FilesL0cker RANSOMWARE actively spreading in the wild.

October 23, 2018

The SonicWall Capture Labs Threat Research Team observed reports of a new variant family of FILESLOCKER [FILESLOCKER.RSM] actively spreading in the wild.

 

FILESLOCKER encrypts the victims files with a strong encryption algorithm until the victim pays a fee to get them back.

Contents of the FILESLOCKER ransomware

Infection Cycle:

The Ransomware adds the following files to the system:

  • Malware.exe
    • %App.path%\ [File Name] .locked
    • %Userprofile\Desktop %\ DECRYPT MY FILES.txt
      • Instruction for recovery

Once the computer is compromised, the Ransomware runs the following commands:

 

The Ransomware encrypts all the files and appends the .locked extension onto each encrypted file’s filename.

 

After encrypting all personal documents the Ransomware shows the following webpage containing a message reporting that the computer has been encrypted and to contact its developer for unlock instructions.

SonicWall Capture Labs provides protection against this threat via the following signature:

  • GAV: FILESLOCKER.RSM (Trojan)