Analysis

  • max time kernel
    149s
  • max time network
    151s
  • 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, 15:40

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

    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.

  • 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
  • Reads user/profile data of web browsers 2 TTPs

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

  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in System32 directory 11 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 21 IoCs

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

  • Modifies registry class 3 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 17 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⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:2624
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\portagentbrowserweb\WRLLAAz5wgYRSh1EMNi6f5aM.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:3816
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\portagentbrowserweb\6X9rFgrS3wv5iM7PLkmLFP1j.bat" "
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3788
        • C:\portagentbrowserweb\Containerruntime.exe
          "C:\portagentbrowserweb\Containerruntime.exe"
          4⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3744
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\jX7Z9tGZw9.bat"
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:4176
            • C:\Windows\system32\w32tm.exe
              w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
              6⤵
                PID:1748
              • C:\Users\Default\dllhost.exe
                "C:\Users\Default\dllhost.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of AdjustPrivilegeToken
                PID:1224
          • 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:376
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Users\Default\Documents\My Videos\System.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1648
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Users\Default\Documents\My Videos\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2476
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 9 /tr "'C:\Users\Default\Documents\My Videos\System.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 6 /tr "'C:\Users\Public\backgroundTaskHost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3596
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Users\Public\backgroundTaskHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1256
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 12 /tr "'C:\Users\Public\backgroundTaskHost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4144
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\services.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4212
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:872
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "servicess" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1960
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2876
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2892
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\RuntimeBroker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3456
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 14 /tr "'C:\portagentbrowserweb\sysmon.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4448
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\portagentbrowserweb\sysmon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3812
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 13 /tr "'C:\portagentbrowserweb\sysmon.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4480
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 7 /tr "'C:\Users\Default\dllhost.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3976
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:564
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Users\Default\dllhost.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:4456
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MoUsoCoreWorkerM" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\Searches\MoUsoCoreWorker.exe'" /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:2548
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MoUsoCoreWorker" /sc ONLOGON /tr "'C:\Users\Admin\Searches\MoUsoCoreWorker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:3504
    • C:\Windows\system32\schtasks.exe
      schtasks.exe /create /tn "MoUsoCoreWorkerM" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\Searches\MoUsoCoreWorker.exe'" /rl HIGHEST /f
      1⤵
      • Process spawned unexpected child process
      • Creates scheduled task(s)
      PID:1052
    • C:\Windows\system32\mspaint.exe
      "C:\Windows\system32\mspaint.exe" "C:\Users\Admin\Desktop\ResolveWatch.png" /ForceBootstrapPaint3D
      1⤵
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:656
    • C:\Windows\System32\svchost.exe
      C:\Windows\System32\svchost.exe -k LocalSystemNetworkRestricted -p -s DsSvc
      1⤵
      • Drops file in System32 directory
      PID:4732
    • C:\Windows\system32\OpenWith.exe
      C:\Windows\system32\OpenWith.exe -Embedding
      1⤵
      • Suspicious use of SetWindowsHookEx
      PID:4244

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\jX7Z9tGZw9.bat

            Filesize

            193B

            MD5

            59d3ce836ba3588fb42c99d5a49b2b07

            SHA1

            454237bd19b410431caac644afb16666c5b69689

            SHA256

            fb3bdac414eef78aefe0a066538b446de08f552ef856bdaf85e7078d1d98830b

            SHA512

            ea947d8a05b7172906df913749c1d7549eea596c81bd6fadbdc2ac3c67f895f4ae8146e3149f20fef841d3ce620b02fadcd0ed1b429545a6d82bad97555bdbac

          • 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/3744-16-0x000000001B990000-0x000000001B9A6000-memory.dmp

            Filesize

            88KB

          • memory/3744-14-0x0000000001740000-0x000000000175C000-memory.dmp

            Filesize

            112KB

          • memory/3744-15-0x000000001C160000-0x000000001C1B0000-memory.dmp

            Filesize

            320KB

          • memory/3744-17-0x0000000002F60000-0x0000000002F6C000-memory.dmp

            Filesize

            48KB

          • memory/3744-13-0x0000000000D30000-0x0000000000E62000-memory.dmp

            Filesize

            1.2MB

          • memory/3744-12-0x00007FFA4AD83000-0x00007FFA4AD85000-memory.dmp

            Filesize

            8KB

          • memory/4732-94-0x000001FC067C0000-0x000001FC067D0000-memory.dmp

            Filesize

            64KB

          • memory/4732-98-0x000001FC07230000-0x000001FC07240000-memory.dmp

            Filesize

            64KB

          • memory/4732-105-0x000001FC0F350000-0x000001FC0F351000-memory.dmp

            Filesize

            4KB

          • memory/4732-107-0x000001FC0F3D0000-0x000001FC0F3D1000-memory.dmp

            Filesize

            4KB

          • memory/4732-109-0x000001FC0F3D0000-0x000001FC0F3D1000-memory.dmp

            Filesize

            4KB

          • memory/4732-110-0x000001FC0F460000-0x000001FC0F461000-memory.dmp

            Filesize

            4KB

          • memory/4732-111-0x000001FC0F460000-0x000001FC0F461000-memory.dmp

            Filesize

            4KB

          • memory/4732-112-0x000001FC0F470000-0x000001FC0F471000-memory.dmp

            Filesize

            4KB

          • memory/4732-113-0x000001FC0F470000-0x000001FC0F471000-memory.dmp

            Filesize

            4KB