Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    21/07/2026, 16:49

General

  • Target
    vac4.65/setup64.exe
  • Size 136KB
  • Sample260721-vb6ebser31
  • SHA256 d9ff7eb0f7536c199e9e6bccd5da2b7dd52e4894b03d22257518faf224b174b1
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
8/10

Malware Config

Signatures

  • Drops file in Drivers directory 6 IoCs
  • Drops file in System32 directory 18 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Drops file in Program Files directory 14 IoCs
  • Drops file in Windows directory 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 32 IoCs

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

  • Modifies data under HKEY_USERS 41 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 13 IoCs
  • Suspicious use of WriteProcessMemory 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\vac4.65\setup64.exe
    "C:\Users\Admin\AppData\Local\Temp\vac4.65\setup64.exe"
    1⤵
    • Drops file in Drivers directory
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Checks SCSI registry key(s)
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2604
    • C:\Windows\System32\control.exe
      "C:\Windows\System32\control.exe" mmsys.cpl
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1512
      • C:\Windows\system32\rundll32.exe
        "C:\Windows\system32\rundll32.exe" Shell32.dll,Control_RunDLL mmsys.cpl
        3⤵
        • Suspicious behavior: GetForegroundWindowSpam
        PID:5804
  • C:\Windows\system32\DrvInst.exe
    DrvInst.exe "4" "0" "C:\Users\Admin\AppData\Local\Temp\{c1d3773b-f96c-c94a-bb86-e30c75bf6e42}\vrtaucbl.inf" "9" "4646d1453" "0000000000000190" "WinSta0\Default" "0000000000000164" "208" "c:\users\admin\appdata\local\temp\vac4.65"
    1⤵
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Checks SCSI registry key(s)
    • Modifies data under HKEY_USERS
    PID:4316
  • C:\Windows\system32\DrvInst.exe
    DrvInst.exe "2" "11" "ROOT\{83ED7F0E-2028-4956-B0B4-39C76FDAEF1D}\0000" "C:\Windows\System32\DriverStore\FileRepository\vrtaucbl.inf_amd64_7dc9aa85a9f9ca87\vrtaucbl.inf" "oem1.inf:a52522ad0c48fa1f:DevInst:4.65.0.11535:virtualaudiocable_83ed7f0e-2028-4956-b0b4-39c76fdaef1d," "4646d1453" "0000000000000190" "324b"
    1⤵
    • Drops file in Drivers directory
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:5540

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        setup64.exe

        • Path C:\Program Files\Virtual Audio Cable\setup64.exe
        • Size 136KB
        • SHA256 d9ff7eb0f7536c199e9e6bccd5da2b7dd52e4894b03d22257518faf224b174b1
        • MD5 SHA1 SHA512 SSDEEP TLSH

        uninst.ini

        • Path C:\Program Files\Virtual Audio Cable\uninst.ini
        • Size 4KB
        • SHA256 85ee480862249d983941c46dd9daa69bbb10ac1147af61fce05150d8823fdabd
        • MD5 SHA1 SHA512 SSDEEP TLSH

        vrtaucbl.inf_amd64_7dc9aa85a9f9ca87.ini

        • Path C:\Windows\System32\DriverStore\FileRepository\vrtaucbl.inf_amd64_7dc9aa85a9f9ca87.ini
        • Size 425B
        • SHA256 82b53b47aa2b3268df4aac24fc3873faa3437dd76f97327fa248fe9341f28088
        • MD5 SHA1 SHA512 TLSH

        vrtaucbl.sys

        • Path C:\Windows\System32\drivers\vrtaucbl.sys
        • Size 219KB
        • SHA256 d3b8219f346289cbe0bc09a7705e68c362e7523b4cc49f2e77ee91d3a5d10c7f
        • MD5 SHA1 SHA512 SSDEEP TLSH