Analysis

  • max time kernel
    133s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-05-2024 15:39

General

  • Target

    nursultan nexgen fix.exe

  • Size

    1.5MB

  • MD5

    a3d07c747770c9a471a44446e46e33d5

  • SHA1

    8340534fb1770bae9660287ddb0496e243efcfe4

  • SHA256

    16015088c3352a8257f420555e7ce6245aa0e6682deeca79bf7e08c24e1ac3de

  • SHA512

    307cbdddaa9f426f8ceec060c2c0b1ab5ed3573e327dbcfdda7b1dfd22cf17559f017d835d71bdd15397fa95b0c7dfbfb4cd6b51cd5b2adc1d1cddc8ffe27f99

  • SSDEEP

    24576:U2G/nvxW3Ww0tpfnNGcvUCxt9groiK5Cg3ZRvm43TzvmF2cK07:UbA30pfnLRRgrheJROuTzvIR

Malware Config

Signatures

  • DcRat 27 IoCs

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

  • Process spawned unexpected child process 24 IoCs

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

  • 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 4 IoCs

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

  • Executes dropped EXE 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Drops file in Program Files directory 14 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 24 IoCs

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

  • Modifies registry class 2 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 21 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 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\nursultan nexgen fix.exe
    "C:\Users\Admin\AppData\Local\Temp\nursultan nexgen fix.exe"
    1⤵
    • DcRat
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:3204
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:3468
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1336
        • C:\portagentbrowserweb\Containerruntime.exe
          "C:\portagentbrowserweb\Containerruntime.exe"
          4⤵
          • DcRat
          • 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:2628
          • C:\portagentbrowserweb\Containerruntime.exe
            "C:\portagentbrowserweb\Containerruntime.exe"
            5⤵
            • Checks computer location settings
            • Executes dropped EXE
            • 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
            PID:2860
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\hGc94hG8VN.bat"
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:2384
              • C:\Windows\system32\w32tm.exe
                w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
                7⤵
                  PID:4720
                • C:\Program Files\Microsoft Office 15\RuntimeBroker.exe
                  "C:\Program Files\Microsoft Office 15\RuntimeBroker.exe"
                  7⤵
                  • Executes dropped EXE
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious behavior: GetForegroundWindowSpam
                  • Suspicious use of AdjustPrivilegeToken
                  PID:3460
          • C:\Windows\SysWOW64\reg.exe
            reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
            4⤵
            • Modifies registry key
            PID:4448
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 7 /tr "'C:\Program Files\Microsoft Office\Office16\winlogon.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:884
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office\Office16\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2288
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Program Files\Microsoft Office\Office16\winlogon.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1940
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\fontdrvhost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3340
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4972
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Adobe\Acrobat Reader DC\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2848
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\portagentbrowserweb\fontdrvhost.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1928
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\portagentbrowserweb\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2836
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 11 /tr "'C:\portagentbrowserweb\fontdrvhost.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3464
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Microsoft.NET\Idle.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1832
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4636
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft.NET\Idle.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4684
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files\Microsoft Office 15\RuntimeBroker.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2196
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3960
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Program Files\Microsoft Office 15\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3696
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Mail\csrss.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1184
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Mail\csrss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1364
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files\Windows Mail\csrss.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4364
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4768
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2584
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:624
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Mail\upfc.exe'" /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:692
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\upfc.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3936
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Mail\upfc.exe'" /rl HIGHEST /f
      1⤵
      • DcRat
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4240

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Containerruntime.exe.log
      Filesize

      1KB

      MD5

      7800fca2323a4130444c572374a030f4

      SHA1

      40c9b8e0e5e7d72a5293f4010f2ccf21e637b4aa

      SHA256

      29f5645ac14353ac460858f52c856548f3aeb144b09eef672a6b4849bafe742e

      SHA512

      c8a7ad930b8c07007c7a67d8c32a2a4a401dcc34ab966e0e80901655fcbe1f5c95b72a195e6381b1de56c2c987eeab093d8e89891bec9e9684785c5d824b3554

    • C:\Users\Admin\AppData\Local\Temp\hGc94hG8VN.bat
      Filesize

      219B

      MD5

      26ef455222b6d27da34af489d33b4f17

      SHA1

      35602777a4ff965fc258c359956a96a143494a7d

      SHA256

      4650083f0ceb948d7a8d6e9f53dd3679535e243bc0684e08d601d2ec193b4d63

      SHA512

      13cdd22701637012d6a5ea2e87a45a7456172561a3f508feda363947a62649966367b9f7c8b157d79c2a5d7cc63f35186a580c68ee03b446eca9945a0a388868

    • C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat
      Filesize

      157B

      MD5

      c8f8a078dace2ff4cb106803c9199643

      SHA1

      a5029ff4c4f0f24b0fbe2951c9a8002501ebd3b5

      SHA256

      1b99d39fa273f33b072c67e0df7d33b1699fa17b7c7139467a658302a5ed0e0d

      SHA512

      efaea3b4653768bbd135a0ec55319df2464f1d440ad982f31a5eff05c5ba5032f4718683ff6419c668bf1f34a117b5a101f56d1efc1d74ad93e692c52686f999

    • C:\portagentbrowserweb\Containerruntime.exe
      Filesize

      1.2MB

      MD5

      5887a563351ca99247b7e2c448bd9f2e

      SHA1

      b24695e88143863297535989900bb7521ea86d67

      SHA256

      e74cbd74c838db604926e27322342c02f803b95f98680d4089b5c01ed93fb390

      SHA512

      b7d82bd09ba64891b75bbb9356de74a1ed0835709a391698c1301825777418f57e4f2ae3c260d3f7b6ada05d0e7ddeb4a6b75901fdf53bdd82ffa2febb685107

    • C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe
      Filesize

      220B

      MD5

      61a07f2f9e8e9b1f5175b2d60c3e3f18

      SHA1

      e695b0c2b43c786453bf3f6ae504f0626951d281

      SHA256

      5c75708ec9e4fe419a2fd1067bd5793bacb28140177cc6b36300fbf28e7c23d1

      SHA512

      8ef3529f6bf504224e7803019f1e162aead7961bc1a5115f50fb5f580570e8b04707da21a7aab4eb7f1554a3b5333597fb3335e5f6a74dabfdb0583eecb35b5d

    • memory/2628-12-0x00007FF96CD73000-0x00007FF96CD75000-memory.dmp
      Filesize

      8KB

    • memory/2628-13-0x0000000000190000-0x00000000002C2000-memory.dmp
      Filesize

      1.2MB

    • memory/2628-14-0x000000001ADE0000-0x000000001ADFC000-memory.dmp
      Filesize

      112KB

    • memory/2628-15-0x000000001B5C0000-0x000000001B610000-memory.dmp
      Filesize

      320KB

    • memory/2628-17-0x000000001AD80000-0x000000001AD8C000-memory.dmp
      Filesize

      48KB

    • memory/2628-16-0x000000001AE00000-0x000000001AE16000-memory.dmp
      Filesize

      88KB