Cybersecurity Services in New York City
New York City businesses get attacked for ordinary reasons: they move money, they hold client and patient records, and most of them run on a Microsoft 365 tenant nobody has hardened since it was set up. NetSys provides cybersecurity services across the five boroughs from our office in Brooklyn: 24/7 monitoring, managed detection and response on every device, multifactor authentication with Conditional Access, phishing protection, staff training and immutable backups. Engineers come to your office when the work needs hands, and the agreement runs month to month.
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. It starts with a free Tier 1 external penetration test of your website, public systems, public-record exposure and phishing likelihood. 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.
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 engagement opens with the free external penetration test, followed by a review of your Microsoft 365 tenant, devices, network and backups as they exist today. 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 shows what the internet can already see about your business before anything is signed.
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
- The free Tier 1 external penetration test to open the engagement, findings yours to keep
- Tier 2 source code penetration testing in an isolated sandbox, quoted per codebase
A Midtown law firm with escrow accounts and a tenant nobody hardened
A composite example of work we do in New York City, written so you can picture the first 90 days. It is not a specific client. Our real, anonymized engagements are in 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 external penetration test to establish what the firm exposes publicly, including its email authentication records and the staff footprint an attacker would use to build a phishing lure
- 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 corrected so the firm's domain can no longer be spoofed, 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.
Related pages
Read the full Cyber Security service page. See everything NetSys delivers in New York City.
Also in New York City: Network Security & Monitoring · Backup & Disaster Recovery
Cybersecurity elsewhere: Brooklyn, NY · Nassau County, NY · Suffolk County, NY · Westchester County, NY · Stamford, CT
Related services: Managed IT Services · Penetration Testing · Cyber Insurance Readiness · Privileged Access Management
Cybersecurity in New York City: FAQs
Who provides cybersecurity services in New York City?
The NetSys Group provides managed cybersecurity to businesses across all five boroughs from its office at 1 Prospect Park SW in Brooklyn. 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. Engineers come on-site anywhere in New York City for the work that needs hands. NetSys has been doing this work since 1998, and every agreement runs month to month.
How much do cybersecurity services cost in NYC?
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. The free external penetration test comes first and costs nothing, so you know what needs fixing before you see a quote.
Do you come on-site for cybersecurity work in New York City?
Yes. 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.
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 external test shows what your firm already exposes, which is a better basis for the decision than a guess.
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.
See what an attacker sees before they do.
The free external penetration test covers your website, public systems, public-record exposure and phishing likelihood, with a fix list you keep either way.