.1C Ransomware

Also Known As: .1C virus
Distribution: Low
Damage level: Severe

.1C ransomware removal instructions

What is .1C?

First discovered by Michael Gillespie, .1C is a high-risk ransomware-type virus that belongs to the Rotor ransomware family. The virus is designed to encrypt users' files, but no information is given about the encryption algorithm (symmetric or asymmetric) used.

Following encryption, .1C modifies the affected files by changing extensions to "!@#$%^&-()_+.1C". For example, a file named "1.jpg" becomes "1.jpg!@#$%^&-()_+.1C" after encryption. In addition, it creates a "INFO.txt" file that contains two email addresses (inkognitoman@tutamail.com and inkognitoman@firemail.cc) and a short message in Russian stating that you can contact cyber criminals using one of these email addresses. There is no information about the sum (ransom) required or how soon to contact these cyber criminals. Despite this lack of information, cyber criminals typically generate a key required for decryption individually for each victim, and this is stored on a remote sever controlled by them. Do not trust cyber criminals or contact them. They often ignore victims even when they satisfy the conditions and pay the ransom. Currently, there are no tools able to decrypt affected files free of charge. Therefore you can only restore them from an existing backup, if you have one available.

Screenshot of a message encouraging users to pay a ransom to decrypt their compromised data:


The internet is full of ransomware-type viruses of this type, including StorageCrypt, Gamma, and Koolova. These are just some examples, however, most ransomware-type viruses serve an identical purpose: to encrypt users' files and demand ransom payments. These viruses are different only in terms of the required ransom amount or encryption algorithm used (usually, RSA or AES). Furthermore, it is impossible to decrypt the files without contacting the cyber criminals who originally developed the virus (this is not recommended). It might be possible to decrypt the files only if the virus is still in a development state or contains bugs. Therefore, maintain regular data backups and store them in on a remote server (e.g. Cloud) or unplugged storage device. If not, the virus can encrypt your backups together with regular data.

How did ransomware infect my computer?

Your system might have become infected by .1C virus in a number of ways: through spam email campaigns, fake software update tools, trojans, unofficial download sources, and P2P (Peer-to-Peer) networks. Cyber criminals employ spam campaigns by attaching untrustworthy/malicious files to emails that, once opened, infect systems with ransomware-type viruses or other infections. Fake software update tools can infect systems by exploiting outdated software bugs (or other problems) and downloading malware rather than the updates promised. Trojans are capable of causing chain infections to proliferate other viruses (including ransomware). Unofficial software download sources (such as websites offering freeware downloads, free file hosting websites, and so on), and Peer-to-Peer networks such as torrents, eMule, and others often present untrustworthy executables as legitimate applications.

Threat Summary:
Name.1C virus
Threat TypeRansomware, Crypto Virus, Files locker
SymptomsCan't open files stored on your computer, previously functional files now have a different extension, for example my.docx.locked. A ransom demanding message is displayed on your desktop. Cyber criminals are asking to pay a ransom (usually in bitcoins) to unlock your files.
Distribution methodsInfected email attachments (macros), torrent websites, malicious ads.
DamageAll files are encrypted and cannot be opened without paying a ransom. Additional password stealing trojans and malware infections can be installed together with a ransomware infection.

To eliminate .1C virus our malware researchers recommend scanning your computer with Spyhunter.
▼ Download Spyhunter
Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

How to protect yourself from ransomware infections?

Browse the web and download/install or update software with care. Do not open irrelevant attachments in emails that are sent from unknown or suspicious senders. Keep your software updated, but use implemented, official tools that are provided by software developers, not third party tools. Download software using official, trustworthy websites and direct links. Avoid using third party downloaders, torrents, peer-to-peer (P2P) networks, etc. These often download your chosen software, but together with various potentially unwanted applications that might be malicious. Have a reputable antivirus software installed on your computer and keep it enabled at all times. If your computer is already infected with .1C, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in .1C ransomware text file :

Для связи с нами используйте почту

Screenshot of files encrypted by .1C ("!@#$%^&-()_+.1C" extension):


.1C ransomware removal:

Instant automatic removal of .1C virus: Manual threat removal might be a lengthy and complicated process that requires advanced computer skills. Spyhunter is a professional automatic malware removal tool that is recommended to get rid of .1C virus. Download it by clicking the button below:
▼ DOWNLOAD Spyhunter By downloading any software listed on this website you agree to our Privacy Policy and Terms of Use. Free scanner checks if your computer is infected. To remove malware, you have to purchase the full version of Spyhunter.

Quick menu:

Step 1

Windows XP and Windows 7 users: Start your computer in Safe Mode. Click Start, click Shut Down, click Restart, click OK. During your computer start process, press the F8 key on your keyboard multiple times until you see the Windows Advanced Option menu, and then select Safe Mode with Networking from the list.

Safe Mode with Networking

Video showing how to start Windows 7 in "Safe Mode with Networking":

Windows 8 users: Start Windows 8 is Safe Mode with Networking - Go to Windows 8 Start Screen, type Advanced, in the search results select Settings. Click Advanced startup options, in the opened "General PC Settings" window, select Advanced startup. Click the "Restart now" button. Your computer will now restart into the "Advanced Startup options menu". Click the "Troubleshoot" button, and then click the "Advanced options" button. In the advanced option screen, click "Startup settings". Click the "Restart" button. Your PC will restart into the Startup Settings screen. Press F5 to boot in Safe Mode with Networking.

Windows 8 Safe Mode with networking

Video showing how to start Windows 8 in "Safe Mode with Networking":

Windows 10 users: Click the Windows logo and select the Power icon. In the opened menu click "Restart" while holding "Shift" button on your keyboard. In the "choose an option" window click on the "Troubleshoot", next select "Advanced options". In the advanced options menu select "Startup Settings" and click on the "Restart" button. In the following window you should click the "F5" button on your keyboard. This will restart your operating system in safe mode with networking.

windows 10 safe mode with networking

Video showing how to start Windows 10 in "Safe Mode with Networking":

Step 2

Log in to the account infected with the .1C virus. Start your Internet browser and download a legitimate anti-spyware program. Update the anti-spyware software and start a full system scan. Remove all entries detected.

If you cannot start your computer in Safe Mode with Networking, try performing a System Restore.

Video showing how to remove ransomware virus using "Safe Mode with Command Prompt" and "System Restore":

1. During your computer start process, press the F8 key on your keyboard multiple times until the Windows Advanced Options menu appears, and then select Safe Mode with Command Prompt from the list and press ENTER.

Boot your computer in Safe Mode with Command Prompt

2. When Command Prompt mode loads, enter the following line: cd restore and press ENTER.

system restore using command prompt type cd restore

3. Next, type this line: rstrui.exe and press ENTER.

system restore using command prompt rstrui.exe

4. In the opened window, click "Next".

restore system files and settings

5. Select one of the available Restore Points and click "Next" (this will restore your computer system to an earlier time and date, prior to the .1C ransomware virus infiltrating your PC).

select a restore point

6. In the opened window, click "Yes".

run system restore

7. After restoring your computer to a previous date, download and scan your PC with recommended malware removal software to eliminate any remaining .1C ransomware files.

To restore individual files encrypted by this ransomware, try using Windows Previous Versions feature. This method is only effective if the System Restore function was enabled on an infected operating system. Note that some variants of .1C are known to remove Shadow Volume Copies of the files, so this method may not work on all computers.

To restore a file, right-click over it, go into Properties, and select the Previous Versions tab. If the relevant file has a Restore Point, select it and click the "Restore" button.

Restoring files encrypted by CryptoDefense

If you cannot start your computer in Safe Mode with Networking (or with Command Prompt), boot your computer using a rescue disk. Some variants of ransomware disable Safe Mode making its removal complicated. For this step, you require access to another computer.

To regain control of the files encrypted by .1C, you can also try using a program called Shadow Explorer. More information on how to use this program is available here.

shadow explorer screenshot

To protect your computer from file encryption ransomware such as this, use reputable antivirus and anti-spyware programs. As an extra protection method, you can use programs called HitmanPro.Alert and EasySync CryptoMonitor, which artificially implant group policy objects into the registry to block rogue programs such as .1C ransomware.

Note that Windows 10 Fall Creators Update includes a "Controlled Folder Access" feature that blocks ransomware attempts to encrypt your files. By default, this feature automatically protects files stored in the Documents, Pictures, Videos, Music, Favorites as well as Desktop folders.

Controll Folder Access

Windows 10 users should install this update to protect their data from ransomware attacks. Here is more information on how to get this update and add an additional protection layer from ransomware infections.

HitmanPro.Alert CryptoGuard - detects encryption of files and neutralises any attempts without need for user-intervention:

hitmanproalert ransomware prevention application

Malwarebytes Anti-Ransomware Beta uses advanced proactive technology that monitors ransomware activity and terminates it immediately - before reaching users' files:

malwarebytes anti-ransomware

  • The best way to avoid damage from ransomware infections is to maintain regular up-to-date backups. More information on online backup solutions and data recovery software Here.

Other tools known to remove .1C ransomware:

About the author:

Tomas Meskauskas

Tomas Meskauskas - expert security researcher, professional malware analyst.

I am passionate about computer security and technology. I have an experience of over 10 years working in various companies related to computer technical issue solving and Internet security. I have been working as an author and editor for pcrisk.com since 2010. Follow me on Twitter and LinkedIn to stay informed about the latest online security threats. Contact Tomas Meskauskas.

PCrisk security portal is brought by a company RCS LT. Joined forces of security researchers help educate computer users about the latest online security threats. More information about the company RCS LT.

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Malware activity

Global virus and spyware activity level today:

Medium threat activity

Increased attack rate of infections detected within the last 24 hours.

QR Code
.1C virus QR code
A QR code (Quick Response Code) is a machine-readable code which stores URLs and other information. This code can be read using a camera on a smartphone or a tablet. Scan this QR code to have an easy access removal guide of .1C virus on your mobile device.
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Platform: Windows

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