Analysis

  • max time kernel
    47s
  • max time network
    91s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    11-09-2024 11:59

General

  • Target

    remcos_a.exe

  • Size

    469KB

  • MD5

    22ce3d0fc9f92829be87f978fc573680

  • SHA1

    2a55144aed0886304b490fbcc623be46a8871065

  • SHA256

    8741e2fc5b709526eaec1e791c56c7d2c65f312940b81e6027bd6ee2b181d940

  • SHA512

    6bcd798e8db887dc0822ba196c2d9efb96fbe604f3728069d0bff04d5862c0d2ac2b4b2d810f310a2ec211e8244ce078b93d72debf427099dbce8f2420d88f4c

  • SSDEEP

    12288:umnk7iLJbpIpiRL6I2WhSKQ9ZsfZQSEn9:WiLJbpI7I2WhQqZ7E9

Malware Config

Extracted

Family

remcos

Botnet

COM Surrogate

C2

stay-daughters.gl.at.ply.gg:43206

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    COM Surrogate.exe

  • copy_folder

    COM Surrogate

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    true

  • install_flag

    true

  • keylog_crypt

    true

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    Windows

  • mouse_option

    false

  • mutex

    Rmc-C5SENV

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    COM Surrogate

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • HawkEye

    HawkEye is a malware kit that has seen continuous development since at least 2013.

  • Remcos

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Program crash 1 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 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 6 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies registry class 34 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 30 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\remcos_a.exe
    "C:\Users\Admin\AppData\Local\Temp\remcos_a.exe"
    1⤵
    • Adds Run key to start application
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2076
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2440
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c "C:\ProgramData\COM Surrogate\COM Surrogate.exe"
        3⤵
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2236
        • C:\ProgramData\COM Surrogate\COM Surrogate.exe
          "C:\ProgramData\COM Surrogate\COM Surrogate.exe"
          4⤵
          • 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:2012
          • \??\c:\program files (x86)\internet explorer\iexplore.exe
            "c:\program files (x86)\internet explorer\iexplore.exe"
            5⤵
            • Adds Run key to start application
            • Suspicious use of SetThreadContext
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: MapViewOfSection
            • Suspicious use of SetWindowsHookEx
            • Suspicious use of WriteProcessMemory
            PID:2728
            • C:\Windows\SysWOW64\svchost.exe
              svchost.exe
              6⤵
                PID:2836
              • C:\Windows\SysWOW64\dxdiag.exe
                "C:\Windows\System32\dxdiag.exe" /t C:\Users\Admin\AppData\Local\Temp\sysinfo.txt
                6⤵
                • Drops file in Windows directory
                • System Location Discovery: System Language Discovery
                • Modifies registry class
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of SetWindowsHookEx
                PID:2624
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 2728 -s 868
                6⤵
                • Program crash
                PID:476

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\ProgramData\COM Surrogate\COM Surrogate.exe

      Filesize

      469KB

      MD5

      22ce3d0fc9f92829be87f978fc573680

      SHA1

      2a55144aed0886304b490fbcc623be46a8871065

      SHA256

      8741e2fc5b709526eaec1e791c56c7d2c65f312940b81e6027bd6ee2b181d940

      SHA512

      6bcd798e8db887dc0822ba196c2d9efb96fbe604f3728069d0bff04d5862c0d2ac2b4b2d810f310a2ec211e8244ce078b93d72debf427099dbce8f2420d88f4c

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

      Filesize

      414B

      MD5

      01ea74daf9b956185c45016b68449bb0

      SHA1

      9d1a18d2c9a9f5ee04dc864adcd92f05577e9392

      SHA256

      1b22904a4106604da03fd63fad1663a3562f928fbe6bfc90af4b8239142e83da

      SHA512

      35566d72fc5739044bcb0ff14741c25aa0892fb6de57831eca737eb6896cd9c1c0837133504cf8df415a8e66196c317b86123967507d39814d3faaf989f8da02

    • C:\Users\Admin\AppData\Local\Temp\sysinfo.txt

      Filesize

      15KB

      MD5

      815c6cabe8fa7a2fb0c3a21ef37551c6

      SHA1

      4574eef39edb92fc1c494073a4bec65ac772d88a

      SHA256

      673486b12feed1e7952ae03c689a787be88018309d8cad0d89a6b83d0f28ed4d

      SHA512

      3d3f368298fe5835b34da2321cd03bf4037322860ecff83fbe577e7813a34fdee16ec6b7b2528a1502581934883efec459a1514b96cacdd15691cc9b5ed0afd1

    • memory/2624-59-0x0000000002FC0000-0x000000000301C000-memory.dmp

      Filesize

      368KB

    • memory/2624-63-0x0000000002890000-0x00000000028BA000-memory.dmp

      Filesize

      168KB

    • memory/2624-61-0x0000000000400000-0x000000000040A000-memory.dmp

      Filesize

      40KB

    • memory/2624-43-0x0000000000400000-0x000000000040A000-memory.dmp

      Filesize

      40KB

    • memory/2624-60-0x0000000002FC0000-0x000000000301C000-memory.dmp

      Filesize

      368KB

    • memory/2624-58-0x0000000002FC0000-0x000000000301C000-memory.dmp

      Filesize

      368KB

    • memory/2624-57-0x0000000002FC0000-0x000000000301C000-memory.dmp

      Filesize

      368KB

    • memory/2624-62-0x0000000002890000-0x00000000028BA000-memory.dmp

      Filesize

      168KB

    • memory/2624-55-0x00000000004A0000-0x00000000004AA000-memory.dmp

      Filesize

      40KB

    • memory/2624-56-0x00000000004A0000-0x00000000004AA000-memory.dmp

      Filesize

      40KB

    • memory/2624-42-0x0000000000400000-0x000000000040A000-memory.dmp

      Filesize

      40KB

    • memory/2728-9-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2728-23-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-31-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-32-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-34-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-35-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-39-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-37-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-38-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-40-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-41-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-24-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-25-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-26-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-69-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-10-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-19-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-68-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-67-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-11-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-12-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-15-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-16-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2728-66-0x0000000000080000-0x00000000000FF000-memory.dmp

      Filesize

      508KB

    • memory/2836-21-0x0000000000130000-0x00000000001AF000-memory.dmp

      Filesize

      508KB

    • memory/2836-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/2836-22-0x0000000000130000-0x00000000001AF000-memory.dmp

      Filesize

      508KB