Forensic reconstruction is the process of rebuilding what happened during a cyber incident by examining logs, file system artifacts, network traces, authentication records, and other technical evidence. The goal is to establish a reliable timeline: how entry occurred, what systems were touched, what data may have been accessed, and whether the attacker left behind persistence or exfiltration paths.
It matters because early incident reports often confirm only partial facts. Reconstruction helps defenders move from suspicion to evidence, which is essential for containment decisions, legal reporting, and recovery. In real attacks, analysts may correlate VPN logs, cloud audit trails, repository access history, endpoint telemetry, and deleted-file remnants to trace attacker activity. It is also used defensively after alerts, so teams can verify whether a blocked attempt was harmless or whether unauthorized access reached sensitive assets.