Cybersecurity Services in Manhattan
NetSys provides cybersecurity services to businesses in Manhattan: 24/7 managed detection and response on every device, identity and email protection across Microsoft 365, vulnerability scanning, staff training and immutable backups, with an engineer acting on alerts rather than forwarding them. Our office is at 1 Prospect Park SW in Brooklyn, so Park Slope to the Financial District is 25 minutes and to Midtown 35 to 45 by subway, which is how most Manhattan site visits happen; engineers come to you for the work that needs hands, and monitoring and help desk run remotely around the clock. Most clients run between 10 and 75 seats, and every agreement is month to month.
The short answer
NetSys provides cybersecurity to businesses in Manhattan: ThreatDown managed detection and response on every device, multifactor authentication and Conditional Access across Microsoft 365, Barracuda email protection, Rapid7 vulnerability scanning, security awareness training and immutable backups with tested restores. Engineers come to you for the work that needs hands; monitoring and help desk run remotely around the clock from our Brooklyn office. Most clients run between 10 and 75 seats, and every agreement is month to month.
How cybersecurity is delivered in Manhattan
Our office is at 1 Prospect Park SW in Brooklyn, so Park Slope to the Financial District is 25 minutes and to Midtown 35 to 45 by subway, which is how most Manhattan site visits happen; engineers come to you for the work that needs hands, and monitoring and help desk run remotely around the clock. The buildings decide a lot of the design. Pre-war office buildings from the Garment District to Wall Street have one carrier in the riser more often than not, landlords control riser access and after-hours work windows, and shared-floor and co-working leases mean the network under your staff is somebody else's, which changes how endpoint security and remote access have to be built. The carriers we see most in Manhattan are Verizon Fios, Spectrum Business, Lightpath and Crown Castle fiber, and the failover design starts with which of them actually reach your building.
Who cybersecurity in Manhattan is built for
Most of our Manhattan work sits in Midtown, the Financial District, Hudson Yards, the Flatiron District and the Upper East Side: law firms on iManage, hedge funds and family offices on Bloomberg Terminal, wealth managers and RIAs on Orion, accounting firms on Thomson Reuters CS Professional Suite, agencies and media companies on HubSpot, and real estate and property managers on Yardi Voyager. Each carries its own compliance load, which the section below covers, and each has a line-of-business vendor we coordinate with rather than work around. 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.
What tends to go wrong in Manhattan
Two things shape the continuity design here. First, the weather and the grid: the outages here are a cut riser, a failed building circuit or a Con Edison vault fire, so a second carrier or wireless failover and off-site backups do more than any storm plan. Second, the attacks that actually land locally are ordinary ones, and the public record shows how they go: the June 2021 intrusion into the New York City Law Department's systems, disclosed by the city, which traced back to a single account without multifactor authentication. The controls in the next section are the ones that would have changed those stories.
Cybersecurity in Manhattan: what NetSys delivers
Detection and response
- ThreatDown managed detection and response with EDR agents on every workstation, laptop and server, monitored 24/7
- Microsoft Defender for Business and Rapid7 InsightIDR telemetry from identities, email and endpoints, with a person acting on alerts
- Isolation of a compromised device in real time, with an engineer on the case rather than a ticket in a queue
- Incident investigation and a written timeline for leadership, counsel and your insurer
Identity and email
- Entra ID Conditional Access and multifactor authentication across Microsoft 365, with legacy authentication switched off
- Privileged access and privileged identity management so admin rights are granted just in time and removed afterwards
- Barracuda Email Protection in front of every mailbox, with SPF, DKIM and DMARC enforced
- KnowBe4 security awareness training with simulated phishing built from the lures your industry receives
Exposure and recovery
- Rapid7 InsightVM vulnerability scanning on a schedule, with findings fixed rather than filed
- Cisco Meraki or Fortinet firewall management, segmentation and DNS filtering on office and remote devices
- Immutable backups through Datto SIRIS or Veeam, with restores tested and documented
- The free remote external penetration test, limited to available information and the external scope agreed with you
A 12-person law firm in the Flatiron District
The specific engagements behind this profile are under NDA, so it is written as a generalization rather than a named client. Our published, client-approved outcomes are in case studies.
A law firm in the Flatiron District with 12 staff, client data in iManage and five permanent Global Administrators in the tenant. The antivirus came bundled with the laptops and nobody has looked at it since. There is no multifactor authentication on three of the admin accounts, a former employee's login is still active, the backups have never been restored, and a written incident response plan does not exist.
- ThreatDown MDR and EDR deployed to every workstation, laptop and server, including the ones partners use from home, with the console monitored 24/7
- Rapid7 InsightVM deployed for scheduled vulnerability scanning, with the first month's findings prioritized and closed
- Cisco Meraki firewall installed with intrusion prevention, geo-blocking, segmentation between finance, servers, printers and guests, and DNS filtering on every device
- KnowBe4 rolled out with a baseline phishing test in week one and training on a recurring schedule, aimed at the lures the industry actually receives
- Rapid7 InsightIDR collecting identity, email, endpoint and firewall logs so an intrusion is visible in one console
- Monthly review of dormant accounts, forwarding rules, consent grants and administrator assignments, reported in writing
The exposure is measured monthly and closed, the people are trained against the lures they actually receive, and an incident has a plan with names on it. Leadership sees a written report every month. Terms stay month to month.
Law office: layered security on Microsoft 365 with cloud-to-cloud backup
A 25-attorney firm needed client confidences protected better than a closet server could manage. Alongside a Microsoft 365 migration, NetSys layered anti-phishing and email threat protection, DNS filtering, multifactor authentication on every account and endpoint protection across attorney devices in the office and remote, and established independent cloud-to-cloud backup of the entire tenant because the recycle bin is not a backup strategy for privileged material. The firm reported 82% fewer IT support incidents per month within two quarters.
Compliance in Manhattan: the SHIELD Act and what sits on top of it
If you hold personal information on a resident of New York, the New York SHIELD Act (General Business Law § 899-bb) requires any business holding private information on a New York resident, with no employee-count threshold, to keep reasonable administrative, technical and physical safeguards, and § 899-aa sets the breach-notification duty. Small businesses get a scaled standard, not an exemption. Licensed financial businesses add NYDFS Part 500 (amended in November 2023, with multifactor authentication, asset inventories and annual certification now expected of nearly every covered entity). Healthcare practices layer HIPAA on top, and advisory firms answer to the SEC and FINRA. 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. Most firms we take over have none of it documented, which is the part that matters if you ever have to demonstrate compliance, so the documentation is built during onboarding rather than sold as a separate project.
What cybersecurity costs in Manhattan
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, whether 24/7 response is needed beyond monitoring, 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.
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.
Read next
Industry pages: IT for Legal · IT for Hedge Funds & Family Offices
Terms used on this page: Managed Detection and Response (MDR) · Endpoint Detection and Response (EDR) · Conditional Access
Guides: MDR versus antivirus for a small business · the Conditional Access policies to turn on first
Related pages
Read the full Cyber Security service page. See everything NetSys delivers in Manhattan, NY.
Also in Manhattan: IT Consulting · Managed IT Services · IT Support · Network Security
Cybersecurity elsewhere: New York City · Brooklyn, NY · Nassau County, NY · Suffolk County, NY · Westchester County, NY · Stamford, CT
Related services: Penetration Testing · Cyber Insurance Readiness · Security Assessments · Managed Detection & Response (MDR)
Cybersecurity in Manhattan: FAQs
Will cybersecurity services help us pass a cyber insurance questionnaire?
Yes. Multifactor authentication, endpoint detection and response, tested offline backups and security awareness training are the four controls almost every questionnaire asks about, and the service produces the evidence for each. Our cyber insurance readiness page lists what carriers are asking for in 2026.
What happens if we are breached?
The MDR team isolates the affected device, an engineer investigates and a written timeline goes to leadership, your counsel and your insurer. The incident response plan we write during onboarding names who does what, so the first hour is not spent deciding.
Which security tools do you use?
ThreatDown for managed detection and response, Microsoft Defender for Business and Entra ID Conditional Access in the tenant, Barracuda for email protection, Rapid7 InsightVM for vulnerability scanning, Cisco Meraki or Fortinet at the edge, Datto or Veeam for immutable backups and KnowBe4 for training. Licensing is part of the agreement.
Do you have an office in Manhattan?
Our office is at 1 Prospect Park SW, Suite 6E, Brooklyn, NY 11215, and Park Slope to the Financial District is 25 minutes and to Midtown 35 to 45 by subway, which is how most Manhattan site visits happen. Engineers come to you for anything the help desk cannot fix remotely, and monitoring runs around the clock from Brooklyn. Every agreement is month to month.
Does the NY SHIELD Act apply to a small business?
Yes. It applies to any business holding private information on a New York resident, with no employee-count threshold. Small businesses get a scaled standard, meaning safeguards appropriate to their size, but not an exemption, and the breach-notification duty under § 899-aa applies to everyone.
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.