Analysis

  • max time kernel
    115s
  • max time network
    159s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    09-08-2021 08:21

Errors

Reason
Remote task has failed: Machine shutdown

General

  • Target

    7faeb64c50cd15d036ca259a047d6c62ed491fff3729433fefba0b02c059d5ed.exe

  • Size

    273KB

  • MD5

    0eed6a270c65ab473f149b8b13c46c68

  • SHA1

    bffb380ef3952770464823d55d0f4dfa6ab0b8df

  • SHA256

    7faeb64c50cd15d036ca259a047d6c62ed491fff3729433fefba0b02c059d5ed

  • SHA512

    1edc5af819e0a604bef31bca55efeea4d50f089aa6bdd67afee00a10132b00172a82cda214ea0ca8164b8d7444d648984c27c45f27acc69e227188ec25064aff

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note
contact balance of shadow universe Ryuk $password = 'lRwc4TXe'; $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 3 IoCs
  • Modifies file permissions 1 TTPs 2 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\7faeb64c50cd15d036ca259a047d6c62ed491fff3729433fefba0b02c059d5ed.exe
    "C:\Users\Admin\AppData\Local\Temp\7faeb64c50cd15d036ca259a047d6c62ed491fff3729433fefba0b02c059d5ed.exe"
    1⤵
    • Loads dropped DLL
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1268
    • C:\Users\Admin\AppData\Local\Temp\bLYVPWLORrep.exe
      "C:\Users\Admin\AppData\Local\Temp\bLYVPWLORrep.exe" 9 REP
      2⤵
      • Executes dropped EXE
      PID:1716
    • C:\Users\Admin\AppData\Local\Temp\bhSWXvhqZlan.exe
      "C:\Users\Admin\AppData\Local\Temp\bhSWXvhqZlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:572
    • C:\Users\Admin\AppData\Local\Temp\XzHZOxtwqlan.exe
      "C:\Users\Admin\AppData\Local\Temp\XzHZOxtwqlan.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      PID:1008
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2604
    • C:\Windows\SysWOW64\icacls.exe
      icacls "D:\*" /grant Everyone:F /T /C /Q
      2⤵
      • Modifies file permissions
      PID:2616
    • C:\Windows\SysWOW64\net.exe
      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3096
      • C:\Windows\SysWOW64\net1.exe
        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
        3⤵
          PID:3132
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "samss" /y
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:3244
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "samss" /y
          3⤵
            PID:3652
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3552
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3592
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3664
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3708
          • C:\Windows\system32\LogonUI.exe
            "LogonUI.exe" /flags:0x0
            1⤵
              PID:3376
            • C:\Windows\system32\LogonUI.exe
              "LogonUI.exe" /flags:0x1
              1⤵
                PID:3228

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • memory/1268-62-0x0000000035000000-0x0000000035060000-memory.dmp

                Filesize

                384KB

              • memory/1268-61-0x0000000000250000-0x0000000000251000-memory.dmp

                Filesize

                4KB

              • memory/1268-60-0x0000000075D41000-0x0000000075D43000-memory.dmp

                Filesize

                8KB

              • memory/3228-145-0x00000000026E0000-0x00000000026E1000-memory.dmp

                Filesize

                4KB

              • memory/3376-142-0x000007FEFB931000-0x000007FEFB933000-memory.dmp

                Filesize

                8KB

              • memory/3376-143-0x0000000002840000-0x0000000002841000-memory.dmp

                Filesize

                4KB