Overview

overview

10

Static

static

10

stub.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    302s
  • max time network
    309s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20-11-2024 10:30

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General

  • Target

    stub.exe

  • Size

    469KB

  • MD5

    eecc6454151bd19031cb2b258d2a4c9b

  • SHA1

    1bfe8c247be8682c2f620e48ac33175e14f81dda

  • SHA256

    c1a6955a83cac6e02e942ec2537754e00fa46c31fe9256dba3080580dfed2f42

  • SHA512

    b7b9160ecd87fa031a1db6d0cc5ea4748cf6979f7147779586b8a612d285798beb4a012d17dd4a5aa7311a6109f77115ea857162a8348462edc3bde508b7e9c5

  • SSDEEP

    12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSgn9:uiLJbpI7I2WhQqZ7g9

Score
10/10
remcosremotehostdiscoveryevasionpersistencerattrojan

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

else-directors.gl.at.ply.gg:56448

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    Bitdefender.exe

  • copy_folder

    Bitdefender

  • 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-WZKDKV

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    VisualStudioServer

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

    ratremcos
  • Remcos family
    remcos
  • 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
  • Modifies registry class 1 IoCs
  • Modifies registry key 1 TTPs 2 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 25 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\stub.exe
    "C:\Users\Admin\AppData\Local\Temp\stub.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:3868
    • 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:2556
      • 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:5024
    • 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:3652
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Bitdefender\Bitdefender.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1960
        • C:\ProgramData\Bitdefender\Bitdefender.exe
          C:\ProgramData\Bitdefender\Bitdefender.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:2636
          • 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:3696
            • 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:2020
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
              PID:776

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\ProgramData\Bitdefender\Bitdefender.exe
      Filesize

      469KB

      MD5

      eecc6454151bd19031cb2b258d2a4c9b

      SHA1

      1bfe8c247be8682c2f620e48ac33175e14f81dda

      SHA256

      c1a6955a83cac6e02e942ec2537754e00fa46c31fe9256dba3080580dfed2f42

      SHA512

      b7b9160ecd87fa031a1db6d0cc5ea4748cf6979f7147779586b8a612d285798beb4a012d17dd4a5aa7311a6109f77115ea857162a8348462edc3bde508b7e9c5

      Download Submit

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

      526B

      MD5

      97c3d0c687f8fce413698cb3cd93a436

      SHA1

      457bdaecd0ed1a105efa42d31ba7737e5f71d76d

      SHA256

      d133a68455e1837b70a85cce64e82d69f9cf8b04554c84b592bfe1fd97f98860

      SHA512

      1a417f68919258c14f5f467533af7f84fdd42bbf5005ba5a1fe744cd08298c2b818f3362f4dacedc23da991f931caceccdfadab978d1b916a03906669276cfe3

      Download Submit

    • memory/776-9-0x0000000001000000-0x000000000107F000-memory.dmp

      Filesize

      508KB

      Download

    • memory/776-10-0x0000000001000000-0x000000000107F000-memory.dmp

      Filesize

      508KB

      Download