Overview

overview

10

Static

static

10

remcos_a.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    23s
  • max time network
    18s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/10/2024, 08:48

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General

  • Target

    remcos_a.exe

  • Size

    469KB

  • MD5

    5f76223237573a4d197cd76ec95efa77

  • SHA1

    1dc235c847fe2710e6aeb0706e6bb7e042fc52f4

  • SHA256

    230cfbb0fd4e01efb2297d0d9afaacafc02bdbe86fda21684c4da9596d831064

  • SHA512

    d6e1d38bfe7bfa1146df993d5a2d25a78c13e5cae24ba31e3c35ff674b086c4a3fa1d9a00de45e8664f1278d2c4ef86c4174f5d50ca584cb33f64f0f266ac9e3

  • SSDEEP

    12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSYn9:uiLJbpI7I2WhQqZ7Y9

Score
10/10
remcosremotehostdiscoveryevasionpersistencerattrojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

core-hook.gl.at.ply.gg:7242

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    scvhost.exe

  • copy_folder

    files

  • 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-CIGHU4

  • 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 6 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 24 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 33 IoCs
  • Suspicious use of SendNotifyMessage 33 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:3780
    • 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:4044
      • 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:1760
    • 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:4684
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\files\scvhost.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:3468
        • C:\ProgramData\files\scvhost.exe
          C:\ProgramData\files\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: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of WriteProcessMemory
          PID:4836
          • 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:1044
            • 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:2484
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
              PID:4020
    • C:\Windows\system32\taskmgr.exe
      "C:\Windows\system32\taskmgr.exe" /4
      1⤵
      • Checks SCSI registry key(s)
      • Modifies registry class
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      PID:4312
    • C:\Windows\System32\rundll32.exe
      C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
      1⤵
        PID:4372

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        469KB

        MD5

        5f76223237573a4d197cd76ec95efa77

        SHA1

        1dc235c847fe2710e6aeb0706e6bb7e042fc52f4

        SHA256

        230cfbb0fd4e01efb2297d0d9afaacafc02bdbe86fda21684c4da9596d831064

        SHA512

        d6e1d38bfe7bfa1146df993d5a2d25a78c13e5cae24ba31e3c35ff674b086c4a3fa1d9a00de45e8664f1278d2c4ef86c4174f5d50ca584cb33f64f0f266ac9e3

        Download Submit

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

        514B

        MD5

        9d2db12fdee68d03ad85ea1f3b3bdcdf

        SHA1

        fc9c810cfff2f4a5a35a2be45cb35e4ce781aaae

        SHA256

        4f7744cd5bad4282a5ab21e837f84dbc8dd9882940816a302649f3cbba7d61d3

        SHA512

        8c87d1315c8faa6da70cedad811363703391a72cc0aa2f849545cdab02a61b28bc54a4683c87554f6da209034e65f62e7c2135062b979c1c6f15dce396d8801d

        Download Submit

      • memory/4020-9-0x0000000001120000-0x000000000119F000-memory.dmp

        Filesize

        508KB

        Download

      • memory/4020-10-0x0000000001120000-0x000000000119F000-memory.dmp

        Filesize

        508KB

        Download

      • memory/4312-13-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-12-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-11-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-17-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-23-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-22-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-21-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-20-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-19-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download

      • memory/4312-18-0x00000275FC170000-0x00000275FC171000-memory.dmp

        Filesize

        4KB

        Download