Analysis

  • max time kernel
    119s
  • max time network
    116s
  • platform
    windows11_x64
  • resource
    win11
  • submitted
    28-01-2022 14:58

General

  • Target

    execute.exe

  • Size

    196KB

  • MD5

    484a2bcb1335ac97ee91194f4c0964bc

  • SHA1

    ad11ed52ab33ad05eb9b1e9ade134ca1348acc81

  • SHA256

    40b865d1c3ab1b8544bcf57c88edd30679870d40b27d62feb237a19f0c5f9cd1

  • SHA512

    6e61612bd29425c5ab9b648fa83bc2d8616071247f8659aa316ab9d4adde0a9ceb9301737bb4216db223dfdd371106da75463f6d7e3a88e1c4cdd6c821f3935f

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:\$WinREAgent\Scratch\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
  • Modifies file permissions 1 TTPs 4 IoCs
  • 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.

  • Modifies data under HKEY_USERS 41 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\System32\smartscreen.exe
    C:\Windows\System32\smartscreen.exe -Embedding
    1⤵
      PID:4664
    • C:\Windows\system32\DllHost.exe
      C:\Windows\system32\DllHost.exe /Processid:{973D20D7-562D-44B9-B70B-5A0F49CCDF3F}
      1⤵
        PID:4348
      • C:\Windows\system32\DllHost.exe
        C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
        1⤵
          PID:3312
        • C:\Windows\System32\RuntimeBroker.exe
          C:\Windows\System32\RuntimeBroker.exe -Embedding
          1⤵
            PID:4088
          • C:\Windows\system32\svchost.exe
            C:\Windows\system32\svchost.exe -k UdkSvcGroup -s UdkUserSvc
            1⤵
              PID:4052
            • C:\Windows\System32\RuntimeBroker.exe
              C:\Windows\System32\RuntimeBroker.exe -Embedding
              1⤵
                PID:3928
              • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
                "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
                1⤵
                  PID:3776
                • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
                  "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
                  1⤵
                    PID:3752
                  • C:\Windows\system32\svchost.exe
                    C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
                    1⤵
                      PID:3392
                    • C:\Windows\system32\svchost.exe
                      C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
                      1⤵
                        PID:3092
                      • C:\Windows\system32\sihost.exe
                        sihost.exe
                        1⤵
                          PID:3080
                        • C:\Users\Admin\AppData\Local\Temp\execute.exe
                          "C:\Users\Admin\AppData\Local\Temp\execute.exe"
                          1⤵
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of WriteProcessMemory
                          PID:4068
                          • C:\Users\Admin\AppData\Local\Temp\HrjRHtq.exe
                            "C:\Users\Admin\AppData\Local\Temp\HrjRHtq.exe" 8 LAN
                            2⤵
                            • Executes dropped EXE
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of WriteProcessMemory
                            PID:4316
                            • C:\Windows\SysWOW64\icacls.exe
                              icacls "C:\*" /grant Everyone:F /T /C /Q
                              3⤵
                              • Modifies file permissions
                              PID:4272
                            • C:\Windows\SysWOW64\icacls.exe
                              icacls "D:\*" /grant Everyone:F /T /C /Q
                              3⤵
                              • Modifies file permissions
                              PID:4504
                            • C:\Windows\SysWOW64\cmd.exe
                              cmd /c "WMIC.exe shadowcopy delet"
                              3⤵
                              • Suspicious use of WriteProcessMemory
                              PID:4964
                              • C:\Windows\SysWOW64\Wbem\WMIC.exe
                                WMIC.exe shadowcopy delet
                                4⤵
                                • Suspicious use of AdjustPrivilegeToken
                                PID:2392
                            • C:\Windows\SysWOW64\net.exe
                              "C:\Windows\System32\net.exe" stop "samss" /y
                              3⤵
                              • Suspicious use of WriteProcessMemory
                              PID:864
                              • C:\Windows\SysWOW64\net1.exe
                                C:\Windows\system32\net1 stop "samss" /y
                                4⤵
                                  PID:1960
                              • 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\HrjRHtq.exe" /f /reg:64
                                3⤵
                                  PID:11028
                                  • 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\HrjRHtq.exe" /f /reg:64
                                    4⤵
                                    • Adds Run key to start application
                                    PID:11080
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                  3⤵
                                    PID:23784
                                    • C:\Windows\SysWOW64\net1.exe
                                      C:\Windows\system32\net1 stop "samss" /y
                                      4⤵
                                        PID:23844
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                    2⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:2252
                                    • C:\Windows\SysWOW64\net1.exe
                                      C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                      3⤵
                                        PID:5100
                                    • C:\Windows\SysWOW64\net.exe
                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:2768
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:2292
                                      • C:\Windows\SysWOW64\cmd.exe
                                        cmd /c "WMIC.exe shadowcopy delet"
                                        2⤵
                                        • Suspicious use of WriteProcessMemory
                                        PID:1208
                                        • C:\Windows\SysWOW64\Wbem\WMIC.exe
                                          WMIC.exe shadowcopy delet
                                          3⤵
                                          • Suspicious use of AdjustPrivilegeToken
                                          PID:1116
                                      • C:\Windows\SysWOW64\icacls.exe
                                        icacls "D:\*" /grant Everyone:F /T /C /Q
                                        2⤵
                                        • Modifies file permissions
                                        PID:1088
                                      • C:\Windows\SysWOW64\icacls.exe
                                        icacls "C:\*" /grant Everyone:F /T /C /Q
                                        2⤵
                                        • Modifies file permissions
                                        PID:3604
                                      • 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\execute.exe" /f /reg:64
                                        2⤵
                                          PID:3432
                                          • 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\execute.exe" /f /reg:64
                                            3⤵
                                            • Adds Run key to start application
                                            PID:5508
                                        • C:\Windows\SysWOW64\net.exe
                                          "C:\Windows\System32\net.exe" stop "samss" /y
                                          2⤵
                                          • Suspicious use of WriteProcessMemory
                                          PID:4060
                                          • C:\Windows\SysWOW64\net1.exe
                                            C:\Windows\system32\net1 stop "samss" /y
                                            3⤵
                                              PID:1600
                                          • C:\Windows\SysWOW64\net.exe
                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                            2⤵
                                              PID:13036
                                              • C:\Windows\SysWOW64\net1.exe
                                                C:\Windows\system32\net1 stop "samss" /y
                                                3⤵
                                                  PID:13088
                                              • C:\Windows\SysWOW64\net.exe
                                                "C:\Windows\System32\net.exe" stop "samss" /y
                                                2⤵
                                                  PID:28828
                                                  • C:\Windows\SysWOW64\net1.exe
                                                    C:\Windows\system32\net1 stop "samss" /y
                                                    3⤵
                                                      PID:28876
                                                • C:\Windows\System32\WaaSMedicAgent.exe
                                                  C:\Windows\System32\WaaSMedicAgent.exe ebb76f6228fba99d4c189e72de9bee88 lkuT3gP0T0Wv5BcugIWdaQ.0.1.0.3.0
                                                  1⤵
                                                  • Modifies data under HKEY_USERS
                                                  PID:4856
                                                • C:\Windows\system32\vssvc.exe
                                                  C:\Windows\system32\vssvc.exe
                                                  1⤵
                                                  • Suspicious use of AdjustPrivilegeToken
                                                  PID:2036

                                                Network

                                                MITRE ATT&CK Enterprise v6

                                                Replay Monitor

                                                Loading Replay Monitor...

                                                Downloads