Analysis

  • max time kernel
    92s
  • max time network
    128s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    05/09/2026, 19:34

Errors

Reason
Machine shutdown

General

  • Target
    XWormClient.exe
  • Size 32KB
  • Sample260905-yacbmsff49
  • SHA256 cf14244fb788ca119fbc290c434897e7e928cd8b7bec19e501b92f8cabde38ae
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • xworm

Version
  • 5.0

C2
  • 89.190.158.167:911

Mutex
  • x90mfbG7q12JM7dT

Attributes
  • install_file

    USB.exe

aes.plain

Signatures

  • Family: Xworm

    Xworm is a remote access trojan written in C#.

  • Detect Xworm Payload 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in System32 directory 18 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 5 IoCs

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

  • Checks processor information in registry 2 TTPs 28 IoCs

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

  • Enumerates system info in registry 2 TTPs 64 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\XWormClient.exe
    "C:\Users\Admin\AppData\Local\Temp\XWormClient.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4616
    • C:\Users\Admin\AppData\Local\Temp\zrxtxc.exe
      "C:\Users\Admin\AppData\Local\Temp\zrxtxc.exe"
      2⤵
      • Executes dropped EXE
      • Writes to the Master Boot Record (MBR)
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1888
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c reg delete HKCR /f
        3⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:4160
        • C:\Windows\system32\reg.exe
          reg delete HKCR /f
          4⤵
            PID:3432
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c reg delete HKCU /f
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:4004
          • C:\Windows\system32\reg.exe
            reg delete HKCU /f
            4⤵
            • Modifies registry key
            PID:2444
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c reg delete HKLM /f
          3⤵
          • Executes a command shell one-liner
          • Suspicious use of WriteProcessMemory
          PID:2668
          • C:\Windows\system32\reg.exe
            reg delete HKLM /f
            4⤵
            • Checks processor information in registry
            • Enumerates system info in registry
            • Modifies registry key
            PID:3768
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c reg delete HKU /f
          3⤵
          • Executes a command shell one-liner
          PID:1316
          • C:\Windows\system32\reg.exe
            reg delete HKU /f
            4⤵
              PID:4504
          • C:\Windows\System32\cmd.exe
            "C:\Windows\System32\cmd.exe" /c reg delete HKCC /f
            3⤵
            • Executes a command shell one-liner
            PID:4908
            • C:\Windows\system32\reg.exe
              reg delete HKCC /f
              4⤵
                PID:4436
        • C:\Windows\system32\AUDIODG.EXE
          C:\Windows\system32\AUDIODG.EXE 0x00000000000004E0 0x00000000000004E8
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:4404

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              zrxtxc.exe

              • Path C:\Users\Admin\AppData\Local\Temp\zrxtxc.exe
              • Size 11KB
              • SHA256 1a7610cd29d915c7f4ad68d5238e4dd3cfc973de57ad81a177ba8ae5cb9a86c5
              • MD5 SHA1 SHA512 SSDEEP TLSH

              memory/1888-15-0x0000000000E50000-0x0000000000E5A000-memory.dmp

              memory/1888-16-0x000000001D190000-0x000000001D1A0000-memory.dmp

              memory/1888-20-0x000000001D190000-0x000000001D1A0000-memory.dmp

              memory/4616-0-0x0000000000380000-0x000000000038E000-memory.dmp

              memory/4616-1-0x000000001C850000-0x000000001C860000-memory.dmp

              memory/4616-2-0x000000001C850000-0x000000001C860000-memory.dmp

              memory/4616-3-0x000000001DB50000-0x000000001DCE6000-memory.dmp