What is Ogdo file extension
.Ogdo file extension is an identifier that is appended to the names of the files that have been encrypted by the Ogdo ransomware virus. The Ogdo ransomware is a new malware that belongs to the STOP (Djvu) ransomware family. It encrypts the victim’s files, changes the names of the affected files, appending .ogdo extension to their name, creates a file called “_readme.txt” with a ransom demand message. After the files are encrypted, their contents become inaccessible. The Ogdo authors demand to pay the ransom in exchange for the key and the decryptor necessary for decrypting the files. Fortunately, there is a free Ogdo File Decrypt Tool and several other alternative methods that can help the ransomware victims decrypt .ogdo files and restore the encrypted files to their original state.
Ransomware is one of the most dangerous types of computer viruses. What is characteristic of these viruses is that they stealthily encrypt files of the victim without giving themselves away. Most often, the victim does not notice the activity of a virus that encrypts files. Only when all the files are encrypted, it becomes clear that the computer was the victim of a ransomware attack. If you encounter such a situation, your computer was infected with the ransomware, and your files are encrypted with the .ogdo file extension, know that we created this article for you and other people faced with the same problem. This article contains a guide with important information about Ogdo ransomware, how it functions, how to remove the ransomware from a computer. But more importantly, this article contains detailed instructions with information on how to decrypt .ogdo files, as well as what other methods exist to restore encrypted files without paying a ransom to criminals.
What is Ogdo ransomware
Ogdo ransomware is a malware that was created to encrypt files located on the victim’s computer, and then extort money to decrypt them. Ogdo virus sneaks into the system without any visible symptoms, which is why users notice that their computer is infected too late, when the files are already encrypted.
Typically, ransomware like Ogdo can infect a computer when installing programs downloaded from torrent web-sites as well as when running cracked games, freeware, key generators and other similar software. Upon execution, the virus creates a directory in the Windows system directory, copies itself to this directory, changes some OS settings, and also collects information about the infected computer. After that, Ogdo virus tries to connect to its command server. If this succeeds, the virus sends data on the infected computer to the server, and from it receives a key (so-called ‘online key’) necessary for file encryption. If the connection to the command server has not been established, then the virus uses a fixed key (so-called ‘offline key’).
The main difference between an online key and an offline key is that the online key is in the hands of criminals and cannot be determined. The offline key is fixed and can be determined by security researchers. This gives hope that the ransomware victims will be able to decrypt files without paying ransom.
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As we said, ‘Ogdo file’ is an encrypted file. To decrypt it, you must use the key and the decryptor. This is reported by the authors of Ogdo virus, in a message that they leave on the infected computer. This message is in a file called ‘_readme.txt’. The criminals place such a file in every directory where there is at least one encrypted file. An example of the contents of this file is given below.
The contents of this file are a ransom demand message. Criminals report that all files on the computer are encrypted, and only the key and decryptor can decrypt these files and restore access to their contents. Attackers demand a ransom of $980 in exchange for a key and a decryptor. If the victim is ready to pay the ransom quickly, within 72 hours, the size of the ransom is halved to $490. The authors of the virus offer to decrypt one Ogdo file for free and thus prove the possibility that the files can be decrypted.
|Name||Ogdo ransomware, Ogdo file virus|
|Type||Crypto malware, Filecoder, File locker, Crypto virus, Ransomware|
|Encrypted files extension||.ogdo|
|Ransom amount||$980, $490 in Bitcoins|
|Detection Names||Hacktool.Win32.Shellcode.3!c, Malware/Win32.Generic.C4194923, Trojan.GenericKDZ.69981, W32/Kryptik.BWP.gen!Eldorado, Trojan.DownLoader34.38299, Trojan.TR/AD.InstaBot.BT, Exploit.Win32.Shellcode.tum, Trojan.Glupteba, Ransom:Win32/STOP.BS!MTB|
|Symptoms||Unable to open files. Files are encrypted with a .ogdo file extension. Files called like ‘_readme.txt’, ‘READ-ME’, ‘_open me’, _DECRYPT YOUR FILES’ or ‘_Your files have been encrypted” in every folder with an encrypted file. Ransom note in a pop-up window with cybercriminal’s ransom demand and instructions.|
|Distribution methods||Malicious e-mail spam. Malicious downloads that happen without a user’s knowledge when they visit a compromised web page. Social media posts (they can be used to entice users to download malware with a built-in ransomware downloader or click a suspicious link). USB sticks containing malicious software.|
|Removal||Ogdo ransomware removal guide|
|Decryption||Ogdo File Decrypt Tool|
|Recovery||Ogdo File Recovery steps|
How to remove Ogdo ransomware, Recover, Decrypt .ogdo files
Security researchers confirm that files with .ogdo extension are encrypted and to decrypt them you need to use a key and special software – decryptor. Fortunately there is a Ogdo File Decypt Tool which was created by Emsisoft and named Stop (djvu) decryptor. This tool allows everyone to decrypt .ogdo files completely free. Unfortunately, this decryptor is limited in that it can only decrypt files encrypted with an offline key, files encrypted with an online key cannot yet be decrypted. The reason for this is that only the Ogdo ransomware creators have the online key and this key cannot be determined or cracked. In addition to using the Ogdo File Decypt Tool from Emsisoft, there are several other ways to restore the content of encrypted files.
The instructions below detail how to remove Ogdo ransomware virus, decrypt .ogdo files, and also how to recover encrypted files if the free Ogdo File Decypt Tool could not decrypt them. Read the entire manual carefully. To make it easier for you to follow the instructions, we recommend that you print it or open it on your smartphone.
- How to remove Ogdo ransomware virus
- How to decrypt .ogdo files
- How to restore .ogdo files
- How to protect your PC from Ogdo ransomware
How to remove Ogdo ransomware virus
Before you start decrypting or recovering .ogdo files, you need to remove Ogdo ransomware and its autostart entries. This must be done since otherwise the ransomware may re-encrypt the restored files. You can stop the ransomware from working, as it is not difficult to do. Another option is to perform a full system scan using free malware removal tools capable of detecting and removing ransomware infection.
It is very important to scan the computer for malware, as security researchers found that spyware could be installed on the infected computer along with the Ogdo ransomware. Spyware is a very dangerous security threat as it is designed to steal the user’s personal information such as passwords, logins, contact details, etc. If you have any difficulty removing the Ogdo virus, then let us know in the comments, we will try to help you.
To remove Ogdo ransomware, follow the steps below:
- Kill the Ogdo ransomware process
- Disable the Ogdo ransomware Start-Up
- Delete the Ogdo ransomware Task
- Delete the Ogdo ransomware File
- Scan computer for malware
Kill the Ogdo ransomware process
Press CTRL, ALT, DEL keys together.
Click Task Manager. Select the “Processes” tab, look for something suspicious that is the Ogdo ransomware then right-click it and select “End Task” or “End Process” option. If your Task Manager does not open or the Windows reports “Task manager has been disabled by your administrator”, then follow the guide: How to Fix Task manager has been disabled by your administrator.
It is not difficult to detect a process related to the Ogdo ransomware. When looking for a malicious process, pay attention to the process icon and its name. Most often, this ransomware has a process name in the following format: 4-characters.tmp.exe or 4-characters.exe. For example: 7533.tmp.exe, A4b1.exe, CD15.tmp.exe, 19b2.exe. If you do not find a process with a similar name in the list of processes, then most likely the Ogdo ransomware has finished working. But keep in mind, if you do not remove the ransomware autostart entries, as demonstrated below, and do not delete its file, then after a while it may start again, and if it finds unencrypted files, immediately encrypt them.
Disable the Ogdo ransomware Start-Up
Select the “Start-Up” tab, look for something similar to the one shown in the example below, right click to it and select Disable.
Close Task Manager.
Delete the Ogdo ransomware Task
Type “Task Scheduler” in the search bar. Click Task Scheduler app in the search results. Click “Task Scheduler Library” in the left panel. On the right panel, right-click to “Time Trigger Task” and select Delete.
Close Task Scheduler.
Delete the Ogdo ransomware File
Run Task Manager and select the “Start-Up” tab. Right click to the Ogdo ransomware Start-Up entry and select Open File Location as shown below.
A directory containing one file will open in front of you, this file is the Ogdo ransomware. It needs to be removed. If you try to delete it immediately, then you will not succeed, since this file is protected from deletion.
To delete this file, you need to do the following. Right-click on the file, select Properties. In the window that opens, select Security tab. Next, click the Advanced button below. A window will open as shown in the following example.
Click Disable inheritance. In the Block inheritance dialog box that opens, select the first item (Convert inherited permissions…) as shown below.
In the Permission entries list, select “Deny Everyone”, click Remove button and then OK. Close the file properties window. You should now be able to remove the Ogdo ransomware File. Right-click on the file and select Delete.
Scan computer for malware
Zemana AntiMalware is a malware scanner that is very effective for detecting and deleting Ogdo ransomware virus. The steps below will explain how to download, install, and use Zemana Free to scan your personal computer and remove ransomware, worms, spyware, adware, trojans, malicious software for free.
Download Zemana on your Microsoft Windows Desktop by clicking on the link below.
Author: Zemana Ltd
Category: Security tools
Update: July 16, 2019
After downloading is finished, start it and follow the prompts. Once installed, the Zemana Anti Malware will try to update itself and when this task is complete, click the “Scan” button . Zemana Free tool will start scanning the whole PC system to find out Ogdo crypto virus, other malware, worms and trojans.
This procedure may take some time, so please be patient. When a threat is detected, the number of the security threats will change accordingly. Once you have selected what you want to remove from your computer click “Next” button.
The Zemana will remove Ogdo ransomware related folders,files and registry keys.
In order to be 100% sure that the computer no longer has the Ogdo malware, we recommend using the Kaspersky virus removal tool (KVRT). This utility, as its name suggests, is developed by the Kaspersky lab and uses the core of the Kaspersky Antivirus. Unlike the Kaspersky Antivirus, KVRT has a smaller size and, most importantly, it can work together with an already installed anti-virus. This tool has great capabilities and therefore we suggest using KVRT in the last turn to be sure that the Ogdo ransomware has been removed.
Download Kaspersky virus removal tool (KVRT) by clicking on the following link.
Author: Kaspersky® lab
Category: Security tools
Update: March 5, 2018
After the download is finished, double-click on the Kaspersky virus removal tool icon. Once initialization procedure is finished, you will see the KVRT screen as shown below.
Click Change Parameters and set a check near all your drives. Click OK to close the Parameters window. Next click Start scan button for checking your PC for the Ogdo crypto virus . This task can take some time, so please be patient. While the Kaspersky virus removal tool is checking, you can see how many objects it has identified either as being malicious software.
Once that process is complete, you can check all items detected on your system as shown in the following example.
Make sure to check mark the threats that are unsafe and then click on Continue to start a cleaning procedure.
How to decrypt .ogdo files
All files with .ogdo extension are encrypted and the only way to access their contents is to decrypt them. To decrypt .ogdo files, you need to use a unique key and the Ogdo File Decypt Tool. As we said above, Emsisoft company was able to create a decryptor and found a way in some cases to determine the key that was used to encrypt the files. This allows victims of the virus to decrypt .ogdo files for free.
To decrypt .ogdo files, use free Ogdo File Decypt Tool
- Download Ogdo File Decypt Tool from the following link.
STOP Djvu decryptor
- Scroll down to ‘New Djvu ransomware’ section.
- Click the download link and save the decrypt_STOPDjvu.exe file to your desktop.
- Run decrypt_STOPDjvu.exe, read the license terms and instructions.
- On the ‘Decryptor’ tab, using the ‘Add a folder’ button, add the directory or disk where the encrypted files are located.
- Click the ‘Decrypt’ button.
Ogdo File Decypt Tool is a free software that can decrypt files that were encrypted with an offline key, as Emsisoft found a way to determine this key. Unfortunately, files encrypted with an online key cannot yet be decrypted. The online key is unique to each infected computer, and at the moment there is no way to find this key. Of course, criminals have this key, but we do not think that paying a ransom is a way to decrypt .ogdo files. In the case when the files are encrypted with an online key, there is a chance to restore the encrypted files using alternative methods, which are described below.
How to find out which key was used to encrypt files
Below we will demonstrate how to find out the type of key with which files were encrypted. This is very important, since knowing the type of key you can understand if you can decrypt .ogdo files for free using the Ogdo File Decypt Tool. We recommend using the second method, as it is more accurate.
Find out the type of key using ‘_readme.txt’ file
- Open the ransom demand message (‘_readme.txt’ file).
- Scroll down to the end of the file.
- There you will see a line with the text ‘Your personal ID’.
- Below is a line of characters that starts with ‘0250’ – this is your personal id.
Find out the type of key using ‘PersonalID.txt’ file
- Open disk C.
- Open directory ‘SystemID’.
- Open file named ‘PersonalID.txt’. This file lists ‘Personal ID’s that match the keys that the virus used to encrypt files.
The ‘Personal ID’ is not a key, it is an identifier related to a key that was used to encrypt files. If the ID ends with ‘t1’, then the files are encrypted with an offline key. If the ID does not end with ‘t1’, Ogdo ransomware virus used an online key. If you could not figure out how to determine which key was used to encrypt files, then we can help. Just write a request here or in the comments below.
Ogdo File Decrypt Tool : “No key for New Variant online ID”
If, when you try to decrypt .ogdo files, Ogdo File Decrypt Tool reports:
No key for New Variant online ID: *
Notice: this ID appears to be an online ID, decryption is impossible
It means that your files are encrypted with an ‘online key’ and their decryption is impossible, since only the ogdo authors have the key necessary for decryption. In this case, you need to use alternative methods listed below to restore the contents of encrypted files.
Ogdo File Decrypt Tool : “No key for New Variant offline ID”
If, during decryption of .ogdo files, Ogdo File Decrypt Tool reports:
No key for New Variant offline ID: *t1
Notice: this ID appears be an offline ID, decryption MAY be possible in the future.
It means the following: your files are encrypted with an ‘offline key’, but the key itself has not yet been obtained by security researchers, in this case, you need to be patient and wait a while, in addition, you can also use alternative ways for recovering encrypted data.
If for some reason you were unable to decrypt the encrypted files, then We recommend to follow the news on our Facebook or YouTube channels. So you ‘ll know right away that it ‘s possible to decrypt .ogdo files.
This video step-by-step guide will demonstrate How to remove Ogdo ransomware and Decrypt/Recover .ogdo files:
How to restore .ogdo files
If your files were encrypted with .ogdo extension, then there is a chance that you can recover the files without decryption. We recommend using PhotoRec and ShadowExplorer that are designed to find and recover lost and deleted data. Mostly such programs are paid, but these tools can restore your files for free. Each of these tools has helped many times to recover files after ransomware infection in what would seem to be the most hopeless cases. We want to remind you that before you try to recover files, you need to check your computer for ransomware using free malware removal tools. It is very important to find the Ogdo virus and completely remove it.
Recover .ogdo encrypted files using Shadow Explorer
Modern versions of the Windows OS have one very useful feature. The Windows automatically makes copies of the files you use. These copies are called ‘Shadow Volume Copies’ and are not directly visible to the user. ShadowExplorer will allow you to get easy access to these files, and thus restore the original state of encrypted files. Of course, not everything is so simple, unfortunately very often ransomware deletes these copies, thus preventing the simple recovery of encrypted files. But in some cases, copies of the files remain and allow for quick file recovery. Therefore, our opinion, you need to try this method.
Visit the page linked below to download the latest version of ShadowExplorer for Windows. Save it on your MS Windows desktop.
Category: Security tools
Update: September 15, 2019
After downloading is done, open a directory in which you saved it. Right click to ShadowExplorer-0.9-portable and select Extract all. Follow the prompts. Next please open the ShadowExplorerPortable folder like below.
Double click ShadowExplorerPortable to start it. You will see the a window as displayed below.
In top left corner, choose a Drive where encrypted files are stored and a latest restore point as on the image below (1 – drive, 2 – restore point).
On right panel look for a file that you want to recover, right click to it and select Export like below.
This video step-by-step guide will demonstrate How to recover encrypted files using Shadow Explorer.
Run PhotoRec to restore .ogdo files
There is another very good way to recover .ogdo files – use a tool that finds and restores deleted files. We recommend using PhotoRec. This is one of the few programs that allows you to do this for free. The reason that allows you to recover encrypted files using this method is simple – when you or any program, including the ransomware, deletes the file, this file is not deleted, the Windows OS marks it as deleted and hides it. PhotoRec finds such deleted files and restores them. Thus, at the output, you get files in an unencrypted state. The only thing I want to draw your attention to is that the less you used your computer after ransomware infection, the higher your chance of recovering encrypted files.
Download PhotoRec on your MS Windows Desktop from the link below.
Category: Security tools
Update: March 1, 2018
Once the download is done, open a directory in which you saved it. Right click to testdisk-7.0.win and choose Extract all. Follow the prompts. Next please open the testdisk-7.0 folder as displayed below.
Double click on qphotorec_win to run PhotoRec for Microsoft Windows. It will display a screen as shown on the image below.
Select a drive to recover as displayed on the image below.
You will see a list of available partitions. Choose a partition that holds encrypted photos, documents and music like below.
Press File Formats button and choose file types to restore. You can to enable or disable the restore of certain file types. When this is complete, click OK button.
Next, click Browse button to choose where restored photos, documents and music should be written, then press Search. We strongly recommend that you save the recovered files to an external drive.
Count of recovered files is updated in real time. All recovered photos, documents and music are written in a folder that you have chosen on the previous step. You can to access the files even if the restore process is not finished.
When the restore is complete, press on Quit button. Next, open the directory where recovered photos, documents and music are stored. You will see a contents as displayed below.
All restored photos, documents and music are written in recup_dir.1, recup_dir.2 … sub-directories. If you are searching for a specific file, then you can to sort your restored files by extension and/or date/time.
This video step-by-step guide will demonstrate How to recover encrypted files using PhotoRec.
How to protect your PC from Ogdo ransomware
Most antivirus apps already have built-in protection system against the crypto malware. Therefore, if your personal computer does not have an antivirus program, make sure you install it. As an extra protection, run the HitmanPro.Alert. All-in-all, HitmanPro.Alert is a fantastic tool to protect your personal computer from any ransomware. If ransomware is detected, then HitmanPro.Alert automatically neutralizes malware and restores the encrypted files. HitmanPro.Alert is compatible with all versions of Windows OS from Microsoft Windows XP to Windows 10.
Please go to the following link to download HitmanPro.Alert. Save it on your Microsoft Windows desktop or in any other place.
Category: Security tools
Update: March 6, 2019
After the downloading process is done, open the file location. You will see an icon like below.
Double click the HitmanPro Alert desktop icon. When the tool is opened, you will be shown a window where you can choose a level of protection, as displayed on the image below.
Now press the Install button to activate the protection.
This guide was created to help all victims of Ogdo ransomware virus. We tried to give answers to the following questions: how to remove Ogdo ransomware; how to decrypt .ogdo files; how to recover files, if the Ogdo File Decypt Tool does not help; what is an online key and what is an offline key. We hope that the information presented in this manual has helped you.
If you have questions, then write to us, leaving a comment below. If you need more help with Ogdo related issues, go to here.