Analysis

  • max time kernel
    156s
  • max time network
    143s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-en-20220113
  • submitted
    19-02-2022 23:50

General

  • Target

    ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2.exe

  • Size

    114KB

  • MD5

    a9b7b3af239126f1ec4e1549076b6f6a

  • SHA1

    d26ae4e7aac4529370583bb9e401152746d88a41

  • SHA256

    ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2

  • SHA512

    572587a2a5ef1fb275c9059e32191399780311dac2d064a211303f87a768c1acdc903a8d966723ff9b2375ec31a985a55f3623a2631d4dcf83d564e6eb7280ce

Malware Config

Extracted

Path

C:\users\Public\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\Public\RyukReadMe.html

Family

ryuk

Ransom Note
[email protected] balance of shadow universe Ryuk

Signatures

  • Ryuk

    Ransomware distributed via existing botnets, often Trickbot or Emotet.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Executes dropped EXE 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Drops file in Windows directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 27 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Windows\system32\taskhostw.exe
    taskhostw.exe {222A245B-E637-4AE9-A93F-A59CA119A75E}
    1⤵
      PID:3004
    • C:\Windows\System32\RuntimeBroker.exe
      C:\Windows\System32\RuntimeBroker.exe -Embedding
      1⤵
        PID:3456
      • C:\Windows\system32\backgroundTaskHost.exe
        "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:CortanaUI.AppX3bn25b6f886wmg6twh46972vprk9tnbf.mca
        1⤵
          PID:2052
        • C:\Windows\System32\RuntimeBroker.exe
          C:\Windows\System32\RuntimeBroker.exe -Embedding
          1⤵
            PID:692
          • C:\Windows\System32\RuntimeBroker.exe
            C:\Windows\System32\RuntimeBroker.exe -Embedding
            1⤵
              PID:3812
            • 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:3544
                • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
                  "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
                  1⤵
                    PID:3392
                  • C:\Windows\system32\DllHost.exe
                    C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
                    1⤵
                      PID:3304
                    • C:\Windows\system32\svchost.exe
                      C:\Windows\system32\svchost.exe -k ClipboardSvcGroup -p -s cbdhsvc
                      1⤵
                        PID:3088
                      • C:\Windows\system32\svchost.exe
                        C:\Windows\system32\svchost.exe -k UnistackSvcGroup -s CDPUserSvc
                        1⤵
                          PID:2944
                        • C:\Windows\system32\sihost.exe
                          sihost.exe
                          1⤵
                            PID:2912
                          • C:\Users\Admin\AppData\Local\Temp\ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2.exe
                            "C:\Users\Admin\AppData\Local\Temp\ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2.exe"
                            1⤵
                            • Checks computer location settings
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of WriteProcessMemory
                            PID:4424
                            • C:\Users\Admin\AppData\Local\Temp\XUzvJpGsKlan.exe
                              "C:\Users\Admin\AppData\Local\Temp\XUzvJpGsKlan.exe" 8 LAN
                              2⤵
                              • Executes dropped EXE
                              PID:4468
                            • C:\Users\Admin\AppData\Local\Temp\kuKnEoNBKlan.exe
                              "C:\Users\Admin\AppData\Local\Temp\kuKnEoNBKlan.exe" 8 LAN
                              2⤵
                              • Executes dropped EXE
                              PID:544
                            • C:\Users\Admin\AppData\Local\Temp\TdpYQuNjzlan.exe
                              "C:\Users\Admin\AppData\Local\Temp\TdpYQuNjzlan.exe" 8 LAN
                              2⤵
                              • Executes dropped EXE
                              PID:3592
                            • C:\Windows\SysWOW64\cmd.exe
                              cmd.exe /c "bootstatuspolicy ignoreallfailures"
                              2⤵
                                PID:1928
                              • C:\Windows\SysWOW64\icacls.exe
                                icacls "D:\*" /grant Everyone:F /T /C /Q
                                2⤵
                                • Modifies file permissions
                                PID:2116
                              • C:\Windows\SysWOW64\icacls.exe
                                icacls "C:\*" /grant Everyone:F /T /C /Q
                                2⤵
                                • Modifies file permissions
                                PID:3968
                              • C:\Windows\SysWOW64\net.exe
                                "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                2⤵
                                • Suspicious use of WriteProcessMemory
                                PID:2012
                                • C:\Windows\SysWOW64\net1.exe
                                  C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                  3⤵
                                    PID:4612
                                • C:\Windows\SysWOW64\cmd.exe
                                  cmd.exe /c "bcdedit /set {default} recoveryenabled No & bcdedit /set {default}"
                                  2⤵
                                    PID:1784
                                  • C:\Windows\SysWOW64\cmd.exe
                                    cmd.exe /c "vssadmin.exe Delete Shadows /all /quiet"
                                    2⤵
                                      PID:1732
                                    • C:\Windows\SysWOW64\cmd.exe
                                      cmd.exe /c "WMIC.exe shadowcopy delete"
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:1528
                                      • C:\Windows\SysWOW64\Wbem\WMIC.exe
                                        WMIC.exe shadowcopy delete
                                        3⤵
                                        • Suspicious use of AdjustPrivilegeToken
                                        PID:4740
                                    • C:\Windows\SysWOW64\SCHTASKS.exe
                                      SCHTASKS /CREATE /NP /SC DAILY /TN "PrintKm" /TR "C:\Windows\System32\cmd.exe /c for /l %x in (1,1,50) do start wordpad.exe /p C:\users\Public\R3qOi.dll" /ST 10:25 /SD 01/31/2022 /ED 02/07/2022
                                      2⤵
                                      • Creates scheduled task(s)
                                      PID:1372
                                    • C:\Windows\SysWOW64\net.exe
                                      "C:\Windows\System32\net.exe" stop "samss" /y
                                      2⤵
                                      • Suspicious use of WriteProcessMemory
                                      PID:4812
                                      • C:\Windows\SysWOW64\net1.exe
                                        C:\Windows\system32\net1 stop "samss" /y
                                        3⤵
                                          PID:4476
                                      • C:\Windows\SysWOW64\cmd.exe
                                        "C:\Windows\System32\cmd.exe" /C REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "EV" /t REG_SZ /d "￾C:\Users\Admin\AppData\Local\Temp\ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2.exe" /f /reg:64
                                        2⤵
                                        • Suspicious use of WriteProcessMemory
                                        PID:1408
                                        • C:\Windows\SysWOW64\reg.exe
                                          REG ADD "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "EV" /t REG_SZ /d "￾C:\Users\Admin\AppData\Local\Temp\ff90b93b8b79c8fb881b489263d53dd69dd5b98211507a2956885d7c71e086a2.exe" /f /reg:64
                                          3⤵
                                          • Adds Run key to start application
                                          PID:4868
                                      • C:\Windows\SysWOW64\net.exe
                                        "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
                                        2⤵
                                          PID:1644
                                          • C:\Windows\SysWOW64\net1.exe
                                            C:\Windows\system32\net1 stop "audioendpointbuilder" /y
                                            3⤵
                                              PID:4028
                                          • C:\Windows\SysWOW64\net.exe
                                            "C:\Windows\System32\net.exe" stop "samss" /y
                                            2⤵
                                              PID:768
                                              • C:\Windows\SysWOW64\net1.exe
                                                C:\Windows\system32\net1 stop "samss" /y
                                                3⤵
                                                  PID:4816
                                            • C:\Windows\system32\svchost.exe
                                              C:\Windows\system32\svchost.exe -k netsvcs -p -s wuauserv
                                              1⤵
                                              • Drops file in Windows directory
                                              • Suspicious use of AdjustPrivilegeToken
                                              PID:4556
                                            • C:\Windows\system32\BackgroundTransferHost.exe
                                              "BackgroundTransferHost.exe" -ServerName:BackgroundTransferHost.1
                                              1⤵
                                                PID:3512
                                              • C:\Windows\system32\backgroundTaskHost.exe
                                                "C:\Windows\system32\backgroundTaskHost.exe" -ServerName:App.AppXmtcan0h2tfbfy7k9kn8hbxb6dmzz1zh0.mca
                                                1⤵
                                                  PID:4252

                                                Network

                                                MITRE ATT&CK Enterprise v6

                                                Replay Monitor

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                                                Downloads

                                                • memory/4556-133-0x00000192BF990000-0x00000192BF9A0000-memory.dmp

                                                  Filesize

                                                  64KB

                                                • memory/4556-135-0x00000192C2610000-0x00000192C2614000-memory.dmp

                                                  Filesize

                                                  16KB

                                                • memory/4556-134-0x00000192BFF20000-0x00000192BFF30000-memory.dmp

                                                  Filesize

                                                  64KB