Analysis

  • max time kernel
    180s
  • max time network
    220s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 06:20

General

  • Target

    683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb.exe

  • Size

    190KB

  • MD5

    65865d94596a90b7e6204deb1de53c3d

  • SHA1

    282e3776f86d3b0b2916ed6047ad272fe2f0cf6e

  • SHA256

    683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb

  • SHA512

    3c148f68856bf284f1775eb67a47ba880d4f69f8d6180a436a860484935c05d95ba5a3ff13e9c4280bb553f49e4f818ffce6e0a6016323d836cabe69bf8be7f5

Score
10/10

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note
<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html�������������������������������������������������������������������������������������������������������������������������������������������������������

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Enumerates connected drives 3 TTPs 2 IoCs

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

  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 50 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb.exe
    "C:\Users\Admin\AppData\Local\Temp\683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb.exe"
    1⤵
    • Checks computer location settings
    • Enumerates connected drives
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1308
    • C:\Users\Admin\AppData\Local\Temp\HPAQGPd.exe
      "C:\Users\Admin\AppData\Local\Temp\HPAQGPd.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:640
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4264
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          4⤵
            PID:4392
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4324
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            4⤵
              PID:4396
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:3416
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3280
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3636
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:3224
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:3304
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                3⤵
                  PID:3844
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1992
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:3288
              • C:\Windows\system32\MusNotifyIcon.exe
                %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
                1⤵
                • Checks processor information in registry
                PID:3048
              • C:\Windows\System32\svchost.exe
                C:\Windows\System32\svchost.exe -k NetworkService -p
                1⤵
                • Drops file in Windows directory
                • Modifies data under HKEY_USERS
                PID:3036

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys\08e575673cce10c72090304839888e02_0d751396-3164-4736-b931-4f59d47ff1f2
                MD5

                93a5aadeec082ffc1bca5aa27af70f52

                SHA1

                47a92aee3ea4d1c1954ed4da9f86dd79d9277d31

                SHA256

                a1a21799e98f97f271657ce656076f33dcb020d9370f1f2671d783cafd230294

                SHA512

                df388c8d83e779e006d6311b2046fcf9259ec33d379fc0e2c6a4b6b90418f587a12c5c23acd488413a02568ca2d3effe04608ec7c791925c7ed53dc71093ca45

              • C:\Users\Admin\AppData\Local\Temp\HPAQGPd.exe
                MD5

                65865d94596a90b7e6204deb1de53c3d

                SHA1

                282e3776f86d3b0b2916ed6047ad272fe2f0cf6e

                SHA256

                683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb

                SHA512

                3c148f68856bf284f1775eb67a47ba880d4f69f8d6180a436a860484935c05d95ba5a3ff13e9c4280bb553f49e4f818ffce6e0a6016323d836cabe69bf8be7f5

              • C:\Users\Admin\AppData\Local\Temp\HPAQGPd.exe
                MD5

                65865d94596a90b7e6204deb1de53c3d

                SHA1

                282e3776f86d3b0b2916ed6047ad272fe2f0cf6e

                SHA256

                683c3cdeda665afca5af0d964d280f27b3fbb77185b0a24584e139c33c5edddb

                SHA512

                3c148f68856bf284f1775eb67a47ba880d4f69f8d6180a436a860484935c05d95ba5a3ff13e9c4280bb553f49e4f818ffce6e0a6016323d836cabe69bf8be7f5