Overview

overview

10

Static

static

10

remcos_a.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    57s
  • max time network
    36s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/10/2024, 08:49

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General

  • Target

    remcos_a.exe

  • Size

    469KB

  • MD5

    d987e661f578faf114533d939978d027

  • SHA1

    e73e7be2d0f176cc96f6c659c1072f33745b300a

  • SHA256

    87e3270c895827876c1b3996d3897df3ff6056c8c728e76bcd69f8d7b2f8d9b5

  • SHA512

    d8ac536421fd4a5342d218cfabd263c6a1a062daf36077f7826184d61efdeeb37f12f9cb95f8629dd42a83a44ad27d05d2592d2a4576f45795042a00f169e0d2

  • SSDEEP

    12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSHn9:uiLJbpI7I2WhQqZ7H9

Score
10/10
remcosremotehostdiscoveryevasionpersistencerattrojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

ponscripter-29947.portmap.host:29947

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    scvhost.exe

  • copy_folder

    Remcos

  • delete_file

    true

  • hide_file

    true

  • hide_keylog_file

    false

  • install_flag

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-5GPHJT

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    scvhost

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

    ratremcos
  • UAC bypass 3 TTPs 2 IoCs
    evasiontrojan
  • Adds policy Run key to start application 2 TTPs 4 IoCs
    persistence
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
    persistence
  • 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 8 IoCs

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

    discovery
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Modifies registry class 1 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 48 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of FindShellTrayWindow 64 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
    "C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
    1⤵
    • Adds policy Run key to start application
    • Checks computer location settings
    • Adds Run key to start application
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:112
    • C:\Windows\SysWOW64\cmd.exe
      /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4404
      • C:\Windows\SysWOW64\reg.exe
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        3⤵
        • UAC bypass
        • System Location Discovery: System Language Discovery
        • Modifies registry key
        PID:4484
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      2⤵
      • Checks computer location settings
      • Deletes itself
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4464
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Remcos\scvhost.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1196
        • C:\ProgramData\Remcos\scvhost.exe
          C:\ProgramData\Remcos\scvhost.exe
          4⤵
          • Adds policy Run key to start application
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetThreadContext
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of WriteProcessMemory
          PID:3976
          • C:\Windows\SysWOW64\cmd.exe
            /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
            5⤵
            • System Location Discovery: System Language Discovery
            • Suspicious use of WriteProcessMemory
            PID:2600
            • C:\Windows\SysWOW64\reg.exe
              C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
              6⤵
              • UAC bypass
              • System Location Discovery: System Language Discovery
              • Modifies registry key
              PID:3472
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
              PID:3640
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:4248

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\ProgramData\Remcos\scvhost.exe
      Filesize

      469KB

      MD5

      d987e661f578faf114533d939978d027

      SHA1

      e73e7be2d0f176cc96f6c659c1072f33745b300a

      SHA256

      87e3270c895827876c1b3996d3897df3ff6056c8c728e76bcd69f8d7b2f8d9b5

      SHA512

      d8ac536421fd4a5342d218cfabd263c6a1a062daf36077f7826184d61efdeeb37f12f9cb95f8629dd42a83a44ad27d05d2592d2a4576f45795042a00f169e0d2

      Download Submit

    • C:\Users\Admin\AppData\Local\Temp\install.vbs
      Filesize

      516B

      MD5

      ebc4355811bbd16dea05e50be0c10b5c

      SHA1

      597cf471e93d48a76a3ad4817058d633c6fa371c

      SHA256

      c722cb5cfbcd8db3d43e89157912259b7678a3757a761d9a14b5aca09e4adff7

      SHA512

      1b941f704481f520b17408437463e2531bdaddb32172a90a6942975c282cbf92b35d78b512aa61f244ccf30d587c9f1a2b7a982251d14409696c3cefbacfc5fc

      Download Submit

    • memory/3640-9-0x0000000000E00000-0x0000000000E7F000-memory.dmp

      Filesize

      508KB

      Download

    • memory/3640-10-0x0000000000E00000-0x0000000000E7F000-memory.dmp

      Filesize

      508KB

      Download

    • memory/4248-13-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-12-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-11-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-21-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-23-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-22-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-20-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-19-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-17-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download

    • memory/4248-18-0x00000185B2ED0000-0x00000185B2ED1000-memory.dmp

      Filesize

      4KB

      Download