Cybersecurity · Manhattan

Cybersecurity Services in Manhattan, NY

Manhattan firms are attacked for what they hold: client money, deal files, privileged documents and the passwords that open all three. NetSys runs detection and response, identity and email protection, vulnerability scanning, staff training and recoverable backups for offices from the Financial District to Harlem, with engineers who act on alerts themselves and come on site from Brooklyn.

All IT services in Manhattan, NY

The short answer

NetSys provides cybersecurity services in Manhattan: ThreatDown managed detection and response on every device, multifactor authentication and Entra ID Conditional Access across Microsoft 365, Barracuda email protection, Rapid7 vulnerability scanning, KnowBe4 training and immutable Datto or Veeam backups with tested restores. Manhattan is inside our on-site area, so engineers from our Brooklyn office come to the floor for firewall work, device swaps and incident response, while most alerts are contained remotely first. Monitoring and emergency service run 24/7; the help desk is staffed seven days a week from 4 a.m. to 11 p.m. Eastern time. Agreements run month to month.

Service information by The NetSys Group. Our editorial standards.

How cybersecurity is delivered in Manhattan

Detection runs remotely first. ThreatDown's MDR analysts and our engineers watch every enrolled laptop, desktop and server along with the Microsoft 365 tenant, and a device that starts encrypting files or calling out to a known bad address is isolated before anyone gets on a train. When the response needs hands, an engineer follows on site the same day: Park Slope is about 25 minutes from the Financial District by subway and 35 to 45 minutes from Midtown. On-site security work covers reimaging or replacing a compromised machine, swapping or hardening a firewall, pulling devices for forensic review, and a walk-through of closets, printers and conference rooms to find what is exposed. We clear the building's vendor paperwork in advance, so a security call is not held at the lobby desk. Monitoring runs 24/7 from Brooklyn, and so does emergency service. Our staffed help-desk hours are 4 a.m. to 11 p.m. Eastern time, seven days a week. The proposal states severe-incident escalation, authorized remediation and any other after-hours work.

What recent New York incidents show about the way in

Two city cases are worth knowing. In June 2021 the New York City Law Department disconnected its systems after an intrusion, and lawsuits it was defending stalled while officials could not say when access would return; they also declined to say whether multifactor authentication had been in place, although a 2019 Cyber Command memo required it for staff handling sensitive information. In June 2023 the city's Department of Education said attackers had used the MOVEit file-transfer flaw to reach documents covering about 45,000 students, plus staff and service providers. One case turns on a login, the other on a vendor's product. Both doors exist in a 25-person Manhattan firm, which is why our first weeks concentrate on sign-in controls and on an inventory of every outside tool that touches client data.

Identity and email controls that stop wire fraud

Business email compromise starts in a mailbox, not on a server. A partner's account is phished, a hidden rule forwards replies to an outside address, and a client receives new wiring instructions that look routine. The controls against it are specific. Every account gets multifactor sign-in, with phishing-resistant methods for administrators and finance staff. Entra ID Conditional Access blocks sign-ins from unmanaged devices and unexpected countries, and legacy authentication is switched off. Barracuda Email Protection screens for lookalike domains and impersonation, and DMARC at enforcement makes your own domain harder to spoof. Keeper replaces shared password spreadsheets, and administrator rights live in separate accounts used only for admin tasks. Finally, a written call-back rule says any change to payment details is confirmed by phone to a number already on file.

Shared floors, co-working desks and networks you do not control

Plenty of Manhattan teams work on networks they do not own: a co-working floor, a sublet suite in a Midtown tower, a client's conference room, a hotel near a courthouse. On those networks the security has to travel with the device. Laptops are enrolled in Intune with disk encryption, a host firewall and ThreatDown EDR, and Microsoft Defender for Business adds protection where the license includes it. DNS filtering applies wherever the laptop connects, and company systems are reached through a VPN or a Conditional Access policy that checks the device, never through an open port on an office router. Printers and multifunction copiers, which often belong to the landlord or a leasing company, are kept away from the segment that holds client files. When the firm controls its own suite, firewall and segmentation work falls under our network security service.

The first 30 days of a cybersecurity engagement in Manhattan

Week one is discovery. We run the free external penetration test, a remote test of your public footprint within a scope we agree in writing, plus a Rapid7 scan of the internal network, and we pull the Microsoft 365 sign-in and sharing settings. Week two installs ThreatDown on every device and turns on MFA for anyone who still lacks it, starting with administrators and finance. Week three moves mail behind Barracuda, sets DMARC to monitoring and takes a first immutable backup that we restore in front of you. Week four delivers the written incident response plan, a phishing baseline from KnowBe4 and a findings report ranked by risk. Staff notice two things: a sign-in prompt on their phones and one short training video. Everything else happens in the background.

What is included

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

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

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

Published case study

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.

Read the full case study (25 attorneys + staff)

From our client work

Cybersecurity work for other clients

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

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

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, 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.

Cybersecurity in Manhattan: FAQs

Do you provide on-site cybersecurity in Manhattan?

Yes. Manhattan sits within our on-site coverage, served from the one NetSys office in Park Slope. Alerts are investigated and contained remotely by ThreatDown's analysts and our engineers, and an engineer comes to your office when the job is physical: replacing a compromised laptop, rebuilding or replacing a firewall, collecting devices for an insurer's forensic team, or walking the floor to review closets, guest Wi-Fi and printers. Severe events, such as ransomware or a systems-down outage, go straight to your dedicated engineer.

What do cybersecurity services cost for a Manhattan business?

The managed security service is billed per user per month, set after an assessment rather than from a public price list. The price depends on the number of people and devices, how many servers and cloud workloads need protection, whether you need compliance evidence for NYDFS, the SEC or a client audit, and whether staff work on networks you do not control, which puts more of the protection on each laptop. Penetration testing beyond the free external test, and incident response projects, are scoped and quoted separately.

What must a Manhattan business do after a data breach?

It depends on who you are. Under the SHIELD Act, as amended in December 2024, affected New York residents must be told within 30 days of discovering the breach, and the Attorney General, the Department of State and the State Police are notified too. A DFS-licensed firm must report a cybersecurity incident to the department within 72 hours. SEC-registered advisers and broker-dealers owe affected individuals notice within 30 days under the amended Regulation S-P. Our incident plan lists which clocks apply to you. This is general information, not legal advice.

What happens in the first hour if we are hit by ransomware?

The affected devices are isolated through ThreatDown as soon as the detection is confirmed, and your dedicated engineer calls the person named in your incident plan. We stop the spread first: disable compromised accounts, revoke sign-in sessions and block the attacker's addresses at the firewall. Then we preserve evidence for your insurer and counsel, confirm the immutable backups are intact and start restoring the systems the plan ranks first. Across more than 30 ransomware incidents in three years, every client was fully recovered, and those with a disaster recovery plan were back within 24 hours.

Will these controls help with cyber insurance and client security reviews?

They are the controls those forms ask about. Underwriters and corporate clients almost always want multifactor authentication, endpoint detection and response, backups that are offline or immutable and tested, email filtering and security training, and the service keeps a record of each one: enrollment reports, restore logs and training results with dates. We fill in the technical answers with you from those records rather than from memory. If a reviewer asks for a penetration test report or a written incident response plan, we provide what is in scope and tell you plainly where a gap remains.

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