SilentGrid

Assumed Breach

Simulate an internal compromise to assess your organisation's ability to detect, contain, and mitigate real-world threats that bypass traditional perimeter defences.

Type

Adversary Simulation

Focus

Post-Breach Resilience

Approach

Internal Attack Simulation

Deliverable

Strengthened Internal Defences

On This Page

Testing Resilience Beyond the Perimeter

Perimeter defences are not infallible. Sophisticated adversaries consistently bypass external protections, whether through supply chain attacks, phishing campaigns, or zero-day exploits. The question is not if an attacker will gain initial access, but how far they can go once inside.

SilentGrid's Assumed Breach Assessment starts from the premise that your perimeter has already been compromised. This controlled exercise simulates post-breach scenarios to evaluate your organisation's ability to detect, respond to, and contain adversarial movement within the internal network.

By replicating the tactics, techniques, and procedures (TTPs) of advanced threat actors, SilentGrid tests your organisation's ability to mitigate lateral movement, privilege escalation, and data exfiltration – exposing blind spots and operational gaps that often go unnoticed until a real incident occurs.

Assumed Breach Assessments Are Critical

Modern adversaries do not stop at breaching the perimeter. Once inside, attackers exploit misconfigurations, unpatched systems, and overlooked vulnerabilities to achieve persistence, access sensitive data, or escalate privileges.

Internal Navigation

Reveals how easily attackers can navigate internal systems

Security Gaps

Identifies gaps in segmentation, access controls, and detection

Response Effectiveness

Tests SOC, IR, and monitoring solutions under real conditions

SilentGrid's Assumed Breach Methodology

Our approach simulates realistic post-compromise scenarios to thoroughly test your internal defences and response capabilities.

1

Establishing Initial Foothold

  • • Simulate scenarios such as compromised endpoints or user credentials
  • • Malware deployment through spear phishing or supply chain attacks
  • • Insider threat emulation from compromised accounts or rogue employees
  • • Evaluate your endpoint detection and response (EDR) capabilities
2

Privilege Escalation and Lateral Movement

  • • Exploit misconfigurations, weak passwords, and insecure protocols
  • • Move laterally using legitimate administrative tools to avoid detection
  • • Test Active Directory controls, segmentation, and access restrictions
3

Persistence and Command & Control

  • • Establish persistent backdoors using sophisticated techniques
  • • Deploy custom C2 infrastructure to simulate APT communication patterns
  • • Test your ability to detect and block covert channels
4

Data Discovery and Staging

  • • Identify and access sensitive data repositories
  • • Test data classification and access control effectiveness
  • • Simulate data staging techniques used by real adversaries
5

Exfiltration and Impact

  • • Test data loss prevention (DLP) controls
  • • Simulate various exfiltration methods including encrypted channels
  • • Assess potential business impact of successful attacks
6

Detection and Response Analysis

  • • Comprehensive evaluation of detection capabilities at each stage
  • • Analysis of incident response effectiveness and containment strategies
  • • Detailed timeline of detection opportunities and misses

Scenario-Based Testing

Beyond generic testing, we offer targeted scenario simulations based on your industry's most relevant threats.

Popular scenarios include:

Ransomware Simulation

Test resilience against encryption and lateral spread

Data Theft Scenarios

Evaluate protection of intellectual property and sensitive data

Supply Chain Attacks

Simulate compromise through trusted third-party access

Benefits

  • • Validate incident response procedures against specific threats
  • • Test backup and recovery capabilities under pressure
  • • Identify critical assets most at risk
  • • Build confidence in breach response capabilities
Discuss Custom Scenarios →

Key Findings and Insights

Assumed Breach assessments provide critical visibility into your internal security posture:

Internal Vulnerability Exposure

Comprehensive mapping of exploitable vulnerabilities accessible from an assumed breach position

Lateral Movement Paths

Detailed documentation of how attackers can pivot through your network

Privilege Escalation Vectors

Identification of pathways to administrative access and domain dominance

Detection Blind Spots

Areas where adversary activity goes undetected by current security controls

Comprehensive Deliverables

Attack Path Documentation

Visual mapping of all successful attack paths and pivot points discovered

Detection Opportunity Timeline

Chronological analysis of where attacks could have been detected

Risk-Prioritised Findings

Vulnerabilities ranked by exploitability and potential business impact

Tactical Recommendations

Specific hardening measures to block identified attack vectors

Strategic Security Roadmap

Long-term improvements for defence-in-depth architecture

Executive Risk Assessment

Business-focused analysis of potential breach impacts

Is Assumed Breach Testing Right for Your Organisation?

Assumed Breach assessments are ideal for organisations that:

  • ✓ Have mature perimeter defences but need to validate internal security.
  • ✓ Want to understand their true breach impact and containment capabilities.
  • ✓ Need to test Zero Trust implementations and network segmentation.
  • ✓ Require evidence of defence-in-depth effectiveness for compliance or insurance.
Test Your Internal Defences

Start Your Assumed Breach Assessment

Discover how far an attacker can go once inside your network

Our expert team will simulate realistic breach scenarios to identify critical gaps in your internal security controls.

Starting Point

Post-Compromise

Duration

2-6 weeks typical

Focus Areas

Internal Networks

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