Tests de sécurité post-incident : construire la résilience après une brèche

Post-Incident Security Testing: Because You Don’t Want to Go Through This Again 

When a company suffers a cyber incident, mitigating the breach is not the end of the story. Instead, it is the beginning of a new chapter in resilience. Recovering from a compromise is only half the battle. The real question is: how can you gain back piece of mind and confidence in your security posture? 

That’s where post-incident security testing comes in. At CYPFER, we help organizations turn lessons learned into stronger defenses by simulating the tactics of real-world adversaries, probing for weaknesses, and validating whether newly deployed controls can withstand another attempt. 

Why Post-Incident Testing Matters 

Traditional defensive measures, such as firewalls, antivirus, even basic monitoring, are no longer enough. Once an attacker has been inside your systems, the margin for error narrows dramatically. A single misconfiguration or overlooked weakness can invite another breach. Post-incident testing provides: 

• Validation: Confirm that remediation efforts actually work under pressure. 

• Visibility: Uncover vulnerabilities that weren’t detected before the incident. 

• Resilience: Ensure your organization is stronger than it was before the compromise. 

How We Do It 

Our Offensive Security Team combines years of hands-on experience with cutting-edge tools and community-driven innovation. We don’t just run scans and tell you everything looks ok. We replicate adversary behavior, test the limits of your environment, and demonstrate potential business impact. 

External Network Testing 

We evaluate internet-facing systems, like web applications, VPNs, firewalls, and cloud assets to identify exploitable weaknesses before cybercriminals do. 

Internal Network Testing 

We simulate insider threats and lateral movement within your environment, focusing on Active Directory, Entra ID (Azure), user privilege escalation, and endpoint vulnerabilities. 

Test D'application Web 

We perform deep-dive assessments of authentication, session management, injection flaws, and data handling, all of which are areas where a single flaw can lead to major data loss. 

Specialized Systems Testing 

From IoT and OT systems to mobile apps and fat client applications, we assess for insecure APIs, misconfigurations, and improper data handling that could expose critical assets. 

Outcome: You receive a detailed, risk-based report with proof-of-concept exploits, prioritized remediation guidance, and strategic recommendations. 

Beyond Vulnerabilities: Testing Your Detection 

A strong defense is only half the story. Detection and response are just as critical. Our Detection Capability Assessment evaluates whether your SIEM, EDR, IDS/IPS, and other monitoring systems are configured to actually catch today’s threats, from the basic techniques to the sophisticated ones. CYPFER can replay the attack to assess whether your newly deployed security measures would detect it and help you strengthen your detection and response capabilities. 

• Objective: Measure your ability to detect, investigate, and respond to adversary activity. 

• Approach: Align monitoring and response with the MITRE ATT&CK framework for maximum visibility. 

• Outcome: Close coverage gaps, optimize detection rules, and enhance incident response effectiveness. 

Best for organizations that want to move beyond “checking the box” and instead build a living, breathing detection strategy. 

Expertise, Tools, and Community 

• Expertise & Experience: Our team has navigated countless post-incident scenarios and knows the latest attack vectors firsthand. 

• Innovative Tools: We deploy the same advanced techniques used by adversaries, ensuring your defenses hold up in the real world. 

• Community Engagement: As active contributors to the cybersecurity community, we share knowledge and tools that keep us, and our clients, ahead of emerging threats. 

The Bottom Line 

A breach is painful. But it’s also an opportunity to build lasting resilience. With post-incident security testing, you don’t just recover. We help you adapt, evolve, and emerge stronger. 

Don’t wait for the next attack. Trust CYPFER’s Offensive Security Team to fortify your organization’s defenses today.