Incident Response for Pentesters: Learning from Breaches

Studying real breaches gives pentesters a direct way to test and improve their incident response skills. You see exactly where detection failed, how attackers moved, and what evidence got missed. That turns abstract plans into checks you can run in your own assessments.

Break Down a Breach Log by Log

Take the 2017 Equifax incident as a starting point. Attackers sat on the network for 76 days after exploiting a known Apache Struts flaw. The logs showed repeated outbound connections to unknown domains that went unblocked. Run the same test on a client environment: drop similar traffic and measure how long it takes for your monitored tools to flag it.

Apply the same review to the 2020 SolarWinds supply chain compromise. The attackers used signed binaries and lived off the land for months. In your next pentest, attempt to blend command execution with legitimate processes and note every log source that stays silent.

• Map each breach timeline to the specific log sources you would query first.
• Recreate the initial access vector in a lab and time your detection rules.
• Document which evidence would survive a quick attacker cleanup script.

These exercises expose gaps faster than generic tabletop exercises. You end up with concrete rule tweaks instead of high level recommendations.