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تروجان، برنامه مخربی است که به صورت یک نرم افزار جالب به نظر می‌رسد .بر عکس ویروس‌ها، تروجان‌ها تکثیر نمی شوند؛ ولی به‌‌ اندازۀ ویروس ها مخرب هستند. یکی از انواع تروجان‌ها، برنامه‌ای است که ادعا می‌کند، کامپیو‌تر شما را از شر ویروس‌ها نجات می‌دهد؛ اما در حقیقت ویروس‌ها را با سیستم شما آشنا و به آنها معرفی می‌کنند.

لغت تروجان برگرفته از افسانۀ یونانی جنگ تروجان است. در این داستان یونانی‌ها از طریق هدیه دادن اسب چوبی بزرگی به دشمنانشان، تعدادی سرباز به قلعۀ آن‌ها فرستادند؛ سپس این سرباز‌ها از داخل اسب بیرون آمده و درب قلعه را باز کردند تا دیگر افراد به داخل قلعه بیایند و قلعه را فتح کنند. این مثال دقیقاً عملی است که تروجان با کامپیو‌تر شما انجام می‌دهد. تروجان ابتدا به قسمت های مختلف نفوذ می‌کند؛ سپس، راهی برای آسیب به آنها پیدا خواهد کرد.

در زیر برخی از انواع تروجان و عملکرد آن‌ها را به اختصار بیان می‌کنیم:

تروجان کنترل دسترسی:

یک تروجان کنترل دسترسی(RTA )، برای فراهم کردن دسترسی مهاجمان به کنترل کامل سیستم کامپیوتر قربانی، طراحی شده است. مهاجمان اغلب این نوع تروجان را در بازی‌ها و برنامه‌های کوچک قرار می‌دهند تا هیچ کاربری به آن مشکوک نشود؛ سپس از آن طریق، کامپیو‌تر شخص را مورد تهاجم قرار می‌دهند.

 

تروجان مخرب:

این نوع از تروجان ها برای تخریب و حذف فایل‌ها طراحی شده‌اند و از این جهت بسیار شبیه به ویروس‌ها هستند. آن‌ها اغلب با نرم افزارهای آنتی ویروس قابل ردیابی نیستند.

 تروجان‌های پروکسی:

این نوع از تروجان‌ها برای تخریب برنامه های کامپیوتر قربانی، به عنوان پروکسی سرور، طراحی شده‌اند. ورود تروجان ها از این طریق اجازۀ هر عملی را در کامپیو‌تر شما، به مهاجمان می‌دهد، از جمله: کلاهبرداری از کارت های اعتباری و فعالیت های غیر قانونی و حتی استفاده از کامپیو‌تر شما برای فرستادن حمله‌های خطرناک به دیگر کامپیوترهای شبکه.

تروجان‌های: FTP

این تروجان‌ها پورت ۲۱ (پورت ارسال اطلاعات) کامپیو‌تر شما را باز می گذارند و به مهاجمان اجازه اتصال به کامپیو‌تر شما و استفاده از FTP  (پروتکل ارسال اطلاعات) را می‌دهند.

 

تروجان مخرب نرم افزارهای امنیتی:

این تروجان‌ها، نرم افزار امنیتی کامپیو‌تر، مانند آنتی ویروس‌ها یا دیوارهای آتش‌ را بدون اینکه شما متوجه شوید، متوقف می‌کنند یا از بین می‌برند. این نوع از تروجان؛ اغلب با دیگر انواع تروجان ترکیب می‌شوند و آثار بسیار مخربی دارند.

با این تفاسیر متوجه می‌شویم که افشای اطلاعات ما می‌تواند به راحتی از طریق دانلود یک بازی یا یک برنامه، بدون اینکه حتی متوجه شویم، صورت پذیرد؛ پس سعی کنیم با دقت هر چه بیشتر امنیت کامپیو‌تر و اطلاعات شخصی خود را حفظ کنیم.

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