Analysis

  • max time kernel
    149s
  • max time network
    139s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240730-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system
  • submitted
    01/08/2024, 02:36

General

  • Target
    5bd5977e894914a21a401042805fec1a.exe
  • Size 3.6MB
  • Sample240801-c3kmtssbka
  • SHA256 88f80fbe352e5778eb8a9d0cb508c888d8a3c88c676455c5a5dc6348f7a427b1
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Process spawned unexpected child process 21 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • UAC bypass 3 TTPs 21 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Checks computer location settings 2 TTPs 7 IoCs

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

  • Executes dropped EXE 6 IoCs
  • Checks whether UAC is enabled 1 TTPs 14 IoCs
  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 7 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 21 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs
  • System policy modification 1 TTPs 21 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\5bd5977e894914a21a401042805fec1a.exe
    "C:\Users\Admin\AppData\Local\Temp\5bd5977e894914a21a401042805fec1a.exe"
    1⤵
    • UAC bypass
    • Checks computer location settings
    • Checks whether UAC is enabled
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4056
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\pThaEkwbyi.bat"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4436
      • C:\Windows\system32\w32tm.exe
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        3⤵
          PID:3136
        • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
          "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
          3⤵
          • UAC bypass
          • Checks computer location settings
          • Executes dropped EXE
          • Checks whether UAC is enabled
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • System policy modification
          PID:2116
          • C:\Windows\System32\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\bed638dd-82a8-4570-911e-01daa542e147.vbs"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1132
            • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
              "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
              5⤵
              • UAC bypass
              • Checks computer location settings
              • Executes dropped EXE
              • Checks whether UAC is enabled
              • Modifies registry class
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              • System policy modification
              PID:5024
              • C:\Windows\System32\WScript.exe
                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\5812943d-5a53-4dfd-864a-929651884e35.vbs"
                6⤵
                • Suspicious use of WriteProcessMemory
                PID:3604
                • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
                  "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
                  7⤵
                  • UAC bypass
                  • Checks computer location settings
                  • Executes dropped EXE
                  • Checks whether UAC is enabled
                  • Modifies registry class
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of WriteProcessMemory
                  • System policy modification
                  PID:4300
                  • C:\Windows\System32\WScript.exe
                    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\547b7465-5087-437c-ba87-55f44b49a5cb.vbs"
                    8⤵
                    • Suspicious use of WriteProcessMemory
                    PID:4892
                    • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
                      "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
                      9⤵
                      • UAC bypass
                      • Checks computer location settings
                      • Executes dropped EXE
                      • Checks whether UAC is enabled
                      • Modifies registry class
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      • System policy modification
                      PID:3504
                      • C:\Windows\System32\WScript.exe
                        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\a1d155ec-a6d1-402d-b038-6bccc9f4dc5f.vbs"
                        10⤵
                        • Suspicious use of WriteProcessMemory
                        PID:4588
                        • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
                          "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
                          11⤵
                          • UAC bypass
                          • Checks computer location settings
                          • Executes dropped EXE
                          • Checks whether UAC is enabled
                          • Modifies registry class
                          • Suspicious behavior: EnumeratesProcesses
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of WriteProcessMemory
                          • System policy modification
                          PID:3060
                          • C:\Windows\System32\WScript.exe
                            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\5d7f481e-c94a-460a-bdf7-c08c78005660.vbs"
                            12⤵
                            • Suspicious use of WriteProcessMemory
                            PID:3720
                            • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
                              "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
                              13⤵
                              • UAC bypass
                              • Checks computer location settings
                              • Executes dropped EXE
                              • Checks whether UAC is enabled
                              • Modifies registry class
                              • Suspicious behavior: EnumeratesProcesses
                              • Suspicious use of AdjustPrivilegeToken
                              • Suspicious use of WriteProcessMemory
                              • System policy modification
                              PID:4904
                              • C:\Windows\System32\WScript.exe
                                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\f5641d3a-cc8b-46da-ad01-9c87775b2f78.vbs"
                                14⤵
                                  PID:3732
                                  • C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe
                                    "C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe"
                                    15⤵
                                      PID:3676
                                  • C:\Windows\System32\WScript.exe
                                    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\5b034f62-9ce9-46d4-8877-1ce1f666fdff.vbs"
                                    14⤵
                                      PID:4408
                                • C:\Windows\System32\WScript.exe
                                  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\ba31ed11-9938-4345-a089-abe657834e56.vbs"
                                  12⤵
                                    PID:4272
                              • C:\Windows\System32\WScript.exe
                                "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\b89b66ef-ba1b-45ee-92d0-ab5eb856aab3.vbs"
                                10⤵
                                  PID:4044
                            • C:\Windows\System32\WScript.exe
                              "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\29a22c75-c2f7-42bc-bbdb-1c772b5ba6fe.vbs"
                              8⤵
                                PID:4560
                          • C:\Windows\System32\WScript.exe
                            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\2058113e-44fb-4ad3-8986-43327165f9b5.vbs"
                            6⤵
                              PID:1100
                        • C:\Windows\System32\WScript.exe
                          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\43bb70ba-2f0e-42ad-8b1a-e83a6b809258.vbs"
                          4⤵
                            PID:1672
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:4924
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:4968
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Multimedia Platform\RuntimeBroker.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3216
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Windows\PrintDialog\fontdrvhost.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:1312
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\PrintDialog\fontdrvhost.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:4892
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Windows\PrintDialog\fontdrvhost.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:940
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 14 /tr "'C:\Program Files\7-Zip\Lang\backgroundTaskHost.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:556
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files\7-Zip\Lang\backgroundTaskHost.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:2404
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 9 /tr "'C:\Program Files\7-Zip\Lang\backgroundTaskHost.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:4564
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\upfc.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:384
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\upfc.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:1224
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Recovery\WindowsRE\upfc.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:1372
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\Font\Registry.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3848
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\Font\Registry.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3940
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 12 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\Font\Registry.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:872
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\Windows\es-ES\OfficeClickToRun.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3428
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\es-ES\OfficeClickToRun.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:1944
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 9 /tr "'C:\Windows\es-ES\OfficeClickToRun.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3108
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:2624
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:1032
                    • C:\Windows\system32\schtasks.exe
                      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\Idle.exe'" /rl HIGHEST /f
                      1⤵
                      • Process spawned unexpected child process
                      • Scheduled Task/Job: Scheduled Task
                      PID:3208

                    Network

                          MITRE ATT&CK Enterprise v15

                          Replay Monitor

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                          Downloads

                          Registry.exe

                          • Path C:\Program Files (x86)\Adobe\Acrobat Reader DC\Resource\Font\Registry.exe
                          • Size 3.6MB
                          • SHA256 88f80fbe352e5778eb8a9d0cb508c888d8a3c88c676455c5a5dc6348f7a427b1
                          • MD5 SHA1 SHA512 SSDEEP

                          RuntimeBroker.exe.log

                          • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\RuntimeBroker.exe.log
                          • Size 1KB
                          • SHA256 2a5d403a2e649d8eceef8f785eeb0f6d33888ec6bbf251b3c347e34cb32b1e77
                          • MD5 SHA1 SHA512

                          43bb70ba-2f0e-42ad-8b1a-e83a6b809258.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\43bb70ba-2f0e-42ad-8b1a-e83a6b809258.vbs
                          • Size 514B
                          • SHA256 fbe1771bd8efbf9e23dac1df854a8f23a8eeab414c608a4d67a818289a5e29cc
                          • MD5 SHA1 SHA512

                          547b7465-5087-437c-ba87-55f44b49a5cb.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\547b7465-5087-437c-ba87-55f44b49a5cb.vbs
                          • Size 738B
                          • SHA256 d47b42d0d05f09da35b60d2c371db4b41f88c5e270bcf509bd8c659e9d1a0784
                          • MD5 SHA1 SHA512

                          5812943d-5a53-4dfd-864a-929651884e35.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\5812943d-5a53-4dfd-864a-929651884e35.vbs
                          • Size 738B
                          • SHA256 cfa444075c69e02837e1d56f979a55d9c80b04eddd13d9262f895db75c3d6943
                          • MD5 SHA1 SHA512

                          5d7f481e-c94a-460a-bdf7-c08c78005660.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\5d7f481e-c94a-460a-bdf7-c08c78005660.vbs
                          • Size 738B
                          • SHA256 8bd11cb75058402d6270ea3d99b1e558138c3425484560a7672e4f822666779b
                          • MD5 SHA1 SHA512

                          a1d155ec-a6d1-402d-b038-6bccc9f4dc5f.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\a1d155ec-a6d1-402d-b038-6bccc9f4dc5f.vbs
                          • Size 738B
                          • SHA256 7617f1b3b6571e470935895cbcc60c6bd025f950b1f3f9919e168a1ef079877e
                          • MD5 SHA1 SHA512

                          bed638dd-82a8-4570-911e-01daa542e147.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\bed638dd-82a8-4570-911e-01daa542e147.vbs
                          • Size 738B
                          • SHA256 2c65b704bf37f153f2135950bb8d46854b8f2921f3978f385aac32d344361db1
                          • MD5 SHA1 SHA512

                          f5641d3a-cc8b-46da-ad01-9c87775b2f78.vbs

                          • Path C:\Users\Admin\AppData\Local\Temp\f5641d3a-cc8b-46da-ad01-9c87775b2f78.vbs
                          • Size 738B
                          • SHA256 6c399f5bc05e50cecf8be3c1b7e09a8c184cc6d4d6366ed2b7b90a0f62c5be4f
                          • MD5 SHA1 SHA512

                          pThaEkwbyi.bat

                          • Path C:\Users\Admin\AppData\Local\Temp\pThaEkwbyi.bat
                          • Size 227B
                          • SHA256 c435b7514b35c9d325326d8002a766ab5f52b3754289dfe2e44e66d7db826220
                          • MD5 SHA1 SHA512

                          memory/2116-47-0x000000001D160000-0x000000001D172000-memory.dmp

                          memory/4056-9-0x000000001B840000-0x000000001B896000-memory.dmp

                          memory/4056-12-0x000000001BE00000-0x000000001C328000-memory.dmp

                          memory/4056-17-0x000000001B960000-0x000000001B96E000-memory.dmp

                          memory/4056-16-0x000000001B950000-0x000000001B95A000-memory.dmp

                          memory/4056-19-0x000000001B980000-0x000000001B98E000-memory.dmp

                          memory/4056-18-0x000000001B970000-0x000000001B978000-memory.dmp

                          memory/4056-15-0x000000001B940000-0x000000001B948000-memory.dmp

                          memory/4056-13-0x000000001B8D0000-0x000000001B8D8000-memory.dmp

                          memory/4056-21-0x000000001B9B0000-0x000000001B9BA000-memory.dmp

                          memory/4056-22-0x000000001B9C0000-0x000000001B9CC000-memory.dmp

                          memory/4056-20-0x000000001B990000-0x000000001B998000-memory.dmp

                          memory/4056-14-0x000000001B8E0000-0x000000001B8E8000-memory.dmp

                          memory/4056-11-0x000000001B8A0000-0x000000001B8B2000-memory.dmp

                          memory/4056-43-0x00007FFA94DE0000-0x00007FFA958A1000-memory.dmp

                          memory/4056-10-0x000000001B890000-0x000000001B89C000-memory.dmp

                          memory/4056-0-0x00007FFA94DE3000-0x00007FFA94DE5000-memory.dmp

                          memory/4056-8-0x000000001B830000-0x000000001B83A000-memory.dmp

                          memory/4056-7-0x000000001B810000-0x000000001B826000-memory.dmp

                          memory/4056-6-0x00000000025D0000-0x00000000025D8000-memory.dmp

                          memory/4056-5-0x000000001B680000-0x000000001B6D0000-memory.dmp

                          memory/4056-4-0x00000000025A0000-0x00000000025BC000-memory.dmp

                          memory/4056-3-0x0000000002530000-0x000000000253E000-memory.dmp

                          memory/4056-2-0x00007FFA94DE0000-0x00007FFA958A1000-memory.dmp

                          memory/4056-1-0x0000000000010000-0x00000000003BC000-memory.dmp