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NIS2

External Attack Surface Management (EASM)

External Attack Surface Management continuously discovers and inventories everything visible to an outside attacker.

That includes public domains and subdomains, exposed cloud services, internet-facing applications, and forgotten or unmanaged assets. Shadow IT is covered too.

Problem
Solution

You don't know everything you have exposed to the internet.

Cloud services, shadow IT, forgotten domains, and unmanaged assets keep appearing outside your team's visibility. If you don't know an asset exists, you can't protect it, and attackers are often the first to find it. 

Continuous discovery gives you a complete, outside-in view.

We continuously map every domain, subdomain, cloud service, and internet-facing asset tied to your organization, including shadow IT and forgotten assets. It's the foundation Vulnerability Management builds on to prioritize remediation. 

Results

What can you expect?

Continuous Discovery of Internet Facing Assets
Shadow IT and Unmanaged Asset Detection
External Exposure Mapping
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Reference case

Mapping a constantly shifting perimeter for Willemen

Incident Response and Forensics. External Attack Surface Management. Image of a construction site with some workers carrying steel bars.

Willemen Groep has 100 active construction sites and numerous temporary joint ventures.

The company’s internet-facing footprint kept growing, and nobody had a complete picture of it. Forgotten domains, temporary setups and unmanaged assets could stay exposed long after a project ended.

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How External Attack Surface Management works

  • Discover
  • Correlate
  • Report and address

Phase 1 Discover

Continuously discover and inventory everything visible from the outside: domains, subdomains, cloud services, internet facing applications, and third-party exposure. This includes shadow IT and assets your team may have forgotten about.

Phase 2 Correlate

Correlate assets, ownership, and dependencies to maintain an accurate, up-to-date view of your external attack surface. Every asset is linked to your organization and given context, so you know what it is, who owns it, and why it matters.

Phase 3 Report and address

Discovered assets and exposures are reported back to you, with alerts whenever something new or unmanaged shows up.

That way, nothing stays exposed without you knowing about it. Findings feed directly into Vulnerability Management, where they’re prioritized and remediated before an attacker can use them.

External Attack Surface Management. Two members and the Detection and Response team at work in the SOC (Security Operations Center) discussing things behind a pc, at a desk.

Do you still have some questions?

FAQ
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Keep your assets in check.

The expertise and commitment shown by ACEN MDR has been pivotal in advancing our cybersecurity measures. Their comprehensive management of the SIEM system and round-the-clock support have not only enhanced our security capabilities but have also instilled a greater sense of confidence in our digital operations.
Jan DupontInfrastructure & Security Manager A&C Systems
Incident Response and Forensics. External Attack Surface Management. A&C Systems logo, two organic shapes forming the letters A and C in lilac and orange.
"Security evolves so rapidly that you constantly need experts who work on it every day. By choosing a Managed Security Provider, Willemen has direct access to an entire team that takes care of everything for them 24/7.”
Ken Van HasseltAccount Manager at ACEN
Image of Ken Van Hasselt, part of the ACEN Sales team at ACEN, posing in the office.
In the first weeks, you’re exposed to a variety of tools, domains and people, giving you a real taste of the work here. What stood out most to me was teamwork. It’s not just something we say at ACEN, it’s how we work. All you have to do is ask and someone will gladly provide you with a second pair of eyes.
Kenneth ClaesIT Infrastructure & Operations Manager @ Willemen Groep
Photo of Kenneth Claes, IT Infrastructure & Operations Manager at Willemen Groep.
We think three times before we invest. Our tools need to be modern and preferably superior to previously used tools. This was also the case for our endpoint solution. To protect 15.000 assets, which are mostly computers but indirectly also medical devices, we were looking for a trustworthy tool that fits within our budget, not only now but also in the future. So maintenance costs should be kept to a minimum.
Reinoud ReyndersIT Manager Infrastructure & Operations at UZ Leuven
UZ Leuven logo in light blue, typographic with a small graphic in the front.
Nowadays, many cyber attacks take advantage of zero days, vulnerabilities still unknown, undescribed or unpatched. So these threats don’t have a signature with information to detect it and pose a great risk. With the help of AI which recognizes behavior similar to other malware, UZ Leuven now has a behavior based tool in its hands which is able to detect zero days.
Federico MeinersCybersecurity Architect at ACEN
Image of Federico Meiners, head of MDR at ACEN, posing in the office.
FAQ

Everything you still wanted to know in one place

What do we get with External Attack Surface Management, and how do we hear about critical findings?

Discovered assets and exposures are reported in your monthly report. Critical exposures are not held back for the report: they are escalated immediately through our SOC.

How is External Attack Surface Management different from a vulnerability scan?

A vulnerability scan checks assets you already know about. External Attack Surface Management finds the assets you don't know about, so nothing exposed stays outside the picture.

Vulnerability Management then assesses weaknesses and prioritises them by how actively they're exploited and how likely exploitation is.

Why isn't internal asset inventory enough?

Internal inventories are built from the inside and only list what your team knows about and has recorded. Attackers look from the outside, and they often find what never made it onto the list.

We map your attack surface from the outside in, the same way an attacker would.

That gives you an independent view with no installation and no changes to your environment.

What counts as our external attack surface?

Your external attack surface is everything connected to your organisation that someone outside can see or reach. That includes domains and subdomains, exposed cloud services and internet-facing applications.

It also covers third-party exposure and assets that have been forgotten or are no longer managed. It changes all the time, as new websites, cloud projects, suppliers and temporary environments come and go.

Explore our other Detection and Response Services

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