ryuk

General

Target

ryuk.exe
Size

885KB
Sample

220921-ze6ayshae5
MD5

35194c73ff38dd6c3bed7c0efcff6826
SHA1

1a1ebd30f4a3498cc09824b6fdfdf1b8d9ae9db1
SHA256

5fce1d810a5e1c7536496c1b73eff77c9c3d92ac41f86959a1be5349663403ae
SHA512

cf2ed61ffdfad8067aff8776e0dab1f27ea2551f7497108a6cca7eb0105a5f96ea1453dde29f488433cc645e55104d7397ee4f35db51526993823ef46763f28f
SSDEEP

12288:CXrZ7kwy8U9JlpYqWYgeWYg955/155/0QebUlAAs7sKSAoSRn6X:C97ktflKgQKUKR7sKSAhN6

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
  
  ryuk.exe
- Size
  
  885KB
- MD5
  
  35194c73ff38dd6c3bed7c0efcff6826
- SHA1
  
  1a1ebd30f4a3498cc09824b6fdfdf1b8d9ae9db1
- SHA256
  
  5fce1d810a5e1c7536496c1b73eff77c9c3d92ac41f86959a1be5349663403ae
- SHA512
  
  cf2ed61ffdfad8067aff8776e0dab1f27ea2551f7497108a6cca7eb0105a5f96ea1453dde29f488433cc645e55104d7397ee4f35db51526993823ef46763f28f
- SSDEEP
  
  12288:CXrZ7kwy8U9JlpYqWYgeWYg955/155/0QebUlAAs7sKSAoSRn6X:C97ktflKgQKUKR7sKSAhN6
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