Overview

overview

10

Static

static

d8a0d25776...88.exe

windows7_x64

10

d8a0d25776...88.exe

windows10_x64

10

Analysis

  • max time kernel
    136s
  • max time network
    120s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    13-09-2021 15:41

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General

  • Target

    d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488.exe

  • Size

    140KB

  • MD5

    c0f972c5e033c0b4dc268a805cfa16a2

  • SHA1

    a3f38579feb14d3b20289e453b41d88232145f68

  • SHA256

    d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

  • SHA512

    de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = '3y5fSfK'; $torlink = 'http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};
URLs

http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Drops file in Program Files directory 64 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488.exe
    "C:\Users\Admin\AppData\Local\Temp\d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488.exe"
    1⤵
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3728
    • C:\Users\Admin\AppData\Local\Temp\gRnLxOynorep.exe
      "C:\Users\Admin\AppData\Local\Temp\gRnLxOynorep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:2900
    • C:\Users\Admin\AppData\Local\Temp\hOdgEBygplan.exe
      "C:\Users\Admin\AppData\Local\Temp\hOdgEBygplan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:4004
    • C:\Users\Admin\AppData\Local\Temp\PKenmRFJKlan.exe
      "C:\Users\Admin\AppData\Local\Temp\PKenmRFJKlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:3144
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3872
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:3952
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
        PID:3960
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
          PID:1860
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
            PID:4220
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
              PID:4208

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads