Claude Opus 4.7 in Real Incident Response: Solo Closing a Healthcare Malware Breach in 5 Hours

A Reddit user (u/reddited-autist) documented using Claude Opus 4.7 to handle a real malware incident at a 60-person psychology practice. The attacker compromised patient records spanning 11 years (HIPAA-protected), stole session cookies, and bypassed 2FA via social engineering through a fake LinkedIn HR page. The malware was a Python bytecode RAT (compiled .pyc) that used the obsolete finger protocol for C2 to bypass firewalls, plus WebSocket C2 with disabled certificate validation. Traditional IR costs $30-100K and requires a 3-6 person team for a week; the author closed it solo in 5 hours.

Where Claude Pulled Real Weight

• Reverse-engineering the bytecode: Dropped the .pyc into Claude; it walked through dis output, identified obfuscation patterns, and extracted C2 endpoints faster than the author would have solo. The key was inferring intent from call patterns.
• HIPAA risk-assessment doc: Boilerplate-heavy regulatory work normally taking 4 hours — Claude drafted it in 15 minutes from findings. The author edited rather than wrote.
• 12 reusable forensic scripts: Described requirements, Claude wrote them, author tested and corrected. Most are now in his standard kit.

Where the Author Had to Override

• Over-attribution: Claude attributed the attack to a sophisticated state-level actor. The C2 was leaky, obfuscation middling — corrected in final report.
• Missed cookie persistence: Needed pointing to the specific file path before Claude caught the registry key. Lesson: don't trust it to find what you didn't tell it to look for.
• Dangerous remediation step: Generated a step that would have broken the practice's EHR integration. Caught on review — blind execution would have made things worse.

Honest Takeaway

The author's summary: "Working with Claude is not 'Claude does the work.' It's a dialogue where I bring 20 years of security judgment and Claude brings throughput and pattern recall." The model didn't replace him — it enabled solo work that previously required an entire firm. For regulated industries, this changes IR cost structure so small practices can afford proper breach closure instead of becoming HIPAA headlines.

Full technical writeup with malware breakdown linked in source.