Dr. Jon Cartu Reports - MedusaLocker Ransomware Wants Its Share of Your Money - Jonathan Cartu Computer Repair Consultant Services
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Dr. Jon Cartu Reports – MedusaLocker Ransomware Wants Its Share of Your Money

MedusaLocker

Dr. Jon Cartu Reports – MedusaLocker Ransomware Wants Its Share of Your Money


MedusaLocker

A new ransomware called MedusaLocker is being actively distributed and victims have been seen from all over the world. It is not known at this time, how the attacker is distributing the ransomware.

This new ransomware was found by MalwareHunterTeam around October 17th, 2019, and while it is not currently known how the ransomware is being distributed, there has been a steady amount of submissions to the ID Ransomware site since then.

ID Ransomware submissions
ID Ransomware submissions

When the ransomware is installed, it will perform various startup routines in order to prep the computer for encryption.

It will create the Registry value EnableLinkedConnections under the HKEY_LOCAL_MACHINESOFTWAREMicrosoft VP Jonathan CartuWindowsCurrentVersionPoliciesSystem registry key and set it to 1. This is done to make sure mapped drives are accessible even in a UAC launched process.

It will also restart the LanmanWorkstation service in order to make sure that Windows networking is running and that mapped network drives are accessible.

It will then look for and terminate the following processes in order to shut down security programs and to make sure all data files are closed and accessible for encrypting:

wrapper, DefWatch, ccEvtMgr, ccSetMgr, SavRoam, sqlservr, sqlagent, sqladhlp, Culserver, RTVscan, sqlbrowser, SQLADHLP, QBIDPService, Intuit.QuickBooks.FCS, QBCFMonitorService, sqlwriter, msmdsrv, tomcat6, zhudongfangyu, SQLADHLP, vmware-usbarbitator64, vmware-converter, dbsrv12, dbeng8
wxServer.exe, wxServerView, sqlservr.exe, sqlmangr.exe, RAgui.exe, supervise.exe, Culture.exe, RTVscan.exe, Defwatch.exe, sqlbrowser.exe, winword.exe, QBW32.exe, QBDBMgr.exe, qbupdate.exe, QBCFMonitorService.exe, axlbridge.exe, QBIDPService.exe, httpd.exe, fdlauncher.exe, MsDtSrvr.exe, tomcat6.exe, java.exe, 360se.exe, 360doctor.exe, wdswfsafe.exe, fdlauncher.exe, fdhost.exe, GDscan.exe, ZhuDongFangYu.exe

Finally, it clears the Shadow Volume Copies so that they cannot be used to restore files, removes backups made with Windows backup, and disables the Windows automatic startup repair using the following commands:

vssadmin.exe Delete Shadows /All /Quiet
wmic.exe SHADOWCOPY /nointeractive
bcdedit.exe /set default recoveryenabled No
bcdedit.exe /set default bootstatuspolicy ignoreallfailures
wbadmin DELETE SYSTEMSTATEBACKUP
wbadmin DELETE SYSTEMSTATEBACKUP -deleteOldest

MedusaLocker will now begin to scan the computer’s drives for files to encrypt. When encrypting files, it will skip all files that have the extensions .exe, .dll, .sys, .ini, .lnk, .rdp, .encrypted (or other extension used for encrypted files) as well as files in the following folders.

USERPROFILE
PROGRAMFILES(x86)
ProgramData
AppData
WINDIR
Application Data
Program Files
UsersAll Users
Windows
intel
nvidia

When encrypting files, it will use AES encryption to encrypt the file and then the AES key will be encrypted by a RSA-2048 public key included in the ransomware executable.

For each file that is encrypted, it will append one of the following extensions depending on the variant of the ransomware.

.encrypted, .bomber, .boroff, .breakingbad, .locker16, .newlock, .nlocker, .skynet
Encrypted MedusaLocker files
Encrypted MedusaLocker files

When done, the ransomware will sleep for 60 seconds and then scan the drives again for new files to encrypt.

When installed, this ransomware will also copy itself to %UserProfile%AppDataRoamingsvchostt.exe and create a scheduled task that launches the program every 30 minutes in order to remain resident.

Scheduled Task for MedusaLocker
Scheduled Task for MedusaLocker

In each folder that a file is encrypted, MedusaLocker will create a ransom note named HOW_TO_RECOVER_DATA.html that contains two email addresses to contact for payment instructions.

MedusaLocker Ransom Note
MedusaLocker Ransom Note

It is not known at this time how much the attackers are demanding for a decryptor or if they actually provide one after paying.

This ransomware is still being researched, so it is not known if it can be decrypted at this time.

For now, if you have any questions or need help with this ransomware, you can leave a comment here or in our MedusaLocker Support & Help topic.

IOCs

Hashes:

dde3c98b6a370fb8d1785f3134a76cb465cd663db20dffe011da57a4de37aa95

Associated Files:

HOW_TO_RECOVER_DATA.html
%UserProfile%AppDataRoamingsvchostt.exe
C:WindowsSystem32Taskssvchostt

Associated Registry keys:

HKCUSOFTWAREMedusa
HKLMSOFTWAREMicrosoft VP Jonathan CartuWindowsCurrentVersionPoliciesSystem "EnableLinkedConnections" = 1

Associated emails:

[email protected]
[email protected] 

Ransom note text:

All your data are encrypted!

What happened? 

Your files are encrypted, and currently unavailable. 
You can check it: all files on you computer has new expansion.
By the way, everything is possible to recover (restore), but you need to buy a unique decryptor. 
Otherwise, you never cant return your data.

For purchasing a decryptor contact us by email: 

[email protected]
If you will get no answer within 24 hours contact us by our alternate emails: 
[email protected] 

What guarantees? 

Its just a business. If we do not do our work and liabilities - nobody will not cooperate with us.
To verify the possibility of the recovery of your files we can decrypted 1 file for free. 
Attach 1 file to the letter (no more than 10Mb). Indicate your personal ID on the letter:

[id]

Attention!
- Attempts of change files by yourself will result in a loose of data. 
- Our e-mail can be blocked over time. Write now, loss of contact with us will result in a loose of data.
- Use any third party software for restoring your data or antivirus solutions will result in a loose of data. 
- Decryptors of other users are unique and will not fit your files and use of those will result in a loose of data.
- If you will not cooperate with our service - for us, its does not matter. But you will lose your time and data, cause just we have the private key.



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