Analysis

  • max time kernel
    179s
  • max time network
    202s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 05:10

General

  • Target

    827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa.exe

  • Size

    189KB

  • MD5

    22d2811ba73d9f43086700fe22991c81

  • SHA1

    6a7efe4137e953c74de48f3c32019c5a70c644dd

  • SHA256

    827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa

  • SHA512

    fed438621fec75371a46b28011ca8f36cc17ed12a6b6f9e077bb8f460f8bda5419dad2e6f64fc464d7e3ffcfe0a7e2b9e64e5e01778130d6bbbe1d71510e30e5

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.

  • Drops file in Windows directory 2 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 45 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 39 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa.exe
    "C:\Users\Admin\AppData\Local\Temp\827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3872
    • C:\Users\Admin\AppData\Local\Temp\MrqgTNI.exe
      "C:\Users\Admin\AppData\Local\Temp\MrqgTNI.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3088
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4148
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          4⤵
            PID:4248
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4204
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            4⤵
              PID:4276
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4084
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
            3⤵
              PID:3452
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "samss" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3568
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "samss" /y
              3⤵
                PID:692
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:3760
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                3⤵
                  PID:2224
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1532
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:3596
              • C:\Windows\system32\MusNotifyIcon.exe
                %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
                1⤵
                • Checks processor information in registry
                PID:3768
              • 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:1892
              • C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
                C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
                1⤵
                • Drops file in Windows directory
                • Suspicious use of AdjustPrivilegeToken
                PID:3684

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              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\MrqgTNI.exe

                MD5

                22d2811ba73d9f43086700fe22991c81

                SHA1

                6a7efe4137e953c74de48f3c32019c5a70c644dd

                SHA256

                827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa

                SHA512

                fed438621fec75371a46b28011ca8f36cc17ed12a6b6f9e077bb8f460f8bda5419dad2e6f64fc464d7e3ffcfe0a7e2b9e64e5e01778130d6bbbe1d71510e30e5

              • C:\Users\Admin\AppData\Local\Temp\MrqgTNI.exe

                MD5

                22d2811ba73d9f43086700fe22991c81

                SHA1

                6a7efe4137e953c74de48f3c32019c5a70c644dd

                SHA256

                827b7e7ec7ca366fc31f3899a98339dfb4333073f197a5aa6755c8c09505bdfa

                SHA512

                fed438621fec75371a46b28011ca8f36cc17ed12a6b6f9e077bb8f460f8bda5419dad2e6f64fc464d7e3ffcfe0a7e2b9e64e5e01778130d6bbbe1d71510e30e5