Analysis

  • max time kernel
    189s
  • max time network
    202s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220112
  • submitted
    20-02-2022 01:21

General

  • Target

    ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4.exe

  • Size

    72KB

  • MD5

    777d9d83da40ed1481d9f0646b4b0a3d

  • SHA1

    6c817e64a04620eddd9b73ed894a76afac484b94

  • SHA256

    ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4

  • SHA512

    f0ae9cd13ec35b7cfa4dda91637c683b1074faff99fbff8448b8dd90fac2c0be1fa2304f90bbea4695fa196724f36767f2f40f5a1e6a95e3cf6c14ecea2754b6

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�������������������������������������������������������������������������������������������������������������������������������������������������������

Extracted

Path

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

Family

ryuk

Ransom Note
[email protected] balance of shadow universe Ryuk

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 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 49 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\ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4.exe
    "C:\Users\Admin\AppData\Local\Temp\ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1860
    • C:\Users\Admin\AppData\Local\Temp\hlxbvcB.exe
      "C:\Users\Admin\AppData\Local\Temp\hlxbvcB.exe" 8 LAN
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1752
      • C:\Windows\SysWOW64\net.exe
        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4236
        • C:\Windows\SysWOW64\net1.exe
          C:\Windows\system32\net1 stop "audioendpointbuilder" /y
          4⤵
            PID:4288
        • C:\Windows\SysWOW64\net.exe
          "C:\Windows\System32\net.exe" stop "samss" /y
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:4312
          • C:\Windows\SysWOW64\net1.exe
            C:\Windows\system32\net1 stop "samss" /y
            4⤵
              PID:4376
        • 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:3448
          • C:\Windows\SysWOW64\net.exe
            "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
            2⤵
            • Suspicious use of WriteProcessMemory
            PID:3728
            • C:\Windows\SysWOW64\net1.exe
              C:\Windows\system32\net1 stop "audioendpointbuilder" /y
              3⤵
                PID:2580
            • C:\Windows\SysWOW64\net.exe
              "C:\Windows\System32\net.exe" stop "samss" /y
              2⤵
              • Suspicious use of WriteProcessMemory
              PID:3288
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 stop "samss" /y
                3⤵
                  PID:3040
              • C:\Windows\SysWOW64\net.exe
                "C:\Windows\System32\net.exe" stop "samss" /y
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2236
                • C:\Windows\SysWOW64\net1.exe
                  C:\Windows\system32\net1 stop "samss" /y
                  3⤵
                    PID:2452
              • C:\Windows\system32\MusNotifyIcon.exe
                %systemroot%\system32\MusNotifyIcon.exe NotifyTrayIcon 13
                1⤵
                • Checks processor information in registry
                PID:2492
              • 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:2604

              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\RyukReadMe.html

                MD5

                62429300ef3f095ae37a58b737c60ab5

                SHA1

                6036c4e454eb6fed69504e7a5ae2227153757e93

                SHA256

                dbcb799862fb04f74c3a3fd880a35a3f87c1a5d87ee57235f84c33bf51a97b46

                SHA512

                028db4e3928a3d7a4eb7377a423d700e1c9c52c0da147690ae3d373274e08b20896d4732b1e647f441be74fce9dafa5f17434f79bdb977595a635a7cafd182a4

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

                MD5

                777d9d83da40ed1481d9f0646b4b0a3d

                SHA1

                6c817e64a04620eddd9b73ed894a76afac484b94

                SHA256

                ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4

                SHA512

                f0ae9cd13ec35b7cfa4dda91637c683b1074faff99fbff8448b8dd90fac2c0be1fa2304f90bbea4695fa196724f36767f2f40f5a1e6a95e3cf6c14ecea2754b6

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

                MD5

                777d9d83da40ed1481d9f0646b4b0a3d

                SHA1

                6c817e64a04620eddd9b73ed894a76afac484b94

                SHA256

                ddc41e15773815f293b5a61e505e37dff0e05e9e195e4dd2e2eaab932b9582d4

                SHA512

                f0ae9cd13ec35b7cfa4dda91637c683b1074faff99fbff8448b8dd90fac2c0be1fa2304f90bbea4695fa196724f36767f2f40f5a1e6a95e3cf6c14ecea2754b6