Analysis

  • max time kernel
    176s
  • max time network
    215s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    20-02-2022 05:44

General

  • Target

    7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9.exe

  • Size

    191KB

  • MD5

    708f63f5ef0bafa61743f242f470480f

  • SHA1

    96233bf3b488a31852b8e32f7cb91dd5d935f9c2

  • SHA256

    7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9

  • SHA512

    5e202f916430e179373c814e2b2cefbb993b83c597776afecea731c190f3aec1ce21c76ce1786afc8ab5d92c060201ce0828b9ac81d709407a8b6358146260c9

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.

  • Adds Run key to start application 2 TTPs 4 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 18 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\System32\RuntimeBroker.exe
    C:\Windows\System32\RuntimeBroker.exe -Embedding
    1⤵
      PID:3408
    • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
      "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
      1⤵
        PID:3344
      • C:\Windows\System32\RuntimeBroker.exe
        C:\Windows\System32\RuntimeBroker.exe -Embedding
        1⤵
          PID:3672
        • C:\Windows\system32\backgroundTaskHost.exe
          "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
          1⤵
            PID:1084
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:3580
            • C:\Windows\System32\RuntimeBroker.exe
              C:\Windows\System32\RuntimeBroker.exe -Embedding
              1⤵
                PID:3688
              • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
                "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
                1⤵
                  PID:3496
                • C:\Windows\system32\DllHost.exe
                  C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
                  1⤵
                    PID:3240
                  • C:\Windows\system32\svchost.exe
                    C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
                    1⤵
                      PID:764
                    • C:\Windows\system32\taskhostw.exe
                      taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                      1⤵
                        PID:2416
                      • C:\Windows\system32\svchost.exe
                        C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
                        1⤵
                          PID:2324
                        • C:\Windows\system32\sihost.exe
                          sihost.exe
                          1⤵
                            PID:2288
                          • C:\Users\Admin\AppData\Local\Temp\7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9.exe
                            "C:\Users\Admin\AppData\Local\Temp\7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9.exe"
                            1⤵
                            • Checks computer location settings
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of WriteProcessMemory
                            PID:4608
                            • C:\Users\Admin\AppData\Local\Temp\oChGcDY.exe
                              "C:\Users\Admin\AppData\Local\Temp\oChGcDY.exe" 8 LAN
                              2⤵
                              • Executes dropped EXE
                              • Checks computer location settings
                              • Suspicious behavior: EnumeratesProcesses
                              • Suspicious use of AdjustPrivilegeToken
                              • Suspicious use of WriteProcessMemory
                              PID:312
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "samss" /y
                                3⤵
                                • Suspicious use of WriteProcessMemory
                                PID:4760
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "samss" /y
                                  4⤵
                                    PID:2036
                                • C:\Windows\SysWOW64\cmd.exe
                                  "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\oChGcDY.exe" /f /reg:64
                                  3⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:5228
                                  • C:\Windows\SysWOW64\reg.exe
                                    REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\oChGcDY.exe" /f /reg:64
                                    4⤵
                                    • Adds Run key to start application
                                    PID:5288
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                2⤵
                                • Suspicious use of WriteProcessMemory
                                PID:4196
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                  3⤵
                                    PID:2428
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                  2⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:1492
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    3⤵
                                      PID:696
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:1232
                                    • C:\Windows\SysWOW64\net1.exe
                                      C:\Windows\system32\net1 stop "samss" /y
                                      3⤵
                                        PID:5024
                                    • C:\Windows\SysWOW64\cmd.exe
                                      "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9.exe" /f /reg:64
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:3628
                                      • C:\Windows\SysWOW64\reg.exe
                                        REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "svchos" /t REG_SZ /d "C:\Users\Admin\AppData\Local\Temp\7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9.exe" /f /reg:64
                                        3⤵
                                        • Adds Run key to start application
                                        PID:4100
                                    • C:\Windows\SysWOW64\net.exe
                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:3952
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:1820
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                        2⤵
                                        • Suspicious use of WriteProcessMemory
                                        PID:5328
                                        • C:\Windows\SysWOW64\net1.exe
                                          C:\Windows\system32\net1 stop "samss" /y
                                          3⤵
                                            PID:5392
                                        • C:\Windows\SysWOW64\net.exe
                                          "C:\Windows\System32\net.exe" stop "samss" /y
                                          2⤵
                                            PID:11108
                                            • C:\Windows\SysWOW64\net1.exe
                                              C:\Windows\system32\net1 stop "samss" /y
                                              3⤵
                                                PID:11188
                                            • C:\Windows\SysWOW64\net.exe
                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                              2⤵
                                                PID:11224
                                                • C:\Windows\SysWOW64\net1.exe
                                                  C:\Windows\system32\net1 stop "samss" /y
                                                  3⤵
                                                    PID:10784

                                              Network

                                              MITRE ATT&CK Matrix ATT&CK v6

                                              Persistence

                                              Registry Run Keys / Startup Folder

                                              1
                                              T1060

                                              Defense Evasion

                                              Modify Registry

                                              1
                                              T1112

                                              Discovery

                                              Query Registry

                                              1
                                              T1012

                                              System Information Discovery

                                              2
                                              T1082

                                              Replay Monitor

                                              Loading Replay Monitor...

                                              Downloads

                                              • C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys\08e575673cce10c72090304839888e02_e269d2c1-0edf-4391-ac7b-818b8e88b04f
                                                MD5

                                                93a5aadeec082ffc1bca5aa27af70f52

                                                SHA1

                                                47a92aee3ea4d1c1954ed4da9f86dd79d9277d31

                                                SHA256

                                                a1a21799e98f97f271657ce656076f33dcb020d9370f1f2671d783cafd230294

                                                SHA512

                                                df388c8d83e779e006d6311b2046fcf9259ec33d379fc0e2c6a4b6b90418f587a12c5c23acd488413a02568ca2d3effe04608ec7c791925c7ed53dc71093ca45

                                              • C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html
                                                MD5

                                                b99d47f48bba763d4eded8882f9d3fae

                                                SHA1

                                                aa0b195e158e91b93ea7aa97c3f02461b86b0163

                                                SHA256

                                                577cfa8bd59e6c4b007b33f03fffe15adf180ca48b121bfe6a837cf481a234fb

                                                SHA512

                                                ce3186e760f8c441a14a01cb52ed147985946d5a672095024aade10db7238ef38ee71fecbe2b3266a0c5018f694c79f28e4a87849861c1ba74a307240548714b

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

                                                708f63f5ef0bafa61743f242f470480f

                                                SHA1

                                                96233bf3b488a31852b8e32f7cb91dd5d935f9c2

                                                SHA256

                                                7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9

                                                SHA512

                                                5e202f916430e179373c814e2b2cefbb993b83c597776afecea731c190f3aec1ce21c76ce1786afc8ab5d92c060201ce0828b9ac81d709407a8b6358146260c9

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

                                                708f63f5ef0bafa61743f242f470480f

                                                SHA1

                                                96233bf3b488a31852b8e32f7cb91dd5d935f9c2

                                                SHA256

                                                7433f2a47d324d386ed215930ab6607a7cce28d5cef868afe994582c409e5dc9

                                                SHA512

                                                5e202f916430e179373c814e2b2cefbb993b83c597776afecea731c190f3aec1ce21c76ce1786afc8ab5d92c060201ce0828b9ac81d709407a8b6358146260c9