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Remove Crypt38 Ransomware and Restore .crypt38 Files

STF-crypt38-regist-ransomware-russian-ransom-note

A ransomware dubbed Crypt38 was found recently by Fortinet researchers. The name comes from the extension it appends to encrypted files, namely .crypt38. The ransom money it demands as payment is 1000 Rubles or roughly 15 US dollars, with the ransom note written in Russian.

To know how to remove the ransomware and what to do to restore your files, you should read this article to its very end.

Threat Summary

Name Crypt38
Type Ransomware
Short Description The ransomware uses an AES algorithm and encrypts files appending the extension .crypt38 to them.
Symptoms The ransomware will lock your files and display a ransom note in Russian. Inside it is written that you have to pay around 15 US dollars for file decryption.
Distribution Method Spam Emails, Email Attachments, Suspicious Sites
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User Experience Join Our Forum to Discuss Crypt38.

Crypt38 Ransomware – How Is It Spread?

Crypt38 ransomware is possibly spread with spam emails. Such emails have attached files. The malicious code is hidden inside such attachments most of the time. The interesting thing is that emails like that might infect your computer through the body of the email if it contains malicious code.

Social media services and those for file-sharing might include hidden malware files uploaded by the criminals. To avoid getting infected by malware such as this could be done if you are very careful around what you click, open and download when browsing the Web. Suspicious files and links could be dangerous, particularly if they are of an unknown origin.

Crypt38 Ransomware – Technical Overview

Crypt38 is the name given to ransomware, recently found by Fortinet researchers. The name comes from the extension it creates. After the encryption process is complete, it will display the following email address – regist3030@yandex(.)ru.

The ransomware will create the file lsass.exe, in the following directory:

→%Appdata%\Microsoft\Windows\

After that “Autorun” will be enabled for the malware file with this entry in the Windows Registry:

→HKCU\Software\Microsoft\Windows\CurrentVersion\Run lsass (value)

After encryption, the Crypt38 ransomware creates the ransom note file. The payment instructions will be given there (in Russian). Here is a picture of the file:

STF-crypt38-regist-ransomware-russian-ransom-note

The file’s text is written in Russian, and it states the following:

Ваши данные зашифрованы!
Стоимость расшифровки: 1000 рублей
Код разблокировки: / Расшифровать
Ваш ID: [random numbers] Отправьте его на regist3030@yandex.ru

Не удаляйте и не редактируйте файлы .crypt38 и файлы вируса, иначе восстановить данные не получится!

The demanded ransom price is 1000 Rubles, which is around 15 US dollars. There is a warning, which states not to tamper with encrypted files in any way. The payment instructions are written entirely in Russian, but not only Russian speaking countries may be targeted. Do not pay the ransom is a sound advice here. Paying will support the ransomware creators, but it will not guarantee the restoration of your files.

The Crypt38 ransomware uses an AES algorithm for encryption. File extensions which the ransomware searches to encrypt are these:

STF-crypt38-regist-ransomware-.crypt38-file-encryption

→.svg, .indd, .cpp, .pas, .php, .cs, .py, .java, .class, .fla, .pl, .sh, .jpg, .jpeg, .jps, .bmp, .tiff, .avi, .mov, .mp4, .amr, .aac, .doc, .docx, .xls, .xlsx, .ppt, .pptx, .txt, .pdf, .html, .rtf, .dwg, .cdw, .max, .psd, .3dm, .3ds, .dxf, .ps, .ai, .accdb, .odt, .odp, .odx, .ibooks, .xlp, .db, .dbf, .mdf, .sdf, .mdb, .sql, .rar, .7z, .zip, .vcf, .cer, .csr, .torrent, .otl, .report, .key, .csv, .xml

When the encryption process is complete, every file will have the same extension as an appendix – .crypt38. What makes the encryption process rather slow, however, is that the ransomware manually enumerates drive letters in the following sequence:

C:\, D:\, E:\, Z:\, Y:\, X:\, W:\, V:\, F:\, G:\, H:\, I:\, J:\, K:\, U:\, T:\, S:\, R:\, Q:\, L:\, M:\, N:\, O:\, P:\, A:\, B:\

The ransomware will also exclude locking files from strings containing the following:

  • Windows
  • msocache
  • Program Files (x86)
  • Program Files

Crypt38 ransomware might also delete the Shadow Volume Copies service from the Windows operating system. That is not important, given the fact that there is a way to decrypt your files. Read below to see what researchers have found about the encryption process.

Remove Crypt38 Ransomware and Restore .crypt38 Encrypted Files

If your computer is infected by the Crypt38 ransomware, you should have experience with malware removal. You should remove the ransomware as fast as possible as it could encrypt more files spread deeper in the network you use. The recommended action for you is to remove the ransomware completely and follow the step-by-step instructions guide given down below.

Manually delete Crypt38 from your computer

Note! Substantial notification about the Crypt38 threat: Manual removal of Crypt38 requires interference with system files and registries. Thus, it can cause damage to your PC. Even if your computer skills are not at a professional level, don’t worry. You can do the removal yourself just in 5 minutes, using a malware removal tool.

1. Boot Your PC In Safe Mode to isolate and remove Crypt38 files and objects.
2. Find malicious files created by Crypt38 on your PC.
3. Fix registry entries created by Crypt38 on your PC.

Automatically remove Crypt38 by downloading an advanced anti-malware program

1. Remove Crypt38 with SpyHunter Anti-Malware Tool
2. Back up your data to secure it against infections and file encryption by Crypt38 in the future
3. Restore files encrypted by Crypt38
Optional: Using Alternative Anti-Malware Tools

Berta Bilbao

Berta is the Editor-in-Chief of SensorsTechForum. She is a dedicated malware researcher, dreaming for a more secure cyber space.

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