--- title: Raining Dinosaurs — Storm-2603 Lab Writeup [CyberDefenders] description: A detailed CTF lab writeup for the CyberDefenders 'Storm-2603' challenge, walking through a full ransomware attack chain. The scenario involves a November 2025... canonical: https://daily.dev/posts/raining-dinosaurs-storm-2603-lab-writeup-cyberdefenders--vdbyht8jx twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Raining Dinosaurs — Storm-2603 Lab Writeup [CyberDefenders] | daily.dev og:description: A detailed CTF lab writeup for the CyberDefenders 'Storm-2603' challenge, walking through a full ransomware attack chain. The scenario involves a November 2025... og:url: https://daily.dev/posts/raining-dinosaurs-storm-2603-lab-writeup-cyberdefenders--vdbyht8jx og:image: https://api.daily.dev/og/posts/VDByhT8JX.png og:image:alt: Raining Dinosaurs — Storm-2603 Lab Writeup [CyberDefenders] og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Raining Dinosaurs — Storm-2603 Lab Writeup [CyberDefenders] **[InfoSec Write-ups](https://daily.dev/sources/infosecwriteups)** · 11 min read · 0 upvotes · 0 comments ## Summary A detailed CTF lab writeup for the CyberDefenders 'Storm-2603' challenge, walking through a full ransomware attack chain. The scenario involves a November 2025 incident where attackers exploited CVE-2025-59287 to gain initial access on a WSUS server, used Velociraptor as a C2 beacon, performed network scanning, created backdoor accounts, moved laterally to a domain controller, exfiltrated 262 files to a remote server, and finally deployed LockBit-style ransomware (appending .xlockxlock extension). Each question is answered with specific Splunk queries, decoded PowerShell commands, and malware analysis using pyinstxtractor-ng. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Hackers Turn Velociraptor DFIR Tool Into Weapon in LockBit Ransomware Attacks](https://daily.dev/posts/hackers-turn-velociraptor-dfir-tool-into-weapon-in-lockbit-ransomware-attacks-gss35ul3j) · The Hacker News · 1 upvotes · 0 comments - [Open-source DFIR Velociraptor was abused in expanding ransomware efforts](https://daily.dev/posts/open-source-dfir-velociraptor-was-abused-in-expanding-ransomware-efforts-gc5bjefsf) · CSO Online · 1 upvotes · 0 comments - [Web Shells, Tunnels, and Ransomware: Dissecting a Warlock Attack](https://daily.dev/posts/web-shells-tunnels-and-ransomware-dissecting-a-warlock-attack-pabj8acyc) · Trend Micro · 0 upvotes · 0 comments --- Tags: [#malware](https://daily.dev/tags/malware), [#logging](https://daily.dev/tags/logging), [#ransomware](https://daily.dev/tags/ransomware) [View this post on daily.dev](https://daily.dev/posts/raining-dinosaurs-storm-2603-lab-writeup-cyberdefenders--vdbyht8jx) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Raining Dinosaurs — Storm-2603 Lab Writeup [CyberDefenders]","url":"https://daily.dev/posts/raining-dinosaurs-storm-2603-lab-writeup-cyberdefenders--vdbyht8jx","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/raining-dinosaurs-storm-2603-lab-writeup-cyberdefenders--vdbyht8jx"},"datePublished":"2026-06-09T09:45:42.079Z","dateModified":"2026-06-09T09:46:12.177Z","description":"A detailed CTF lab writeup for the CyberDefenders 'Storm-2603' challenge, walking through a full ransomware attack chain. 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