Ransomware gero virus Decrypt
Gero Virus File (.gero Ransomware) - How to Remove It
Gero Virus Removal (+.Gero File Recovery) - Virus Removal

Gero can be correctly identify as a ransomware-type infection.

Ransomware is a kind of virus that crypted your documents and then forces you to pay to restore them. Note that DJVU (aka STOP) ransomware family was first revealed and analyzed by virus analyst Michael Gillespie1.
Gero is similar to other representatives of ransomware like: Gero, Hese, Hese. It crypted all common file types. Hence, users cannot work with the your documents or photos. Gero adds its own .gero extension into all files. For instance, the file video.avi, will be amended into video.avi.gero. As soon as the encryption is accomplished, Gero generates a special file _readme.txt and puts it into all folders that contain the modified files.
This text asking payment is for get files back via decryption key:

The scary alert demanding from users to pay the ransom to decrypt the encoded data contains these frustrating warnings
The cryptography algorithm used by Gero is AES-556. So, if your files got encrypted with a specific decryption key, which is totally distinct and there are no other copies. The sad reality is that it is impossible to restore the information without the unique key available.
In case if Gero worked in online mode, it is impossible for you to gain access to the AES-556 key. It is stored on a distant server owned by the frauds who promote the Gero infection.
For receiving decryption key the payment should be $980. To obtain the payment details the victims are encouraged by the message to contact the frauds by email ([email protected]), or via Telegram.

How I was infected?

Gero has a various methods to built into your system. But it doesnt really matter what method was used in your case.

Gero ransomware attack following a successful phishing attempt.

Nevertheless, these are the common leaks through which it may be injected into your PC:

  • hidden installation along with other apps, especially the utilities that work as freeware or shareware;
  • dubious link in spam emails leading to the Gero installer
  • online free hosting resources;
  • using illegal peer-to-peer (P2P) resources for downloading pirated software.

There were cases when the Gero virus was disguised as some legitimate tool, for example, in the messages demanding to initiate some unwanted software or browser updates. This is typically the way how some online frauds aim to force you into installing the Gero ransomware manually, by actually making you directly participate in this process.
Surely, the bogus update alert will not indicate that you are going to actually inject the Gero ransomware. This installation will be concealed under some alert mentioning that allegedly you should update Adobe Flash Player or some other dubious program whatsoever.

Of course, the cracked apps represent the damage too. Using P2P is both illegal and may result in the injection of serious malware, including the Gero ransomware.
To sum up, what can you do to avoid the injection of the Gero ransomware into your device? Even though there is no 100% guarantee to prevent your PC from getting damaged, there are certain tips I want to give you to prevent the Gero penetration. You must be cautious while installing free software today.
Make sure you always read what the installers offer in addition to the main free program. Stay away from opening dubious email attachments. Do not open files from the unknown addressees. Of course, your current security program must be always updated.
The malware does not speak openly about itself. It will not be mentioned in the list of your available programs. However, it will be masked under some malicious process running regularly in the background, starting from the moment when you launch your computer.

The message by the Gero ransomware states the following frustrating information:
Don't worry, you can return all your files!
All your files like photos, databases, documents and other important are encrypted with strongest encryption and unique key.
The only method of recovering files is to purchase decrypt tool and unique key for you.
This software will decrypt all your encrypted files.
What guarantees you have?
You can send one of your encrypted file from your PC and we decrypt it for free.
But we can decrypt only 1 file for free. File must not contain valuable information.
You can get and look video overview decrypt tool:
Price of private key and decrypt software is $980.
Discount 50% available if you contact us first 72 hours, that's price for you is $490.
Please note that you'll never restore your data without payment.
Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours.
To get this software you need write on our e-mail:
[email protected]
Reserve e-mail address to contact us:
[email protected]
Our Telegram account:
Mark Data Restore
Your personal ID:
The image below gives a clear vision of how the files with .gero extension look like:

Example of crypted .gero files

Do not pay for Gero!

Please, try to use the available backups, or STOPDecrypter tool
_readme.txt file also indicates that the computer owners must get in touch with the Gero representatives during 72 hours starting from the moment of files where crypted. On the condition of getting in touch within 72 hours users will be granted a 50% rebate, thus the ransom amount will be minimized down to $490). Yet, stay away from paying the ransom!
I definitely recommend that you do not contact these crooks and do not pay. The one of the most real working solution to recover the lost data just using the available backups, or use STOPDecrypter tool.
The peculiarity of all such viruses apply a similar set of actions for generating the unique decryption key to recover the ciphered data.
Thus, unless the ransomware is still under the stage of development or possesses with some hard-to-track flaws, manually recovering the ciphered data is a thing you cant really perform. The only solution to prevent the loss of your valuable data is to regularly make backups of your crucial files.
Note that even if you do maintain such backups regularly, they ought to be put into a specific location without loitering, not being connected to your main workstation.
For instance, the backup may be kept on the USB flash drive or some alternative external hard drive storage. Optionally, you may refer to the help of online (cloud) information storage.
Needless to mention, when you maintain your backup data on your common device, it may be similarly ciphered as well as other data.
For this reason, locating the backup on your main device is surely not a wise idea.

How to decrypt .gero files?

Encryption specialist Michael Gillespie (USA) managed to create his decoder for some versions and variants of this family ransomware (Gero, Hese, Hese, and others).
It work when the Gero virus used an offline key for encryption.
You can download free decryption tool here: STOPDecrypter. This tool includes a BruteForcer just for variants which use XOR encryption, a simple symmetric cipher that is relatively easy to break. The decrypter tool requires victims to provide an encrypted and original file pair greater than 150KB.

Download STOPDecrypter tool:

Extract STOPDecrypter tool to your Desktop folder:

Run STOPDecrypter tool:

Remember: STOPDecrypter should be run as an Administrator from the Desktop.

Select your folder and press Decrypt button:


Any files that are encrypted with STOP (DJVU) Ransomware will have the
.STOP, .SUSPENDED, .WAITING, .PAUSA, .CONTACTUS, .DATASTOP, .STOPDATA, .KEYPASS, .WHY, .SAVEfiles, .DATAWAIT, .INFOWAIT, .puma, .pumax, .pumas, .shadow, .djvu, .djvuu, .udjvu, .djvuq, .uudjvu, .djvus, .djvur, .djvut .pdff, .tro, .tfude, .tfudeq, .tfudet, .rumba, .adobe, .adobee, .blower, .promos, .promoz, .promock, .promoks, .promorad, .promorad2, .kroput, .kroput1, .charck, .pulsar1, .klope, .kropun, .charcl, .doples, .luces, .luceq, .chech, .proden, .drume, .tronas, .trosak, .grovas, .grovat, .roland, .refols, .raldug, .etols, .guvara, .browec, .norvas, .moresa, .verasto, .hrosas, .kiratos, .todarius, .hofos, .roldat, .dutan, .sarut, .fedasot, .forasom, .berost, .fordan, .codnat, .codnat1, .bufas, .dotmap, .radman, .ferosas, .rectot, .skymap, .mogera, .rezuc, .stone, .redmat, .lanset, .davda, .poret, .pidon, .heroset, .myskle, .boston, .muslat, .gerosan, ,vesad, .horon, .neras, .truke, .dalle, .lotep, .nusar, .litar, .besub, .cezor, .lokas, .godes, .budak, .vusad, .herad, .berosuce, .gehad, .gusau, .madek, .tocue, .darus, .lapoi, .todar, .dodoc, .bopador, .novasof, .ntuseg, .ndarod, .access, .format, .nelasod, .mogranos, .cosakos, .nvetud, .lotej, .kovasoh, prandel, .zatrov, .masok, .brusaf, londec, .krusop, .mtogas, .coharos, .nasoh, .nacro, .pedro, .nuksus, .vesrato, .masodas,.stare, .cetori, .carote, .gero or .hese extensions appended to the end of the encrypted data filename as explained here by Amigo-A (Andrew Ivanov).
Please read the first page of the STOP Ransomware (.STOP, .Puma, .Djvu, .Promo, .Drume) Support Topic for a summary of this infection, it's variants, any updates and possible decryption solutions with instructions (including what to do if the decrypter does not work).

You need to post any questions or the required information
(i.e. Personal ID, Extension of files & MAC (physical) Address of the infected computer) in the above support topic.
If STOPDecrypter cannot decrypt your files...For archiving purposes, the tool's developer, Demonslay335 (Michael Gillespie), will need you to provide the following three items preferably as given by the STOPDecrypter-log.txt in case a future solution becomes available:

  • Personal ID (preferably from the ransom note, but can also be given by STOPDecrypter if it skipped files).
  • Extension of files.
  • MAC (physical) Address(es) of network device (network card, Wired, Wireless, Wi-Fi) of the infected computer, again preferably as given by STOPDecrypter.

should i keep encrypted files on my pc?

You can keep the encrypted files on your PC, or archive them to an external HD awaiting a solution. The files themselves are safe, they are encrypted not infected.
You should run a complete scan with an up-to-date AV on the PC that was infected, along with Malwarebytes and Hitman Pro (free and trial versions are in the Bleeping Computer download section).
Make sure you save a copy of the ransom note - might come in handy later.