Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    04-06-2024 01:20

General

  • Target

    43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe

  • Size

    779KB

  • MD5

    b8c16305e86cd0c9e66bf9a26bed97c7

  • SHA1

    451b83ee2758b91aabf7f0367241d636b6c1d6f5

  • SHA256

    43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de

  • SHA512

    b1d9548fc78fb8626d7e081d2ded7d86743e4f9136b3314315a5afa096e33858d43d7b9d775a623f7733809b0f06b748033518e9c3ac14a190aff5e71ac6ae9b

  • SSDEEP

    24576:uky1kNvBHoB+vinRETPD1qL63JnPPX8YpYFLxwuXt:uV1klBHoEURETPD1qL63fYN

Malware Config

Extracted

Family

stealc

rc4.plain

Extracted

Family

vidar

C2

https://steamcommunity.com/profiles/76561199689717899

https://t.me/copterwin

Signatures

  • Detect Vidar Stealer 6 IoCs
  • Stealc

    Stealc is an infostealer written in C++.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Detects Windows executables referencing non-Windows User-Agents 6 IoCs
  • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 6 IoCs
  • Detects executables containing potential Windows Defender anti-emulation checks 6 IoCs
  • 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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 NtCreateThreadExHideFromDebugger 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 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe
    "C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of NtCreateThreadExHideFromDebugger
    • Suspicious use of WriteProcessMemory
    PID:3016
    • C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe
      "C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe"
      2⤵
      • Checks computer location settings
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2244
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c timeout /t 10 & del /f /q "C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe" & rd /s /q "C:\ProgramData\ECGDHDHJEBGH" & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4760
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 10
          4⤵
          • Delays execution with timeout.exe
          PID:3424

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • memory/2244-12-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/2244-7-0x00000000000D0000-0x00000000000D1000-memory.dmp

    Filesize

    4KB

  • memory/2244-9-0x0000000000B60000-0x0000000000DA6000-memory.dmp

    Filesize

    2.3MB

  • memory/2244-10-0x0000000000B60000-0x0000000000DA6000-memory.dmp

    Filesize

    2.3MB

  • memory/2244-14-0x0000000000B60000-0x0000000000DA6000-memory.dmp

    Filesize

    2.3MB

  • memory/2244-15-0x0000000000B60000-0x0000000000DA6000-memory.dmp

    Filesize

    2.3MB

  • memory/3016-4-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/3016-6-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/3016-5-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/3016-2-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/3016-1-0x0000000000409000-0x0000000000422000-memory.dmp

    Filesize

    100KB

  • memory/3016-11-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/3016-0-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB