Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    02/10/2026, 16:48

General

  • Target
    NursultanCrack.exe
  • Size 62KB
  • Sample261002-vbkgvszamc
  • SHA256 62f03630b7e6de136e5408a1eb7bf2c4f113be620eaf8299e7193130daba3edf
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • sheetrat

Version
  • 1.0

C2
  • skynet8.duckdns.org:25565

  • 185.167.61.79:25565

Signatures

  • Family: AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Family: Sheetrat, NonEuclid rat

    Sheetrat aka NonEuclid RAT is a trojan written in C#.

  • Async RAT payload 1 IoCs
  • Detects Sheetrat obfuscated V1.8 and higher 2 IoCs

    Sheetrat aka NonEuclid RAT is a trojan written in C#.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Downloads MZ/PE file 1 IoCs
  • Executes dropped EXE 8 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs

    Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

  • Drops file in System32 directory 7 IoCs
  • Drops file in Windows directory 7 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 4 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • Program crash 2 IoCs
  • Reads the TCP/IP host and domain name from the registry 1 TTPs 14 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 12 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\NursultanCrack.exe
    "C:\Users\Admin\AppData\Local\Temp\NursultanCrack.exe"
    1⤵
    • Downloads MZ/PE file
    • Adds Run key to start application
    • Reads the TCP/IP host and domain name from the registry
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4168
    • C:\Users\Admin\AppData\Local\Temp\stlnew.exe
      "C:\Users\Admin\AppData\Local\Temp\stlnew.exe"
      2⤵
      • Modifies WinLogon for persistence
      • Executes dropped EXE
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Reads the TCP/IP host and domain name from the registry
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4604
      • C:\Windows\SYSTEM32\CMD.exe
        "CMD" netsh advfirewall firewall add rule name="ZQb yoUFybrIy^" dir=in action=allow program="C:\Windows\System32\RuntiimeBroker.exe" enable=yes & exit
        3⤵
          PID:2872
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd" /c schtasks /create /f /sc minute /mo 1 /tn "Microsoft\Windows\WAppCrashNvTew" /tr "C:\Windows\System32\RuntiimeBroker.exe" /RL HIGHEST & exit
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:2764
          • C:\Windows\system32\schtasks.exe
            schtasks /create /f /sc minute /mo 1 /tn "Microsoft\Windows\WAppCrashNvTew" /tr "C:\Windows\System32\RuntiimeBroker.exe" /RL HIGHEST
            4⤵
            • Scheduled Task/Job: Scheduled Task
            PID:368
        • C:\Windows\SYSTEM32\cmd.exe
          "cmd" /c schtasks /create /f /sc minute /mo 30 /tn "Microsoft\MachineCore" /tr "C:\Windows\Web\IExplorer.exe" /RL HIGHEST & exit
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:4896
          • C:\Windows\system32\schtasks.exe
            schtasks /create /f /sc minute /mo 30 /tn "Microsoft\MachineCore" /tr "C:\Windows\Web\IExplorer.exe" /RL HIGHEST
            4⤵
            • Scheduled Task/Job: Scheduled Task
            PID:5216
        • C:\Windows\System32\RuntiimeBroker.exe
          "C:\Windows\System32\RuntiimeBroker.exe"
          3⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Reads the TCP/IP host and domain name from the registry
          • Suspicious use of AdjustPrivilegeToken
          PID:4780
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "NursultanCrack" /tr '"C:\Users\Admin\AppData\Roaming\NursultanCrack.exe"' & exit
        2⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3296
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /create /f /sc onlogon /rl highest /tn "NursultanCrack" /tr '"C:\Users\Admin\AppData\Roaming\NursultanCrack.exe"'
          3⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:5816
      • C:\Windows\SysWOW64\cmd.exe
        C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5395.tmp.bat""
        2⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4280
        • C:\Windows\SysWOW64\timeout.exe
          timeout 3
          3⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:4712
        • C:\Users\Admin\AppData\Roaming\NursultanCrack.exe
          "C:\Users\Admin\AppData\Roaming\NursultanCrack.exe"
          3⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:1120
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1120 -s 1004
            4⤵
            • Program crash
            PID:5040
    • C:\Users\Admin\AppData\Roaming\NursultanCrack.exe
      "C:\Users\Admin\AppData\Roaming\NursultanCrack.exe"
      1⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      PID:4492
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 4492 -s 980
        2⤵
        • Program crash
        PID:5004
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 4492 -ip 4492
      1⤵
        PID:5796
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 440 -p 1120 -ip 1120
        1⤵
          PID:5592
        • C:\Windows\System32\RuntiimeBroker.exe
          C:\Windows\System32\RuntiimeBroker.exe
          1⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Reads the TCP/IP host and domain name from the registry
          • Suspicious use of AdjustPrivilegeToken
          PID:620
        • C:\Windows\Web\IExplorer.exe
          C:\Windows\Web\IExplorer.exe
          1⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Reads the TCP/IP host and domain name from the registry
          • Suspicious use of AdjustPrivilegeToken
          PID:1504
        • C:\Windows\System32\RuntiimeBroker.exe
          "C:\Windows\System32\RuntiimeBroker.exe"
          1⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Reads the TCP/IP host and domain name from the registry
          • Suspicious use of AdjustPrivilegeToken
          PID:972
        • C:\Windows\System32\RuntiimeBroker.exe
          "C:\Windows\System32\RuntiimeBroker.exe"
          1⤵
          • Executes dropped EXE
          • Drops file in System32 directory
          • Drops file in Windows directory
          • Reads the TCP/IP host and domain name from the registry
          • Suspicious use of AdjustPrivilegeToken
          PID:4776

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

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              Downloads

              stlnew.exe

              • Path C:\Users\Admin\AppData\Local\Temp\stlnew.exe
              • Size 359KB
              • SHA256 323f65da48cbfb9c714a560a2323b5d55a7e44abe590b9f61acdf23dddbe1e4e
              • MD5 SHA1 SHA512 SSDEEP TLSH

              tmp5395.tmp.bat

              • Path C:\Users\Admin\AppData\Local\Temp\tmp5395.tmp.bat
              • Size 158B
              • SHA256 f8afd7f55e32370ba87f05a22e79570a3e14fd999f248e4b2a556d305e25841c
              • MD5 SHA1 SHA512 TLSH

              NursultanCrack.exe

              • Path C:\Users\Admin\AppData\Roaming\NursultanCrack.exe
              • Size 62KB
              • SHA256 62f03630b7e6de136e5408a1eb7bf2c4f113be620eaf8299e7193130daba3edf
              • MD5 SHA1 SHA512 SSDEEP TLSH

              memory/4168-21-0x0000000005F90000-0x000000000602C000-memory.dmp

              memory/4168-1-0x00000000006D0000-0x00000000006E6000-memory.dmp

              memory/4168-2-0x0000000074C30000-0x00000000753EC000-memory.dmp

              memory/4168-0-0x0000000074C42000-0x0000000074C43000-memory.dmp

              memory/4168-51-0x0000000074C30000-0x00000000753EC000-memory.dmp

              memory/4604-13-0x00007FFC6BF2F000-0x00007FFC6BF30000-memory.dmp

              memory/4604-17-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp

              memory/4604-16-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp

              memory/4604-15-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp

              memory/4604-14-0x0000000000F20000-0x0000000000F80000-memory.dmp

              memory/4604-57-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp

              memory/4604-58-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp

              memory/4604-67-0x00007FFC6BDA0000-0x00007FFC6C744000-memory.dmp