Analysis

  • max time kernel
    150s
  • max time network
    85s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    30-03-2021 09:19

General

  • Target

    b218ea35335833ba6dab543183314754db42bace4e62cf5950447c743b0ea4f6.exe

  • Size

    322KB

  • MD5

    d5793b66a9a31f2ebfea5f9804d77dab

  • SHA1

    4f98055913500597daba98d6fd6321d007a4c271

  • SHA256

    b218ea35335833ba6dab543183314754db42bace4e62cf5950447c743b0ea4f6

  • SHA512

    06dd7deaee850fe4fc48bb8e1f5fd7b7f152ec922318953a4ef61b18ba1f5e60785dbb3b6d14d87b4e61613bfdee2d23a6043213411d2b788a6736286db9170a

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'rikzcUO'; $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.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 6 IoCs
  • Modifies file permissions 1 TTPs 2 IoCs
  • Drops desktop.ini file(s) 1 IoCs
  • 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 2 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b218ea35335833ba6dab543183314754db42bace4e62cf5950447c743b0ea4f6.exe
    "C:\Users\Admin\AppData\Local\Temp\b218ea35335833ba6dab543183314754db42bace4e62cf5950447c743b0ea4f6.exe"
    1⤵
    • Loads dropped DLL
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:324
    • C:\Users\Admin\AppData\Local\Temp\faDghoHJSrep.exe
      "C:\Users\Admin\AppData\Local\Temp\faDghoHJSrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:824
    • C:\Users\Admin\AppData\Local\Temp\bnXrcsOumlan.exe
      "C:\Users\Admin\AppData\Local\Temp\bnXrcsOumlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1400
    • C:\Users\Admin\AppData\Local\Temp\kHGemHxSXlan.exe
      "C:\Users\Admin\AppData\Local\Temp\kHGemHxSXlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:2576
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2660
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2672
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3412
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:3500
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3444
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:3492
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3520
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3560
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3592
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3632

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/324-5-0x00000000766C1000-0x00000000766C3000-memory.dmp

            Filesize

            8KB

          • memory/324-3-0x0000000000020000-0x000000000003F000-memory.dmp

            Filesize

            124KB

          • memory/324-2-0x0000000000430000-0x0000000000441000-memory.dmp

            Filesize

            68KB

          • memory/324-4-0x0000000035000000-0x0000000035028000-memory.dmp

            Filesize

            160KB

          • memory/824-10-0x0000000000530000-0x0000000000541000-memory.dmp

            Filesize

            68KB

          • memory/1400-17-0x0000000000590000-0x00000000005A1000-memory.dmp

            Filesize

            68KB

          • memory/2576-30-0x0000000000450000-0x0000000000461000-memory.dmp

            Filesize

            68KB