{"id":37347,"date":"2016-07-10T16:24:58","date_gmt":"2016-07-10T14:24:58","guid":{"rendered":"http:\/\/www.tele-pc.es\/?p=1130"},"modified":"2024-05-07T18:23:54","modified_gmt":"2024-05-07T16:23:54","slug":"prevencion-profesional-del-virus-cryptolocker","status":"publish","type":"post","link":"https:\/\/promocionalia.es\/web\/prevencion-profesional-del-virus-cryptolocker\/","title":{"rendered":"Prevenci\u00f3n profesional del virus Cryptolocker"},"content":{"rendered":"<h3 class=\"post-title entry-title\">Windows: GPO para prevenir Cryptolocker<\/h3>\n<div class=\"post-header\"><\/div>\n<div id=\"post-body-1676118294581495492\" class=\"post-body entry-content\">\n<div>Algunas medidas que puede tomar el administrador de sistemas para prevenir incidentes relacionados con Cryptolocker son:<\/div>\n<ul>\n<li>Formar a los usuarios (o intentarlo :-)).<\/li>\n<li>Disponer de un sistema de backups que permitan una restauraci\u00f3n r\u00e1pida de los ficheros afectados.<\/li>\n<li>Configurar las instant\u00e1neas de volumen en los servidores de ficheros, ya que nos permitir\u00e1n una restauraci\u00f3n m\u00e1s r\u00e1pida.<\/li>\n<li>Repasar los recursos compartidos y permisos NTFS a los que puede acceder cada usuario: La idea es que en caso de infecci\u00f3n, minimizar el n\u00famero de ficheros encriptados.<\/li>\n<li>Verificar antivirus de scan en tiempo real, en todos los equipos: configuraci\u00f3n, actualizaci\u00f3n de firmas y motor.<\/li>\n<li>Mejorar\/verificar el filtrado de contenido web.<\/li>\n<li>Mejorar\/verificar el filtrado de correo electr\u00f3nico.<\/li>\n<\/ul>\n<div>Adem\u00e1s de lo anterior, como medida adicional, podemos utilizar GPOs para fortificar la configuraci\u00f3n e intentar evitar la ejecuci\u00f3n de Cryptolockers.<\/div>\n<div><\/div>\n<div>Para ello, utilizaremos las Software Restriction Policies (SRP).<\/div>\n<div><\/div>\n<div>Encontraremos la posibilidad de configurar directivas SRP como GPOs de equipo o usuario:<\/div>\n<div><\/div>\n<div><\/div>\n<div class=\"separator\"><a href=\"http:\/\/1.bp.blogspot.com\/-H3k_dhKYifg\/VTYjrHdsKxI\/AAAAAAAAB0g\/0bSiGNN73yY\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-03.png\"><img fetchpriority=\"high\" decoding=\"async\" title=\"\" src=\"http:\/\/1.bp.blogspot.com\/-H3k_dhKYifg\/VTYjrHdsKxI\/AAAAAAAAB0g\/0bSiGNN73yY\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-03.png\" alt=\"Vista GPMC\" width=\"376\" height=\"640\" border=\"0\" \/><\/a><\/div>\n<div class=\"separator\"><\/div>\n<div class=\"separator\"><\/div>\n<div><\/div>\n<div>Un ejemplo de uso de GPO basada en SRP lo podemos encontrar en el siguiente enlace:<\/div>\n<div><\/div>\n<div><a href=\"http:\/\/www.sysadmit.com\/2014\/05\/GPO-Deshabilitar-el-uso-de-Internet-Explorer-sobre-Windows-XP.html\">GPO: Deshabilitar el uso de Internet Explorer sobre Windows XP (SYSADMIT.com)<\/a><\/div>\n<div><\/div>\n<div>En nuestro caso, no podemos prevenir la ejecuci\u00f3n del Cryptolocker con una GPO SRP basada en hash, hasta que no dispongamos de un fichero EXE del virus del\u00a0Cryptolocker para obtener su hash.<\/div>\n<div><\/div>\n<div>\n<p>Sin embargo, podemos configurar GPOs SRP que bloqueen extensiones en rutas.<\/p>\n<p>Una GPO SRP de bloqueo de rutas, el bloqueo se efectuar\u00e1 independientemente de los permisos NTFS asignados en la ruta.<\/p>\n<\/div>\n<div><\/div>\n<div>Deberemos personalizar la GPO con las exclusiones necesarias seg\u00fan nuestro entorno: aplicaciones instaladas, sistema operativo, descompresor utilizado, etc.<\/div>\n<div><\/div>\n<div>Ejemplo:<\/div>\n<div><\/div>\n<div><b>Vista completa de la GPO SRP texto:<\/b><\/div>\n<div><\/div>\n<div>\n<p>User Configuration (Enabled) &gt; Policies &gt; Windows Settings &gt; Security &gt; Settings &gt; Software Restriction Policies<\/p>\n<p><u>Enforcement<\/u><\/p>\n<p>Apply software restriction policies to the following:\u00a0 <i>All software files except libraries (such as DLLs) <\/i><br \/>\nApply software restriction policies to the following users: <i>All users <\/i><br \/>\nWhen applying software restriction policies: <i>Ignore certificate rules <\/i><\/p>\n<p><u>Designated File Types<\/u><\/p>\n<pre>ADE ADE File\r\nADP ADP File\r\nBAS BAS File\r\nBAT Windows Batch File\r\nCHM Compiled HTML Help file\r\nCMD Windows Command Script\r\nCOM MS-DOS Application\r\nCPL Control panel item\r\nCRT Security Certificate\r\nEXE Application\r\nHLP Help file\r\nHTA HTML Application\r\nINF Setup Information\r\nINS INS File\r\nISP ISP File\r\nLNK Shortcut\r\nMDB MDB File\r\nMDE MDE File\r\nMSC Microsoft Common Console Document\r\nMSI Windows Installer Package\r\nMSP Windows Installer Patch\r\nMST MST File\r\nOCX ActiveX control\r\nPCD PCD File\r\nPIF Shortcut to MS-DOS Program\r\nREG Registration Entries\r\nSCR Screen saver\r\nSHS SHS File\r\nURL Internet Shortcut\r\nVB\u00a0 VB File\r\nWSC Windows Script Component<\/pre>\n<p>Trusted publisher management: <i>Allow all administrators and users to manage user&#8217;s own Trusted Publishers<\/i><\/p>\n<p>Certificate verification: <i>None<\/i><\/p>\n<p>Software Restriction Policies\/Security Level<\/p>\n<p>Default Security Level: <i>Unrestricted<\/i><\/p>\n<p>Software Restriction Policies\/Additional Rules<\/p>\n<p><u>Path Rules<\/u><\/p>\n<p>Disallowed:<\/p>\n<pre>%AppData%\r\n%AppData%*\r\n%localappdata%\r\n%localappdata%*\r\n%localappdata%MicrosoftWindowsTemporary Internet Files\r\n%localappdata%MicrosoftWindowsTemporary Internet FilesContent.Outlook\r\n%localappdata%MicrosoftWindowsTemporary Internet FilesContent.Outlook*\r\n%localappdata%MicrosoftWindowsTemporary Internet FilesContent.Outlook**\r\n%Temp%\r\n%Temp%$*\r\n%Temp%*.zip\r\n%userprofile%<\/pre>\n<p>Unrestricted: (ejemplo de proceso que si se desea que se ejecute)<\/p>\n<pre>%Temp%Procmon64.exe\r\n%localappdata%*Procmon64.exe\r\n%HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionSystemRoot%\r\n%HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionProgramFilesDir%<\/pre>\n<\/div>\n<div><\/div>\n<div><b>Vista parcial de la GPO SRP imagen:<\/b><\/div>\n<div><\/div>\n<div class=\"separator\"><a href=\"http:\/\/3.bp.blogspot.com\/-Yq-dRjB4OQc\/VTYciqfSm3I\/AAAAAAAAB0I\/A8pSd-cVUw4\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-01.png\"><img decoding=\"async\" title=\"\" src=\"http:\/\/3.bp.blogspot.com\/-Yq-dRjB4OQc\/VTYciqfSm3I\/AAAAAAAAB0I\/A8pSd-cVUw4\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-01.png\" alt=\"HTML de la GPMC, parte 1\" width=\"640\" height=\"284\" border=\"0\" \/><\/a><\/div>\n<div><\/div>\n<div class=\"separator\"><a href=\"http:\/\/4.bp.blogspot.com\/-C8fV36s1Zl0\/VTYdBBZ8HAI\/AAAAAAAAB0Q\/Gxs20Ix7Wig\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-02.png\"><img decoding=\"async\" title=\"\" src=\"http:\/\/4.bp.blogspot.com\/-C8fV36s1Zl0\/VTYdBBZ8HAI\/AAAAAAAAB0Q\/Gxs20Ix7Wig\/s1600\/windows-gpo-prevenir-cryptolocker-sysadmit-02.png\" alt=\"HTML de la GPMC, parte 2\" width=\"640\" height=\"338\" border=\"0\" \/><\/a><\/div>\n<div><\/div>\n<div>Para completar nuestra GPO SRP, podemos utilizar el siguiente recurso:<\/div>\n<div><\/div>\n<div><a href=\"http:\/\/www.thirdtier.net\/2013\/10\/cryptolocker-prevention-kit\/\" rel=\"nofollow\">Cryptolocker Prevention Kit (thirdtier.net)<\/a><\/div>\n<\/div>\n<div><\/div>\n<div>Fuente:\u00a0http:\/\/www.sysadmit.com\/<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Windows: GPO para prevenir Cryptolocker Algunas medidas que puede tomar el administrador de sistemas para&hellip;<\/p>\n","protected":false},"author":2,"featured_media":37348,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rs_blank_template":"","rs_page_bg_color":"","slide_template_v7":"","footnotes":""},"categories":[1],"tags":[269,266,268,267],"class_list":["post-37347","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sin-categoria","tag-correos","tag-cryptolocker","tag-endesa","tag-virus"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Prevenci\u00f3n profesional del virus Cryptolocker - PROMOCIONALIA<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Prevenci\u00f3n 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