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Overview

overview

10

Static

static

10

ApiUpdater.exe

windows7-x64

10

ApiUpdater.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    95s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/01/2025, 07:01

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General

  • Target

    ApiUpdater.exe

  • Size

    469KB

  • MD5

    ebf341ab1088ab009a9f9cf06619e616

  • SHA1

    a31d5650c010c421fa81733e4841cf1b52d607d9

  • SHA256

    7422bc2c77e70c2e90c27d030a13eb3adf0bcfc1ef2bc55b62871181af5cd955

  • SHA512

    40c1481642f8ad2fed9514d0968a43151a189c61e53d60990183e81c16891cdd7a0983568b2910dc8a9098a408136468cff5660d0607cf06331275937c1f60e1

  • SSDEEP

    12288:Wmnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSin9:uiLJbpI7I2WhQqZ7i9

Score
10/10
remcosremotehostdefense_evasiondiscoverypersistencerattrojan

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

    $77-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-Z3DS2J

  • 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
    defense_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\ApiUpdater.exe
    "C:\Users\Admin\AppData\Local\Temp\ApiUpdater.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:3748
    • 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:1296
      • 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:3416
    • 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:552
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\Bitdefender\$77-Bitdefender.exe"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2460
        • C:\ProgramData\Bitdefender\$77-Bitdefender.exe
          C:\ProgramData\Bitdefender\$77-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:1600
          • 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:1416
            • 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:3160
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
              PID:2604

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\ProgramData\Bitdefender\$77-Bitdefender.exe
      Filesize

      469KB

      MD5

      ebf341ab1088ab009a9f9cf06619e616

      SHA1

      a31d5650c010c421fa81733e4841cf1b52d607d9

      SHA256

      7422bc2c77e70c2e90c27d030a13eb3adf0bcfc1ef2bc55b62871181af5cd955

      SHA512

      40c1481642f8ad2fed9514d0968a43151a189c61e53d60990183e81c16891cdd7a0983568b2910dc8a9098a408136468cff5660d0607cf06331275937c1f60e1

      Download Submit

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

      546B

      MD5

      b589da137125da0d605bf425b360e9b7

      SHA1

      091b07b800133033ba4ba930a7acb4559c0df6f5

      SHA256

      a9b357b7a182158e54e22ce3e78a6ffaaa5bb25b08717d69d591a92429d39bac

      SHA512

      2bf73d9c2f573c714f7325d6ca279c0c1b2b8e90b7457caafa6174319df0490710affc25b6c185e5730bfd31c9e0539e51e35ac625a5c6d990ca8552e3a53de0

      Download Submit

    • memory/2604-9-0x0000000000900000-0x000000000097F000-memory.dmp

      Filesize

      508KB

      Download

    • memory/2604-10-0x0000000000900000-0x000000000097F000-memory.dmp

      Filesize

      508KB

      Download