Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2024 09:16

General

  • Target

    file.exe

  • Size

    407KB

  • MD5

    8f36720e87f9d5f3515afbe099b0e457

  • SHA1

    e404cf4fb5ad9d9bff8bd5c8d343a60df27161d8

  • SHA256

    7d740bcc6e1ebdf1ec1a25242db7ab2aabbfa568394f0775287e28f69d526877

  • SHA512

    05e46480bf2a4e788b21a5209e9400eb73656b8bb6d716af981f36fd05a7c6142c4cfdefa9dee01098c7b2621e6ccf63c331a2ad27fcf9bcea1f45faeb133a25

  • SSDEEP

    6144:+EotgE1A4rFmd7Ta1SkmkwMZCKmLuKtuMfDFrbWWxhg8ZkriwCEvMzZwb0LlmwrW:+fNUd7Ta1DTn+ttfdpbZwGCb0QMqES

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://t.me/ta904ek

https://steamcommunity.com/profiles/76561199695752269

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:128.0) Gecko/20100101 Firefox/128.0

Signatures

  • Detect Vidar Stealer 11 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

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

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

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

  • Checks processor information in registry 2 TTPs 1 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2920
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
      2⤵
        PID:2436
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
        2⤵
          PID:1200
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
          2⤵
          • Checks computer location settings
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1636
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c timeout /t 10 & rd /s /q "C:\ProgramData\FIIJJKKFHIEH" & exit
            3⤵
            • Suspicious use of WriteProcessMemory
            PID:848
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 10
              4⤵
              • Delays execution with timeout.exe
              PID:1500

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • memory/1636-10-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-14-0x000000001B700000-0x000000001B95F000-memory.dmp

        Filesize

        2.4MB

      • memory/1636-58-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-2-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-5-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-7-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-57-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-11-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-46-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-28-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-29-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/1636-45-0x0000000000400000-0x0000000000649000-memory.dmp

        Filesize

        2.3MB

      • memory/2920-0-0x0000000000BF0000-0x0000000000BF1000-memory.dmp

        Filesize

        4KB

      • memory/2920-1-0x0000000000BF0000-0x0000000000BF1000-memory.dmp

        Filesize

        4KB

      • memory/2920-3-0x0000000000BF0000-0x0000000000BF1000-memory.dmp

        Filesize

        4KB