Analysis

  • max time kernel
    133s
  • max time network
    136s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/11/2024, 02:21

General

  • Target
    1b304c8a2ae4546bd7958c7f22becaf6b682a5c88b7a01945a952de991b0ef0b.exe
  • Size 2.4MB
  • Sample241103-cs71da1qds
  • SHA256 1b304c8a2ae4546bd7958c7f22becaf6b682a5c88b7a01945a952de991b0ef0b
  • MD5 SHA1 SHA512 SSDEEP

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 21 IoCs

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

  • DCRat payload 3 IoCs

    Detects payload of DCRat, commonly dropped by NSIS installers.

  • Disables Task Manager via registry modification
  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Drops file in Program Files directory 6 IoCs
  • Drops file in Windows directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

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

  • Modifies registry class 1 IoCs
  • Modifies registry key 1 TTPs 1 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 12 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 19 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\1b304c8a2ae4546bd7958c7f22becaf6b682a5c88b7a01945a952de991b0ef0b.exe
    "C:\Users\Admin\AppData\Local\Temp\1b304c8a2ae4546bd7958c7f22becaf6b682a5c88b7a01945a952de991b0ef0b.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:648
    • C:\Users\Admin\AppData\Local\Temp\RayCheats.exe
      "C:\Users\Admin\AppData\Local\Temp\RayCheats.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:3812
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Nursultan\CXMe2.vbe"
        3⤵
        • Checks computer location settings
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1504
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\Nursultan\zvsDOSOzYWKFo4ZM.bat" "
          4⤵
          • System Location Discovery: System Language Discovery
          • Suspicious use of WriteProcessMemory
          PID:4376
          • C:\Users\Admin\AppData\Roaming\Nursultan\comSession.exe
            "C:\Users\Admin\AppData\Roaming\Nursultan\comSession.exe"
            5⤵
            • Checks computer location settings
            • Executes dropped EXE
            • Drops file in Program Files directory
            • Drops file in Windows directory
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1280
            • C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\csrss.exe
              "C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\csrss.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:2732
          • C:\Windows\SysWOW64\reg.exe
            reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Modifies registry key
            PID:1140
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Nursultan\file.vbs"
        3⤵
        • System Location Discovery: System Language Discovery
        PID:1976
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\csrss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2748
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3264
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\csrss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1936
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 5 /tr "'C:\Windows\assembly\GAC_32\System.EnterpriseServices\spoolsv.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1664
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\assembly\GAC_32\System.EnterpriseServices\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4600
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 9 /tr "'C:\Windows\assembly\GAC_32\System.EnterpriseServices\spoolsv.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:5000
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2564
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4176
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "SppExtComObjS" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4016
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 5 /tr "'C:\Windows\Containers\serviced\sysmon.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4844
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Windows\Containers\serviced\sysmon.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4356
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 6 /tr "'C:\Windows\Containers\serviced\sysmon.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1832
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Mail\fontdrvhost.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2808
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4060
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Mail\fontdrvhost.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:4284
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 11 /tr "'C:\Program Files\Google\Chrome\Application\WmiPrvSE.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2928
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\Application\WmiPrvSE.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3316
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 13 /tr "'C:\Program Files\Google\Chrome\Application\WmiPrvSE.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1956
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 6 /tr "'C:\Program Files\Google\Chrome\smss.exe'" /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:3288
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files\Google\Chrome\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:2676
  • C:\Windows\system32\schtasks.exe
    schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\Program Files\Google\Chrome\smss.exe'" /rl HIGHEST /f
    1⤵
    • Process spawned unexpected child process
    • Scheduled Task/Job: Scheduled Task
    PID:1544

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        RayCheats.exe

        • Path C:\Users\Admin\AppData\Local\Temp\RayCheats.exe
        • Size 2.7MB
        • SHA256 c3babdee670d6cf922cb746a997f5ee112a11a141584c0eb703d192fc1fcee64
        • MD5 SHA1 SHA512 SSDEEP

        CXMe2.vbe

        • Path C:\Users\Admin\AppData\Roaming\Nursultan\CXMe2.vbe
        • Size 209B
        • SHA256 7a11a2afd7914cc6d77553b3d44af9a3bbd65551af2a551138fb27ecb066d442
        • MD5 SHA1 SHA512

        comSession.exe

        • Path C:\Users\Admin\AppData\Roaming\Nursultan\comSession.exe
        • Size 2.4MB
        • SHA256 84c35170f401c1b809aaa7888f79fe11860798fe3a82328383840e1d133f9d2e
        • MD5 SHA1 SHA512 SSDEEP

        file.vbs

        • Path C:\Users\Admin\AppData\Roaming\Nursultan\file.vbs
        • Size 34B
        • SHA256 f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b
        • MD5 SHA1 SHA512

        zvsDOSOzYWKFo4ZM.bat

        • Path C:\Users\Admin\AppData\Roaming\Nursultan\zvsDOSOzYWKFo4ZM.bat
        • Size 148B
        • SHA256 0e9a479bd000929602b921f116255053d01c3908837dcaae884765f48bb243b6
        • MD5 SHA1 SHA512

        memory/1280-29-0x000000001BE60000-0x000000001BEB0000-memory.dmp

        memory/1280-27-0x0000000001460000-0x000000000146E000-memory.dmp

        memory/1280-28-0x0000000002E40000-0x0000000002E5C000-memory.dmp

        memory/1280-26-0x0000000000A20000-0x0000000000C82000-memory.dmp

        memory/1280-30-0x000000001B890000-0x000000001B8A6000-memory.dmp

        memory/1280-31-0x000000001BE10000-0x000000001BE66000-memory.dmp

        memory/1280-32-0x0000000001470000-0x0000000001482000-memory.dmp

        memory/1280-33-0x000000001C760000-0x000000001CC88000-memory.dmp

        memory/1280-34-0x000000001B8B0000-0x000000001B8BE000-memory.dmp

        memory/1280-36-0x000000001BEE0000-0x000000001BEE8000-memory.dmp

        memory/1280-35-0x000000001BED0000-0x000000001BED8000-memory.dmp

        memory/2732-62-0x000000001CFA0000-0x000000001CFF6000-memory.dmp

        memory/2732-63-0x000000001CF20000-0x000000001CF32000-memory.dmp