Analysis

  • max time kernel
    148s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20240903-en
  • resource tags

    arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
  • submitted
    05/11/2024, 15:18

General

  • Target
    7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf.exe
  • Size 925KB
  • Sample241105-spk97sspgv
  • SHA256 7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • 206.189.218.238:4782

  • 206.189.218.238:2286

  • 206.189.218.238:3363

  • 206.189.218.238:3386

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

    true

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-NJK093

  • screenshot_crypt

    false

  • screenshot_flag

    true

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    1

  • 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 3 IoCs

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

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 1 IoCs

    Password recovery tool for various web browsers

  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Executes dropped EXE 6 IoCs
  • Loads dropped DLL 1 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 4 IoCs
  • Suspicious use of SetThreadContext 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 11 IoCs

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

  • Scheduled Task/Job: Scheduled Task 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: MapViewOfSection 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf.exe
    "C:\Users\Admin\AppData\Local\Temp\7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2872
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\HOfyiGfs.exe"
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2084
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HOfyiGfs" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDC89.tmp"
      2⤵
      • System Location Discovery: System Language Discovery
      • Scheduled Task/Job: Scheduled Task
      PID:2044
    • C:\Users\Admin\AppData\Local\Temp\7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf.exe
      "C:\Users\Admin\AppData\Local\Temp\7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf.exe"
      2⤵
      • Loads dropped DLL
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2948
      • C:\ProgramData\Remcos\remcos.exe
        "C:\ProgramData\Remcos\remcos.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2600
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\HOfyiGfs.exe"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2892
        • C:\Windows\SysWOW64\schtasks.exe
          "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HOfyiGfs" /XML "C:\Users\Admin\AppData\Local\Temp\tmp3488.tmp"
          4⤵
          • System Location Discovery: System Language Discovery
          • Scheduled Task/Job: Scheduled Task
          PID:1568
        • C:\ProgramData\Remcos\remcos.exe
          "C:\ProgramData\Remcos\remcos.exe"
          4⤵
          • Executes dropped EXE
          PID:1744
        • C:\ProgramData\Remcos\remcos.exe
          "C:\ProgramData\Remcos\remcos.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 SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:2040
          • C:\ProgramData\Remcos\remcos.exe
            C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\wxkrrcsrtzbxxi"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious behavior: EnumeratesProcesses
            PID:2544
          • C:\ProgramData\Remcos\remcos.exe
            C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\zrxkrudkphtcaoyjq"
            5⤵
            • Executes dropped EXE
            • Accesses Microsoft Outlook accounts
            • System Location Discovery: System Language Discovery
            PID:796
          • C:\ProgramData\Remcos\remcos.exe
            C:\ProgramData\Remcos\remcos.exe /stext "C:\Users\Admin\AppData\Local\Temp\jtdckfnmdplhkcmnazts"
            5⤵
            • Executes dropped EXE
            • System Location Discovery: System Language Discovery
            • Suspicious use of AdjustPrivilegeToken
            PID:2236

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        logs.dat

        • Path C:\ProgramData\Remcos\logs.dat
        • Size 144B
        • SHA256 b1f1437150428c98624745ad5472747e3d46f4644beb31afca1ef0861f09afe2
        • MD5 SHA1 SHA512

        remcos.exe

        • Path C:\ProgramData\Remcos\remcos.exe
        • Size 925KB
        • SHA256 7fef9fc48835f5ad1c726a78a1feac7e7f9049267155bb452a476af6d2694fbf
        • MD5 SHA1 SHA512 SSDEEP

        tmpDC89.tmp

        • Path C:\Users\Admin\AppData\Local\Temp\tmpDC89.tmp
        • Size 1KB
        • SHA256 6ca51efbe1369868ed688cd8b6f48a304b709bbf3f870a596618fa7ffaf10e87
        • MD5 SHA1 SHA512

        wxkrrcsrtzbxxi

        • Path C:\Users\Admin\AppData\Local\Temp\wxkrrcsrtzbxxi
        • Size 2B
        • SHA256 b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209
        • MD5 SHA1 SHA512

        CZXOKXWFDQFGFQ4QQWFY.temp

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\CZXOKXWFDQFGFQ4QQWFY.temp
        • Size 7KB
        • SHA256 66971b232db7688861ec923ddc02a041d6c23c666cc9c5029b3a0c13a6f68774
        • MD5 SHA1 SHA512 SSDEEP

        d93f411851d7c929.customDestinations-ms

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
        • Size 7KB
        • SHA256 22cf2cd1e9768404948ce6d89d6a46fe205902bb438cb3178b19df1d3bc147db
        • MD5 SHA1 SHA512 SSDEEP

        memory/796-91-0x0000000000400000-0x0000000000462000-memory.dmp

        memory/796-88-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/796-89-0x0000000000400000-0x0000000000462000-memory.dmp

        memory/796-98-0x0000000000400000-0x0000000000462000-memory.dmp

        memory/2040-70-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-69-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-107-0x0000000010000000-0x0000000010019000-memory.dmp

        memory/2040-106-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-105-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-82-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-79-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-80-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-77-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-78-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-60-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2040-63-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2040-64-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2236-97-0x0000000000400000-0x0000000000424000-memory.dmp

        memory/2236-94-0x0000000000400000-0x0000000000424000-memory.dmp

        memory/2236-96-0x0000000000400000-0x0000000000424000-memory.dmp

        memory/2544-84-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2544-85-0x0000000000400000-0x0000000000478000-memory.dmp

        memory/2544-92-0x0000000000400000-0x0000000000478000-memory.dmp

        memory/2544-87-0x0000000000400000-0x0000000000478000-memory.dmp

        memory/2600-39-0x0000000000A10000-0x0000000000AFE000-memory.dmp

        memory/2872-5-0x0000000074520000-0x0000000074C0E000-memory.dmp

        memory/2872-3-0x0000000000550000-0x000000000056E000-memory.dmp

        memory/2872-1-0x0000000001230000-0x000000000131E000-memory.dmp

        memory/2872-6-0x0000000005D80000-0x0000000005E40000-memory.dmp

        memory/2872-32-0x0000000074520000-0x0000000074C0E000-memory.dmp

        memory/2872-0-0x000000007452E000-0x000000007452F000-memory.dmp

        memory/2872-4-0x000000007452E000-0x000000007452F000-memory.dmp

        memory/2872-2-0x0000000074520000-0x0000000074C0E000-memory.dmp

        memory/2948-24-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-14-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-18-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-12-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-30-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-29-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-28-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

        memory/2948-20-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-22-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-26-0x0000000000400000-0x0000000000482000-memory.dmp

        memory/2948-16-0x0000000000400000-0x0000000000482000-memory.dmp