Analysis

  • max time kernel
    149s
  • max time network
    161s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    04/07/2021, 06:55

General

  • Target
    b0da133665a2d0af6ac00040b1e872ce.exe
  • Size 823KB
  • Sample210704-hrvec5r41e
  • SHA256 eb55fdd4d15cf3d07905037073a275ba2697e8fdb2a9f60c0b16cf70969cd476
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • remcos

Version
  • 3.1.5 Pro

Botnet
  • chrome

C2
  • fieldsdegreenf.duckdns.org:6553

  • aaeeerbbbeee.duckdns.org:6553

  • sdegreenfieldsdeeenf.duckdns.org:6553

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

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • keylog_path

    %AppData%

  • mouse_option

    false

  • mutex

    Remcos-09G4NK

  • 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

  • Remcos

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

  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Suspicious use of SetThreadContext 9 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies Internet Explorer settings 1 TTPs 5 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 13 IoCs
  • Suspicious use of SetWindowsHookEx 10 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b0da133665a2d0af6ac00040b1e872ce.exe
    "C:\Users\Admin\AppData\Local\Temp\b0da133665a2d0af6ac00040b1e872ce.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3492
    • C:\Users\Admin\AppData\Local\Temp\b0da133665a2d0af6ac00040b1e872ce.exe
      "{path}"
      2⤵
        PID:1364
      • C:\Users\Admin\AppData\Local\Temp\b0da133665a2d0af6ac00040b1e872ce.exe
        "{path}"
        2⤵
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:2352
        • C:\Windows\SysWOW64\WScript.exe
          "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:2564
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe"
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1200
            • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
              C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:3748
              • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
                "{path}"
                6⤵
                • Executes dropped EXE
                PID:1508
              • C:\Users\Admin\AppData\Roaming\Remcos\remcos.exe
                "{path}"
                6⤵
                • Executes dropped EXE
                • Adds Run key to start application
                • Suspicious use of SetThreadContext
                • Suspicious behavior: GetForegroundWindowSpam
                • Suspicious use of SetWindowsHookEx
                • Suspicious use of WriteProcessMemory
                PID:1440
                • C:\Windows\SysWOW64\svchost.exe
                  C:\Windows\SysWOW64\svchost.exe
                  7⤵
                    PID:2260
                  • C:\Windows\SysWOW64\svchost.exe
                    C:\Windows\SysWOW64\svchost.exe
                    7⤵
                      PID:880
                    • C:\Windows\SysWOW64\svchost.exe
                      C:\Windows\SysWOW64\svchost.exe
                      7⤵
                        PID:1500
                      • C:\Windows\SysWOW64\svchost.exe
                        C:\Windows\SysWOW64\svchost.exe
                        7⤵
                          PID:4296
                        • C:\Windows\SysWOW64\svchost.exe
                          C:\Windows\SysWOW64\svchost.exe
                          7⤵
                            PID:2644
                          • C:\Windows\SysWOW64\svchost.exe
                            C:\Windows\SysWOW64\svchost.exe
                            7⤵
                              PID:4252
                            • C:\Windows\SysWOW64\svchost.exe
                              C:\Windows\SysWOW64\svchost.exe
                              7⤵
                                PID:5048
                              • C:\Windows\SysWOW64\svchost.exe
                                C:\Windows\SysWOW64\svchost.exe
                                7⤵
                                  PID:4540
                                • C:\Windows\SysWOW64\svchost.exe
                                  C:\Windows\SysWOW64\svchost.exe
                                  7⤵
                                    PID:4556
                                  • C:\Windows\SysWOW64\svchost.exe
                                    C:\Windows\SysWOW64\svchost.exe
                                    7⤵
                                      PID:388
                                    • C:\Windows\SysWOW64\svchost.exe
                                      C:\Windows\SysWOW64\svchost.exe
                                      7⤵
                                        PID:5484
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe" -ServerName:MicrosoftEdge.AppXdnhjhccw3zf0j06tkg3jtqr00qdm0khc.mca
                            1⤵
                            • Drops file in Windows directory
                            • Modifies Internet Explorer settings
                            • Modifies registry class
                            • Suspicious use of AdjustPrivilegeToken
                            • Suspicious use of SetWindowsHookEx
                            PID:3996
                          • C:\Windows\system32\browser_broker.exe
                            C:\Windows\system32\browser_broker.exe -Embedding
                            1⤵
                            • Modifies Internet Explorer settings
                            PID:3464
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Suspicious behavior: MapViewOfSection
                            • Suspicious use of SetWindowsHookEx
                            PID:1496
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies Internet Explorer settings
                            • Modifies registry class
                            • Suspicious use of AdjustPrivilegeToken
                            PID:2020
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:3748
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            • Suspicious use of AdjustPrivilegeToken
                            PID:4280
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe" -ServerName:MicrosoftEdge.AppXdnhjhccw3zf0j06tkg3jtqr00qdm0khc.mca
                            1⤵
                            • Drops file in Windows directory
                            • Modifies registry class
                            • Suspicious use of SetWindowsHookEx
                            PID:4456
                          • C:\Windows\system32\browser_broker.exe
                            C:\Windows\system32\browser_broker.exe -Embedding
                            1⤵
                            • Modifies Internet Explorer settings
                            PID:4524
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            • Suspicious behavior: MapViewOfSection
                            • Suspicious use of SetWindowsHookEx
                            • Suspicious use of WriteProcessMemory
                            PID:4712
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:4784
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdge.exe" -ServerName:MicrosoftEdge.AppXdnhjhccw3zf0j06tkg3jtqr00qdm0khc.mca
                            1⤵
                            • Drops file in Windows directory
                            • Modifies registry class
                            • Suspicious use of SetWindowsHookEx
                            PID:5116
                          • C:\Windows\system32\browser_broker.exe
                            C:\Windows\system32\browser_broker.exe -Embedding
                            1⤵
                            • Modifies Internet Explorer settings
                            PID:4316
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            • Suspicious behavior: MapViewOfSection
                            • Suspicious use of SetWindowsHookEx
                            PID:4420
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:956
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:3840
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:4896
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:5108
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:1100
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:4672
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:4656
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:1104
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:5272
                          • C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe
                            "C:\Windows\SystemApps\Microsoft.MicrosoftEdge_8wekyb3d8bbwe\MicrosoftEdgeCP.exe" -ServerName:ContentProcess.AppX6z3cwk4fvgady6zya12j1cw28d228a7k.mca
                            1⤵
                            • Modifies registry class
                            PID:5500

                          Network

                                MITRE ATT&CK Enterprise v6

                                Replay Monitor

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                                Downloads

                                memory/1440-151-0x0000000000400000-0x0000000000479000-memory.dmp

                                memory/2260-147-0x0000000000400000-0x00000000004D4000-memory.dmp

                                memory/2352-124-0x0000000000400000-0x0000000000479000-memory.dmp

                                memory/2352-127-0x0000000000400000-0x0000000000479000-memory.dmp

                                memory/3492-119-0x0000000004D40000-0x0000000004D41000-memory.dmp

                                memory/3492-114-0x0000000000420000-0x0000000000421000-memory.dmp

                                memory/3492-123-0x000000000B020000-0x000000000B0B6000-memory.dmp

                                memory/3492-122-0x0000000006AC0000-0x0000000006B8C000-memory.dmp

                                memory/3492-121-0x0000000008420000-0x0000000008421000-memory.dmp

                                memory/3492-120-0x0000000005810000-0x0000000005812000-memory.dmp

                                memory/3492-117-0x0000000004D50000-0x0000000004D51000-memory.dmp

                                memory/3492-118-0x0000000004CB0000-0x00000000051AE000-memory.dmp

                                memory/3492-116-0x00000000051B0000-0x00000000051B1000-memory.dmp

                                memory/3748-137-0x00000000048C0000-0x0000000004DBE000-memory.dmp