Analysis

  • max time kernel
    300s
  • max time network
    304s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-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
  • Windows security bypass 2 TTPs 2 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 computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Windows security modification 2 TTPs 3 IoCs
  • 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 27 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
    • Windows security bypass
    • Looks for VirtualBox Guest Additions in registry
    • Looks for VMWare Tools registry key
    • Checks BIOS information in registry
    • Checks computer location settings
    • Windows security modification
    • 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:2388
    • 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:4484
    • C:\Windows\System32\svchost.exe
      "C:\Windows\System32\svchost.exe"
      2⤵
        PID:1848
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
        2⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:4388
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
        2⤵
          PID:928

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            • C:\ProgramData\pdf\logs.dat

              Filesize

              144B

              MD5

              375d2d2b9d88fa53c873a11188c34fc0

              SHA1

              caba0078ec7ef618c175758e6406dbad3bbf2d40

              SHA256

              5c47a8af74ff4ba640dd5032ba8b36838048db9deda6c9c6ce307953e821c44d

              SHA512

              0ad556eced9d2fc1068f7d9cd51288101811df831d5234bb019ae18e3ec47e32c976375ff8dc63ea933effc7d181bc99e3c592855b83f06914ca06204d83c6e4

            • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ajvl4gax.0zq.ps1

              Filesize

              60B

              MD5

              d17fe0a3f47be24a6453e9ef58c94641

              SHA1

              6ab83620379fc69f80c0242105ddffd7d98d5d9d

              SHA256

              96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

              SHA512

              5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

            • memory/2388-29-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/2388-0-0x00000164E49F0000-0x00000164E4A04000-memory.dmp

              Filesize

              80KB

            • memory/2388-1-0x00007FFB290C3000-0x00007FFB290C5000-memory.dmp

              Filesize

              8KB

            • memory/2388-2-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/2388-3-0x00000164E66A0000-0x00000164E676E000-memory.dmp

              Filesize

              824KB

            • memory/4388-55-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-61-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-21-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-24-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-25-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-105-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-104-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-102-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-101-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-99-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-19-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-30-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-31-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-33-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-34-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-35-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-37-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-38-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-39-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-40-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-42-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-43-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-44-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-46-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-47-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-48-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-18-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-50-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-51-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-53-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-54-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-16-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-56-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-62-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-23-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-59-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-58-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-63-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-64-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-66-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-67-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-69-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-70-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-71-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-73-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-74-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-75-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-77-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-78-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-79-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-81-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-82-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-83-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-85-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-86-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-87-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-89-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-90-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-91-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-93-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-94-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-96-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-97-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4388-98-0x0000000000400000-0x000000000047F000-memory.dmp

              Filesize

              508KB

            • memory/4484-28-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/4484-17-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/4484-15-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/4484-10-0x00007FFB290C0000-0x00007FFB29B81000-memory.dmp

              Filesize

              10.8MB

            • memory/4484-4-0x00000238FF780000-0x00000238FF7A2000-memory.dmp

              Filesize

              136KB