Analysis

  • max time kernel
    244s
  • max time network
    264s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    20-02-2022 01:31

General

  • Target

    d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe

  • Size

    192KB

  • MD5

    9c2f2398a853063303817e181b7cd140

  • SHA1

    f0c032844d33537e7f270374f1f1c28ef7670683

  • SHA256

    d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

  • SHA512

    4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

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 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\sihost.exe
    sihost.exe
    1⤵
      PID:2304
    • C:\Windows\system32\svchost.exe
      C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
      1⤵
        PID:2340
      • C:\Windows\system32\DllHost.exe
        C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
        1⤵
          PID:3252
        • 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:3424
            • C:\Windows\system32\svchost.exe
              C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
              1⤵
                PID:1304
              • C:\Windows\System32\RuntimeBroker.exe
                C:\Windows\System32\RuntimeBroker.exe -Embedding
                1⤵
                  PID:3760
                • C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe
                  "C:\Windows\SystemApps\Microsoft.Windows.Search_cw5n1h2txyewy\SearchApp.exe" -ServerName:CortanaUI.AppX8z9r6jm96hw4bsbneegw0kyxx296wr9t.mca
                  1⤵
                    PID:3504
                  • C:\Windows\System32\RuntimeBroker.exe
                    C:\Windows\System32\RuntimeBroker.exe -Embedding
                    1⤵
                      PID:3180
                    • C:\Windows\System32\RuntimeBroker.exe
                      C:\Windows\System32\RuntimeBroker.exe -Embedding
                      1⤵
                        PID:4180
                      • C:\Windows\system32\backgroundTaskHost.exe
                        "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
                        1⤵
                          PID:2752
                        • C:\Windows\system32\taskhostw.exe
                          taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
                          1⤵
                            PID:2420
                          • C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe
                            "C:\Users\Admin\AppData\Local\Temp\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe"
                            1⤵
                            • Checks computer location settings
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of WriteProcessMemory
                            PID:1712
                            • C:\Users\Admin\AppData\Local\Temp\SwSTcwJ.exe
                              "C:\Users\Admin\AppData\Local\Temp\SwSTcwJ.exe" 8 LAN
                              2⤵
                              • Executes dropped EXE
                              • Checks computer location settings
                              • Suspicious behavior: EnumeratesProcesses
                              • Suspicious use of AdjustPrivilegeToken
                              • Suspicious use of WriteProcessMemory
                              PID:2260
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                3⤵
                                • Suspicious use of WriteProcessMemory
                                PID:3528
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                  4⤵
                                    PID:2824
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                  3⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:392
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "samss" /y
                                    4⤵
                                      PID:4656
                                  • 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\SwSTcwJ.exe" /f /reg:64
                                    3⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:5072
                                    • 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\SwSTcwJ.exe" /f /reg:64
                                      4⤵
                                      • Adds Run key to start application
                                      PID:1300
                                • C:\Windows\SysWOW64\net.exe
                                  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                  2⤵
                                  • Suspicious use of WriteProcessMemory
                                  PID:600
                                  • C:\Windows\SysWOW64\net1.exe
                                    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                    3⤵
                                      PID:2868
                                  • C:\Windows\SysWOW64\net.exe
                                    "C:\Windows\System32\net.exe" stop "samss" /y
                                    2⤵
                                    • Suspicious use of WriteProcessMemory
                                    PID:4848
                                    • C:\Windows\SysWOW64\net1.exe
                                      C:\Windows\system32\net1 stop "samss" /y
                                      3⤵
                                        PID:3108
                                    • C:\Windows\SysWOW64\net.exe
                                      "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:1448
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                        3⤵
                                          PID:2448
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "samss" /y
                                        2⤵
                                        • Suspicious use of WriteProcessMemory
                                        PID:4164
                                        • C:\Windows\SysWOW64\net1.exe
                                          C:\Windows\system32\net1 stop "samss" /y
                                          3⤵
                                            PID:908
                                        • 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\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe" /f /reg:64
                                          2⤵
                                          • Suspicious use of WriteProcessMemory
                                          PID:3368
                                          • 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\d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f.exe" /f /reg:64
                                            3⤵
                                            • Adds Run key to start application
                                            PID:4328
                                        • C:\Windows\SysWOW64\net.exe
                                          "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                          2⤵
                                            PID:2824
                                            • C:\Windows\SysWOW64\net1.exe
                                              C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                              3⤵
                                                PID:5268
                                            • C:\Windows\SysWOW64\net.exe
                                              "C:\Windows\System32\net.exe" stop "samss" /y
                                              2⤵
                                                PID:5292
                                                • C:\Windows\SysWOW64\net1.exe
                                                  C:\Windows\system32\net1 stop "samss" /y
                                                  3⤵
                                                    PID:5776
                                                • C:\Windows\SysWOW64\net.exe
                                                  "C:\Windows\System32\net.exe" stop "samss" /y
                                                  2⤵
                                                    PID:12192
                                                    • C:\Windows\SysWOW64\net1.exe
                                                      C:\Windows\system32\net1 stop "samss" /y
                                                      3⤵
                                                        PID:11616
                                                  • C:\Windows\system32\BackgroundTransferHost.exe
                                                    "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
                                                    1⤵
                                                      PID:3584

                                                    Network

                                                    MITRE ATT&CK Enterprise v6

                                                    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

                                                      5cedf73dbf75099b8abcefc3f07e9975

                                                      SHA1

                                                      2ecabc828715573e9d7aefaf82bfb0e7379e92cc

                                                      SHA256

                                                      beb3695bb9be64d641570104a56889b776cdbebd9c132045c52b9543d1f82b63

                                                      SHA512

                                                      dfe8485e7138ee9d0a03b9f3000bc8513856f82b51d2ef9f7c6be66b28ea0df86521c2b3b3c575f11061b3820758f280a99fbf77e482fa34c3a53c40c3928c56

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

                                                      9c2f2398a853063303817e181b7cd140

                                                      SHA1

                                                      f0c032844d33537e7f270374f1f1c28ef7670683

                                                      SHA256

                                                      d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

                                                      SHA512

                                                      4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319

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

                                                      9c2f2398a853063303817e181b7cd140

                                                      SHA1

                                                      f0c032844d33537e7f270374f1f1c28ef7670683

                                                      SHA256

                                                      d4b8cbfa94bac3dbd58452fcc6c4e0b56b65a54a671a2184d9fb6e3694a0266f

                                                      SHA512

                                                      4ad5d989e5e50c7cd9a5f65de4312fe63e53c97ceddd9b33a4a026c1b2fccdc27ac7406f3ec38132fb6da6c5439396bed2fee482775f55e265934fdc80425319