Overview

overview

10

Static

static

9513433ce6...16.exe

windows7_x64

10

9513433ce6...16.exe

windows10-2004_x64

10

Analysis

  • max time kernel
    185s
  • max time network
    204s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 04:23

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General

  • Target

    9513433ce6dbc871cdcca5cfb9be3c3b3f023331553f5b7bb996b47e1c39c316.exe

  • Size

    121KB

  • MD5

    a846277644734a79f5367050e39508dd

  • SHA1

    cecc43a1fab79846fb2a1790a95ac6a4c5d66579

  • SHA256

    9513433ce6dbc871cdcca5cfb9be3c3b3f023331553f5b7bb996b47e1c39c316

  • SHA512

    92b9a790e192b68afae0a2b5cfd3d29de41fcb4e5f2724f2f468790afce7b95b7ffe8124784f9d3552b97fdf75ff534723bffefe99ccbb6f8fb789bbd46faf47

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk 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.");};

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 50 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9513433ce6dbc871cdcca5cfb9be3c3b3f023331553f5b7bb996b47e1c39c316.exe
    "C:\Users\Admin\AppData\Local\Temp\9513433ce6dbc871cdcca5cfb9be3c3b3f023331553f5b7bb996b47e1c39c316.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:2300
    • C:\Users\Admin\AppData\Local\Temp\GaXXfGGstrep.exe
      "C:\Users\Admin\AppData\Local\Temp\GaXXfGGstrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:3352
    • C:\Users\Admin\AppData\Local\Temp\MZVdYWAsnlan.exe
      "C:\Users\Admin\AppData\Local\Temp\MZVdYWAsnlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2976
    • C:\Users\Admin\AppData\Local\Temp\EJrHskmnslan.exe
      "C:\Users\Admin\AppData\Local\Temp\EJrHskmnslan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:3912
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:22776
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:23912
  • C:\Windows\system32\MusNotifyIcon.exe
    %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
    1⤵
    • Checks processor information in registry
    PID:1816
  • C:\Windows\System32\svchost.exe
    C:\Windows\System32\svchost.exe -k NetworkService -p
    1⤵
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    PID:2556
  • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
    C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
    1⤵
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:14528

Network

MITRE ATT&CK Enterprise v6

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