Analysis

  • max time kernel
    94s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-11-2024 11:05

General

  • Target

    4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe

  • Size

    1.9MB

  • MD5

    4cc23344d26c44260cb52028cff992b7

  • SHA1

    7f2b7a02ae3f65c6757f134a79c302a92e31311c

  • SHA256

    4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609

  • SHA512

    71e7ced9568ede15e9a9fe6edbd7ed77559f9046e8fc77ce83bb3fd464c61794ba719451774b2c02f30abc80a51f3563a1491a74d7f390d8152cd0b3b2928c45

  • SSDEEP

    49152:UbA30IKxSrOw6FNapB0LFyYsyqX96ZU8jMWg3:UberOGpaMYducjM3

Malware Config

Signatures

  • DcRat

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

  • Dcrat family
  • Process spawned unexpected child process 27 IoCs

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

  • UAC bypass 3 TTPs 6 IoCs
  • DCRat payload 2 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Checks whether UAC is enabled 1 TTPs 4 IoCs
  • Drops file in Program Files directory 7 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 2 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 27 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • System policy modification 1 TTPs 6 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\4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe
    "C:\Users\Admin\AppData\Local\Temp\4c6650813906ced18f7564f906ea5a033a206cb2c71f244e0d28a04e3f2d7609.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3620
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\BrowserreviewSavesruntimeperf\cyoW9TDLPAWUwl12Pv6zflv.vbe"
      2⤵
      • Checks computer location settings
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3960
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\BrowserreviewSavesruntimeperf\4COnkcqgLamz7kP5YHD7l4vjV.bat" "
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2792
        • C:\BrowserreviewSavesruntimeperf\Blockreview.exe
          "C:\BrowserreviewSavesruntimeperf\Blockreview.exe"
          4⤵
          • UAC bypass
          • Checks computer location settings
          • Executes dropped EXE
          • 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:2640
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\naD86XsDOa.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:3932
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:2004
              • C:\Recovery\WindowsRE\taskhostw.exe
                "C:\Recovery\WindowsRE\taskhostw.exe"
                6⤵
                • UAC bypass
                • Executes dropped EXE
                • Checks whether UAC is enabled
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • System policy modification
                PID:2652
          • C:\Windows\SysWOW64\reg.exe
            reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
            4⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:3512
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\BrowserreviewSavesruntimeperf\file.vbs"
        2⤵
        • System Location Discovery: System Language Discovery
        PID:2976
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Defender\es-ES\spoolsv.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2656
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\es-ES\spoolsv.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4416
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Defender\es-ES\spoolsv.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4604
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\Users\Admin\OneDrive\explorer.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:216
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\Admin\OneDrive\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4312
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "explorere" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\OneDrive\explorer.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3060
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 13 /tr "'C:\BrowserreviewSavesruntimeperf\OfficeClickToRun.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3704
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\BrowserreviewSavesruntimeperf\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2284
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 5 /tr "'C:\BrowserreviewSavesruntimeperf\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2968
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\winlogon.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:384
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1444
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4392
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Mail\sihost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2232
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2208
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Mail\sihost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1756
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4452
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4488
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4120
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "BlockreviewB" /sc MINUTE /mo 12 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\Blockreview.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1068
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Blockreview" /sc ONLOGON /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\Blockreview.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3876
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "BlockreviewB" /sc MINUTE /mo 9 /tr "'C:\Windows\BitLockerDiscoveryVolumeContents\Blockreview.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:4796
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:1976
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:756
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:508
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:2372
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Users\Public\AccountPictures\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Scheduled Task/Job: Scheduled Task
      PID:3564

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\BrowserreviewSavesruntimeperf\4COnkcqgLamz7kP5YHD7l4vjV.bat

      Filesize

      162B

      MD5

      30ca6fe561a5efd9a1f56bbb4cfd2ec0

      SHA1

      8c6d786d854487eb43f2ba5c48f739ad565b398e

      SHA256

      d749a9500abf1e22af57ef9bc10b7e30f599067dffb7152e03c67eb70a1f6e2b

      SHA512

      85ff52e77cd3e6c2e329d4b921905865484c62dcb8d53ba97d8e04972e78934648b2fe51890ff949436a2afbabbe74c4e65e1d28a51cdcb2620429c7f481018a

    • C:\BrowserreviewSavesruntimeperf\Blockreview.exe

      Filesize

      1.6MB

      MD5

      3298254972dfd7e76172f9d3a7675b27

      SHA1

      569946a908e6a9cfa0a3faa28996d886b749e4eb

      SHA256

      719c6747522525b61a364a3d62e5777c9f8715dc8654bfd082e7928e4db39188

      SHA512

      8200af5528dcc1f4b6eddb13540f03ba9d142fc6ef779c94ca1d59fbcb2ed3021638c7b6cc7f865c75c8dd3fe8ef652291b91c9044f3c6b9e57f9fad1c99271d

    • C:\BrowserreviewSavesruntimeperf\cyoW9TDLPAWUwl12Pv6zflv.vbe

      Filesize

      231B

      MD5

      01218abf206810b6e271415d154b23f4

      SHA1

      4ca645974bcd3f9baaf6dbf9073e82717494e7fe

      SHA256

      5631e2c439fe88993fc8a5ace15a447afc23c6f9412fa5e48fc78e96aa14699b

      SHA512

      caebaa06e1236fe479b49860a57e065ff70ce876b86fe254bac8912c1f1b2be5022a21c59b45148cfa2b8388c0f4f22655ebd36fb13df1221443de3bacce48d8

    • C:\BrowserreviewSavesruntimeperf\file.vbs

      Filesize

      34B

      MD5

      677cc4360477c72cb0ce00406a949c61

      SHA1

      b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

      SHA256

      f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

      SHA512

      7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

    • C:\Users\Admin\AppData\Local\Temp\naD86XsDOa.bat

      Filesize

      200B

      MD5

      54e0e28298889a01fe372cb5a7537587

      SHA1

      b71ba5b08639d1b5c412da0ba981d96bff53f6cf

      SHA256

      d12b336e6f09c8eae65cd72ca7e37b19c0ae0c61ed021bb2e1dedaa17406c6bc

      SHA512

      0551126e7639356ea37919c017bd66cdea4a655ff5d777680ad17150eb865fb045c531bd170cb7644f217ffd439d367c27c6b46b8c8dff68fe18a5b32e23361c

    • memory/2640-23-0x000000001B760000-0x000000001B76A000-memory.dmp

      Filesize

      40KB

    • memory/2640-25-0x000000001B7F0000-0x000000001B802000-memory.dmp

      Filesize

      72KB

    • memory/2640-20-0x000000001BF60000-0x000000001BFB0000-memory.dmp

      Filesize

      320KB

    • memory/2640-21-0x0000000001450000-0x0000000001458000-memory.dmp

      Filesize

      32KB

    • memory/2640-22-0x000000001B7C0000-0x000000001B7D6000-memory.dmp

      Filesize

      88KB

    • memory/2640-18-0x0000000001440000-0x000000000144E000-memory.dmp

      Filesize

      56KB

    • memory/2640-24-0x000000001B7E0000-0x000000001B7EC000-memory.dmp

      Filesize

      48KB

    • memory/2640-19-0x000000001B740000-0x000000001B75C000-memory.dmp

      Filesize

      112KB

    • memory/2640-26-0x000000001C690000-0x000000001CBB8000-memory.dmp

      Filesize

      5.2MB

    • memory/2640-27-0x000000001BF30000-0x000000001BF3C000-memory.dmp

      Filesize

      48KB

    • memory/2640-28-0x000000001BF40000-0x000000001BF48000-memory.dmp

      Filesize

      32KB

    • memory/2640-29-0x000000001BF50000-0x000000001BF5E000-memory.dmp

      Filesize

      56KB

    • memory/2640-30-0x000000001C160000-0x000000001C16E000-memory.dmp

      Filesize

      56KB

    • memory/2640-31-0x000000001C180000-0x000000001C18C000-memory.dmp

      Filesize

      48KB

    • memory/2640-17-0x0000000000AD0000-0x0000000000C70000-memory.dmp

      Filesize

      1.6MB

    • memory/2652-59-0x000000001C600000-0x000000001C612000-memory.dmp

      Filesize

      72KB