{"version":"1.0","provider_name":"Imperative Business Ventures Limited","provider_url":"https:\/\/blog.ibvl.in","title":"DLLs &amp; TLS Callbacks, (Fri, Dec 19th) - Imperative Business Ventures Limited","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"h98Z23LCrR\"><a href=\"https:\/\/blog.ibvl.in\/index.php\/2025\/12\/19\/dlls-tls-callbacks-fri-dec-19th\/\">DLLs &amp; TLS Callbacks, (Fri, Dec 19th)<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/blog.ibvl.in\/index.php\/2025\/12\/19\/dlls-tls-callbacks-fri-dec-19th\/embed\/#?secret=h98Z23LCrR\" width=\"600\" height=\"338\" title=\"&#8220;DLLs &amp; TLS Callbacks, (Fri, Dec 19th)&#8221; &#8212; Imperative Business Ventures Limited\" data-secret=\"h98Z23LCrR\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/blog.ibvl.in\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","description":"Xavier&#8217;s diary entry &#8220;Abusing DLLs EntryPoint for the Fun&#8221; inspired me to do some tests with TLS Callbacks and DLLs. TLS stands for Thread Local Storage. TLS Callbacks are an\u00a0execution mechanism in Windows PE files that lets code run automatically when a process or thread starts, before the program\u2019s normal entry point is reached. I&#8217;ve [&hellip;]","thumbnail_url":"https:\/\/isc.sans.edu\/diaryimages\/images\/20251217-193116.png"}