Analysis

  • max time kernel
    172s
  • max time network
    301s
  • platform
    windows10_x64
  • resource
    win10-en-20210920
  • submitted
    29-09-2021 00:24

General

  • Target

    invoice_2818144.vbs

  • Size

    226B

  • MD5

    fce037aad780c08c85db2f24bff80cfa

  • SHA1

    881fc64b6fe1dad9459327e931399635fc1fe27c

  • SHA256

    cb77b93150cb0f7fe65ce8a7e2a5781e727419451355a7736db84109fa215a89

  • SHA512

    cc3b7adfa276163c33fd5cb62dacf0ae754d53d749b0ed95686a42344ecd1cb94a712f89cc6a2ddaae2eaff90a6ac9913fd368ce196612a2a861fba9eecfbb95

Malware Config

Extracted

Family

remcos

Version

3.2.1 Pro

Botnet

RemoteHost

C2

snackebay.ddns.net:7676

Attributes
  • audio_folder

    MicRecords

  • audio_path

    %AppData%

  • 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

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remasascos-LVXDHO

  • 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

  • take_screenshot_title

    notepad;solitaire;

Signatures

  • Registers COM server for autorun 1 TTPs
  • Remcos

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

  • Blocklisted process makes network request 3 IoCs
  • Drops startup file 2 IoCs
  • Loads dropped DLL 4 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 17 IoCs
  • Suspicious use of WriteProcessMemory 51 IoCs

Processes

  • C:\Windows\System32\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\invoice_2818144.vbs"
    1⤵
    • Blocklisted process makes network request
    • Suspicious use of WriteProcessMemory
    PID:3624
    • C:\Windows\SYSWOW64\WSCRIPT.EXE
      "C:\Windows\SYSWOW64\WSCRIPT.EXE" //b //e:vbscript "C:\Users\Admin\AppData\Local\Temp\invoice_2818144.vbs"
      2⤵
      • Drops startup file
      • Loads dropped DLL
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:4296
      • C:\Windows\SysWOW64\regsvr32.exe
        "C:\Windows\System32\regsvr32.exe" /I /S "C:\Users\Admin\AppData\Local\Temp\dynwrapx.dll"
        3⤵
        • Loads dropped DLL
        • Modifies registry class
        PID:3996
      • C:\Windows\winhlp32.exe
        "C:\Windows\winhlp32.exe"
        3⤵
        • Drops file in Windows directory
        • Modifies registry class
        • Suspicious use of WriteProcessMemory
        PID:4052
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\fknposccdrxufeqxvxheqn.vbs"
          4⤵
            PID:736
        • C:\Windows\SysWOW64\regsvr32.exe
          "C:\Windows\System32\regsvr32.exe" /I /S "C:\Users\Admin\AppData\Local\Temp\dynwrapx.dll"
          3⤵
          • Loads dropped DLL
          • Modifies registry class
          PID:3968
        • C:\Windows\winhlp32.exe
          "C:\Windows\winhlp32.exe"
          3⤵
            PID:4380
          • C:\Windows\SysWOW64\regsvr32.exe
            "C:\Windows\System32\regsvr32.exe" /I /S "C:\Users\Admin\AppData\Local\Temp\dynwrapx.dll"
            3⤵
            • Loads dropped DLL
            • Modifies registry class
            PID:4360
          • C:\Windows\winhlp32.exe
            "C:\Windows\winhlp32.exe"
            3⤵
              PID:4568

        Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\QT2UOKDP\tS4yR[1].txt

          MD5

          59001a5614e309d1a6819cab35eeb377

          SHA1

          21561ee502a20a001a444e6c325021e2f7925fd1

          SHA256

          0d718ab19003d61ffece45beef64680d2543d64db8533eccc4ec522777bfd2f1

          SHA512

          bc4ff36ec2a80c0bdda848465370c2315a9ff42005342d54275b74c6d7356d8f53ecd41b1119dd3ad5e38b18d555d8d19e263d331edad828918c1f949336712a

        • C:\Users\Admin\AppData\Local\Temp\dynwrapx.dll

          MD5

          e0b8dfd17b8e7de760b273d18e58b142

          SHA1

          801509fb6783c9e57edc67a72dde3c62080ffbaf

          SHA256

          4ef3a6703abc6b2b8e2cac3031c1e5b86fe8b377fde92737349ee52bd2604379

          SHA512

          443359da27b3c87e81ae4f4b9a2ab7e7bf6abfa93551fc62347a0b79b36d79635131abc14d4deddab3ace12fdf973496518f67e1be8dc4903b35fd465835556b

        • C:\Users\Admin\AppData\Local\Temp\fknposccdrxufeqxvxheqn.vbs

          MD5

          2fcc53839a07381c433bebe1f3bd1b7f

          SHA1

          07bcf6958c15af4b3d5ef8e93cf508da996d1e77

          SHA256

          71f0a43e515536c7786776aeaedb1087e4675d4e7edc83b36bc89327cf2571dd

          SHA512

          494be1560e61ad79e324ba0ec65e67af28780b2ff19f5ea1107a8f2b09ba9055591e835c6e39dade08840dd7125d25cd2d3710fcd5a1afa4767f18177d521b25

        • \Users\Admin\AppData\Local\Temp\dynwrapx.dll

          MD5

          e0b8dfd17b8e7de760b273d18e58b142

          SHA1

          801509fb6783c9e57edc67a72dde3c62080ffbaf

          SHA256

          4ef3a6703abc6b2b8e2cac3031c1e5b86fe8b377fde92737349ee52bd2604379

          SHA512

          443359da27b3c87e81ae4f4b9a2ab7e7bf6abfa93551fc62347a0b79b36d79635131abc14d4deddab3ace12fdf973496518f67e1be8dc4903b35fd465835556b

        • \Users\Admin\AppData\Local\Temp\dynwrapx.dll

          MD5

          e0b8dfd17b8e7de760b273d18e58b142

          SHA1

          801509fb6783c9e57edc67a72dde3c62080ffbaf

          SHA256

          4ef3a6703abc6b2b8e2cac3031c1e5b86fe8b377fde92737349ee52bd2604379

          SHA512

          443359da27b3c87e81ae4f4b9a2ab7e7bf6abfa93551fc62347a0b79b36d79635131abc14d4deddab3ace12fdf973496518f67e1be8dc4903b35fd465835556b

        • \Users\Admin\AppData\Local\Temp\dynwrapx.dll

          MD5

          e0b8dfd17b8e7de760b273d18e58b142

          SHA1

          801509fb6783c9e57edc67a72dde3c62080ffbaf

          SHA256

          4ef3a6703abc6b2b8e2cac3031c1e5b86fe8b377fde92737349ee52bd2604379

          SHA512

          443359da27b3c87e81ae4f4b9a2ab7e7bf6abfa93551fc62347a0b79b36d79635131abc14d4deddab3ace12fdf973496518f67e1be8dc4903b35fd465835556b

        • \Users\Admin\AppData\Local\Temp\dynwrapx.dll

          MD5

          e0b8dfd17b8e7de760b273d18e58b142

          SHA1

          801509fb6783c9e57edc67a72dde3c62080ffbaf

          SHA256

          4ef3a6703abc6b2b8e2cac3031c1e5b86fe8b377fde92737349ee52bd2604379

          SHA512

          443359da27b3c87e81ae4f4b9a2ab7e7bf6abfa93551fc62347a0b79b36d79635131abc14d4deddab3ace12fdf973496518f67e1be8dc4903b35fd465835556b

        • memory/736-141-0x0000000000000000-mapping.dmp

        • memory/3968-125-0x0000000000000000-mapping.dmp

        • memory/3996-117-0x0000000000000000-mapping.dmp

        • memory/4052-128-0x0000000000400000-0x0000000000479000-memory.dmp

          Filesize

          484KB

        • memory/4052-122-0x000000000042F71D-mapping.dmp

        • memory/4052-121-0x0000000000400000-0x0000000000479000-memory.dmp

          Filesize

          484KB

        • memory/4296-127-0x0000000004FB0000-0x0000000004FB1000-memory.dmp

          Filesize

          4KB

        • memory/4296-115-0x0000000000000000-mapping.dmp

        • memory/4360-132-0x0000000000000000-mapping.dmp

        • memory/4380-130-0x000000000042F71D-mapping.dmp

        • memory/4380-135-0x0000000000400000-0x0000000000479000-memory.dmp

          Filesize

          484KB

        • memory/4568-137-0x000000000042F71D-mapping.dmp

        • memory/4568-140-0x0000000000400000-0x0000000000479000-memory.dmp

          Filesize

          484KB