{"id":1151,"date":"2025-05-12T09:33:38","date_gmt":"2025-05-12T14:33:38","guid":{"rendered":"https:\/\/stagefoursecurity.com\/blog\/?p=1151"},"modified":"2025-05-12T09:33:38","modified_gmt":"2025-05-12T14:33:38","slug":"digital-forensics-101","status":"publish","type":"post","link":"https:\/\/stagefoursecurity.com\/blog\/2025\/05\/12\/digital-forensics-101\/","title":{"rendered":"Digital Forensics 101"},"content":{"rendered":"<article>\n<header>\n<h1>\ud83e\uddea Digital Forensics 101: Imaging, Memory, and Log Preservation<\/h1>\n<p><em>By James K. Bishop, vCISO | Founder, <a href=\"https:\/\/stagefoursecurity.com\" target=\"_blank\" rel=\"noopener\">Stage Four Security<\/a><\/em><\/p>\n<\/header>\n<section>\n<h2>\ud83d\udd0d Why Digital Forensics Is Core to Incident Response<\/h2>\n<p><a href=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-1171\" src=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2-300x200.png\" alt=\"\" width=\"400\" height=\"267\" srcset=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2-300x200.png 300w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2-1024x683.png 1024w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2-768x512.png 768w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/Forensics-Post-2.png 1536w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a>Forensics isn\u2019t just about solving crimes\u2014it\u2019s about understanding what happened, what was impacted, and how to prevent it from happening again. Whether you\u2019re investigating a malware infection, insider threat, or persistent attacker, proper evidence handling is critical to root cause analysis, legal action, and regulatory compliance.<\/p>\n<p>This post walks through the fundamentals of digital forensics collection: imaging disks, capturing volatile memory, and preserving critical logs in a forensically sound manner.<\/p>\n<\/section>\n<section>\n<h2>\ud83e\udde0 Core Principles of Forensic Collection<\/h2>\n<p>All forensic work should follow three golden rules:<\/p>\n<ul>\n<li><strong>Preserve the original data<\/strong> \u2014 never perform direct analysis on the source<\/li>\n<li><strong>Maintain chain of custody<\/strong> \u2014 document every touchpoint, time, and transfer<\/li>\n<li><strong>Minimize system impact<\/strong> \u2014 especially for volatile evidence like memory or active processes<\/li>\n<\/ul>\n<p>Your collection strategy must balance speed, reliability, and legal defensibility.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udcbe Disk Imaging: Full, Partial, or Targeted<\/h2>\n<p>Disk imaging is a cornerstone of post-incident analysis. Options include:<\/p>\n<h3>1. Full Bit-for-Bit Imaging<\/h3>\n<ul>\n<li>Captures the entire drive, including slack space, deleted files, partition info, and unallocated sectors<\/li>\n<li>Tools: <strong>FTK Imager<\/strong>, <strong>dd<\/strong>, <strong>Guymager<\/strong>, <strong>Magnet Acquire<\/strong><\/li>\n<\/ul>\n<h3>2. Logical Imaging<\/h3>\n<ul>\n<li>Captures only selected directories, user profiles, or known artifacts<\/li>\n<li>Faster, but may miss low-level persistence or deleted evidence<\/li>\n<\/ul>\n<h3>3. Targeted Artifact Collection<\/h3>\n<ul>\n<li>Focus on browser histories, registry keys, Event Logs, etc.<\/li>\n<li>Often used in triage or remote collection scenarios<\/li>\n<\/ul>\n<p>Always hash your image (e.g., SHA-256) before and after collection to validate integrity.<\/p>\n<\/section>\n<section>\n<h2>\ud83e\udde0 Memory Capture: Catch the Evidence Before It Evaporates<\/h2>\n<p>Memory (RAM) contains critical, ephemeral data like:<\/p>\n<ul>\n<li>Running processes and threads<\/li>\n<li>Loaded DLLs, command-line arguments<\/li>\n<li>Decrypted credentials (e.g., from LSASS)<\/li>\n<li>Active network connections and injected code<\/li>\n<\/ul>\n<p><strong>Tools:<\/strong> <em>Magnet RAM Capture, Belkasoft Live RAM Capturer, WinPmem, LiME<\/em><\/p>\n<p>Capture RAM as early as possible\u2014rebooting the machine destroys volatile memory and can eliminate the attacker\u2019s footprint.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udcdc Log Preservation: Timing Is Everything<\/h2>\n<p>Logs are often overwritten quickly. Pull critical logs early and preserve raw copies:<\/p>\n<ul>\n<li><strong>Windows:<\/strong> Security, System, Application, PowerShell, Sysmon<\/li>\n<li><strong>Linux:<\/strong> \/var\/log\/auth.log, syslog, secure, messages, journalctl<\/li>\n<li><strong>Cloud:<\/strong> AWS CloudTrail, GuardDuty, Azure Sign-ins, GCP Audit Logs<\/li>\n<\/ul>\n<p>Export and hash logs before feeding them into your SIEM or analysis tools. Time skew, log rotation, and incomplete event forwarding are common pitfalls.<\/p>\n<\/section>\n<section>\n<h2>\u2696\ufe0f Chain of Custody and Legal Considerations<\/h2>\n<p>If your investigation could result in litigation, regulatory fines, or criminal charges, proper evidence handling is essential:<\/p>\n<ul>\n<li>Log every action: who collected what, when, where, and how<\/li>\n<li>Use write blockers for disk imaging<\/li>\n<li>Tag devices with unique IDs and maintain custody logs<\/li>\n<li>Isolate original media\u2014analyze only on verified forensic copies<\/li>\n<\/ul>\n<p>Even if legal action is unlikely, these practices boost confidence and auditability.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udee0\ufe0f Building a Forensic Kit<\/h2>\n<p>Every responder should have a standard forensic toolkit. Include:<\/p>\n<ul>\n<li>USB write blockers and external drives (encrypted)<\/li>\n<li>RAM capture tools (portable)<\/li>\n<li>Drive imaging software<\/li>\n<li>Time-sync utilities and hardware hash calculators<\/li>\n<li>Documentation templates (custody, imaging logs, chain of evidence forms)<\/li>\n<\/ul>\n<p>Have your tools ready before you need them\u2014especially in regulated environments.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udce3 Final Thought<\/h2>\n<p>Digital forensics isn&#8217;t about CSI-style dramatics\u2014it&#8217;s about disciplined evidence collection that stands up to scrutiny. Whether you&#8217;re facing a targeted APT or internal misuse, proper imaging, memory capture, and log preservation will determine what you know\u2014and what you can prove.<\/p>\n<p><strong>Need help developing forensic capabilities, training responders, or equipping your SOC with evidence preservation workflows?<\/strong> <a href=\"https:\/\/stagefoursecurity.com\/blog\/partner-with-stage-four-security\/\" target=\"_blank\" rel=\"noopener\">Let\u2019s talk<\/a>.<\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\ud83e\uddea Digital Forensics 101: Imaging, Memory, and Log Preservation By James K. Bishop, vCISO | Founder, Stage Four Security \ud83d\udd0d [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1151","post","type-post","status-publish","format-standard","hentry","category-forensics-incident-response"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - 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