Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/03/2024, 13:54

General

  • Target

    DZKJ.exe

  • Size

    14.8MB

  • MD5

    7d94503119588f1e769d1a871a949969

  • SHA1

    d31a2fcb9fa635b7ca9cda8b6a239815a6645dcd

  • SHA256

    dcb378e8645acb7a8c2be0f51f9c9c125044659a73390d524accb96772f79a16

  • SHA512

    cc1b52450d9623d6766320cc80346fe6e8e00f669b2a3f7fd8ab95e5c610803d66457e886e62dff371421982dd21c259159eb5a0907c94562f018e816e3dd95f

  • SSDEEP

    196608:WgA3UoPtKLBSIkMmf5XPmImn/2gpi08QukGZl9lEL38NlxgjewYk1jrMX+5j6txW:pAkolIBShMwu+2ukmoKlxgjewXmxB35m

Malware Config

Signatures

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Loads dropped DLL 2 IoCs
  • Themida packer 7 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Checks whether UAC is enabled 1 TTPs 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.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Checks processor information in registry 2 TTPs 4 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 8 IoCs
  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\DZKJ.exe
    "C:\Users\Admin\AppData\Local\Temp\DZKJ.exe"
    1⤵
    • Identifies VirtualBox via ACPI registry values (likely anti-VM)
    • Checks BIOS information in registry
    • Loads dropped DLL
    • Checks whether UAC is enabled
    • Writes to the Master Boot Record (MBR)
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Checks processor information in registry
    • Enumerates system info in registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4396
    • C:\Windows\SysWOW64\regsvr32.exe
      regsvr32 C:\Users\Admin\AppData\Local\Temp\DZPdf.dll /s
      2⤵
      • Loads dropped DLL
      • Modifies registry class
      PID:3920
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4396 -s 2480
      2⤵
      • Program crash
      PID:5108
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4396 -ip 4396
    1⤵
      PID:1584

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\DZPdf.dll

      Filesize

      9.9MB

      MD5

      35d66db087de03b967ad8d62fa22dbb9

      SHA1

      e9cd8518fa44253bb1e3582ef0323228932e3bb6

      SHA256

      a42a1b5caf838b3d211c5e4c3aef41aa4b60d0a9394264810a0768f60c330e2c

      SHA512

      3a793be20fe5f6fe8763af18bce1120c4bad63c8e6110120d92e18852d86490d58ee03dd11acc3f2f8eb15911fbbcb93edc6c7d244a4f0dafb45782591f64484

    • memory/4396-10-0x0000000075EE0000-0x0000000075FD0000-memory.dmp

      Filesize

      960KB

    • memory/4396-13-0x0000000005B80000-0x0000000005BAB000-memory.dmp

      Filesize

      172KB

    • memory/4396-3-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-0-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-5-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-6-0x0000000005B80000-0x0000000005BAB000-memory.dmp

      Filesize

      172KB

    • memory/4396-8-0x0000000077065000-0x0000000077066000-memory.dmp

      Filesize

      4KB

    • memory/4396-9-0x0000000075EE0000-0x0000000075FD0000-memory.dmp

      Filesize

      960KB

    • memory/4396-2-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-11-0x0000000077062000-0x0000000077063000-memory.dmp

      Filesize

      4KB

    • memory/4396-4-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-12-0x0000000077063000-0x0000000077064000-memory.dmp

      Filesize

      4KB

    • memory/4396-15-0x000000007707B000-0x000000007707C000-memory.dmp

      Filesize

      4KB

    • memory/4396-16-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-21-0x0000000077047000-0x0000000077048000-memory.dmp

      Filesize

      4KB

    • memory/4396-1-0x0000000077094000-0x0000000077096000-memory.dmp

      Filesize

      8KB

    • memory/4396-30-0x0000000000400000-0x0000000001906000-memory.dmp

      Filesize

      21.0MB

    • memory/4396-31-0x0000000075EE0000-0x0000000075FD0000-memory.dmp

      Filesize

      960KB

    • memory/4396-32-0x0000000005B80000-0x0000000005BAB000-memory.dmp

      Filesize

      172KB