Analysis

  • max time kernel
    122s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    30-11-2023 17:55

General

  • Target

    Remcos v4.9.3 Pro.exe

  • Size

    467KB

  • MD5

    ccb5f97be3daefc9cdeaff2aec1ad323

  • SHA1

    3b561e66a88eb6072a363c1b9cc52d0a679c20e6

  • SHA256

    f7284ed876aebbf3407d50fd6acdbd11adb75c31550c3034c1600f4eb4e61043

  • SHA512

    c6716462e91b02b561ebe89418c3a36eea7dea6924ff6483cef6c834512123258706924cb8ec07040325522d41fe329659758b01f69bf6a17805599344f01180

  • SSDEEP

    6144:sXIktXfM8Lv86r9uVWAa2je4Z5zl4hgDHQQs4NTQjoHFsAOZZsAX4cNF5Gv:sX7tPMK8ctGe4Dzl4h2QnuPs/Zs0cv

Malware Config

Extracted

Family

remcos

Botnet

nulled

C2

essagbs.ddns.net:2404

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    svhost.exe

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %WinDir%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    logs

  • mouse_option

    false

  • mutex

    ewaewefsefsefdseadwadf-21RLZF

  • 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.

  • UAC bypass 3 TTPs 3 IoCs
  • Adds policy Run key to start application 2 TTPs 6 IoCs
  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 6 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Windows directory 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry key 1 TTPs 3 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 42 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Remcos v4.9.3 Pro.exe
    "C:\Users\Admin\AppData\Local\Temp\Remcos v4.9.3 Pro.exe"
    1⤵
    • Adds policy Run key to start application
    • Adds Run key to start application
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:2040
    • C:\Windows\SysWOW64\cmd.exe
      /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2116
      • C:\Windows\SysWOW64\reg.exe
        C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        3⤵
        • UAC bypass
        • Modifies registry key
        PID:2900
    • C:\Windows\svhost.exe
      "C:\Windows\svhost.exe"
      2⤵
      • Adds policy Run key to start application
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:3056
      • C:\Windows\SysWOW64\cmd.exe
        /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2088
        • C:\Windows\SysWOW64\reg.exe
          C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
          4⤵
          • UAC bypass
          • Modifies registry key
          PID:2612
      • \??\c:\program files (x86)\internet explorer\iexplore.exe
        "c:\program files (x86)\internet explorer\iexplore.exe"
        3⤵
        • Adds policy Run key to start application
        • Adds Run key to start application
        • Suspicious use of SetThreadContext
        • Drops file in Windows directory
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:616
        • C:\Windows\SysWOW64\cmd.exe
          /k %windir%\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2720
          • C:\Windows\SysWOW64\reg.exe
            C:\Windows\System32\reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
            5⤵
            • UAC bypass
            • Modifies registry key
            PID:2992
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          4⤵
            PID:2324
          • C:\Windows\SysWOW64\WScript.exe
            "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\tzwwqbukn.vbs"
            4⤵
              PID:1088

      Network

      MITRE ATT&CK Matrix ATT&CK v13

      Persistence

      Boot or Logon Autostart Execution

      2
      T1547

      Registry Run Keys / Startup Folder

      2
      T1547.001

      Privilege Escalation

      Abuse Elevation Control Mechanism

      1
      T1548

      Bypass User Account Control

      1
      T1548.002

      Boot or Logon Autostart Execution

      2
      T1547

      Registry Run Keys / Startup Folder

      2
      T1547.001

      Defense Evasion

      Abuse Elevation Control Mechanism

      1
      T1548

      Bypass User Account Control

      1
      T1548.002

      Impair Defenses

      1
      T1562

      Disable or Modify Tools

      1
      T1562.001

      Modify Registry

      4
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\ProgramData\logs\logs.dat
        Filesize

        144B

        MD5

        d2e33ffe5bc444099a579c4460b730cf

        SHA1

        d0c39337d1402438616be8915f4421148f4c60f6

        SHA256

        5b7b158297f985b3836870d4890cdd38be085dca02ad4248fbc13a2a3ba2be61

        SHA512

        14dc3736d453a0bcec8675ce0f0eab2fdbf830a6952c40906c4b7f5eef5f66ffb6a2dc060c6f0924c6d5c1e0111e6dfff47d9d148377c5eea805205ed2ccc40c

      • C:\Users\Admin\AppData\Local\Temp\tzwwqbukn.vbs
        Filesize

        404B

        MD5

        add5c07ccccb47a55d146baefa26ae14

        SHA1

        f4f673a17ff2d1ccf91ba8fab00c07869c07f1e7

        SHA256

        3c57ff2c305b8048ce2569a62fe40c600c891a81cece9ee42f2f8310c0a83518

        SHA512

        9786c6f0d60de49a417a194e77859427517a6819f450676a303226f793f108ae4f8345cfd2cb94ecd5a204d6592a81325c7d80a7a08b318a922621495ffa9261

      • C:\Windows\svhost.exe
        Filesize

        467KB

        MD5

        ccb5f97be3daefc9cdeaff2aec1ad323

        SHA1

        3b561e66a88eb6072a363c1b9cc52d0a679c20e6

        SHA256

        f7284ed876aebbf3407d50fd6acdbd11adb75c31550c3034c1600f4eb4e61043

        SHA512

        c6716462e91b02b561ebe89418c3a36eea7dea6924ff6483cef6c834512123258706924cb8ec07040325522d41fe329659758b01f69bf6a17805599344f01180

      • C:\Windows\svhost.exe
        Filesize

        467KB

        MD5

        ccb5f97be3daefc9cdeaff2aec1ad323

        SHA1

        3b561e66a88eb6072a363c1b9cc52d0a679c20e6

        SHA256

        f7284ed876aebbf3407d50fd6acdbd11adb75c31550c3034c1600f4eb4e61043

        SHA512

        c6716462e91b02b561ebe89418c3a36eea7dea6924ff6483cef6c834512123258706924cb8ec07040325522d41fe329659758b01f69bf6a17805599344f01180

      • C:\Windows\svhost.exe
        Filesize

        467KB

        MD5

        ccb5f97be3daefc9cdeaff2aec1ad323

        SHA1

        3b561e66a88eb6072a363c1b9cc52d0a679c20e6

        SHA256

        f7284ed876aebbf3407d50fd6acdbd11adb75c31550c3034c1600f4eb4e61043

        SHA512

        c6716462e91b02b561ebe89418c3a36eea7dea6924ff6483cef6c834512123258706924cb8ec07040325522d41fe329659758b01f69bf6a17805599344f01180

      • memory/616-28-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-34-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-14-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-16-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-17-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-19-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-18-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-8-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB

      • memory/616-24-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-56-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-27-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-12-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-29-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-32-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-33-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-13-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-35-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-37-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-38-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-42-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-43-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-44-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-10-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-47-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-49-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-50-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/616-51-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/2324-26-0x0000000000130000-0x00000000001AE000-memory.dmp
        Filesize

        504KB

      • memory/2324-20-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
        Filesize

        4KB