Overview

overview

10

Static

static

473bcbcba1...e8.exe

windows7_x64

10

473bcbcba1...e8.exe

windows10_x64

10

Analysis

  • max time kernel
    149s
  • max time network
    47s
  • platform
    windows7_x64
  • resource
    win7v20210408
  • submitted
    10-07-2021 10:37

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General

  • Target

    473bcbcba12296b08b765b4f7c2beea5f56f263d5e6c0d15c1006af28f6172e8.exe

  • Size

    116KB

  • MD5

    5c6273b024c93c5bdf557813868f9337

  • SHA1

    eafe0287e6ae983c6f1ff68f6c7780cc3a037783

  • SHA256

    473bcbcba12296b08b765b4f7c2beea5f56f263d5e6c0d15c1006af28f6172e8

  • SHA512

    4164f5d7f485cc95825cd6608e0a58eadd456d00145bc3b73d3526e07faaf9d416d03e9a62c8c789db447549421cfc2db73f54f5cd3dabc1238c5da9727c2408

Score
10/10
ryukdiscoveryransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'nyMTcbyxt'; $torlink = 'http://lgjpuim5fe3pejmllygcffape3djui6k2a5pcbpuyvps3h4ajb7yf4id.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://lgjpuim5fe3pejmllygcffape3djui6k2a5pcbpuyvps3h4ajb7yf4id.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

    ransomwareryuk
  • Loads dropped DLL 10 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
    discovery
  • Drops desktop.ini file(s) 1 IoCs
  • Enumerates connected drives 3 TTPs 24 IoCs

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

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 13 IoCs
  • Modifies registry class 7 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 25 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\473bcbcba12296b08b765b4f7c2beea5f56f263d5e6c0d15c1006af28f6172e8.exe
    "C:\Users\Admin\AppData\Local\Temp\473bcbcba12296b08b765b4f7c2beea5f56f263d5e6c0d15c1006af28f6172e8.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious use of WriteProcessMemory
    PID:1240
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1780
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:1704
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Loads dropped DLL
    • Enumerates connected drives
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1972
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding B1F85638DC96AA29E1A74D125F0332B2
      2⤵
      • Loads dropped DLL
      PID:1560
    • C:\Windows\system32\MsiExec.exe
      C:\Windows\system32\MsiExec.exe -Embedding 85E90F771554D0D0435E7881BB03FCF1
      2⤵
      • Loads dropped DLL
      PID:2144

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1240-60-0x0000000074D91000-0x0000000074D93000-memory.dmp

    Filesize

    8KB

    Download

  • memory/1972-127-0x000007FEFB681000-0x000007FEFB683000-memory.dmp

    Filesize

    8KB

    Download