Ransom.Win64.RAWLD.A

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops files as ransom note. It avoids encrypting files with the following file extensions.

Arrival Details

This Ransomware arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Ransomware adds the following processes:

• vssadmin.exe delete shadows /all /quiet

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• For whom the bell tolls, it tolls for thee.

Other Details

This Ransomware does the following:

• It attempts to terminate running processes using the Restart Session Manager to encrypt the associated file as such will result to the following registry modification:
  • HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    Owner = {hex values}
  • HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    SessionHash = {hex values}
  • HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    Sequence = 0x01
  • HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    RegFiles{number} = {file}
  • HKEY_CURRENT_USER\Software\Microsoft\RestartManager\Session0000
    RegFilesHash = {hex values}

Ransomware Routine

This Ransomware appends the following extension to the file name of the encrypted files:

• {original filename}.{original extension}.RAWLD

It drops the following file(s) as ransom note:

• {encrypted directory}/Data breach warning.txt

It avoids encrypting files with the following file extensions:

• .exe
• .dll
• .RAWLD
• .iso
• .msi
• .bin