{"id":28082,"date":"2025-08-23T01:00:28","date_gmt":"2025-08-22T22:00:28","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/siber-guvenlik-haftalik-ozeti-22-agustos-2025\/"},"modified":"2025-08-23T01:00:28","modified_gmt":"2025-08-22T22:00:28","slug":"siber-guvenlik-haftalik-ozeti-22-agustos-2025","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/siber-guvenlik-haftalik-ozeti-22-agustos-2025\/","title":{"rendered":"Siber G\u00fcvenlik Haftal\u0131k \u00d6zeti &#8211; 22 A\u011fustos 2025"},"content":{"rendered":"<p>Siber G\u00fcvenlik Haftal\u0131k \u00d6zeti &#8211; 22 A\u011fustos 2025<\/p>\n<p>Ge\u00e7ti\u011fimiz hafta, siber g\u00fcvenlik d\u00fcnyas\u0131nda \u00f6nemli geli\u015fmeler ya\u015fand\u0131.  Kritik altyap\u0131ya y\u00f6nelik yeni tehditler, artan fidye yaz\u0131l\u0131m\u0131 sald\u0131r\u0131lar\u0131 ve geli\u015fmi\u015f tehdit akt\u00f6rlerinin taktiklerindeki de\u011fi\u015fimler,  hem bireysel kullan\u0131c\u0131lar hem de kurulu\u015flar i\u00e7in  ciddi riskler olu\u015fturuyor. Bu haftal\u0131k \u00f6zet,  son geli\u015fmeleri ele alarak,  farkl\u0131 seviyelerdeki okuyucular\u0131n bilgi ve fark\u0131ndal\u0131klar\u0131n\u0131 art\u0131rmay\u0131 ama\u00e7l\u0131yor.<\/p>\n<h2>Yeni Ba\u015flayanlar \u0130\u00e7in: Temel Siber G\u00fcvenlik Kavramlar\u0131<\/h2>\n<p>Siber g\u00fcvenlik, bilgisayar sistemlerini, a\u011flar\u0131 ve verileri yetkisiz eri\u015fim, kullan\u0131m, if\u015fa, bozulma, de\u011fi\u015ftirme veya imhadan koruma bilimidir.  Bu koruma, \u00e7e\u015fitli teknik ve y\u00f6netimsel kontrollerin uygulanmas\u0131n\u0131 gerektirir.  Yeni ba\u015flayanlar i\u00e7in temel kavramlar \u015funlard\u0131r: <\/p>\n<ul>\n<li><b>Vir\u00fcsler ve K\u00f6t\u00fc Ama\u00e7l\u0131 Yaz\u0131l\u0131mlar:<\/b> Bilgisayar sistemlerine zarar veren veya verileri \u00e7alan zararl\u0131 yaz\u0131l\u0131mlar. Antivir\u00fcs yaz\u0131l\u0131mlar\u0131 ve g\u00fcvenli internet kullan\u0131m al\u0131\u015fkanl\u0131klar\u0131 ile korunabilirler.<\/li>\n<li><b>Fideye Yaz\u0131l\u0131mlar (Ransomware):<\/b> Verileri \u015fifreleyerek eri\u015fimi engelleyen ve fidye talep eden k\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar.  Veri yedeklemeleri ve g\u00fcvenlik g\u00fcncellemeleri, ransomware sald\u0131r\u0131lar\u0131ndan korunmada \u00f6nemli rol oynar.<\/li>\n<li><b>Kimlik Av\u0131 (Phishing):<\/b> Sahte e-postalar veya web siteleri arac\u0131l\u0131\u011f\u0131yla kullan\u0131c\u0131lar\u0131n \u015fifre ve ki\u015fisel bilgilerini \u00e7almaya y\u00f6nelik sald\u0131r\u0131lar.  E-posta adreslerinin do\u011frulanmas\u0131 ve g\u00fcvenli web sitelerinin kullan\u0131m\u0131 \u00f6nemlidir.<\/li>\n<li><b>G\u00fcvenlik Duvarlar\u0131 (Firewall):<\/b> Yetkisiz a\u011f eri\u015fimini \u00f6nleyen g\u00fcvenlik sistemi.  Hem donan\u0131m hem de yaz\u0131l\u0131m tabanl\u0131 g\u00fcvenlik duvarlar\u0131 mevcuttur.<\/li>\n<li><b>\u015eifre G\u00fcvenli\u011fi:<\/b> G\u00fc\u00e7l\u00fc ve benzersiz \u015fifrelerin kullan\u0131m\u0131, siber sald\u0131r\u0131lara kar\u015f\u0131 temel bir savunma mekanizmas\u0131d\u0131r. \u015eifre y\u00f6neticileri, \u015fifre g\u00fcvenli\u011fini kolayla\u015ft\u0131r\u0131r.<\/li>\n<\/ul>\n<p>Bu temel kavramlar\u0131 anlamak,  siber g\u00fcvenlik risklerine kar\u015f\u0131 daha bilin\u00e7li ve korunakl\u0131 olman\u0131za yard\u0131mc\u0131 olacakt\u0131r. Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">fatihsoysal.com<\/a> sitesini ziyaret edebilirsiniz.<\/p>\n<h2>Orta Seviye: Geli\u015fmi\u015f Kal\u0131c\u0131 Tehditler (APT) ve Savunma Stratejileri<\/h2>\n<p>Geli\u015fmi\u015f Kal\u0131c\u0131 Tehditler (APT&#8217;ler), genellikle devlet destekli veya organize su\u00e7 gruplar\u0131 taraf\u0131ndan y\u00fcr\u00fct\u00fclen, hedefli ve sofistike siber sald\u0131r\u0131lard\u0131r.  Bu sald\u0131r\u0131lar, uzun s\u00fcreli gizlilik,  karma\u015f\u0131k teknikler ve belirli bir hedefi hedeflemeyi i\u00e7erir.  APT&#8217;lerden korunmak i\u00e7in:<\/p>\n<ul>\n<li><b>\u00c7ok Katmanl\u0131 G\u00fcvenlik:<\/b>  Antivir\u00fcs yaz\u0131l\u0131mlar\u0131, g\u00fcvenlik duvarlar\u0131, intrusion detection\/prevention sistemleri ve di\u011fer g\u00fcvenlik ara\u00e7lar\u0131n\u0131n entegre kullan\u0131m\u0131.<\/li>\n<li><b>G\u00fc\u00e7l\u00fc \u015eifreleme:<\/b> Hem verileri hem de ileti\u015fimi korumak i\u00e7in g\u00fc\u00e7l\u00fc \u015fifreleme algoritmalar\u0131 kullan\u0131m\u0131.<\/li>\n<li><b>\u0130stihbarat Toplama ve Tehdit \u0130zleme:<\/b> Potansiyel tehditlerin tespiti ve analiz edilmesi i\u00e7in s\u00fcrekli izleme ve analiz ara\u00e7lar\u0131 kullan\u0131m\u0131.<\/li>\n<li><b>G\u00fcvenlik Fark\u0131ndal\u0131\u011f\u0131 E\u011fitimi:<\/b>  \u00c7al\u0131\u015fanlar\u0131n kimlik av\u0131, fidye yaz\u0131l\u0131m\u0131 ve di\u011fer tehditler konusunda e\u011fitilmesi.<\/li>\n<li><b>Olay Yan\u0131t Planlamas\u0131:<\/b>  Bir g\u00fcvenlik olay\u0131 meydana geldi\u011finde h\u0131zl\u0131 ve etkili bir \u015fekilde m\u00fcdahale edebilmek i\u00e7in \u00f6nceden planlama yap\u0131lmas\u0131.<\/li>\n<\/ul>\n<p>\u00d6rne\u011fin, bir APT sald\u0131r\u0131s\u0131nda, sald\u0131rganlar,  kurulu\u015fun a\u011f\u0131na uzun s\u00fcreli eri\u015fim sa\u011flamak i\u00e7in,  s\u0131z\u0131nt\u0131 kitleri veya s\u0131f\u0131r g\u00fcn a\u00e7\u0131klar\u0131n\u0131 kullanabilirler.  Bu nedenle, d\u00fczenli g\u00fcvenlik g\u00fcncellemeleri ve g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131n h\u0131zl\u0131 bir \u015fekilde giderilmesi kritik \u00f6neme sahiptir. <\/p>\n<h2>\u0130leri Seviye:  Sald\u0131r\u0131 Y\u00fczeyini Azaltma ve Proaktif G\u00fcvenlik \u00d6l\u00e7\u00fcmleri<\/h2>\n<p>\u0130leri seviye siber g\u00fcvenlik, proaktif g\u00fcvenlik \u00f6l\u00e7\u00fcmlerine ve sald\u0131r\u0131 y\u00fczeyinin azalt\u0131lmas\u0131na odaklan\u0131r.  Bu,  potansiyel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131 \u00f6nceden tespit etmek ve sald\u0131r\u0131lar\u0131n \u00f6nlenmesi i\u00e7in \u00f6nlem almak anlam\u0131na gelir.  \u0130leri d\u00fczey teknikler aras\u0131nda:<\/p>\n<ul>\n<li><b>Sald\u0131r\u0131 Y\u00fczeyini Azaltma:<\/b> Gereksiz hizmetlerin ve a\u00e7\u0131klar\u0131n devre d\u0131\u015f\u0131 b\u0131rak\u0131lmas\u0131, a\u011f segmentasyonu ve eri\u015fim kontrol listelerinin kullan\u0131m\u0131.<\/li>\n<li><b>S\u0131zma Testleri (Penetration Testing):<\/b>  Sistemlerin g\u00fcvenli\u011fini de\u011ferlendirmek i\u00e7in sim\u00fcle edilmi\u015f sald\u0131r\u0131lar ger\u00e7ekle\u015ftirilmesi.  Siber g\u00fcvenlik uzmanlar\u0131, \u00e7e\u015fitli sald\u0131r\u0131 tekniklerini kullanarak sistemlerin zay\u0131f noktalar\u0131n\u0131 tespit ederler.<\/li>\n<li><b>K\u0131rm\u0131z\u0131 Tak\u0131m (Red Teaming) ve Mavi Tak\u0131m (Blue Teaming):<\/b>  Ger\u00e7ek\u00e7i sim\u00fclasyonlar arac\u0131l\u0131\u011f\u0131yla g\u00fcvenlik savunmalar\u0131n\u0131n etkinli\u011fini de\u011ferlendirme.  K\u0131rm\u0131z\u0131 tak\u0131m sald\u0131rgan rol\u00fcn\u00fc, mavi tak\u0131m ise savunma rol\u00fcn\u00fc \u00fcstlenir.<\/li>\n<li><b>Davran\u0131\u015fsal Analiz:<\/b>  Anormal aktiviteleri tespit etmek i\u00e7in makine \u00f6\u011frenmesi ve yapay zeka tekniklerinin kullan\u0131m\u0131.<\/li>\n<li><b>Mikro Segmentasyon:<\/b> A\u011f\u0131n daha k\u00fc\u00e7\u00fck, izole b\u00f6l\u00fcmlere ayr\u0131lmas\u0131, sald\u0131r\u0131n\u0131n yay\u0131lmas\u0131n\u0131 \u00f6nlemek amac\u0131yla.<\/li>\n<\/ul>\n<p>Bir vaka analizi olarak, 2024 y\u0131l\u0131nda ya\u015fanan  X \u015firketine yap\u0131lan APT sald\u0131r\u0131s\u0131n\u0131 ele alal\u0131m.  Sald\u0131rganlar,  bir \u00e7al\u0131\u015fan\u0131n\u0131n e-postas\u0131n\u0131 hedef alarak,  zararl\u0131 bir dosya g\u00f6ndermi\u015fler ve kurulu\u015fun a\u011f\u0131na s\u0131zm\u0131\u015flard\u0131r.  Daha sonra,  lateral hareket tekniklerini kullanarak  kritik sistemlere eri\u015fim sa\u011flam\u0131\u015f ve  \u00f6nemli verileri \u00e7alm\u0131\u015flard\u0131r. Bu sald\u0131r\u0131,  g\u00fcvenlik fark\u0131ndal\u0131\u011f\u0131 e\u011fitiminin ve \u00e7ok katmanl\u0131 g\u00fcvenlik \u00f6nlemlerinin \u00f6nemini bir kez daha g\u00f6stermi\u015ftir.<\/p>\n<h2>Nas\u0131l G\u00fc\u00e7l\u00fc \u015eifreler Olu\u015fturursunuz?<\/h2>\n<p>G\u00fc\u00e7l\u00fc \u015fifreler olu\u015fturmak, siber sald\u0131r\u0131lara kar\u015f\u0131 temel bir savunma mekanizmas\u0131d\u0131r.  G\u00fc\u00e7l\u00fc bir \u015fifre, tahmin edilmesi zor, uzun ve karma\u015f\u0131k olmal\u0131d\u0131r. \u0130\u015fte g\u00fc\u00e7l\u00fc \u015fifre olu\u015fturmak i\u00e7in baz\u0131 ipu\u00e7lar\u0131:<\/p>\n<ul>\n<li>En az 12 karakter uzunlu\u011funda olsun.<\/li>\n<li>B\u00fcy\u00fck ve k\u00fc\u00e7\u00fck harfler, rakamlar ve \u00f6zel karakterler i\u00e7ersin.<\/li>\n<li>Kelimeleri, isimleri veya do\u011fum tarihlerini kullanmay\u0131n.<\/li>\n<li>Her hesap i\u00e7in farkl\u0131 \u015fifreler kullan\u0131n.<\/li>\n<li>\u015eifre y\u00f6neticisi kullan\u0131n.<\/li>\n<\/ul>\n<p>\u00d6rnek olarak;  &#8220;P@$$wOrd123!&#8221;  g\u00fc\u00e7l\u00fc bir \u015fifre \u00f6rne\u011fidir.  Ancak, her zaman en az 12 karakter ve farkl\u0131 karakter t\u00fcrleri kullanarak kendinize ait benzersiz \u015fifreler olu\u015fturmal\u0131s\u0131n\u0131z. <\/p>\n<h2>Fideye Yaz\u0131l\u0131m Sald\u0131r\u0131lar\u0131ndan Nas\u0131l Korunursunuz?<\/h2>\n<p>Fideye yaz\u0131l\u0131m sald\u0131r\u0131lar\u0131,  hem bireyler hem de kurulu\u015flar i\u00e7in ciddi bir tehdit olu\u015fturmaktad\u0131r.  Bu sald\u0131r\u0131lardan korunmak i\u00e7in a\u015fa\u011f\u0131daki ad\u0131mlar\u0131 izleyebilirsiniz:<\/p>\n<ul>\n<li>D\u00fczenli olarak veri yedeklemeleri yap\u0131n ve yedekleri \u00e7evrimd\u0131\u015f\u0131 saklay\u0131n.<\/li>\n<li>G\u00fcncel antivir\u00fcs ve anti-malware yaz\u0131l\u0131mlar\u0131 kullan\u0131n.<\/li>\n<li>\u015e\u00fcpheli e-postalara veya ba\u011flant\u0131lara t\u0131klamay\u0131n.<\/li>\n<li>Yaz\u0131l\u0131mlar\u0131n\u0131z\u0131 ve i\u015fletim sisteminizi d\u00fczenli olarak g\u00fcncelleyin.<\/li>\n<li>G\u00fcvenlik duvar\u0131 kullan\u0131n.<\/li>\n<li>\u00c7al\u0131\u015fanlar\u0131n\u0131za g\u00fcvenlik fark\u0131ndal\u0131\u011f\u0131 e\u011fitimi verin.<\/li>\n<\/ul>\n<p>Bir vaka \u00f6rne\u011fi olarak,  Y \u015firketi,  bir e-posta ekine t\u0131klayan bir \u00e7al\u0131\u015fan nedeniyle fidye yaz\u0131l\u0131m\u0131 sald\u0131r\u0131s\u0131na u\u011fram\u0131\u015ft\u0131r.  \u015eirketin veri yedeklemeleri olmad\u0131\u011f\u0131 i\u00e7in,  verilerinin bir k\u0131sm\u0131n\u0131 kurtaramam\u0131\u015ft\u0131r. Bu olay,  veri yedeklemelerinin \u00f6nemini vurgular.<\/p>\n<h2>Kimlik Av\u0131 Sald\u0131r\u0131lar\u0131ndan Nas\u0131l Korunursunuz?<\/h2>\n<p>Kimlik av\u0131 sald\u0131r\u0131lar\u0131,  sahte e-postalar veya web siteleri arac\u0131l\u0131\u011f\u0131yla kullan\u0131c\u0131lar\u0131n ki\u015fisel bilgilerini \u00e7almaya y\u00f6nelik sald\u0131r\u0131lard\u0131r.  Bu sald\u0131r\u0131lardan korunmak i\u00e7in:<\/p>\n<ul>\n<li>\u015e\u00fcpheli e-postalara t\u0131klamay\u0131n.<\/li>\n<li>E-posta adresini do\u011frulay\u0131n.<\/li>\n<li>Web sitesinin g\u00fcvenli oldu\u011fundan emin olun (HTTPS).<\/li>\n<li>\u015e\u00fcpheli web sitelerine giri\u015f yapmay\u0131n.<\/li>\n<li>Ki\u015fisel bilgilerinizi payla\u015fmadan \u00f6nce dikkatli olun.<\/li>\n<\/ul>\n<p>\u00d6rne\u011fin, bir kimlik av\u0131 e-postas\u0131,  bir bankan\u0131n veya sosyal medya platformunun ad\u0131n\u0131 kullanarak,  kullan\u0131c\u0131lar\u0131n \u015fifrelerini ve ki\u015fisel bilgilerini girmeleri i\u00e7in sahte bir giri\u015f sayfas\u0131na y\u00f6nlendirebilir.  Bu nedenle,  e-postalar\u0131n ve web sitelerinin me\u015fruiyetini dikkatlice kontrol etmek \u00f6nemlidir.<\/p>\n<h2>Sonu\u00e7<\/h2>\n<p>22 A\u011fustos 2025 haftas\u0131nda ya\u015fanan siber g\u00fcvenlik olaylar\u0131,  hem bireyler hem de kurulu\u015flar i\u00e7in s\u00fcrekli bir tehdit olu\u015fturdu\u011funu g\u00f6stermi\u015ftir.  G\u00fc\u00e7l\u00fc \u015fifreler kullanmaktan,  d\u00fczenli g\u00fcncellemeler yapmaya ve g\u00fcvenlik fark\u0131ndal\u0131\u011f\u0131 e\u011fitimi almaya kadar,  siber sald\u0131r\u0131lara kar\u015f\u0131 korunmak i\u00e7in bir\u00e7ok \u00f6nlem al\u0131nabilir.  Ancak,  en etkili yakla\u015f\u0131m,  \u00e7ok katmanl\u0131 bir g\u00fcvenlik stratejisi benimsemektir.  Daha fazla bilgi i\u00e7in <a href=\"https:\/\/fatihsoysal.com\">fatihsoysal.com<\/a> sitesini inceleyebilirsiniz. <\/p>\n<h3>S\u0131k\u00e7a Sorulan Sorular<\/h3>\n<ul>\n<li><b>S:<\/b> Antivir\u00fcs yaz\u0131l\u0131m\u0131 kullanmak yeterli midir?  <b>C:<\/b> Hay\u0131r, antivir\u00fcs yaz\u0131l\u0131m\u0131 \u00f6nemli bir g\u00fcvenlik arac\u0131d\u0131r, ancak tek ba\u015f\u0131na yeterli de\u011fildir.  \u00c7ok katmanl\u0131 bir g\u00fcvenlik yakla\u015f\u0131m\u0131 benimsenmelidir.<\/li>\n<li><b>S:<\/b> \u015eifre y\u00f6neticisi kullanman\u0131n avantajlar\u0131 nelerdir?  <b>C:<\/b> \u015eifre y\u00f6neticileri,  g\u00fc\u00e7l\u00fc ve benzersiz \u015fifreler olu\u015fturmay\u0131 ve y\u00f6netmeyi kolayla\u015ft\u0131r\u0131r.  Bu sayede,  \u015fifre g\u00fcvenli\u011fi artar.<\/li>\n<li><b>S:<\/b>  Fideye yaz\u0131l\u0131m sald\u0131r\u0131s\u0131na u\u011frad\u0131\u011f\u0131mda ne yapmal\u0131y\u0131m?  <b>C:<\/b>  \u00d6ncelikle,  sisteminizi kapat\u0131n ve uzman yard\u0131m al\u0131n.  Veri yedeklemeleriniz varsa,  verilerinizi kurtarmaya \u00e7al\u0131\u015f\u0131n.  Ancak,  fidye \u00f6dememeniz \u00f6nerilir.<\/li>\n<li><b>S:<\/b>  Siber g\u00fcvenlik e\u011fitimi almak neden \u00f6nemlidir? <b>C:<\/b>  Siber g\u00fcvenlik e\u011fitimi,  \u00e7al\u0131\u015fanlar\u0131n g\u00fcvenlik risklerini anlamalar\u0131na ve korunma y\u00f6ntemlerini \u00f6\u011frenmelerine yard\u0131mc\u0131 olur.  Bu sayede,  kurulu\u015flar\u0131n siber sald\u0131r\u0131lara kar\u015f\u0131 daha diren\u00e7li hale gelmeleri sa\u011flan\u0131r.<\/li>\n<li><b>S:<\/b>  Sald\u0131r\u0131 y\u00fczeyini azaltmak nas\u0131l olur? <b>C:<\/b>  Gereksiz hizmetleri devre d\u0131\u015f\u0131 b\u0131rakarak,  g\u00fc\u00e7l\u00fc \u015fifreleme kullanarak,  d\u00fczenli g\u00fcvenlik g\u00fcncellemeleri yaparak ve a\u011f\u0131n\u0131z\u0131 segmentleyerek sald\u0131r\u0131 y\u00fczeyini azaltabilirsiniz.<\/li>\n<\/ul>\n<p>Yazar: Fatih Soysal<\/p>\n","protected":false},"excerpt":{"rendered":"Siber G\u00fcvenlik Haftal\u0131k \u00d6zeti &#8211; 22 A\u011fustos 2025 Ge\u00e7ti\u011fimiz hafta, siber g\u00fcvenlik d\u00fcnyas\u0131nda \u00f6nemli geli\u015fmeler ya\u015fand\u0131. Kritik altyap\u0131ya&hellip;","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"csco_page_header_type":"","csco_page_load_nextpost":"","csco_page_subscribe_form":"","csco_page_contact_form":"","footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-28082","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-genel","7":"cs-entry","8":"cs-video-wrap"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.5 (Yoast SEO v25.3.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Siber G\u00fcvenlik Haftal\u0131k \u00d6zeti - 22 A\u011fustos 2025<\/title>\n<meta name=\"description\" content=\"Ge\u00e7ti\u011fimiz hafta, siber g\u00fcvenlik d\u00fcnyas\u0131nda \u00f6nemli geli\u015fmeler ya\u015fand\u0131. 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