{"id":10279,"date":"2026-11-09T08:00:00","date_gmt":"2026-11-09T05:00:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10279"},"modified":"2026-11-09T08:00:00","modified_gmt":"2026-11-09T05:00:00","slug":"fidye-yazilimi-ransomware-nedir","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/fidye-yazilimi-ransomware-nedir\/","title":{"rendered":"Fidye Yaz\u0131l\u0131m\u0131 (Ransomware) Nedir?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Fidye yaz\u0131l\u0131m\u0131, bula\u015ft\u0131\u011f\u0131 sistemdeki dosyalar\u0131 g\u00fc\u00e7l\u00fc \u015fifreleme algoritmalar\u0131yla kilitleyerek eri\u015filemez hale getiren ve eri\u015fimi yeniden sa\u011flamak kar\u015f\u0131l\u0131\u011f\u0131nda kurbandan fidye talep eden bir zararl\u0131 yaz\u0131l\u0131m t\u00fcr\u00fcd\u00fcr. Bireysel kullan\u0131c\u0131lardan b\u00fcy\u00fck kurumsal a\u011flara kadar geni\u015f bir hedef kitlesine sahip olan bu tehdit, veriyi do\u011frudan \u00e7alman\u0131n \u00f6tesinde i\u015f s\u00fcreklili\u011fini durma noktas\u0131na getirir. Dijital varl\u0131klar\u0131n g\u00fcvenli\u011fini sa\u011flamak i\u00e7in fidye yaz\u0131l\u0131m\u0131 mant\u0131\u011f\u0131n\u0131 ve yay\u0131lma kanallar\u0131n\u0131 derinlemesine anlamak gerekir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fidye Yaz\u0131l\u0131m\u0131 Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fidye yaz\u0131l\u0131m\u0131 sald\u0131r\u0131lar\u0131 genellikle belirli a\u015famalardan olu\u015fan sistematik bir d\u00f6ng\u00fc izler. Sald\u0131rgan sistem i\u00e7ine s\u0131zd\u0131ktan sonra hemen \u015fifreleme ad\u0131m\u0131na ge\u00e7mez; \u00f6ncelikle a\u011f i\u00e7inde yatayda ilerleyerek (lateral movement) en kritik veri tabanlar\u0131n\u0131, yedek \u00fcnitelerini ve etki alan\u0131 denetleyicilerini (Domain Controller) tespit eder.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Bula\u015fma ve Yay\u0131lma Yollar\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Zararl\u0131 yaz\u0131l\u0131m\u0131n a\u011fa dahil olmas\u0131 \u00e7o\u011funlukla insan fakt\u00f6r\u00fc veya a\u00e7\u0131k servislerin istismar\u0131 ile ger\u00e7ekle\u015fir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Oltalama (Phishing) E-postalar\u0131: G\u00fcvenilir bir kurumdan gelmi\u015f gibi g\u00f6r\u00fcnen sahte fatura veya bildirim eklerindeki makro i\u00e7erikli ofis belgeleri.<\/li>\n\n<li>Savunmas\u0131z Servisler: \u0130nternete do\u011frudan a\u00e7\u0131k b\u0131rak\u0131lm\u0131\u015f ve zay\u0131f parolalara sahip Uzak Masa\u00fcst\u00fc Protokol\u00fc (RDP) portlar\u0131.<\/li>\n\n<li>Yaz\u0131l\u0131m A\u00e7\u0131klar\u0131: G\u00fcncellenmemi\u015f i\u015fletim sistemlerinde bulunan uzaktan kod y\u00fcr\u00fctme zafiyetleri.<\/li>\n\n<li>Zararl\u0131 \u0130ndirmeler: Sahte yaz\u0131l\u0131m g\u00fcncelleme bildirimleri veya korsan program dosyalar\u0131.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\u015eifreleme Mekanizmas\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Modern bir fidye yaz\u0131l\u0131m\u0131 hibrit \u015fifreleme mimarisi kullan\u0131r. Dosyalar\u0131n \u015fifrelenmesinde y\u00fcksek h\u0131z\u0131 nedeniyle simetrik \u015fifreleme algoritmalar\u0131 (\u00f6rne\u011fin AES-256) tercih edilir. Her dosya i\u00e7in benzersiz bir simetrik anahtar \u00fcretilir. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ard\u0131ndan bu simetrik anahtarlar, sald\u0131rgan\u0131n kontrol\u00fcndeki asimetrik bir genel anahtar (\u00f6rne\u011fin RSA-2048 veya RSA-4096) ile \u015fifrelenir. Asimetrik yap\u0131n\u0131n \u00f6zel anahtar\u0131 (private key) yaln\u0131zca sald\u0131rgan\u0131n komuta kontrol (C2) sunucusunda sakland\u0131\u011f\u0131ndan, \u00f6zel anahtar olmadan dosyalar\u0131n matematiksel olarak \u00e7\u00f6z\u00fclmesi imkans\u0131z hale gelir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Savunma ve Sistem S\u0131k\u0131la\u015ft\u0131rma i\u00e7in Teknik Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sistemleri fidye yaz\u0131l\u0131mlar\u0131na kar\u015f\u0131 diren\u00e7li k\u0131lmak i\u00e7in i\u015fletim sistemi d\u00fczeyinde baz\u0131 zafiyet i\u00e7eren protokollerin kapat\u0131lmas\u0131 ve kritik sistem servislerinin izlenmesi gerekir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Eski Protokollerin Devre D\u0131\u015f\u0131 B\u0131rak\u0131lmas\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Bir\u00e7ok fidye yaz\u0131l\u0131m\u0131 a\u011f i\u00e7inde h\u0131zla yay\u0131lmak i\u00e7in eski ve g\u00fcvensiz dosya payla\u015f\u0131m protokollerini istismar eder. Windows sistemlerde SMBv1 protokol\u00fcn\u00fc PowerShell \u00fczerinden kontrol edip kapatmak bu riski do\u011frudan engeller.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Protokol\u00fcn durumunu denetlemek i\u00e7in \u015fu komut kullan\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Get-WindowsOptionalFeature -Online -FeatureName SMB1Protocol<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">E\u011fer \u00f6zellik etkin durumdaysa (State: Enabled), a\u015fa\u011f\u0131daki komutla kal\u0131c\u0131 olarak devre d\u0131\u015f\u0131 b\u0131rak\u0131labilir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol -NoRestart<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu i\u015flem, a\u011f genelinde eski SMB a\u00e7\u0131klar\u0131ndan faydalanan solucan (worm) tabanl\u0131 fidye yaz\u0131l\u0131m\u0131 varyantlar\u0131n\u0131n yay\u0131lma yolunu keser.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">G\u00f6lge Kopyalar\u0131n ve Yedeklerin \u0130zlenmesi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Fidye yaz\u0131l\u0131mlar\u0131, \u015fifreleme i\u015flemine ba\u015flamadan \u00f6nce kurban\u0131n Windows \u00fczerindeki yerel geri y\u00fckleme noktalar\u0131n\u0131 silmeyi hedefler. Bu i\u015flem i\u00e7in genellikle i\u015fletim sistemiyle gelen yasal <code>vssadmin<\/code> arac\u0131 k\u00f6t\u00fcye kullan\u0131l\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mevcut sistem g\u00f6lge kopyalar\u0131n\u0131 listelemek i\u00e7in komut sat\u0131r\u0131nda \u015fu ifade \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vssadmin list shadows<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sistem y\u00f6neticileri, komut sat\u0131r\u0131 \u00fczerinde <code>vssadmin delete shadows<\/code> veya <code>wmic shadowcopy delete<\/code> komutlar\u0131n\u0131n \u00e7al\u0131\u015ft\u0131r\u0131lmas\u0131n\u0131 tespit etmek amac\u0131yla Windows G\u00fcvenlik Olay G\u00fcnl\u00fckleri (Event ID 4688 &#8211; Yeni S\u00fcre\u00e7 Olu\u015fturma) i\u00e7in denetim ilkelerini aktif hale getirmelidir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Linux Sistemlerde \u0130zin ve Dizin K\u0131s\u0131tlamalar\u0131<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sunucu ortamlar\u0131nda kritik web dizinlerinin de\u011fi\u015ftirilmesini engellemek i\u00e7in dosya \u00f6zniteliklerini kilitlemek etkili bir koruma katman\u0131d\u0131r. \u00d6rne\u011fin, Apache veya Nginx \u00fczerinde sadece okunmas\u0131 gereken statik bir dizinin de\u011fi\u015ftirilmesini engellemek i\u00e7in <code>chattr<\/code> arac\u0131 kullan\u0131labilir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chattr -R +i \/var\/www\/html\/statik\/<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu komuttaki <code>+i<\/code> (immutable) parametresi, k\u00f6k (root) kullan\u0131c\u0131s\u0131 dahil olmak \u00fczere hi\u00e7bir s\u00fcrecin dosyalar\u0131 silmesine, yeniden adland\u0131rmas\u0131na veya i\u00e7eri\u011fini \u015fifreleyerek de\u011fi\u015ftirmesine izin vermez. Kilit kald\u0131rmak istendi\u011finde <code>-i<\/code> parametresi kullan\u0131l\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Fidye Yaz\u0131l\u0131m\u0131na Kar\u015f\u0131 Temel Stratejiler<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fidye yaz\u0131l\u0131m\u0131 sald\u0131r\u0131lar\u0131na kar\u015f\u0131 yaln\u0131zca antivir\u00fcs \u00e7\u00f6z\u00fcmlerine g\u00fcvenmek yeterli de\u011fildir. Kapsaml\u0131 bir savunma stratejisi olu\u015fturulmal\u0131d\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>3-2-1 Yedekleme Modeli: Verilerin en az 3 kopyas\u0131 tutulmal\u0131, bu kopyalar 2 farkl\u0131 medya t\u00fcr\u00fcnde saklanmal\u0131 ve en az 1 kopya a\u011fdan tamamen izole edilmi\u015f (offline\/air-gapped) bir ortamda bar\u0131nd\u0131r\u0131lmal\u0131d\u0131r.<\/li>\n\n<li>En Az Yetki Prensibi (Least Privilege): Kullan\u0131c\u0131 hesaplar\u0131 g\u00fcnl\u00fck i\u015flemler i\u00e7in yerel y\u00f6netici yetkilerine sahip olmamal\u0131d\u0131r; zararl\u0131 bir ek a\u00e7\u0131ld\u0131\u011f\u0131nda yaz\u0131l\u0131m\u0131n sistem geneline yay\u0131lmas\u0131 bu sayede engellenir.<\/li>\n\n<li>A\u011f Segmentasyonu: \u015eirket a\u011f\u0131 b\u00f6l\u00fcmlere ayr\u0131lmal\u0131; muhasebe, insan kaynaklar\u0131 ve sunucu katmanlar\u0131 aras\u0131ndaki trafik g\u00fcvenlik duvar\u0131 kurallar\u0131 ile s\u0131n\u0131rland\u0131r\u0131lmal\u0131d\u0131r.<\/li>\n\n<li>D\u00fczenli Yama Y\u00f6netimi: \u0130\u015fletim sistemleri, internete a\u00e7\u0131k servisler ve u\u00e7 nokta yaz\u0131l\u0131mlar\u0131 g\u00fcvenlik g\u00fcncellemeleri yay\u0131nland\u0131\u011f\u0131 anda test edilerek g\u00fcncellenmelidir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Fidye yaz\u0131l\u0131m\u0131, teknik zafiyetler ile insan hatas\u0131n\u0131 birle\u015ftiren y\u0131k\u0131c\u0131 bir siber sald\u0131r\u0131 modelidir. Bu tehditten korunman\u0131n en kesin yolu, sald\u0131r\u0131 ger\u00e7ekle\u015ftikten sonra fidye \u00f6demek de\u011fil; sald\u0131r\u0131 ger\u00e7ekle\u015fmeden \u00f6nce yedeklilik, sistem s\u0131k\u0131la\u015ft\u0131rma ve eri\u015fim denetimlerini eksiksiz uygulamakt\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Bir sonraki ad\u0131m olarak kurumunuzun veya ki\u015fisel cihazlar\u0131n\u0131z\u0131n RDP ba\u011flant\u0131 yap\u0131land\u0131rmalar\u0131n\u0131 g\u00f6zden ge\u00e7irebilir, harici yedekleme \u00fcnitelerinizi a\u011fdan izole ederek test geri y\u00fcklemeleri (restore drill) ger\u00e7ekle\u015ftirebilirsiniz.<\/p>","protected":false},"excerpt":{"rendered":"<p>Fidye yaz\u0131l\u0131mlar\u0131n\u0131n \u00e7al\u0131\u015fma prensiplerini, sistemleri nas\u0131l hedef ald\u0131\u011f\u0131n\u0131 ve teknik savunma y\u00f6ntemlerini bu rehberde inceliyoruz.<\/p>","protected":false},"author":1,"featured_media":10280,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[229],"tags":[581,582,11,74,583],"class_list":["post-10279","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-siber-guvenlik","tag-fidye-yazilimi","tag-ransomware","tag-siber-guvenlik","tag-veri-guvenligi","tag-zararli-yazilim"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fidye Yaz\u0131l\u0131m\u0131 (Ransomware) Nedir? - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"Fidye yaz\u0131l\u0131m\u0131 (ransomware) nedir, sistemlere nas\u0131l bula\u015f\u0131r ve nas\u0131l engellenir? 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