Remove File-Locker Ransomware – Restore .locked Files

Remove File-Locker Ransomware – Restore .locked Files

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file-locker ransomware Warning!!!!!!.txt ransom note stf

This guide refers to the removal of File-Locker ransomware from the infected PC and the recovery process of .locked files.

File-Locker is the name given to a new HiddenTear based data locker ransomware that encodes target files and marks them with the .locked extension. The ransomware renders all corrupted data inaccessible until a demanded ransom payment is paid for their decryption. After encryption File-Locker crypto virus drops a ransom note file Warning!!!!!!.txt on the desktop. This ransom note is written in both Korean and English. It demands 50,000 won (the currency of South Korea) in bitcoin as a ransom payment.

Threat Summary

TypeRansomware, Cryptovirus
Short DescriptionThe ransomware virus encrypts files on your PC and a ransom note demands 50,000 won in Bitcoins for the decryption of .locked files.
SymptomsThis ransomware will encrypt your files and then append the extension .locked on every encrypted file.
Distribution MethodSpam Emails, Email Attachments, Executable Files
Detection Tool See If Your System Has Been Affected by File-Locker


Malware Removal Tool

User ExperienceJoin Our Forum to Discuss File-Locker.
Data Recovery ToolWindows Data Recovery by Stellar Phoenix Notice! This product scans your drive sectors to recover lost files and it may not recover 100% of the encrypted files, but only few of them, depending on the situation and whether or not you have reformatted your drive.

File-Locker Ransomware – Distribution

File-Locker ransomware infection occurs once the executable file named File-Locker Ransomware.exe is running on the system. The payload may be spread via different techniques, but one of them is considered to be the preferred one. It’s about spam email messages that generally deliver the ransomware payload. Such emails usually come with a spoofed sender and an email address. This trick aims to mislead addressee that the received email appears to be sent from a trustworthy source like favorite websites, popular services, public organizations and even governmental entities. The main aim of these emails is to trick receivers into reaching out a malicious file attachment or a corrupted web link. Once the malicious file attachment that carries the File-Locker ransomware payload is started on the system, it triggers the infection. Plagued email attachments usually come as documents, archives, pictures, projects, or other commonly used file types. When a corrupted web link is used for the ransomware distribution, it lands on a web page which has the payload injected into its code. As it may be set to download the malicious file automatically the ransomware penetrates the system unnoticeably and starts encoding target data.

File-Locker Ransomware – Infection Flow

It seems that the code of a threat created for educational purposes – HiddenTear has been modified for another severe ransomware attack and released in active attack campaigns against online users. The File-Locker is a new HiddenTear based ransomware that is targeting primarily users in Korea which does not exclude its distribution worldwide.

The analyses of the new File-Locker ransomware samples reveal that it can perform various malicious actions. Once the ransomware payload contained in the file File-Locker Ransomware.exe is running on the system, it initiates a sequence of malicious actions. Thus the threat could easily bypass the available security layers and establish its malicious files on the system. Additionally, File-Locker can create more malicious files and terminate various processes to fulfill the attack. Some files associated with File-Locker may be located in the following system folders:

  • %AppData%
  • %Temp%
  • %Roaming%
  • %Common%
  • %System32%

File-Locker ransomware uses the AES encryption algorithm to encode a predefined list of target file extensions and then appends the extension .locked to all corrupted data. Afterward, it requests 50,000 Won, or approximately 50 USD, from victims so they could get the files back. The amount should be transferred in bitcoin to a specified Bitcoin address that supposedly belongs to the creators of the threat. The exact address is mentioned in a ransom note created on the desktop. It is called Warning!!!!!!.txt and is written in both English and Korean. What the entire note reads is:

한국어: 경고!!! 모든 문서, 사진, 데이테베이스 및 기타 중요한 파일이 암호화되었습니다!!
당신은 돈을 지불해야 합니다
비트코인 5만원을 fasfry2323@naver.com로 보내십시오 비트코인 지불코드: 1F1tAaz5x1HUXrCNLbtMDqcw6o5GNn4xqX 결제 사이트

English: Warning!!! All your documents, photos, databases and other important personal files were encrypted!!
You have to pay for it.
Send fifty thousand won to Bitcoin payment code: 1BoatSLRHtKNngkdXEeobR76b53LETtpyT Payment site

file-locker ransomware Warning!!!!!!.txt ransom note stf

Any contacts and negotiations with the hackers should be avoided. Remember that the ransom payment provides no guarantee of .locked files decryption. Following hackers’ rules only encourages them to continue spreading devastating infections like File-Locker ransomware and blackmail infected users. In this article are presented secure solutions that will help to regain the control over infected PC and corrupted files without funding crooks.

File-Locker Ransomware – Data Encryption

As File-Locker crypto virus script is HiddenTear based it utilizes the AES cipher algorithm to encrypt predefined file types. The ransomware scans the system for the following file extensions that store valuable information:

.txt, .doc, .docx, .xls, .index, .pdf, .zip, .rar, .css, .lnk, .xlsx, .ppt, .pptx, .odt, .jpg, .bmp, .png, .csv, .sql, .mdb, .sln, .php, .asp, .aspx, .html, .xml, .psd, .bk, .bat, .mp3, .mp4, .wav, .wma, .avi, .divx, .mkv, .mpeg, .wmv, .mov, .ogg, .java, .csv, .kdc, .dxg, .xlsm, .pps, .cpp, .odt, .php, .odc, .log, .exe, .cr2, .mpeg, .jpeg, .xqx, .dotx, .pps, .class, .jar, .psd, .pot, .cmd, .rtf, .csv, .php, .docm, .xlsm, .js, .wsf, .vbs, .ini, .jpeg, .gif, .7z, .dotx, .kdc, .odm, .xll, .xlt, .ps, .mpeg, .pem, .msg, .xls, .wav, .odp, .nef, .pmd, .r3d, .dll, .reg, .hwp, .7z, .p12, .pfx, .cs, .ico, .torrent, .c

Each time File-Locker detects a match during the scan it modifies the original code of the target file and renders it completely unusable. All encrypted files receive the specific extension .locked at the end of their names. Corrupted .locked files remain unusable until a proper solution is applied for their recovery.

To prevent one of the available data recovery options, the ransomware deletes all Shadow Volume Copies stored in the Windows Operating System.

Remove File-Locker Ransomware – Restore .locked Files

File-Locker ransomware is a nasty infection that should be removed immediately from the infected machine. Otherwise, it will keep obstructing the regular access to valuable information. As long as its malicious files are present on the system it has the chance to execute them automatically on each system start and corrupt additional data. Only after the complete removal of all files and objects associated with File-Locker ransomware, the device can be used regularly again. To remove File-Locker crypto virus just follow the step-by-step removal guide below which provides both manual and automatic approaches. Due to the complexity of ransomware code, security researchers recommend the help of advanced anti-malware tool for maximum efficiency.

Once the removal is complete, alternative data recovery approaches could be also found in the guide. They may be useful for the restore of some .locked files. Be advised to back up all encrypted files to an external drive before you proceed with the recovery process.

Gergana Ivanova

Gergana Ivanova

Gergana has completed a bachelor degree in Marketing from the University of National and World Economy. She has been with the STF team for three years, researching malware and reporting on the latest infections.

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