WordPress Backdoor Rebuilds Itself After Cleanup Using Files, Database, and Shared Memory

A highly sophisticated WordPress backdoor dubbed 'SC' uses a multi-layered 'self-healing mesh' that persists across files, the database, and RAM-based shared memory segments simultaneously. Traditional remediation approaches—such as deleting infected files—are rendered ineffective because any surviving component can silently reconstruct the others. This matters because defenders may believe a system is clean after partial removal, while the attacker retains full access. The use of shared memory as a persistence vector is particularly concerning as it survives file scans but not reboots, highlighting how attackers now exploit overlooked system layers. Thorough eradication requires understanding all persistence mechanisms before any cleanup action is taken.