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Cryptovirology - Basics

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Une présentation très basique qui concerne uen nouvelle méthode de création de virus : la cryptovirologie

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Cryptovirology - Basics

  1. 1. R eda Boucid Master 2 – TIM Informatique & Multimédia 2007-2008 - Université de Nice Sophia Antipolis. Cryptovirologie Définition, attaques et contremesures
  2. 2. Cryptovirologie : Définition, attaques et contremesures <ul><li>PLAN </li></ul><ul><ul><ul><ul><li>Introduction </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Définition de la cryptovirologie </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Attaques cryptovirologiques </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Contremesures </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Conclusion </li></ul></ul></ul></ul>2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  3. 3. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> I ntroduction </li></ul></ul></ul></ul>Virologie : Science traitant le phénoméne des Virus informatiques. - Virus : Programme informatique implémentant des stratégies malicieuses pour prendre contrôle des ressources d'un système. - Vers : Virus + Reconnaisance de la structure du réseau, Propagation rapide via le réseau. - Virus 'blindés ' : Virus difficile à detécter et à debugger chiffrage dynamique, polymorphisme, Code Obsufcation... > Exemples de malware: My DoomXX, Code Red ( 360000 IIS server inféctés/24 h ) ‏ Nimda Worm, Curious Yellow, Cryptographie : Science pour protection des informations. 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  4. 4. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> Définition de la cryptovirologie </li></ul></ul></ul></ul>Objectif > Blindage des virus > Amélioration de la furtivité des virus > Developpement de la vitesse de propagation des vers au sein des réseaux étendus. - Fondateurs : Créateurs de Vers et Virus, chercheurs aux universités américaines. - Implémentation : Cryptography API (CAPI ) de Microsoft. Cryptographie Virologie Virologie Cryptovirologie + 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  5. 5. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> Outils Cryptovirologiques </li></ul></ul></ul></ul><ul><li>Source d'entropie : Générateur de nombre aléatoire RGN </li></ul><ul><li>Techniques utilisées : Génération environnementale. </li></ul><ul><li> </li></ul><ul><li> Extraction du du RN par hashage. </li></ul><ul><li>Cryptocounters : - Cryptodeclencheurs, Cryptodecompteurs </li></ul><ul><ul><ul><ul><ul><li>- Détérmine le moment exact du declechement de </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> de l'attaque virale. </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> - Valeur à décrementer à chaque infection, ou passage par un hôte. ( Cryptocompteur ) . </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> - Cryptocompteur : le compteur est chiffré </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li>Techniques utilisées : Algorithme asymétrique : RSA, El Gamal. </li></ul></ul></ul></ul></ul><ul><ul><ul><ul><ul><li> </li></ul></ul></ul></ul></ul>2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  6. 6. a,b,c, d Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>>A ttaques : Virus de Bradley </li></ul></ul></ul></ul>Environnement 1 1. Collecter et tester les éléments d'activation. V = H(H(a ʘ b ʘ c ʘ d) ʘµ) ‏ µ = 512 oct de EVP1 V=M' > K1 = H(aʘbʘcʘd) ‏ sinn > desinfect. 2 .Générer la clé K1 >Decrypter EVP1 VP1 = Dk1(EVP1) ‏ VP1 : anti-anti viral code 3. K2 = H(K1 ʘv2) v2 = 512 de VP1 >Decrypter EVP1 VP2 = Dk2(EVP2) ‏ VP2 : Code de contamination. + polymorphic engine!!! 4. K3 = H(K1ʘK2ʘv3) ‏ >Decrypter EVP3 VP3 = DK3(EVP3) ‏ VP3: partie supplémentaire. M' 2 3 4 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  7. 7. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>>A ttaques : Extortion d'information </li></ul></ul></ul></ul>D Virus de bradley. .RGN .Clé publique Kf Génération de la clé de session aléatoire ( RGN env ) Ks et IV D Chiffrage symétrique des données { D } - F Chiffrage de la clé Ks, IV et chksm par la clé public Kf : m'= Chiff Kf {Ks,IV,chksm} - Victime : Envoie du fichier F+ m' à l'auteur ' W' - W dechiffre m' par sa clé privée et le fichier F puis vérifie l'intégrité de F via le chksm.( h(F) = chksm) ‏ - W -> V la clé privée sinon .........!! Recherche du fichier désiré (F) ‏ Checksum de F, h(F) = chksm 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  8. 8. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> Contremesures : </li></ul></ul></ul></ul>- Pas grand chose pour le moment !!!! :=) - Contremesures préventives : Consultation des contenus cértifiés et sûrs - Mise a jour des systèmes informatiques et serveurs : pour éviter les attaques en exploit, patch. - Sécuriser ( cacher ) les données susceptibles d'êtres atteintes par le virus. - IDS : système de detéction d'intrusion : en developpment > Génération et propagation rapide des signatures virales > Automatisation des rapports et de l'audit. - Restrictions de l'utilisation des API de crypto pour une communauté professionelle et cértifiée ( pas au grand publique !) 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  9. 9. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> Conclusion </li></ul></ul></ul></ul>- La stratégie appliquée par la cryptovirologie est robuste - Resistance majeure à la cryptanalyse. - Favorise la propagation des vers et augmente la longévité d'un malware - Portabilité du principe : changer de platerforme ne tue pas le malware - Challenge pour les développeurs des antivirus 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  10. 10. Cryptovirologie : Définition, attaques et contremesures <ul><ul><ul><ul><li>> References </li></ul></ul></ul></ul>Ivan Balepin , ' superworms and cryptovirology : a deadly combination', 2004. Eric Filiol , ' Techniques virales avancées ' , Springer editions, 2007 Yung , Adam Young , 'Malicious Cryptography, Exposing Cryptovirology' , Wiley editions , 2006. Webographie : http:// www.cryptovirology.com / http:// www.rosiello.org/archivio/Next_Virus_Generation.ppt VideoGraphie : Adam Young , Experiments from Cryptovirology labs. 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid
  11. 11. Cryptovirologie : Définition, attaques et contremesures 2007-2008 - Université de nice Sophia Antipolis. Reda Boucid Merci Q&A

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