Analysis

  • max time kernel
    147s
  • max time network
    145s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-04-2024 02:17

General

  • Target

    2023_TAX_ORGANIZER/g2m.dll

  • Size

    6.6MB

  • MD5

    dd2a773c6b767755a12e43c02f07d0f4

  • SHA1

    8dac463057c09eca19e4dbadfb3daa2bf501c53e

  • SHA256

    09173af3144979177cd188a990000eba43d627ac5728969a78f186124dc2255b

  • SHA512

    27790b9366a78d4b4e2f368073cb101d8f73b63d989a51396e81d22cf2c8b30736d302d5f434e87cdc584d0e38a5ee9b748be0e832d4f8494fdc8faa99c776dc

  • SSDEEP

    98304:nHQXidDnBW0hcthSDnqDO5rzRQfaxcxV4dqahqlO:6i9gDmyhu+M

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:\Windows\system32\regsvr32.exe
    regsvr32 /s C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\g2m.dll
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4420
    • C:\Windows\SysWOW64\regsvr32.exe
      /s C:\Users\Admin\AppData\Local\Temp\2023_TAX_ORGANIZER\g2m.dll
      2⤵
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of WriteProcessMemory
      PID:2092
      • C:\Windows\SysWOW64\regsvr32.exe
        "C:\Windows\SysWOW64\regsvr32.exe"
        3⤵
          PID:1812
        • 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
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:5112
          • 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
            4⤵
            • Adds Run key to start application
            PID:4840

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/1812-12-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-26-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-13-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-25-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-23-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-7-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-6-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-9-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-10-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-14-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-22-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-2-0x0000000000B10000-0x0000000000B11000-memory.dmp

      Filesize

      4KB

    • memory/1812-11-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-16-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-17-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-18-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-19-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-20-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/1812-21-0x0000000000A80000-0x0000000000B02000-memory.dmp

      Filesize

      520KB

    • memory/2092-1-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2092-4-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2092-5-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB

    • memory/2092-0-0x00000000679E0000-0x0000000068086000-memory.dmp

      Filesize

      6.6MB