Analysis

  • max time kernel
    147s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    24-04-2024 02:17

General

  • Target

    2023_TAX_ORGANIZER/Tax Organizer.exe

  • Size

    31KB

  • MD5

    3e71ed46603b02a94b921411a19b7a5c

  • SHA1

    b1374ef6717635d07015d8acb700cf95b2a66b12

  • SHA256

    1131f33552a12921f6f4d7d9e503feae4b12c367d5377e226acf270f6b58ca6e

  • SHA512

    28555a8bf20e4f8d42b21685c06e429bc5261f75e9fb65b970a322907d7da4a4ee7d367f4637ea4abb6ef32fae8e71a9d92b4f253a201e94548d68281edccbaf

  • SSDEEP

    384:e8Kj/M8yEryzqEt7a9Oey+IFdP64VYaEwDtiBgxoxlnLr2STcEICxXBhgBx4eMDa:eDD1r+VWOV+csoHViBBn+EFIqeMDGvaS

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

faststaynow.duckdns.org:5057

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-Q95C1N

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\Tax Organizer.exe
    "C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\Tax Organizer.exe"
    1⤵
    • Suspicious use of NtCreateThreadExHideFromDebugger
    • Suspicious use of WriteProcessMemory
    PID:2492
    • C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\Tax Organizer.exe
      "C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\Tax Organizer.exe"
      2⤵
        PID:2500
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Chrome" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\HEARTB.dll",EntryPoint /f & exit
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:2604
        • C:\Windows\SysWOW64\reg.exe
          reg add "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /v "*Chrome" /t REG_SZ /d "rundll32.exe C:\Users\Admin\AppData\Roaming\HEARTB.dll",EntryPoint /f
          3⤵
          • Adds Run key to start application
          PID:2572

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/2492-11-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2492-2-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2492-0-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2492-4-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2500-18-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-19-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-9-0x0000000000250000-0x0000000000251000-memory.dmp

      Filesize

      4KB

    • memory/2500-5-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

      Filesize

      4KB

    • memory/2500-12-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-13-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-14-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-15-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-16-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-17-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-1-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-7-0x0000000000250000-0x0000000000251000-memory.dmp

      Filesize

      4KB

    • memory/2500-21-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-22-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-23-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-24-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-25-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-26-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-27-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-28-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-29-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-30-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-31-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB

    • memory/2500-32-0x00000000001C0000-0x0000000000242000-memory.dmp

      Filesize

      520KB