ryuk

General

Target

775745a0c067961761fa0fba5a2bef456413cd9096906d8772d4b9da6bf5e8b6
Size

885KB
Sample

221020-s4bz3scag9
MD5

a650d5676dc2c91a3af2216044ddaf8c
SHA1

851eea629fda6f930ebfd7ac45de5e8bc3f506b5
SHA256

775745a0c067961761fa0fba5a2bef456413cd9096906d8772d4b9da6bf5e8b6
SHA512

463c54b4fc50ccfe889ab797339afa3f9096c53f8e551a616829b655f218238f53fc9aa9e6908675fed6be8883a555831af4ae1cc348eb80e937f27b34c760c7
SSDEEP

12288:q/2O9w8wycU2JlJYqWYgeWYg955/155/0QebUlAAsjsKqgooRn6X:qbC8tUlqgQKUKRjsKqgbN6

Score

10^/10

Malware Config

Extracted

Path

C:\ProgramData\RyukReadMe.txt

Ransom Note

Your network has been penetrated. All files on each host in the network have been encrypted with a strong algorithm. Backups were either encrypted Shadow copies also removed, so F8 or any other methods may damage encrypted data but not recover. We exclusively have decryption software for your situation. More than a year ago, world experts recognized the impossibility of deciphering by any means except the original decoder. No decryption software is available in the public. Antiviruse companies, researchers, IT specialists, and no other persons cant help you decrypt the data. DO NOT RESET OR SHUTDOWN - files may be damaged. DO NOT DELETE readme files. To confirm our honest intentions.Send 2 different random files and you will get it decrypted. It can be from different computers on your network to be sure that one key decrypts everything. 2 files we unlock for free To get info (decrypt your files) contact us at [email protected] or [email protected] You will receive btc address for payment in the reply letter Ryuk No system is safe

Emails

[email protected]

Targets

- Target
  
  775745a0c067961761fa0fba5a2bef456413cd9096906d8772d4b9da6bf5e8b6
- Size
  
  885KB
- MD5
  
  a650d5676dc2c91a3af2216044ddaf8c
- SHA1
  
  851eea629fda6f930ebfd7ac45de5e8bc3f506b5
- SHA256
  
  775745a0c067961761fa0fba5a2bef456413cd9096906d8772d4b9da6bf5e8b6
- SHA512
  
  463c54b4fc50ccfe889ab797339afa3f9096c53f8e551a616829b655f218238f53fc9aa9e6908675fed6be8883a555831af4ae1cc348eb80e937f27b34c760c7
- SSDEEP
  
  12288:q/2O9w8wycU2JlJYqWYgeWYg955/155/0QebUlAAsjsKqgooRn6X:qbC8tUlqgQKUKRjsKqgbN6
Score

10^/10

ryuk discovery evasion ransomware
- Ryuk
  Ransomware distributed via existing botnets, often Trickbot or Emotet.
  ransomware ryuk
- Clears Windows event logs
  evasion ransomware
- Deletes shadow copies
  Ransomware often targets backup files to inhibit system recovery.
  ransomware
- Modifies boot configuration data using bcdedit
  ransomware evasion
- Deletes backup catalog
  Uses wbadmin.exe to inhibit system recovery.
  ransomware
- Disables Task Manager via registry modification
  evasion
- Disables taskbar notifications via registry modification
  evasion
- Disables use of System Restore points
  evasion
- Checks computer location settings
  Looks up country code configured in the registry, likely geofence.
- Drops startup file
- Modifies file permissions
  discovery
- Enumerates connected drives
  Attempts to read the root path of hard drives other than the default C: drive.
behavioral1 behavioral2