Overview

overview

10

Static

static

10

remcos_a.exe

windows7-x64

10

remcos_a.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    133s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/10/2024, 09:52

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General

  • Target

    remcos_a.exe

  • Size

    469KB

  • MD5

    285656e57001e3aeafcf8a88529a3de6

  • SHA1

    c4f53e6f8ed42c1c5cda0bb79c50c1913e00d7d5

  • SHA256

    58f4cc11fbdc77c519550d82efc187dc282e2830dcb6240f7d9d118a53656d0e

  • SHA512

    7f158c9b9a8331a5fb189fa8d2115d96459e1a8f30f5bae503754874b81e67c5620a080125e420722780895c9515511f4e1fa3f016c711bc058e7a64eba336d4

  • SSDEEP

    12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQS9Gn9:uiLJbpI7I2WhQqZ7s9

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

    DllSetup.exe

  • copy_folder

    dllplugins

  • delete_file

    true

  • hide_file

    true

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %WinDir%\System32

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-AB5LV3

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    Remcos

  • 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
  • Drops file in System32 directory 3 IoCs
  • 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\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
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1064
    • 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:532
      • 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:4676
    • 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:1968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\Windows\SysWOW64\dllplugins\DllSetup.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2120
        • C:\Windows\SysWOW64\dllplugins\DllSetup.exe
          C:\Windows\SysWOW64\dllplugins\DllSetup.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:5008
          • 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:2104
            • 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:1292
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
              PID:2932

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

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

      536B

      MD5

      19523a09e476e3d57c6c545a1a18b85d

      SHA1

      b51dacc3bdcffc59aee76a8d5227030e71e96118

      SHA256

      351ff79dc392c547e1eb23371fd3e740fcb6e9d2a9ab2ab123ec0ebe7bea4517

      SHA512

      d18216d67c1195118e97a78e0a7267f680eb42ae7410d93a45fb66cca9489fb683edd2e51670df67e9d2895e9c97003a8199757d15829edaf0af5608586a2ab4

      Download Submit

    • C:\Windows\SysWOW64\dllplugins\DllSetup.exe
      Filesize

      469KB

      MD5

      285656e57001e3aeafcf8a88529a3de6

      SHA1

      c4f53e6f8ed42c1c5cda0bb79c50c1913e00d7d5

      SHA256

      58f4cc11fbdc77c519550d82efc187dc282e2830dcb6240f7d9d118a53656d0e

      SHA512

      7f158c9b9a8331a5fb189fa8d2115d96459e1a8f30f5bae503754874b81e67c5620a080125e420722780895c9515511f4e1fa3f016c711bc058e7a64eba336d4

      Download Submit

    • memory/2932-9-0x0000000000600000-0x000000000067F000-memory.dmp

      Filesize

      508KB

      Download

    • memory/2932-10-0x0000000000600000-0x000000000067F000-memory.dmp

      Filesize

      508KB

      Download