Analysis

  • max time kernel
    148s
  • max time network
    143s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260629-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260629-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    03/07/2026, 19:04

General

  • Target
    file.exe
  • Size 6.1MB
  • Sample260703-xq5sfsey21
  • SHA256 f3e1e3c4397686ae17308f1f5376a76eaacfe018b834a7d3f5512739be7d19b3
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Executes dropped EXE 2 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.

  • Subvert Trust Controls: Mark-of-the-Web Bypass 1 TTPs 1 IoCs

    When files are downloaded from the Internet, they are tagged with a hidden NTFS Alternate Data Stream (ADS) named Zone.Identifier with a specific value known as the MOTW.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies trusted root certificate store through registry 1 TTPs 2 IoCs

    A root certificate was added, modified, or removed in the trusted certificate store registry paths.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies registry class 3 IoCs
  • Modifies system certificate store 2 TTPs 4 IoCs
  • NTFS ADS 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 16 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 64 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Subvert Trust Controls: Mark-of-the-Web Bypass
    • Modifies trusted root certificate store through registry
    • Checks processor information in registry
    • Modifies system certificate store
    • NTFS ADS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5732
    • C:\Users\Admin\AppData\Local\Temp\file.exe
      "C:\Users\Admin\AppData\Local\Temp\file.exe" smartscreen-auto
      2⤵
      • Suspicious use of SetWindowsHookEx
      PID:2756
    • C:\Windows\explorer.exe
      "C:\Windows\explorer.exe" "C:\ProgramData\WinMgmtHelper\cache\testcalc.exe"
      2⤵
        PID:2808
      • C:\ProgramData\WinMgmtHelper\cache\testcalc.exe
        "C:\ProgramData\WinMgmtHelper\cache\testcalc.exe"
        2⤵
        • Executes dropped EXE
        • Modifies registry class
        • Suspicious use of WriteProcessMemory
        PID:7040
        • C:\Windows\System32\win32calc.exe
          "C:\Windows\System32\win32calc.exe"
          3⤵
            PID:6364
      • C:\Windows\explorer.exe
        C:\Windows\explorer.exe /factory,{75dff2b7-6936-4c06-a8bb-676a7b00b24b} -Embedding
        1⤵
        • Modifies registry class
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1308
        • C:\ProgramData\WinMgmtHelper\cache\testcalc.exe
          "C:\ProgramData\WinMgmtHelper\cache\testcalc.exe"
          2⤵
          • Executes dropped EXE
          • Modifies registry class
          • Suspicious use of WriteProcessMemory
          PID:3668
          • C:\Windows\System32\win32calc.exe
            "C:\Windows\System32\win32calc.exe"
            3⤵
            • Suspicious use of SetWindowsHookEx
            PID:5488

      Network

            MITRE ATT&CK Enterprise v16

            Replay Monitor

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            Downloads

            testcalc.exe

            • Path C:\ProgramData\WinMgmtHelper\cache\testcalc.exe
            • Size 54KB
            • SHA256 fe252e74a62c18c941fb922d1c6975127410a821f8436498781846a7c12153d5
            • MD5 SHA1 SHA512 SSDEEP TLSH