This South Yorkshire office had its house largely in order. "Our office network was infected with ransomware a few weeks ago", and "We were able to recover all our main data via a backup system" — yet "the drive on one pc has been encrypted", and that machine holds mail which never lived on the servers. Their request is narrow and sensible — "recover at least the e-mails from this drive" — an Outlook store on a drive now pulled from the PC. Ransomware encryption isn't a recovery problem in the usual sense: the data is intact but mathematically sealed, so the case turns on which of three genuine routes reaches that Outlook file — and on being straight that brute force is not one of them.
| Media | Single desktop drive encrypted by ransomware, removed from its PC — the wider network restored from backup, this machine's local Outlook data store the outstanding loss |
| Reported situation | Network-wide ransomware infection weeks prior · main data successfully restored from a backup system · one PC's drive left encrypted and unrestored · Outlook mailbox the recovery priority · drive isolated from the machine and available for examination |
| Fault class | Malicious file encryption on an otherwise healthy drive — recovery contingent on shadow copies, incompletely encrypted regions, or a known flaw in the specific ransomware family, never on defeating sound cryptography |
| Equipment used | Drive imaged under a hardware write-blocker before anything, preserving the crime scene exactly · ransomware family identified from encrypted extensions, ransom note and file headers · Volume Shadow Copy remnants and unallocated space swept in X-Ways Forensics for pre-encryption versions · partially-encrypted files examined at hex level, since many strains encrypt only a file's opening portion · Outlook store parsed and mail extracted from any clean copy found, integrity verified |
Modern ransomware uses the same cryptography that protects banks, and that fact sets the honest boundary. Where a strain is implemented correctly, encrypted files cannot be reversed without the criminals' key — no laboratory, and no amount of computing, brute-forces it. Any service promising guaranteed decryption of arbitrary ransomware is selling a fiction, and the first duty here is to say so plainly.
What a laboratory legitimately does is exploit the gaps, not the mathematics. Real recoveries in these cases come from three places: shadow copies the malware failed to purge, files it encrypted only partially, and implementation flaws in specific families that researchers have already broken. None of these attacks the cipher — they find the data the encryption missed, or the mistakes its authors made.
The single-drive Outlook store is a genuinely favourable target. Many strains encrypt only the first portion of each file for speed — enough to make it unusable, but leaving the bulk of a large file untouched. An Outlook data store is typically very large, so a partial-encryption strain may have sealed only its opening while the mail archive beyond survives in the clear, extractable message by message.
Identifying the family is the step that decides the odds. The encrypted file extensions, the ransom note's wording, and the byte patterns at file headers fingerprint the strain — and public research databases record which families were poorly built or have had keys released. That the network backups restored cleanly is separately useful: it may mean this machine holds the only unique data, which focuses the whole effort on one file.
Imaging first preserves options that a repair attempt would burn. Everything is done against a write-blocked image so the encrypted originals stay pristine — decryption tools, if a family break exists, get applied to copies, and nothing forecloses a future solution should keys for that strain surface later. Running decryptors or cleaners on the live drive is how partial recoveries become total losses.
The honest range is stated before work, not after. Best case, shadow copies or partial encryption return the mail intact. Worst case, a correctly-implemented strain with no shadow copies leaves it sealed, and the answer is that the emails are beyond reach — delivered as a finding, not discovered by the customer after a bill.
The drive was imaged under a hardware write-blocker, preserving the encrypted state exactly. The ransomware family was identified from extensions, note and headers and checked against public research. Shadow copy remnants and unallocated space were swept in X-Ways Forensics for pre-encryption versions, partially-encrypted files examined at hex level for surviving bodies, and the Outlook store parsed and mail extracted from the cleanest copy located, with integrity verified.
Crime scene imaged, strain fingerprinted, shadow copies and partial-encryption remnants swept, and the mail recovered from what the encryption missed. Free assessment, one fixed written figure including VAT; where recovery is not possible, nothing is charged. The decode: ransomware seals data with real cryptography, so nobody honest promises to break it. The recovery lives in the gaps — the shadow copy it forgot, the file it only half-sealed, the flaw its authors left — and your large Outlook file is exactly where those gaps tend to pay off.
Isolate the drive and stop using it — don't run decryptors, cleaners or recovery tools against the original, because they destroy the shadow copies and partial-encryption remnants that are your real chance. Never pay for a service guaranteeing to break the encryption; sound ransomware cannot be brute-forced, and the honest work is finding what it missed. Preserve the ransom note and a sample encrypted file for family identification, and keep the drive as-is on the chance keys for that strain are released later.
Our case files are written up from genuine enquiries our lab has handled for customers across Sheffield and South Yorkshire, anonymised to protect client confidentiality. Each one describes the diagnostic and recovery approach our engineers apply to that fault, using the equipment listed.
Free diagnostic, fixed quote, no fix no fee — start now or call the freephone.