduce unauthorized use of the firm's domain, phishing protection placed ahead of the mailboxes, and a callback rule adopted for any change in wire instructions
Immutable backups for the document management system and Microsoft 365, with a restore tested and the result written down for the insurer

The firm answers the insurer's questions with evidence instead of assurances, wire instructions have a verification step that does not depend on anyone's memory, and an engineer is watching the tenant at night. The partners get one person to call. The agreement stays month to month.

Published case study

Firewall, antivirus and maintenance for a five-person office

A five-person office needed the basics done properly rather than an enterprise stack. NetSys replaced the internet provider's router with a business-grade firewall configured with sensible rules, secure remote access and logging, deployed managed antivirus on every machine with updates and alerts handled centrally, and put patching, backup checks and health reviews on a schedule. The agreement covers what the office needs and nothing it does not, month to month. No outcome figures were measured for publication.

Read the full case study (5-person office)

From our client work

Cybersecurity work for other clients

Construction and trades
Commercial electrical contractor
MFA rollout for 50 employees, secure mobile access to project files, and Microsoft 365 account management.
Multi-Factor Authentication Deployment IT for Construction
Healthcare
Outpatient mental health practice
Support for 32 clinician workstations, secure telehealth access, patient record backups, and phishing protection.
IT Support IT for Healthcare
Real estate
Residential real estate brokerage with four offices
Email protection for 64 agents, secure transaction document sharing, mobile access, and Microsoft 365 administration.
Microsoft 365 Security Hardening IT for Real Estate and Property Management

Client names are withheld. These examples were chosen for the work involved, not for where the client is, so none is presented as a New York City client.

Compliance in New York City: the SHIELD Act and what sits on top of it

The New York SHIELD Act (General Business Law § 899-bb) requires reasonable administrative, technical and physical safeguards for covered private information. The small-business standard considers the size and complexity of the business and the sensitivity of the information; it is not a general small-business exemption. The service scope should identify the records, access controls, retention settings and incident evidence your business needs; your legal or compliance adviser determines which requirements apply. The security service is built to produce the evidence those rules ask for: multifactor authentication and Conditional Access reports, endpoint detection coverage, vulnerability scan results, backup restore records and a tested incident response plan. Discovery identifies missing records and assigns the documentation work. Applicable duties depend on the business, data, exemptions and contracts; your legal or compliance adviser determines which requirements apply.

Primary sources

New York Attorney General: SHIELD Act

What cybersecurity costs in New York City

Cybersecurity is priced per user per month when it runs as an ongoing service, and per project for an assessment or a remediation. What moves the number: how many devices and identities are in scope, how much incident remediation and recovery is needed beyond the monitoring and authorized MDR actions in scope, which compliance standard the evidence has to satisfy, and whether the Microsoft 365 tenant is already on Business Premium or the security tooling comes from us. The free external penetration test costs nothing and runs remotely before any of that. Our managed IT pricing page explains how the fee is built.

How the monthly fee is built

Who this fits, and who it does not

Best fit: businesses with enough people, money movement or regulated data that a breach would hurt, and no security team of their own: professional practices, healthcare groups, importers, financial firms, nonprofits and agencies holding client credentials. Companies with an internal IT person fit as a co-managed arrangement.

Not a fit: organizations that want a security product installed and left alone. The service is monitored, reviewed and reported monthly, and it changes the way administrators, finance staff and vendors work. If that is not wanted, a tool purchase serves better than an engagement.

Cybersecurity in New York City: FAQs

Is NetSys a cybersecurity company in New York City?

Yes. The NetSys Group is a managed IT and cybersecurity company that protects businesses across all five boroughs from its only office, at 1 Prospect Park SW in Brooklyn, and it has run IT out of New York since 1998. The service includes 24/7 monitoring, managed detection and response on every device, multifactor authentication and Conditional Access, email and phishing protection, staff training, privileged access management and immutable backups with tested restores, inside a managed agreement or on its own. Engineers come on site anywhere in New York City for the work that needs hands, and every agreement runs month to month.

Is cybersecurity in New York City handled remotely or on site?

Both. Our only office is in Brooklyn, which puts every borough inside a normal day's scheduling. Engineers come to your office for firewall and network work, device isolation during an incident, security walkthroughs before a move, and the discovery session that opens a managed relationship. Monitoring, detection and response run remotely around the clock, so the on-site visits are for the tasks that need a person in the room.

What do cybersecurity services in NYC include, and how are they priced?

The service covers 24/7 monitoring, managed detection and response on every device, identity and access controls, email and phishing protection, staff training and immutable backups with tested restores. Pricing is built per business, from the number of users, the servers and cloud services in place, what already exists versus what has to be built, and how much on-site work the office realistically needs. Cybersecurity is part of a NetSys managed agreement rather than an upgrade sold separately, and the agreement is month to month, so the price has to keep being worth paying. You can request the free remote external penetration test within agreed external scope; a broader assessment and any remediation are scoped separately.

What does the free external penetration test include?

The free offer is a remote external penetration test, limited to the information available to NetSys and the external scope agreed with you. It is not an on-site visit or a full internal audit. Reviews of Microsoft 365 tenant settings, devices, internal networks, backups or compliance evidence require a separate scope. The findings state what was assessed and the limits of that assessment.

We are a small firm in Manhattan. Are we really a target?

Yes, because attackers choose by opportunity rather than by size. A small firm with a mailbox that authorizes wires, or a practice with patient records and one shared login, is easier to hit than a bank and still pays. Most compromises we see in the city begin with a phished password or a forged invoice, neither of which cares how many people you employ. The free remote external test examines available information within the agreed scope. It is a starting point for discussing findings, not a complete internal security review.

What is the difference between managed IT and cybersecurity services?

Managed IT keeps systems working: the help desk, patching, hardware, email and backups. Cybersecurity keeps them defended: 24/7 monitoring, endpoint detection and response, identity and access controls, phishing protection and incident response. NetSys builds the security stack into every managed agreement instead of selling it back as an add-on, and the security layer can also run on its own if another provider handles your day-to-day IT. Either way the terms are month to month.

Can you help a New York business meet SHIELD Act and NYDFS requirements?

Yes. The SHIELD Act expects reasonable administrative, technical and physical safeguards from any business holding New York residents' private information, and NYDFS Part 500 goes further for licensed financial businesses, with named controls such as multifactor authentication, access privilege limits, monitoring and a written program. The controls in a NetSys engagement map directly onto those expectations, and we document them in a form you can hand to a regulator, an auditor or an insurer.

How do you choose a cybersecurity company in NYC?

Pick the firm that can show you the controls working, not a list of products. Ask who investigates an alert at night, whether multifactor authentication and endpoint detection cover every account and device, when a backup was last restored, and how long the contract runs. We answer each of those in writing, and our agreements are month to month.

Start with the free test

See what an attacker sees before they do.

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 and ongoing security management are scoped separately.

Explore Cybersecurity Scope 845-203-3914