Analysis

  • max time kernel
    299s
  • max time network
    300s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    31/10/2024, 02:37

General

  • Target

    77954-668716095406000-20240826160944.pdf.exe

  • Size

    3.7MB

  • MD5

    9716314d2e2df9ef07b0a5e62594ec54

  • SHA1

    4b77033c3a9c5c897c288c57fb5c9c55d57236e9

  • SHA256

    7d9a4ed0a06ed9371e27c634f50c6aed4ebc1869c4a094287b03a6be4b810c63

  • SHA512

    5acac2ba47c101095d4b0efaf1737b6044977f9547a846f615be67f9bee77c5f6b1361b95308f26e311642ce39909510a0d80a35607d0571a5ca25b6a83b4ee3

  • SSDEEP

    24576:CgkzHf6uxcDC8VeaAOJ5o+cPugMB5jrgjafY9M:CgkzHyacDXVei+2FB0jj9M

Malware Config

Extracted

Family

remcos

Botnet

Host

C2

oyo.work.gd:3142

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    vlc

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    pdf

  • mouse_option

    false

  • mutex

    jkm-I9KENP

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    ios

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Remcos family
  • UAC bypass 3 TTPs 1 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Looks for VMWare Tools registry key 2 TTPs 1 IoCs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

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

  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

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

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

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

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 32 IoCs
  • System policy modification 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\77954-668716095406000-20240826160944.pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\77954-668716095406000-20240826160944.pdf.exe"
    1⤵
    • UAC bypass
    • Looks for VirtualBox Guest Additions in registry
    • Looks for VMWare Tools registry key
    • Checks BIOS information in registry
    • Checks whether UAC is enabled
    • Maps connected drives based on registry
    • Suspicious use of SetThreadContext
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:1372
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\77954-668716095406000-20240826160944.pdf.exe" -Force
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2928
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
      2⤵
        PID:2088
      • C:\Program Files (x86)\Windows Media Player\wmplayer.exe
        "C:\Program Files (x86)\Windows Media Player\wmplayer.exe"
        2⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:2188
      • C:\Program Files (x86)\Windows Media Player\wmplayer.exe
        "C:\Program Files (x86)\Windows Media Player\wmplayer.exe"
        2⤵
          PID:3024

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • C:\ProgramData\pdf\logs.dat

              Filesize

              144B

              MD5

              7f06237694441d6c770c3598ba4f95f2

              SHA1

              37b996c5dce136dcf6d434df9534b1b51960ac5f

              SHA256

              4dea512c815030dc89ae42d139fff37e27544eba7bbb2b0862c98f48de029d88

              SHA512

              dee250b5125bc3b9943ec7f191ff535ae6c67f1cd81cb8edbdb0e2897ff18318183cfd594786448128fdd631c0a623e2897b3084914ea62e01e8c0b32066196a

            • memory/1372-38-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

              Filesize

              9.9MB

            • memory/1372-1-0x0000000000A30000-0x0000000000A44000-memory.dmp

              Filesize

              80KB

            • memory/1372-2-0x000007FEF5FD0000-0x000007FEF69BC000-memory.dmp

              Filesize

              9.9MB

            • memory/1372-3-0x000000001AA20000-0x000000001AAEE000-memory.dmp

              Filesize

              824KB

            • memory/1372-0-0x000007FEF5FD3000-0x000007FEF5FD4000-memory.dmp

              Filesize

              4KB

            • memory/2088-12-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-11-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-10-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-9-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-8-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-4-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-13-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2088-6-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-51-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-60-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-40-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-39-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-80-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-36-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2188-44-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-45-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-46-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-47-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-48-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-50-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-37-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-52-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-53-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-55-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-56-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-57-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-58-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-43-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-61-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-62-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-63-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-64-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-66-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-67-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-68-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-69-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-79-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-71-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-72-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-73-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-74-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-76-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-77-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2188-78-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/2928-18-0x000000001B5F0000-0x000000001B8D2000-memory.dmp

              Filesize

              2.9MB

            • memory/2928-19-0x0000000002250000-0x0000000002258000-memory.dmp

              Filesize

              32KB