Encryption and Corrupt File Recovery

File cannot be opened, become garbled, suffix is changed, Office tips damaged, compressed package password forgotten--damaged and encrypted are two types of problems, the processing route is completely different. We first identify, then determine the plan, can save the save, cannot save tell you why.

First distinguish Corrupted file repair Extortion of encrypted files real case price reference FAQ

First of all, it is important to know whether your file is "corrupted" or "encrypted".

Many people confuse the two types of problems, and they are actually handled in completely different ways:

damage class: The file structure is bad, but the content is still clear. Performance: Word/Excel open prompt "content problem", picture open half, video only sound no image, RAR/ZIP prompt CRC error. Cause: transmission interruption, disk bad sectors, writing during power failure.This repair has a high success rate.Because the data is still there, only the "directory page" is rotten.
Encryption (ransomware): File content is encrypted by algorithm, structure is intact but all ciphertext. Performance: suffix is changed to strange format, blackmail description txt appears, all types of files cannot be opened at the same time.This type should be handled separately by virus familySome have free decryption tools, some can only rely on backup or bottom residue recovery.
Password Forgotten Class: Forgot your own password (Office document password, compressed package password, BitLocker recovery key lost). Legal file to recover access rights, according to the difficulty charge.

Not sure what kind? Send us the file (or screenshot error message),free identificationFive minutes to answer.

Corrupt file repair: special channel by file type

Different formats of "damage" repair methods are different, and we have accumulated special processes by type:

Office documentation (doc/xls/ppt): Office files are compressed package structure, most of the "damage" is a node break in the internal XML. Decompress → locate bad nodes → repair XML tree → reorganize. The probability that the text can be saved is very high, and complex formats (nested tables, charts) may be degraded.
Database class (mdf/dbf/financial account set): Take database recovery dedicated line, see detailsDatabase recoveryfor more information.
Image (jpg/png): JPG MCU scan data on the head and tail dependence is small, head bad can be reconstructed with the same camera sample; photo files We have saved a large number of "cannot open but preview thumbnail" cases-thumbnail in the description of the data body is still in.
Video (mp4/mov): Moov atom (index) loss is the most common damage, with the same equipment shot normal video as a reference reconstruction index, picture data intact can be recovered.
Zip/rarCRC error can be repaired block by block; partial volume missing volume can be supplemented.
CAD drawings (dwg): Version downgrade repair + backup file (.bak/.dwl) mining, design institute customer high frequency demand.

Extortion encrypted files: three routes, go free first

The ransomware encryption file, we try in this order:

Route 1·Official decryption tool: Compare the ransomware description + sample file to the virus family library (No More Ransom, ID Ransomware). Historically, many popular families (some Phobos, GlobeImposter, CrySiS variants, etc.) have free decryptors released by security companies.If you can solve it for free, we won't let you spend money wrongly.
Route 2: Backup and Residual VersionNAS snapshot, cloud disk history version, Windows shadow copy, browser cache copy, WeChat/email transfer copy-dig all the "second place where data may exist". Many customers think "no backup", but in fact they can recover most of it.
Route 3: Bottom Data Residue Recovery: Encryption is "read original file → write ciphertext → delete original file", deleted original data often remains on disk (especially mechanical hard drive and large files). Full bottom scan to retrieve uncovered original version. SSD with TRIM enabled will be more difficult, but the success rate of enterprise scenarios is still considerable.

If you can't save all three routes, we will tell you the truth and help you block the "entrance"(how to poison) to prevent secondary poisoning.It is your decision whether to pay the ransom or not, and our advice is always based on family intelligence: about a quarter of the time you don't get your data back.

⚠️ The golden rule for corrupted/encrypted files:If you find that the file cannot be opened, immediately stop writing anything to that disk (including "try another software to open"-some software will generate temporary files to overwrite the residual data). SSD users should pay special attention to TRIM, which will erase deleted data when idle, and may keep the residual data when idle without power. Contact us as soon as possible to guide you remotely on what steps to do first.

real case

This is how we help our clients solve problems.

Engineering company more than 200 CAD drawings cannot be opened, bad sectors caused, 98% rescue

In April 2026, a designer of an electromechanical engineering company in Shiqiao reported that more than 200 dwg drawings in the project folder could not be opened one after another, prompting "invalid graphic files". Check the hard drive: SMART shows more than 300 remapped sectors, bad sectors are spreading.(It is still in use, and the file may be heavier every time it is opened). Processing: immediately stop using → full read-only mirror → batch processing with CAD repair tools on the mirror + cross recovery from the. bak backup file in the drawing directory → 210 of 214 drawings were rescued, 4 of which were too damaged for the design institute to retrieve 2 from Party A's emails, and 2 old versions were actually lost. The hard drive was rejected and replaced on the spot. Cost: RMB 1800 for data recovery. Their director said,"That's 1800 times cheaper than painting 200 new pictures."

Mobile phone shot of the child's birthday party video "damaged", moov index reconstruction rescue

In July 2026, a customer took a video of his birthday party on his iPhone.(More than 40 minutes, a unique souvenir) After transmitting to the computer, it can't be opened. QuickTime prompts "Not a valid video file". Reason: The data line is loose during transmission, and the moov index of mp4 is not finished--the picture data is actually all there. Use another normal video taken on her mobile phone on the same day as the reference to reconstruct the index. The video is completely restored. There are many frames in 40 minutes. The charge is RMB 300. This type of "transmission interruption corruption" is the most frequent data problem for home users, and the processing ideas are similar: find normal samples of the same device and rebuild the index structure.

price reference

Test first, quote later, repair later

Item	Reference Price	Notes
damage evaluation	free of charge	Send a file or screenshot to report an error
Office/CAD/Photo Repair	RMB 200–800 per batch	By Number of Files and Degree of Damage
Video index reconstruction	RMB 300–1000	By video duration and format
Archive Repair	RMB 100–500	CRC Repair/Rewinding
Office/zip code recovery	RMB 200–1500	According to encryption strength, document ownership shall be proved.
Extortion file decryption assessment	free of charge	Family identification + salvability judgment
Extortion Data Recovery	by assessment	Pricing after all three routes have been completed

* The above is the reference price, the specific price after inspection/survey shall prevail; batch/enterprise customers can negotiate discounts. Final pricing is subject to the actual on-site inspection.

FAQ

About encryption and damaged file recovery, we are often asked

How do I know if my files are saved?

Free identification. Send the damaged file (or blackmail description + a sample) to our WeChat/email address. We will give you a conclusion within 5-30 minutes: what kind of problem, approximate success rate, cost range. Identification is free of money, repair or not.

What's the recovery rate?

Corrupted: structurally damaged but data present, 80-95%; encrypted: depending on virus family and disk type, families with free decryptor close to 100%, no go residual recovery about 30-70%. We will give you an honest range when evaluating, do not blow "100% recovery".

Do I need proof that the documents are mine?

Password recovery business needs (anti-dispute), we require file ownership description, enterprise documents need to be stamped or confirmed by the person in charge. Damage repair and extortion recovery are not required.

How can I give you the documents?

Yes. Small files are sent directly by WeChat/email; large files or the whole disk are restored, and SF will send them to us (we will identify them before starting work after signing, and there will be registration throughout the process). Local customers in Nansha, Panyu are welcome to go directly to the store.