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Offensive Security Services

Attack Surface Discovery

Know what attackers can see

You can't defend what you don't know you own. Attackers start every engagement with reconnaissance: Arcanum does the same, mapping the full external footprint of your organization: forgotten subdomains, shadow IT, exposed services, cloud assets, and credential leaks.

The result is a complete, attacker's-eye inventory of everything reachable from the internet: the assets, services, and exposures that define where a real intrusion would begin.

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External attack surface reconnaissance
Our Approach

Reconnaissance, done the attacker's way

We approach your perimeter the way an adversary would, enumerating everything you expose, then translating raw discovery into the exposures that actually matter.

Comprehensive Discovery

// mapping the perimeter
  • Domain & subdomain enumeration: uncover every hostname tied to your brand, including long-forgotten and staging environments.
  • IP & ASN mapping: chart your netblocks, hosting providers, and autonomous systems to define the true edge of your network.
  • Cloud & SaaS asset discovery: surface buckets, tenants, and third-party platforms operating under your name.
  • Exposed services & ports: identify reachable services, admin panels, and listening ports across the estate.
  • Technology fingerprinting: profile the software, frameworks, and versions that shape your exposure.
  • Shadow IT & forgotten infrastructure: find the assets no one is tracking: the ones attackers love most.

Exposure Analysis

// what it means
  • Leaked credentials & secrets: surface exposed passwords, API keys, and tokens circulating in breaches and public repositories.
  • Misconfigurations: flag open storage, permissive access, and services left in insecure states.
  • Expired & weak certificates: catch TLS issues that undermine trust and signal neglected assets.
  • Dangling assets: detect stale DNS records and orphaned resources ripe for subdomain takeover.
  • Prioritized by exploitability: we rank every finding by real risk, so you fix what an attacker would reach first.
Why Arcanum

Recon by people who break in for a living

Our discovery is driven by practitioners who use the same techniques attackers rely on, not automated scans that stop at the surface.

01

Attacker-Grade Recon

We map your footprint using the tradecraft real adversaries use, going far beyond a template scan to see what an operator would actually target.

02

Finds the Unknown

Shadow IT, forgotten subdomains, and orphaned cloud assets are where breaches begin. We surface the infrastructure your own teams have lost track of.

03

Leak & Credential Exposure

We hunt down leaked credentials, exposed secrets, and API keys already circulating in the wild, closing doors before they're walked through.

04

Prioritized by Risk

Every finding is ranked by exploitability and real-world impact, so your team spends effort where it reduces the most risk.

Your Outcome

A clear picture of your external exposure

You walk away with a complete inventory of your internet-facing estate and a prioritized plan to shrink it.

What our findings detail

// deliverables
  • Full asset inventory: every domain, IP, cloud resource, and service reachable from the internet.
  • Exposed & forgotten services: live endpoints, admin panels, and shadow infrastructure you weren't tracking.
  • Leaked credentials & secrets: exposed passwords, keys, and tokens tied to your organization.
  • Misconfig & certificate issues: insecure settings, open storage, and TLS problems across the perimeter.
  • Prioritized exposure list: findings ranked by exploitability so remediation starts with what matters most.

What you gain

// outcomes
  • Complete visibility: an authoritative view of everything your organization exposes to the internet.
  • A smaller attack surface: the knowledge to decommission, harden, and reclaim assets before they're abused.
  • Faster response: credential and leak intelligence that lets you rotate and revoke before an intrusion.
  • Confident prioritization: a risk-ranked roadmap your team can act on immediately.

See your organization the way an attacker does

Let Arcanum map your full external footprint and hand you the intelligence to close the gaps first. Start a conversation about Attack Surface Discovery.

Work with Us → See Consulting