Analysis

  • max time kernel
    147s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-12-2024 02:23

General

  • Target

    4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe

  • Size

    820KB

  • MD5

    a75036f188683604d03dd8f03fee6ec3

  • SHA1

    cc2c07398c85ffcd033223d01155851647d0ee68

  • SHA256

    4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531

  • SHA512

    2a32707969a776c20150ab79b62204918ad6a96599acc99c7d6e99ce1c43eadb77fdf79c0dc59eb517005ab16d6aaa28ab229e68d20bf087ec82a957837390e1

  • SSDEEP

    12288:7b0EifOJq8Ikm2qv1GV8gmxJziOoA3TB98/0v7Z0Q9i4xw3u5IDkd72gGmkRJWk6:7bxgGKLz8G/XBO/0vOAi4xwk9VS6n

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

myfreeenedd.ru:2404

Attributes
  • audio_folder

    MicRecords

  • audio_path

    ApplicationPath

  • 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-E5Y2QK

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • Remcos family
  • Detected Nirsoft tools 7 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of NtCreateThreadExHideFromDebugger 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Drops file in Program Files directory 1 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious behavior: MapViewOfSection 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe
    "C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious use of SetThreadContext
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: MapViewOfSection
    • Suspicious use of WriteProcessMemory
    PID:4316
    • C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe
      "C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious use of NtCreateThreadExHideFromDebugger
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetThreadContext
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2672
      • C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe
        C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe /stext "C:\Users\Admin\AppData\Local\Temp\bmdtffefvdxvhyswgwzarbb"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        PID:4508
      • C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe
        C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe /stext "C:\Users\Admin\AppData\Local\Temp\lgrmgxohjlpakeoixylccgobhp"
        3⤵
        • Accesses Microsoft Outlook accounts
        • System Location Discovery: System Language Discovery
        PID:3920
      • C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe
        C:\Users\Admin\AppData\Local\Temp\4c1df01c44c5a69f9efa30528117c3d90f2df8a78c23a7ccc25412da15793531.exe /stext "C:\Users\Admin\AppData\Local\Temp\oiwehqzbfthnukcmhjgvftisivmtzr"
        3⤵
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4452

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\ProgramData\remcos\logs.dat

    Filesize

    144B

    MD5

    34a2ffd33caece22fe8d5a7827c5ebfb

    SHA1

    9e7bb480b48825d89cc4dad764dfd0373480ab27

    SHA256

    11b4b15e7fbfb40c0a5a27655934d6a68b882f278b70b5e1ab51d905c10f2b4e

    SHA512

    91d1f888c4e6f6334b102183e3adbf2adf406989b262ff9b67a9b9653c3b477d24d0795442c3768d18936987c5681e213fb190e088f242f6761f3024844a7e97

  • C:\Users\Admin\AppData\Local\Temp\bmdtffefvdxvhyswgwzarbb

    Filesize

    4KB

    MD5

    ac300aeaf27709e2067788fdd4624843

    SHA1

    e98edd4615d35de96e30f1a0e13c05b42ee7eb7b

    SHA256

    d2637d58bb120dc6fefe2f38d6e0d4b308006b8639106a7f9e915fa80b5cc9d9

    SHA512

    09c46e708f9d253dccd4d943639d9f8126f868ae3dcd951aad12222bb98b5d3814676f878c8391b9bdab5dedcf5b9e9eaeb2ad3ffec57bda875198735586d4df

  • C:\Users\Admin\AppData\Local\Temp\nsd8119.tmp\System.dll

    Filesize

    11KB

    MD5

    b0c77267f13b2f87c084fd86ef51ccfc

    SHA1

    f7543f9e9b4f04386dfbf33c38cbed1bf205afb3

    SHA256

    a0cac4cf4852895619bc7743ebeb89f9e4927ccdb9e66b1bcd92a4136d0f9c77

    SHA512

    f2b57a2eea00f52a3c7080f4b5f2bb85a7a9b9f16d12da8f8ff673824556c62a0f742b72be0fd82a2612a4b6dbd7e0fdc27065212da703c2f7e28d199696f66e

  • memory/2672-93-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-87-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-39-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/2672-41-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/2672-105-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-96-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-31-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-29-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/2672-90-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-35-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-84-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-109-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-81-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-78-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-76-0x0000000000460000-0x00000000016B4000-memory.dmp

    Filesize

    18.3MB

  • memory/2672-72-0x00000000373F0000-0x0000000037409000-memory.dmp

    Filesize

    100KB

  • memory/2672-73-0x00000000373F0000-0x0000000037409000-memory.dmp

    Filesize

    100KB

  • memory/2672-67-0x00000000373F0000-0x0000000037409000-memory.dmp

    Filesize

    100KB

  • memory/2672-45-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/3920-51-0x0000000000400000-0x0000000000462000-memory.dmp

    Filesize

    392KB

  • memory/3920-56-0x0000000000400000-0x0000000000462000-memory.dmp

    Filesize

    392KB

  • memory/3920-49-0x0000000000400000-0x0000000000462000-memory.dmp

    Filesize

    392KB

  • memory/3920-47-0x0000000000400000-0x0000000000462000-memory.dmp

    Filesize

    392KB

  • memory/3920-59-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/4316-28-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/4452-64-0x0000000000400000-0x0000000000424000-memory.dmp

    Filesize

    144KB

  • memory/4452-58-0x0000000000400000-0x0000000000424000-memory.dmp

    Filesize

    144KB

  • memory/4452-61-0x0000000000400000-0x0000000000424000-memory.dmp

    Filesize

    144KB

  • memory/4452-62-0x0000000000400000-0x0000000000424000-memory.dmp

    Filesize

    144KB

  • memory/4452-60-0x0000000000400000-0x0000000000424000-memory.dmp

    Filesize

    144KB

  • memory/4508-55-0x00007FFBE22F0000-0x00007FFBE24E5000-memory.dmp

    Filesize

    2.0MB

  • memory/4508-71-0x0000000000400000-0x0000000000478000-memory.dmp

    Filesize

    480KB

  • memory/4508-46-0x0000000000400000-0x0000000000478000-memory.dmp

    Filesize

    480KB

  • memory/4508-42-0x0000000000400000-0x0000000000478000-memory.dmp

    Filesize

    480KB

  • memory/4508-50-0x0000000000400000-0x0000000000478000-memory.dmp

    Filesize

    480KB