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Analysis

  • max time kernel
    152s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/05/2023, 11:15

General

  • Target

    FedEx 0037811_UK_2023995286_pdf.exe

  • Size

    475KB

  • MD5

    d2f1d062bc9a850e6cfdf6e3c20c5bd2

  • SHA1

    0365f94938094a7a2b5831080871cb077ea64585

  • SHA256

    6a43f8d13e49fac946dfcd323542f4f77a43c813c9d52a8273d5421f1049fa9e

  • SHA512

    86de1a34f4a9e9d9d0c117df0a9c5131eb3a3058a2deee18a23020c2875dfc10b1671f5fb14fcc842a54858b0f45564729e9cf1a3d5eef0506b4c1a5f5b5adb6

  • SSDEEP

    12288:vY8QzGB54XUqsEeRYThzlP7G4J48ZyO4I2CqM:vY8oa6kueElyCgO4Ih

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

64.112.85.218:4888

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-5VAOMA

  • 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.

  • Loads dropped DLL 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\FedEx 0037811_UK_2023995286_pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\FedEx 0037811_UK_2023995286_pdf.exe"
    1⤵
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:4072
    • C:\Users\Admin\AppData\Local\Temp\FedEx 0037811_UK_2023995286_pdf.exe
      "C:\Users\Admin\AppData\Local\Temp\FedEx 0037811_UK_2023995286_pdf.exe"
      2⤵
        PID:4396

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\nsbA55F.tmp\yfmnzyw.dll

      Filesize

      12KB

      MD5

      f8bc5c1234fa8df202017a16f6089a8e

      SHA1

      2a01dbbd7a406233bf210715e8717ea3143be025

      SHA256

      613e951602b9f6453f8a2b8b152fced5d6927fec4ff6d18408196949b46c5cba

      SHA512

      32375aba9e43fe0f396d96886e3b695eb31be6e2c3594f5ac7db75a0bbb39996401c11aa41cd03fbb4126312bf7f5e7e93631dde3bb3789c71f4855f3a310379

    • memory/4072-141-0x0000000003160000-0x0000000003162000-memory.dmp

      Filesize

      8KB

    • memory/4396-142-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-143-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-144-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-145-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-146-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-147-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-148-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-149-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-150-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-152-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-153-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-154-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-155-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-156-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-157-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-158-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-159-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-160-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-161-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-162-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-163-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-164-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-165-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-166-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-167-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-168-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-169-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-170-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-171-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-172-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-173-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-174-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-175-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB

    • memory/4396-176-0x0000000000400000-0x0000000000480000-memory.dmp

      Filesize

      512KB