Ransom.Win32.MONDDYA.THABEBD

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.

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 mutexes to ensure that only one of its copies runs at any one time:

• Global\{Generated hash based on GUID}

Process Termination

This Ransomware terminates the following services if found on the affected system:

• backup
• GxBlr
• GxCIMgr
• GxCVD
• GxFWD
• GxVss
• memtas
• mepocs
• msexchange
• sophos
• sql
• svc$
• veeam
• vss

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:

• .RlfdcQhp8

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

• {Encrypted Directory}\RlfdcQhp8.README.txt