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The Big Data Blog


NTUSER.Dat : What the User Was Looking For
There's a category of forensic artifact that doesn't get the dramatic attention of malware persistence or network geolocation — but quietly delivers some of the most damning evidence in theft and intrusion cases. These are the artifacts that capture intent : what the user was searching for where they were navigating which files they were opening or saving. The registry keeps meticulous records of all three. And unlike many artifacts that require interpretation, these ones te
Mar 31, 20244 min read


System Configuration: Persistence & Shutdown
Two questions sit at the heart of almost every malware investigation: how did it survive a reboot? And when did the machine actually go offline? The first question leads you into one of the most abused corners of the Windows operating system — autostart locations. The second leads you to a single registry value that quietly timestamps every clean shutdown the machine has ever had. Neither topic is glamorous. Both are essential. -----------------------------------------------
Mar 30, 20244 min read


System Configuration: File Shares & Offline Caching
Most forensic investigations focus on what a user did with files on their own machine. But there's a category of activity that flies under the radar of even experienced analysts: files accessed from — or exfiltrated through — Windows file sharing and offline caching mechanisms. A shared folder on a workstation. A cached copy of a network file that persists after the user disconnects. These aren't exotic attack techniques. They're built-in Windows features being used in ways
Mar 29, 20243 min read


System Configuration: Network Artifacts & Filesystem Timestamps
There's a moment in every good investigation where the evidence stops being abstract and starts being geographic . Not just "this file was opened" — but "this laptop was sitting in an airport in Utah on a Tuesday afternoon, connected to a specific access point, and here's the MAC address to prove it." That moment is made possible by a surprisingly rich collection of registry artifacts that Windows quietly accumulates every time a network cable gets plugged in, a Wi-Fi passwor
Mar 28, 20244 min read


System Configuration: Reading the Machine's Own Biography
Before you chase a single artifact, before you open a single log file, you need to answer a deceptively simple question: what exactly is this machine? Not in a philosophical sense. In a very practical one. What version of Windows is it running? How long has it been running? What's it called? What time zone does it think it's in? These aren't glamorous questions, but getting them wrong — or skipping them entirely — will quietly poison the rest of your investigation. Think of s
Mar 27, 20244 min read
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