How to remove KesLan ransomware from the operating system?

Also Known As: KesLan virus
Distribution: Low
Damage level: Severe

KesLan ransomware removal instructions

What is KesLan?

Discovered by GrujaRS, KesLan is a malicious program, categorized as ransomware. It is designed to encrypt data and demand a ransom for decryption (i.e. payment for decryption tools/software). There are several variants of this ransomware. During the encryption, KesLan appends files with the ".TR" extension, making a file like "1.jpg" appear as "1.jpg.TR". A different variant of this malware, renames files with ".TMTEAM" extension (e.g. "1.jpg.TMTEAM"). There are several other possible extensions: ".MMTeam", ".Sifrelendi" and ".TRSomware". What actions the ransomware takes following encryption, depends on its version. One drops a text file titled "Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt" (".TR" variant); another drops "@Lütfen Beni Oku!@.txt" and changes the desktop wallpaper to "@TMTeam@.png" (".TMTEAM" variant). These text files (and the wallpaper) are ransom notes in Turkish language.

According to a rough translation, the "Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt" states that the price of the decryption tool is 400 Turkish liras (approx. 69 US dollars). The note informs victims that paying the ransom is the only way to recover the encrypted data. Additionally, it states that this payment must be made in Bitcoin cryptocurrency. The other version of KesLan text file ("Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt") contains a more detailed message. It claims that all of the users' important files (documents, photos, videos, databases, etc.) have been encrypted and only the cyber criminals behind the infection can restore them to their original condition. This ransom note does not specify the size of the payment, but gives victims 7 days to pay, claiming that after this period - decryption will no longer be possible. Users are told to contact the developers of KesLan via the Discord communication platform. Once the transaction is complete, victims are promised to be sent the tools necessary to recover their data. The message ends with warnings, which instruct users not remove the ransomware program and not to run any anti-virus software - else they will experience permanent data loss. The note recommends to disable the antivirus, as it can automatically eliminate KesLan and the result will be the same. Furthermore, the device must be connected to the Internet, so that the criminals could communicate with the victims. The text presented on the wallpaper ("@TMTeam@.png") is a practically identical ransom note to "Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt". Unfortunately, is true that in most cases of ransomware infections, without the interference of its developers - manual decryption is impossible. It might be a possibility, only if the malware is still in development and/or has certain flaws/bugs. Regardless, it is expressly advised against communicating with and/or paying cyber criminals. Often, despite meeting the ransom demands - affected users do not receive the promised decryption tools/software. Therefore, their files remain encrypted and beyond repair. To prevent KesLan from further encryptions - it must be removed from the system. However, removal will not restore already compromised files. The data may be recovered form a backup, if one was made prior the infection and stored in a different location.

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

KesLan decrypt instructions (Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt)

LockBitIMIROGERJavaRatty are a few examples of other malicious programs under this classification. Ransomware is created to encrypt data and demand payment for its decryption, however these infections are not identical. Crucial differences include the cryptographic algorithm (symmetric or asymmetric) used to encrypt the files and the ransom size. Cyber criminals prefer digital currencies (primarily, cryptocurrencies), due to transactions of them being difficult/impossible to trace. To ensure data safety, it is advised to keep backups in remote servers and/or unplugged storage devices. Ideally, several backup copies should be stored separately, in different locations.

How did ransomware infect my computer?

Ransomware and other malware usually spread via spam campaigns, trojans, untrustworthy download channels, fake software updaters and illegal activation ("cracking") tools. Spam campaigns are used to send deceptive emails on a large scale. These emails are usually disguised as "official", "important", "urgent" and so on. They contain infectious files (or links leading to such), the attachments can be in a variety of formats - archive (RAR, ZIP) and executable (.run, .exe) files, PDF and Microsoft Office documents, JavaScript, etc. When virulent files are run, executed or otherwise opened - they are triggered to initiate the system infection (i.e. they begin downloading/installing malware). Trojans are malicious programs, designed to cause chain infections. Untrustworthy download sources like: unofficial and free file-hosting sites, P2P sharing networks (BitTorrent, Gnutella, eMule, etc.) and other third party downloaders - are very likely to offer malicious content (e.g. under the guise of ordinary software and/or bundled with it). Fake updaters cause infections by abusing weaknesses of outdated programs and/or by simply installing malware instead of the updates. Rather than activate licensed product, illegal activation tools ("cracks") can download/install malware.

Threat Summary:
Name KesLan virus
Threat Type Ransomware, Crypto Virus, Files locker
Encrypted Files Extension .TR, .TMTEAM, .MMTeam, .Sifrelendi, .TRSomware
Ransom Demanding Message Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt or @Lütfen Beni Oku!@.txt and @TMTeam@.png (desktop wallpaper)
Ransom Amount 400 TL (~69 USD) in Bitcoins
Cyber Criminal Contact 0xDays#8262 (Discord)
Detection Names AVG (FileRepMalware), BitDefender (Gen:Heur.Ransom.RTH.1), ESET-NOD32 (A Variant Of MSIL/Filecoder.AK), Kaspersky (HEUR:Trojan-Ransom.MSIL.Encoder.gen), Full List Of Detections (VirusTotal)
Symptoms Cannot open files stored on your computer, previously functional files now have a different extension (for example, my.docx.locked). A ransom demand message is displayed on your desktop. Cyber criminals demand payment of a ransom (usually in bitcoins) to unlock your files.
Distribution methods Infected email attachments (macros), torrent websites, malicious ads.
Damage All 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.
Removal

To eliminate KesLan 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?

It is strongly recommended not to open suspicious/irrelevant emails. All attachments (and links) found in suspect mail - must never be opened, as these files are the source of a potential infection. Only official and verified download channels should be used. Software activation and updating should be done with tools/functions, provided by legitimate developers. Illegal activation ("cracking") tools and third party updaters are considered to be high-risk, therefore they are advised against use. It is important to have a reputable anti-virus/anti-spyware suite installed and kept up-to-date. These programs are to be used to perform regular system scans and removal of all detected threats. If your computer is already infected with KesLan, we recommend running a scan with Spyhunter for Windows to automatically eliminate this ransomware.

Text presented in KesLan ransomware's text file ("Dosyalarını Kurtarmak İstiyorsan Oku!!!.txt"):

Sen:  Dosyalarımı Nasıl Kurtarabilirim

Ben:  400 TL Karşılığın'da Dosyalarınızı Kurtarabilirsiniz.
Aksi Taktir'de Dosyalarınızı Sonsuza Kadar Kurtaramazsınız. :)
Kısaca 400 = Decryptor Kapiş?

Sen:  Adresi Ver OÇ
BTC(Bitcoin) Address:

Ben:  Kes Lan

Screenshot of files encrypted by KesLan (".TR" extension):

Files encrypted by KesLan (.TR extension)

Screenshot of the second KesLan variant's text file ("@Lütfen Beni Oku!@.txt"):

KesLan second variant ransom note (@Lütfen Beni Oku!@.txt)

Text presented in this file:

Bilgisayarıma ne oldu?
Önemli dosyalarınız şifrelidir.
Belgelerinizin, fotoğraflarınızın, videolarınızın, veritabanlarının ve diğer dosyalarınızın birçoğu şifrelendiğinden artık erişilebilir değillerdir. Belki dosyalarınızı kurtarmanın bir yolunu bulmakla meşgulsünüz, ancak zamanınızı boşa harcamayın. Şifreleme servisimiz olmadan dosyalarınızı kimse kurtaramaz.

Dosyalarımı Kurtarabilir miyim?
Tüm dosyalarınızı güvenli ve kolay bir şekilde kurtarabileceğinizi garanti ederiz. Ama yeterince zamanınız yok.
Eğer 7 gün içinde ödeme yapmazsanız, dosyalarınızı sonsuza dek kurtaramazsınız.

Nasıl ödeme yaparım?
Ödeme için discord'dan bizi ekleyin: 0xDays#8262
Ödemenizin ardından size özel decryptor yani şifre çözücüyü vereceğiz.
Ödeme yapıldıktan sonra decryptor(şifre çözücü) ile hemen dosyalarınızın şifresini çözmeye başlayabilirsiniz.

Siz, ödeme yapana ve ödeme işleme koyulana kadar, bu yazılımı kaldırmamaya ve anti-virüsünüzü bir süre devre dışı bırakmamenizi önemle tavsiye ederiz. Virüsten koruma yazılımınız güncellenir ve bu yazılımı otomatik olarak kaldırırsa, ödeme yapsanız bile dosyalarınızı kurtaramazsınız!
Ve sakın unutmayın internetinizi açık brakın yoksa sizle iletişime geçemeyiz.

Screenshot of files encrypted by KesLan (".TMTEAM" extension):

Files encrypted by KesLan (.TMTEAM extension)

Screenshot of the second KesLan variant's wallpaper ("@TMTeam@.png"):

KesLan second variant wallpaper

Text presented in the wallpaper:

Oops Tüm Dosyalarınız Şifrelendi!
Önemli dosyalarınız şifrelidir.
Belgelerinizin, fotoğraflarınızın, videolarınızın, veritabanlarının ve diğer dosyalarınızın birçoğu şifrelendiğinden artık erişilebilir değillerdir. Belki dosyalarınızı kurtarmanın bir yolunu bulmakla meşgulsünüz, ancak zamanınızı boşa harcamayın. Şifreleme servisimiz olmadan dosyalarınızı kimse kurtaramaz.

Dosyalarımı Kurtarabilir miyim?
Tüm dosyalarınızı güvenli ve kolay bir şekilde kurtarabileceğinizi garanti ederiz. Ama yeterince zamanınız yok. Eğer 7 gün içinde ödeme yapmazsanız, dosyalarınızı sonsuza dek kurtaramazsınız.

Nasıl ödeme yaparım?
Ödeme için discord'dan bizimle iletişime geçin: 0xDays#8262
Ödemenizin ardından size özel decryptor yani şifre çözücüyü vereceğiz.
Ödeme yapıldıktan sonra decryptor(şifre çözücü) ile hemen dosyalarınızın şifresini çözmeye başlayabilirsiniz.

Siz, ödeme yapana ve ödeme işleme koyulana kadar, bu yazılımı kaldırmamaya ve anti-virüsünüzü bir süre devre dişi bırakmamenizi önemle tavsiye ederiz. Virüsten koruma yazılımınız güncellenir ve bu yazılımı otomatik olarak kaldırırsa, ödeme yapsanız bile dosyalarınızı kurtaramazsınız!
Ve sakin unutmayın internetinizi açık brakın yoksa sizinle iletişime geçemeyiz.

Update December 5, 2019 - Cyber criminals have recently released an updated version of KesLan ransomware which now provides ransom notes in both English ("@Please_Read_Me@.txt") and Turkish ("@Lütfen_Beni_Oku!@.txt") languages.

Screenshot of the English ransom note ("@Please_Read_Me@.txt"):

KesLan ransomware updated variant English note

Text presented within this note:

Q: What happened to my files?

A: Your important files are encrypted. This means that you can no longer access them until they are decrypted.
   If you follow our instructions, we guarantee that you can decrypt all your files quickly and safely!
   Let's start decoding!

Q: What should I do?

A: You must pay the service fee for decryption first.
   Please send $ 100 bitcoin to this bitcoin address: 1MyAGtQZTGndY2wRGD5pscNJbHir3jFDib

   Then, please locate an application file named "@ MMDecrypt0r @ .exe". It is decryption software.
   (You may need to disable your antivirus software for a while.)

Q: How can I trust you?

A: Don't worry about decryption.
   We will definitely decrypt your files because if we deceive users, no one will trust us.

Screenshot of the Turkish ransom note ("@Lütfen_Beni_Oku!@.txt"):

KesLan ransomware updated variant Turkish note

Text presented within this note:

Q: Dosyalarıma ne oldu?

A: Önemli dosyalarınız şifrelenmiştir. Bu, şifresi çözülene kadar onlara artık erişemeyeceğiniz anlamına gelir.
   Talimatlarımızı yerine getirirseniz, tüm dosyalarınızın şifresini hızlı ve güvenli bir şekilde çözebileceğinizi garanti ederiz!
   Şifre çözmeye başlayalım!

Q: Ne yapayım?

A: İlk önce şifre çözme için servis ücreti ödemeniz gerekir.
   Lütfen bu bitcoin adresine 100$ değerinde bitcoin gönderiniz: 1MyAGtQZTGndY2wRGD5pscNJbHir3jFDib

   Daha sonra, lütfen "@MMDecrypt0r@.exe" adlı bir uygulama dosyası bulun. Şifre çözme yazılımıdır.
   (Virüsten koruma yazılımınızı bir süre devre dışı bırakmanız gerekebilir.)
   
Q: Nasıl güvenebilirim?

A: Şifre çözme konusunda endişelenmeyin.
   Dosyalarınızı kesinlikle şifresini çözeceğiz çünkü kullanıcıları aldatırsak kimse bize güvenmeyecek.

Screenshot of the desktop wallpaper:

KesLan ransomware updated variant desktop wallpaper

Screenshot of files encrypted by the updated KesLan ransomware (".TRSomware" extension):

KesLan ransomware updated variant encrypted files

KesLan ransomware removal:

Instant automatic removal of KesLan 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 KesLan 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 KesLan 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 KesLan 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 KesLan 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 KesLan 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 KesLan, 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 KesLan 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, and 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 KesLan 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
Medium

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

QR Code
KesLan virus QR code
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