Analysis

  • max time kernel
    900s
  • max time network
    717s
  • platform
    windows11-21h2_x64
  • resource
    win11-20250610-en
  • resource tags

    arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    07/10/2025, 19:41

General

  • Target
    Welrast_64.exe
  • Size 2.7MB
  • Sample251007-yd535askz3
  • SHA256 123423017a860591694b92eaf14eb3b633d80899c00b0d34d525469e79e6c340
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Executes dropped EXE 5 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

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

  • Checks processor information in registry 2 TTPs 4 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Windows\Explorer.EXE
    C:\Windows\Explorer.EXE
    1⤵
    • Adds Run key to start application
    • Checks processor information in registry
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3324
    • C:\Users\Admin\AppData\Local\Temp\Welrast_64.exe
      "C:\Users\Admin\AppData\Local\Temp\Welrast_64.exe"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:5920
      • C:\Users\Admin\AppData\Roaming\fdfbvd.exe
        "C:\Users\Admin\AppData\Roaming\fdfbvd.exe" -s -ptdgndgmsratgg4hfsghsrfH
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2860
        • C:\Users\Admin\AppData\Roaming\advasv.exe
          "C:\Users\Admin\AppData\Roaming\advasv.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Checks processor information in registry
          PID:3408
        • C:\Users\Admin\AppData\Roaming\dascsaCV.exe
          "C:\Users\Admin\AppData\Roaming\dascsaCV.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2912
        • C:\Users\Admin\AppData\Roaming\dzvsac.exe
          "C:\Users\Admin\AppData\Roaming\dzvsac.exe"
          4⤵
          • Executes dropped EXE
          • System Location Discovery: System Language Discovery
          PID:3824
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c C:\ProgramData\TimeManager.exe
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5060
      • C:\ProgramData\TimeManager.exe
        C:\ProgramData\TimeManager.exe
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        PID:2352

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        TimeManager.exe

        • Path C:\ProgramData\TimeManager.exe
        • Size 240KB
        • SHA256 9b7649f38281623b6bad16b3687f2865b972c6a99608f7adcd742a6260cab334
        • MD5 SHA1 SHA512 SSDEEP

        advasv.exe

        • Path C:\Users\Admin\AppData\Roaming\advasv.exe
        • Size 48KB
        • SHA256 f02f97d5e28ba69e50ab74318890d6657382fc982ce2c77a4ef326bb20495aaf
        • MD5 SHA1 SHA512 SSDEEP

        dascsaCV.exe

        • Path C:\Users\Admin\AppData\Roaming\dascsaCV.exe
        • Size 240KB
        • SHA256 e56fa8a40c953d96e66273be75ac51a8213c3057233b199b18d13dbd5f0fb7c1
        • MD5 SHA1 SHA512 SSDEEP

        dzvsac.exe

        • Path C:\Users\Admin\AppData\Roaming\dzvsac.exe
        • Size 6.4MB
        • SHA256 0558952b7f3be72afaa7bddd8d94d432e1dcf0a690f336083e3801bc268b9866
        • MD5 SHA1 SHA512 SSDEEP

        fdfbvd.exe

        • Path C:\Users\Admin\AppData\Roaming\fdfbvd.exe
        • Size 2.8MB
        • SHA256 a533c1f2705efed579475faad2fd72eb3d40ce5ff653ff1588accf3fa450fcf2
        • MD5 SHA1 SHA512 SSDEEP

        memory/2912-32-0x0000000000400000-0x0000000000434000-memory.dmp

        memory/2912-31-0x0000000000490000-0x0000000000491000-memory.dmp

        memory/3324-51-0x0000000002E50000-0x0000000002E51000-memory.dmp

        memory/3324-45-0x0000000002E20000-0x0000000002E3A000-memory.dmp

        memory/3324-30-0x0000000002E20000-0x0000000002E3A000-memory.dmp

        memory/3324-58-0x0000000002E20000-0x0000000002E3A000-memory.dmp

        memory/3324-59-0x0000000002E20000-0x0000000002E3A000-memory.dmp

        memory/3324-57-0x0000000002E20000-0x0000000002E3A000-memory.dmp

        memory/3408-61-0x0000000000400000-0x0000000000411000-memory.dmp

        memory/3408-62-0x0000000000400000-0x0000000000411000-memory.dmp

        memory/3408-96-0x0000000000400000-0x0000000000411000-memory.dmp