Ransomware decryption
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Ransomware decryption
Disaster Scenario: The corporate intranet was attacked by a new variant of ransomware (Phobos variant). All design drawings, production data, supply chain documents, and financial systems were encrypted, and the attackers left a ransom note. Specifically, this included:
Core Assets: All CAD/CAM design drawings, 3D models, and process flow documents for dozens of products.
Operational Data: ERP system databases, MES production execution system data, supplier contracts, and quotations.
Confidential Information: Core technical patent documents, confidential communications, and agreements with overseas clients.
Backup Failure: The local backup server was also encrypted due to network mapping. The off-site backup was missing critical data from the last 3 days due to synchronization delays.
Recovery Challenges:
High Encryption Strength: The virus used a combination of high-strength asymmetric encryption (RSA) and symmetric encryption (AES). No public decryption tools were available.
Double Extortion Threat: The attackers also stole some sensitive design drawings, threatening to leak them if the ransom was not paid, creating immense pressure.
High Recovery Environment Requirements: Data analysis and recovery had to be conducted in an environment that did not trigger a secondary virus infection and was isolated from the internet.
Intense Business Interruption Pressure: The production line was completely shut down due to the inability to access drawings and process parameters, resulting in massive hourly losses.
Recovery Process:
Emergency Response and Isolation: Guided the client to immediately physically isolate the infected servers and backup devices, and captured virus samples for analysis.
In-depth Analysis and Decryption Attempt: Security engineers performed reverse engineering on the virus samples to search for encryption vulnerabilities. Simultaneously, professional tools were used to scan the patterns of encrypted files, looking for potential unencrypted "file fragments" that could be used for recovery.
Backup Data Salvage: Inspection of the local backup server revealed a time lag in the virus encryption process. Most of the incremental backup data that was not fully encrypted was successfully isolated and repaired from the backup chain.
Multi-path Recovery Parallel Processing:
Path 1 (Primary): Integrate and restore the repaired backup data.
Path 2 (Auxiliary): For the latest files unrecoverable from backups, perform low-level fragment reassembly and data carving to extract valid content.
Path 3 (Safety): Utilize virtualization technology within the isolated environment to set up a temporary business system and restore critical production data.
Comprehensive Security and Hardening: All recovery operations were conducted in an independent, isolated network environment. After recovery, a detailed attack forensic report and a comprehensive security hardening plan (including network segmentation, principle of least privilege, new backup strategies, etc.) were provided to the client.
Successful Outcome:
Core Data Recovery Rate: Successfully recovered over 95% of design drawings and production data, safeguarding core intellectual property.
Business Recovery: The production line resumed operations within 5 days, minimizing downtime losses.
Successful Ransomware Response: Refused to pay any ransom to the attackers by technically recovering the data. Simultaneously addressed the data leak threat through legal and technical means.
Security System Upgrade: Assisted the client in establishing a "3-2-1-1" gold standard backup strategy and a new generation Endpoint Detection and Response (EDR) system.
Total recovered data volume: approximately 18TB.
Recovery Time: 7 days (from emergency response to the restoration and deployment of core production data)
Client Testimonial: "When we saw all the screens turn into ransom notes, we were almost in despair. This experience was not just about data recovery, but also a profound security education. You not only helped us retrieve our data and protect our technical secrets, but more importantly, you rebuilt a stronger defense line. This value far exceeded our expectations."