Prevention eventually fails — so the real question is what happens next. An assumed breach assessment starts from a realistic compromised position (a workstation, a set of user credentials) and measures how far an attacker could go, how much they could reach, and whether you'd notice.
It's the fastest way to understand your true blast radius without waiting for the initial-access phase.
An assumed breach assessment from AgentOffense starts from a realistic compromised position — standard user credentials or a managed workstation — and measures how far an attacker could reach. We map lateral movement, escalate privileges, harvest credentials and locate sensitive data, while evaluating whether your detection and containment would catch the activity. It is the fastest, most cost-effective way to understand your true internal blast radius.
Why it matters
Prevention eventually fails, so the decisive question is what happens next — how far an attacker gets and how much they can reach once inside. Waiting to test only the perimeter leaves your true blast radius unknown.
An assumed breach assessment starts from a realistic compromised position and measures lateral movement, privilege escalation and data access, giving you the fastest possible read on your real internal risk.
What we test
- Post-compromise lateral movement
- Privilege escalation to critical systems
- Credential harvesting & reuse
- Sensitive data discovery & access
- Detection & response evaluation
- Containment and segmentation testing
Common vulnerabilities we uncover
- Broad lateral movement from one foothold
- Privilege escalation to critical systems
- Credential harvesting and reuse
- Excessive access to sensitive data
- Weak detection of post-compromise activity
- Poor containment and segmentation
Our Assumed Breach Assessment methodology
- Scoping & rules of engagement. We agree objectives, targets and boundaries for your assumed breach assessment, so testing is safe, authorized and focused on what matters to your business.
- Reconnaissance & mapping. We enumerate the full attack surface in scope, building a complete picture before any exploitation begins.
- Manual exploitation. Our senior testers chain vulnerabilities by hand — going far beyond automated scanners — to prove real, demonstrable impact.
- Analysis & reporting. Every finding is triaged, risk-rated with CVSS and written up with a copy-paste reproduction and clear remediation.
- Remediation support & free retest. We support your team through the fixes and retest the remediated issues to confirm they are genuinely closed.
Tools & techniques
Starting from provided credentials or a managed workstation, we use lateral-movement, privilege-escalation and credential-harvesting techniques mapped to MITRE ATT&CK, all validated manually. We locate sensitive data, test detection and containment, and document the full post-compromise chain, giving you a fast, accurate read on your true internal blast radius.
When you need Assumed Breach Assessment
- To quantify blast radius without a full attack chain
- When you assume prevention will eventually fail
- For zero-trust and containment validation
- As a focused alternative to a full red team
What you receive
- Blast-radius analysis
- Compromise chain with evidence
- Detection gap findings
- Containment recommendations
What’s included in your report
Every assumed breach assessment engagement concludes with a comprehensive, board-ready report and a working session to walk your team through it. Your report includes:
- An executive summary with overall risk posture for non-technical stakeholders
- Detailed technical findings, each with a step-by-step, copy-paste reproduction
- CVSS v3.1 severity ratings and business-impact context for every issue
- Prioritized, actionable remediation guidance your engineers can apply directly
- A complimentary retest to confirm fixes and update finding status
- A formal attestation letter for customers, auditors and compliance programs
Standards & frameworks
MITRE ATT&CK
PTES
NIST SP 800-115
Outcomes you can expect
After your assumed breach assessment, you will have clear, evidence-based visibility into your real security risk — not a scanner’s guesswork. You will know exactly which weaknesses an attacker could exploit, what the business impact would be, and the precise steps to fix them in priority order. Teams use our findings to close critical gaps, satisfy customer and regulator security requirements, and demonstrate due diligence to their board. With a complimentary retest included, you also get documented proof that the issues are genuinely resolved.
Engagement details & logistics
Every assumed breach assessment starts with a short, no-obligation scoping call to understand your goals, environment and constraints, followed by a fixed-price proposal and a clear statement of work. Most engagements are delivered fully remotely, with on-site work arranged where it genuinely adds value. Throughout testing we maintain an agreed communication cadence and escalate any critical, high-impact finding to you immediately rather than waiting for the final report. All work is performed under a signed NDA with strict data-handling controls, using safe, non-disruptive techniques and carefully coordinated rules of engagement to protect your production systems. On completion you receive your report and a walkthrough session, followed by a complimentary retest once your fixes are in place. Typical engagements are booked one to three weeks in advance, and urgent or pre-deadline testing can often be accommodated — just ask at hi@agentoffense.com.
Why organizations choose AgentOffense for Assumed Breach Assessment
Our assumed breach assessment is delivered by senior offensive-security engineers who test the way real attackers do — manually, creatively and with a relentless focus on proving genuine, demonstrable impact. Here is what sets our engagements apart:
- Manual, exploit-driven testing that chains vulnerabilities the way a real attacker would, going far beyond what automated scanners can find.
- Reproducible proof for every finding, with copy-paste reproduction steps your engineers can follow and independently verify.
- Honest severity calibration so you invest in fixing what genuinely matters and avoid wasting effort on false positives and noise.
- Clear, business-focused reporting that speaks to engineers and executives alike, tying every issue to real-world impact.
- A complimentary retest included, so you get documented proof that your fixes actually close the attack path.
- Responsible, collaborative delivery with a named point of contact and secure handling of all data throughout the engagement.
Explore related services
Assumed Breach Assessment is frequently scoped alongside our other offensive-security services for broader coverage. Explore related engagements that complement it:
- Internal Network Penetration Testing — Internal network penetration testing — lateral movement, privilege escalation and segmentation review from an assumed-breach position…
- Active Directory Penetration Testing — Active Directory penetration testing — Kerberos attacks, delegation abuse, ACL and privilege-escalation paths to domain admin,…
- Red Team Operations — Full-scope red team operations — stealthy, objective-driven attack simulation across digital, human and physical vectors to…
Frequently asked questions
Why skip the initial access phase?
It saves time and cost, and focuses budget on what matters most — how bad a breach becomes once someone is inside, which is where the real damage happens.
What starting access do you need?
Typically standard user credentials and/or access to a managed workstation, mirroring a phished employee.
Is this a red team?
It's a focused variant. A full red team also tests initial access and stealth; an assumed breach concentrates on post-compromise impact.
Why skip the initial-access phase?
It focuses budget on what matters most — how bad a breach becomes once someone is inside, which is where the real damage happens.
What starting access do you need?
Typically standard user credentials and/or access to a managed workstation, mirroring a phished employee.
What starting access do you need?
Typically standard user credentials and/or access to a managed workstation, mirroring a phished employee.
How does this differ from internal network testing?
An assumed breach concentrates on post-compromise impact and detection, while internal testing aims for broad coverage of internal weaknesses.
How long does an assumed breach assessment take?
Typically one to two weeks, which is faster and more cost-effective than a full red team.
Does it test detection as well as impact?
Yes. We evaluate whether your detection and containment would catch the post-compromise activity as we move.