ryuk

General

Target

c4811bfb426e9af4ee8ee99ea61db612bbd7ab91b2fb0a21a847990c5626bb10
Size

192KB
Sample

220220-csmdnsgfhn
MD5

ac4845378d6e9585c758efeffe713857
SHA1

4febb67955fa4743db70dad7481702bb46f60d69
SHA256

c4811bfb426e9af4ee8ee99ea61db612bbd7ab91b2fb0a21a847990c5626bb10
SHA512

6edaf5e417087b428feaa81214bad3deab967462b6448f6252a413f839a32dcc40cd6be369284a8d940ad1b0804bbc6a85ae22a179af9d7a5cb780658009c874

Score

10^/10

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note

<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html��

Emails

[email protected]

Extracted

Path

C:\Users\RyukReadMe.html

Family

ryuk

Ransom Note

[email protected] balance of shadow universe Ryuk

Emails

[email protected]

Targets

- Target
  
  c4811bfb426e9af4ee8ee99ea61db612bbd7ab91b2fb0a21a847990c5626bb10
- Size
  
  192KB
- MD5
  
  ac4845378d6e9585c758efeffe713857
- SHA1
  
  4febb67955fa4743db70dad7481702bb46f60d69
- SHA256
  
  c4811bfb426e9af4ee8ee99ea61db612bbd7ab91b2fb0a21a847990c5626bb10
- SHA512
  
  6edaf5e417087b428feaa81214bad3deab967462b6448f6252a413f839a32dcc40cd6be369284a8d940ad1b0804bbc6a85ae22a179af9d7a5cb780658009c874
Score

10^/10

ryuk discovery persistence ransomware
- Ryuk
  Ransomware distributed via existing botnets, often Trickbot or Emotet.
  ransomware ryuk
- Deletes shadow copies
  Ransomware often targets backup files to inhibit system recovery.
  ransomware
- Executes dropped EXE
- Checks computer location settings
  Looks up country code configured in the registry, likely geofence.
- Loads dropped DLL
- Modifies file permissions
  discovery
- Adds Run key to start application
  persistence
behavioral1 behavioral2