Analysis

  • max time kernel
    119s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-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 8 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 8 IoCs
  • Detects binaries and memory artifacts referencing sandbox DLLs typically observed in sandbox evasion 8 IoCs
  • Detects executables containing potential Windows Defender anti-emulation checks 8 IoCs
  • Deletes itself 1 IoCs
  • 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
  • Modifies system certificate store 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of WriteProcessMemory 18 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:1736
    • C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe
      "C:\Users\Admin\AppData\Local\Temp\43ab8d538551ee2d920b1780bced4a7e97a3e9cf8d6f47b6634219120c1ca3de.exe"
      2⤵
      • Checks processor information in registry
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1760
      • 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\CBAKJKJJJECF" & exit
        3⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:1620
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 10
          4⤵
          • Delays execution with timeout.exe
          PID:2024

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

    Filesize

    70KB

    MD5

    49aebf8cbd62d92ac215b2923fb1b9f5

    SHA1

    1723be06719828dda65ad804298d0431f6aff976

    SHA256

    b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

    SHA512

    bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

  • C:\Users\Admin\AppData\Local\Temp\Tar7872.tmp

    Filesize

    181KB

    MD5

    4ea6026cf93ec6338144661bf1202cd1

    SHA1

    a1dec9044f750ad887935a01430bf49322fbdcb7

    SHA256

    8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

    SHA512

    6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

  • memory/1736-11-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/1736-1-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/1736-2-0x0000000000409000-0x0000000000422000-memory.dmp

    Filesize

    100KB

  • memory/1736-3-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/1736-0-0x0000000000400000-0x00000000004C3000-memory.dmp

    Filesize

    780KB

  • memory/1760-6-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

    Filesize

    4KB

  • memory/1760-4-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-12-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-14-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-13-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-8-0x0000000000320000-0x0000000000321000-memory.dmp

    Filesize

    4KB

  • memory/1760-9-0x0000000000320000-0x0000000000321000-memory.dmp

    Filesize

    4KB

  • memory/1760-67-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-68-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB

  • memory/1760-70-0x00000000000D0000-0x0000000000316000-memory.dmp

    Filesize

    2.3MB