Lawful Web-Shell Removal Audit Record

PROBLEM: On April 13, 2021, the Justice Department announced a court-authorized FBI operation to copy and remove malicious web shells from hundreds of computers in the United States running on-premises Microsoft Exchange Server, exploited through the ProxyLogon zero-days. A Texas court authorized access for 14 days from April 9. The FBI issued a command through each web shell that caused the server to delete only the web shell, identified by its unique file path — then notified the system owners. The operation did not patch the vulnerabilities or remove other malware. This is the documented precedent for court-authorized remote remediation of victim systems: the lawful version of taking down a hostile server-side implant. But the warrant, its scope, and its limits live in redacted court documents — there is no standing audit record for when a court authorizes this kind of removal and what it forbids.

SOLUTION: A lawful web-shell removal audit record: every court-authorized remote remediation logged with its warrant scope and duration, the implants removed, what was deliberately left untouched, and the victim notifications that followed — so a lawful removal is auditable, and an unlawful one has a record to be measured against.

EVIDENCE BASIS: DOCUMENTED — DOJ press release 21-319, Apr 13, 2021; court order (S.D. Tex.), 14 days from Apr 9, 2021; hundreds of Exchange servers; removal by command through the web shell, deleting only the shell by file path; owners notified afterwards; vulnerabilities not patched, other malware not removed. Sources: DOJ; TechCrunch, Apr 13, 2021; The Register, Apr 14, 2021.