{"id":158,"date":"2025-07-31T16:01:13","date_gmt":"2025-07-31T14:01:13","guid":{"rendered":"https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/2025\/07\/31\/421-virus\/"},"modified":"2026-01-18T11:14:54","modified_gmt":"2026-01-18T10:14:54","slug":"421-virus","status":"publish","type":"post","link":"https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/?p=158","title":{"rendered":"4#21 : Virus, hygi\u00e8ne num\u00e9rique"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Virus, quels types ?<br>Les vecteurs de propagation, comment se prot\u00e9ger ?<\/h2>\n\n\n<p><iframe loading=\"lazy\" width=\"100%\" height=\"auto\" style=\"aspect-ratio:16\/9;\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/TXLaFmgMHn8?playlist=TXLaFmgMHn8&#038;autoplay=0&#038;iv_load_policy=3&#038;loop=1&#038;start=0&#038;modestbranding=1&#038;rel=0&#038;playsinline=1&#038;controls=1&#038;end=55&#038;enablejsapi=1&#038;origin=https%3A%2F%2Ftourneurstephane.forge.apps.education.fr\" frameborder=\"0\" allow=\"accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n\n\n\n<p>Dans ce cas, il est d\u00e9j\u00e0 trop tard&#8230;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Un virus pas toujours visible mais tr\u00e8s nuisible&#8230; Comment v\u00e9rifier ?<\/h2>\n\n\n\n<p>L&rsquo;antivirus peut vous accompagner pour identifier et \u00e9liminer une menace. Windows est \u00e9quip\u00e9 d&rsquo;un outil de suppression des logiciels malveillants :<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"888\" src=\"https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/wp-content\/uploads\/sites\/3\/2025\/11\/antivirus-windows-1024x888.jpg\" alt=\"mrt\" class=\"wp-image-755\" srcset=\"https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/wp-content\/uploads\/sites\/3\/2025\/11\/antivirus-windows-1024x888.jpg 1024w, https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/wp-content\/uploads\/sites\/3\/2025\/11\/antivirus-windows-300x260.jpg 300w, https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/wp-content\/uploads\/sites\/3\/2025\/11\/antivirus-windows-768x666.jpg 768w, https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/wp-content\/uploads\/sites\/3\/2025\/11\/antivirus-windows.jpg 1177w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Vaut mieux pr\u00e9venir que gu\u00e9rir : \u00e9vitons les virus&#8230;<\/h2>\n\n\n\n<p>D&rsquo;o\u00f9 viennent les virus ? Comment peut-on les endiguer ? Par quels stratag\u00e8mes les pirates infiltrent-ils certains r\u00e9seaux ? D&rsquo;o\u00f9 viennent ces spam qui inondent nos \u00e9crans de publicit\u00e9s ? Comment les paiements en ligne sont-ils s\u00e9curis\u00e9s ? Et pourquoi cette s\u00e9curisation ne suffit-elle pas toujours ?<\/p>\n\n\n\n<p><strong>La confiance&#8230; premier vecteur de diffusion des virus<\/strong>&#8230;<br><strong>Faux site avec de vrais virus (attention il y a de vrai virus)<\/strong> : <a href=\"https:\/\/www.toshiba-drivers.com\/download_toshiba_drivers_free\/thws-20070919162134.zip-f-265.html\">https:\/\/www.toshiba-drivers.com\/download_toshiba_drivers_free\/thws-20070919162134.zip-f-265.html<\/a><\/p>\n\n\n<p><iframe width=\"100%\" height=\"auto\" style=\"aspect-ratio:16\/9;\"src=\"https:\/\/www.youtube-nocookie.com\/embed\/kqf5VUo541c?playlist=kqf5VUo541c&#038;autoplay=0&#038;iv_load_policy=3&#038;loop=1&#038;start=0&#038;modestbranding=1&#038;rel=0&#038;playsinline=1&#038;controls=1&#038;end=1571&#038;enablejsapi=1&#038;origin=https%3A%2F%2Ftourneurstephane.forge.apps.education.fr\" frameborder=\"0\" allow=\"accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les gestes simples et efficaces<\/h2>\n\n\n\n<p>Sauvegardez vos donn\u00e9es !<\/p>\n\n\n<p><iframe loading=\"lazy\" width=\"100%\" height=\"auto\" style=\"aspect-ratio:16\/9;\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/kOAdEKU86nI?playlist=kOAdEKU86nI&#038;autoplay=0&#038;iv_load_policy=3&#038;loop=1&#038;start=0&#038;modestbranding=1&#038;rel=0&#038;playsinline=1&#038;controls=1&#038;end=53&#038;enablejsapi=1&#038;origin=https%3A%2F%2Ftourneurstephane.forge.apps.education.fr\" frameborder=\"0\" allow=\"accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n\n\n\n<p>Double authentification : renforcez vos acc\u00e8s !<\/p>\n\n\n<p><iframe loading=\"lazy\" width=\"100%\" height=\"auto\" style=\"aspect-ratio:16\/9;\" src=\"https:\/\/www.youtube-nocookie.com\/embed\/4GQxevlvFG8?playlist=4GQxevlvFG8&#038;autoplay=0&#038;iv_load_policy=3&#038;loop=1&#038;start=0&#038;modestbranding=1&#038;rel=0&#038;playsinline=1&#038;controls=1&#038;end=138&#038;enablejsapi=1&#038;origin=https%3A%2F%2Ftourneurstephane.forge.apps.education.fr\" frameborder=\"0\" allow=\"accelerometer; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les diff\u00e9rentes menaces (vocabulaire)<\/h2>\n\n\n\n<p><strong>Programme malveillant<\/strong><br>Un Malware, ou programme malveillant, est le nom donn\u00e9 \u00e0 tout type de logiciel susceptible de nuire \u00e0<br>un syst\u00e8me informatique, d\u2019interf\u00e9rer avec les donn\u00e9es d\u2019un utilisateur et de les collecter ou de faire en<br>sorte que l\u2019ordinateur ex\u00e9cute des actions sans que le propri\u00e9taire de l\u2019ordinateur ne le sache ni ne<br>l\u2019autorise.<br><br><strong>Virus<\/strong><br>Un virus informatique est un logiciel qui peut \u00ab infecter \u00bb un ordinateur, s\u2019installer lui-m\u00eame et se copier sur d\u2019autres ordinateurs, sans que l\u2019utilisateur ne le sache ni ne l\u2019autorise. Il se lie g\u00e9n\u00e9ralement \u00e0 d\u2019autres programmes informatiques, ou fichiers de donn\u00e9es ou au secteur de d\u00e9marrage d\u2019un disque dur.<br><br><strong>Cheval de Troie<\/strong><br>Il s\u2019agit d\u2019un type de programme malveillant qui utilise un code pour installer un logiciel qui semble autoris\u00e9, mais qui est masqu\u00e9 pour cr\u00e9er des portes d\u00e9rob\u00e9es dans un syst\u00e8me, et qui entra\u00eene g\u00e9n\u00e9ralement la perte ou le vol de donn\u00e9es depuis une source externe.<br><br><strong>Ver<\/strong><br>Contrairement \u00e0 un virus, un ver est un logiciel malveillant autonome qui se r\u00e9plique afin de s\u2019\u00e9tendre \u00e0 d\u2019autres ordinateurs. Il utilise souvent un r\u00e9seau informatique pour se propager, en s\u2019appuyant sur les failles de s\u00e9curit\u00e9 du syst\u00e8me cible pour s\u2019autoriser l\u2019acc\u00e8s.<br><br><strong>Logiciel espion<\/strong><br>Les logiciels espions sont des logiciels qui permettent de collecter des informations sur une personne ou une organisation \u00e0 son insu. Ils peuvent surveiller et consigner les activit\u00e9s effectu\u00e9es sur un syst\u00e8me cible, notamment enregistrer les frappes ou collecter des informations de carte de cr\u00e9dit et d\u2019autres donn\u00e9es.<br><br><strong>Adware<\/strong><br>L\u2019Adware est un logiciel qui affiche automatiquement des publicit\u00e9s et des banni\u00e8res afin de g\u00e9n\u00e9rer des revenus pour son auteur ou son \u00e9diteur. Un grand nombre de logiciels gratuits utilisent des Adwares, mais pas toujours de fa\u00e7on malveillante. Lorsqu\u2019ils sont malveillants, ces logiciels sont class\u00e9s comme logiciels espions ou malveillants.<br><\/p>\n\n\n\n<p class=\"jeretiens\"><strong>Comment prot\u00e9ger un ordinateur contre les virus ?<\/strong><br>\u2022 R\u00e9fl\u00e9chissez avant de cliquer !<br>\u2022 Maintenez votre appareil \u00e0 jour.<br>\u2022 Je sauvegarde mes donn\u00e9es sur un support amovible ou distant.<br>\u2022 Installez un programme antivirus, maintenez-le \u00e0 jour et effectuez r\u00e9guli\u00e8rement des analyses.<br>\u2022 Installez un programme de protection contre les programmes malveillants pour emp\u00eacher l\u2019installation de logiciels \u00e0 votre insu.<br>\u2022 Ne t\u00e9l\u00e9chargez et n\u2019installez jamais de logiciels \u00e0 partir d\u2019Internet, sauf si vous \u00eates certains qu\u2019ils proviennent d\u2019une source de confiance.<br>\u2022 N\u2019ouvrez pas les pi\u00e8ces jointes des e-mails si vous ne les avez pas analys\u00e9es. M\u00eame une image peut contenir un virus.<br>\u2022 Ne faites pas confiance aux logiciels crack\u00e9s ou pirat\u00e9s, car ils contiennent souvent des logiciels malveillants et des chevaux de Troie<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Virus, quels types ?Les vecteurs de propagation, comment se prot\u00e9ger ? Dans ce cas, il est d\u00e9j\u00e0 trop tard&#8230; Un virus pas toujours visible mais tr\u00e8s nuisible&#8230; Comment v\u00e9rifier ? L&rsquo;antivirus peut vous accompagner pour identifier et \u00e9liminer une menace. Windows est \u00e9quip\u00e9 d&rsquo;un outil de suppression des logiciels malveillants : Vaut mieux pr\u00e9venir que [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":159,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[8],"tags":[6],"class_list":["post-158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-objets-et-les-systemes-techniques-leurs-usages-et-leurs-interactions-a-decouvrir-et-analyser","tag-4eme"],"acf":[],"mb":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>4#21 : Virus, hygi\u00e8ne num\u00e9rique - TECHNOLOGIE | 4\u00e8me CONTENU DE LA S\u00c9ANCE<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sciences-tec.fr\/cours\/cahierdetexte4\/?p=158\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"4#21 : Virus, hygi\u00e8ne num\u00e9rique - TECHNOLOGIE | 4\u00e8me CONTENU DE LA S\u00c9ANCE\" \/>\n<meta property=\"og:description\" content=\"Virus, quels types ?Les vecteurs de propagation, comment se prot\u00e9ger ? 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