At Coventry Data Recovery, we specialise in disaster recovery ransomware services, offering advanced forensic-level support to decrypt, analyse and recover data from ransomware-infected devices. With 25 years of experience, we handle ransomware cases from all industries including finance, healthcare, manufacturing, education, and legal sectors.
Whether your data is encrypted on a single laptop or across a multi-disk RAID server, our forensic team has the tools and expertise to help recover encrypted files and restore business-critical systems.
💼 Ransomware Recovery Services Offered
We offer decryption and forensic recovery services for the following systems:
- Laptops and Desktops (Windows, macOS, Linux)
- External Hard Drives and USB Media
- RAID Servers (RAID 0, 1, 5, 6, 10, NAS, SAN)
- Virtual Machines (VHD, VHDX, VMDK)
- Encrypted File Shares and Backup Systems
- Enterprise Mail Servers and File Servers
🔒 Ransomware Types We Recover From
We have recovered data from clients hit by:
- LockBit
- WannaCry
- REvil (Sodinokibi)
- DarkSide
- BlackMatter
- Dharma
- Conti
- Maze
- Ryuk
- STOP Djvu
- CryptoLocker
- GlobeImposter
…and many others
🧪 Top 25 Ransomware Decryption Techniques – Explained Technically
Each case is approached with forensic methodology. Below are 25 professional techniques used to recover encrypted or inaccessible data:
1. Ransomware Identification
Using byte-level entropy analysis, we determine the encryption algorithm and strain. This allows for targeted decryption strategies and risk profiling.
2. Known Decryptor Utilisation
For known ransomware variants with public decryption keys, we use reverse-engineered decryptor tools to safely unlock files without altering metadata.
3. Partial Encryption Analysis
Many strains only encrypt the first N kilobytes of a file. We extract the unencrypted tails and headers, then reassemble functional files where possible.
4. Encrypted File Pattern Detection
We analyse file suffixes and entropy levels to identify partial vs full encryption. Header verification is used to restore certain media/document types.
5. Shadow Copy Restoration
If ransomware has not deleted shadow copies, we mount and extract Volume Shadow Service (VSS) backups using forensic tools without booting the OS.
6. Data Carving from Unallocated Space
Using low-level scanning and signature analysis, we recover deleted and overwritten pre-encryption versions from slack space or raw sectors.
7. Manual Key Discovery
For poorly implemented cryptography (e.g., weak AES key storage in memory), we perform live memory dumps and scan for symmetric key patterns.
8. Brute Force Decryption with GPU Acceleration
When passwords or keys follow predictable patterns, we use distributed brute force methods (via CUDA/OpenCL) to accelerate decryption of small file sets.
9. Entropy-Based File Type Reconstruction
Files like JPEG, PDF, and DOCX have identifiable headers and footers. Even in encrypted format, partial structure enables us to reconstruct data fragments.
10. Forensic Disk Imaging
We clone all infected storage to create a bit-perfect image before attempting any modifications. This preserves evidence and allows multiple recovery attempts.
11. Isolated Live Environment Extraction
Using a forensic Linux boot image, we access drives without triggering further encryption or malware propagation.
12. Rebuilding Master File Table (MFT)
If ransomware corrupts or deletes the MFT, we rebuild the NTFS file system structure from backup MFT entries or journaling data.
13. Alternate Data Stream Recovery
Some ransomware stores keys or command logs in NTFS alternate streams. We scan and extract for post-attack analysis or rollback.
14. Block-Level File Comparison
Where partial backups exist, we compare encrypted versions against previous versions at block level to identify XOR masks or repeating patterns.
15. Decryption via Metadata Analysis
Certain ransomware leaves file creation/modification timestamps intact. We use these clues to build recovery timelines and prioritise essential files.
16. File Fragment Stitching
When encrypted files are corrupted or incomplete, we combine readable fragments from multiple sectors or partitions to form recoverable partial documents.
17. RAID Reconstruction
For RAID arrays affected by ransomware and simultaneous disk failure, we reconstruct the RAID manually (using parity calculations) to access encrypted data.
18. Virtual Machine Mounting
We extract VHD/VHDX or VMDK files from infected servers and mount them in controlled environments for non-destructive analysis and recovery.
19. Ransom Note Parsing for Key Hints
Some ransomware embeds recovery hints in ransom notes (e.g. test file decryption). We exploit these to reverse-engineer partial decryption routines.
20. Malware Emulator Testing
We run the ransomware sample in a sandboxed virtual machine to observe key exchange, encryption logic, and behavioural fingerprints.
21. Process Memory Extraction
During active infection, encryption keys are held in RAM. We analyse hibernation files, pagefiles, and crash dumps for recoverable keys.
22. Registry & Key Vault Analysis
Some ransomware stores configuration or keys in the Windows registry. We extract and decode these using forensic tools.
23. File System Journal Recovery
We use NTFS or ext3/ext4 journaling data to roll back file system changes introduced by ransomware, including deletions and renames.
24. Network Share Isolation & Deep Copy
When ransomware spreads across mapped drives, we isolate segments and perform sector-level recovery before encryption could fully propagate.
25. Negotiation Support & Legal Guidance
In rare cases where no decryption method is technically possible, we offer consultation on ransom negotiation, cryptocurrency handling, and regulatory implications.
🖥️ Supported Platforms
- Windows: XP through to Windows 11
- macOS: All versions including Ventura, Monterey, Big Sur
- Linux: Ubuntu, Debian, CentOS, RedHat, Fedora
- Virtual Environments: Hyper-V, VMware, VirtualBox
- Storage Types: SSD, HDD, USB, RAID, NAS, SAN, LTO Tape
🔐 Why Choose Coventry Data Recovery?
- 25 Years of Digital Forensics & Ransomware Recovery Experience
- Forensic Lab & Evidence Handling Procedures
- Support for over 200+ ransomware strains
- GDPR-Compliant & Chain-of-Custody Maintained
- Emergency Response Available (48-Hour Critical Service)
Our forensic team has helped small businesses, NHS trusts, law firms, schools, and private individuals recover irreplaceable encrypted data under the most time-sensitive conditions.
📞 Get Expert Help Today
If your systems have been locked or your data encrypted by ransomware, time is critical. Stop all activity immediately and contact our ransomware specialists.
Call Coventry Data Recovery today for a FREE diagnostic and secure recovery consultation.