SANS Digital Forensics and Incident Response Blog

SANS Digital Forensics and Incident Response Blog

Detecting Shellcode Hidden in Malicious Files

A challenge both reverse engineers and automated sandboxes have in common is identifying whether a particular file is malicious or not. This is especially true if the malicious aspects are obfuscated and only triggered under very specific circumstances.

There are a number of techniques available to try and identify embedded shellcode, for example searching for patterns (NOP sleds, GetEIP etc), however as attackers update their methods to overcome our protections it becomes more difficult to find the code without having the exact version of the vulnerable software targeted, and allowing the exploit to successfully execute.

In this post, I will discuss a new technique I have been experimenting with, which approaches this issue from a different perspective, forcing the execution of the exploit code, no matter what software you have installed. It is based on two core principles:


  1. If you try and execute something that isn't code (e.g. a text string), the ...

DFIR Hero -- Cindy Murphy Interview

MurphyCindy Murphyis teaching our Advanced Smartphone Forensics Course in SANS Boston in August 2015. Sign up now to take this course with Cindy. We interviewed Cindy so you can get to know her a bit better. Cindy's real world experience working in law enforcement and cyber security communities combined with her unending knowledge of smartphone forensics (and almost everything else) makes her one of the best and most sought after speakers in the entire

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How to Install SIFT Workstation and REMnux on the Same Forensics System

Combine SIFT Workstation and REMnux on a single system to create a supercharged Linux toolkit for digital forensics and incident response tasks. Here's how.

New Windows Forensics Evidence of Poster Released

Poster


Link for new poster ->http://dfir.to/GET-FREE-DFIR-POSTER

The "Evidence of..." categories were originally created by SANS Digital Forensics and Incidence Response faculty for the SANS course FOR408: Windows Forensics. The categories map a specific artifact to the analysis questions that it will help to answer. Use this poster as a cheat-sheet to help you remember where you can discover key Windows artifacts for computer intrusion, intellectual property theft, and other common cyber crime investigations.

Proper digital forensic and incident response analysis is essential to successfully solving today's complex cases.

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ESE Databases are Dirty!

With the release of Internet Explorer 10, Microsoft made a radical departure from the way previous browser artifacts were stored. The perennial Index.dat records were replaced with a centralized meta-data store for the browser using the proven "JET Blue" Extensible Storage Engine (ESE) database format. While many forensic examiners have remained blissfully unaware of the ESE format, it has been increasingly used throughout Microsoft products for Exchange, NTDS.DIT, the Windows search database, Windows Live Messenger contacts, and Internet Explorer (IE). With the introduction of an enterprise-grade database hosting network artifacts, it is now time for every Windows investigator to understand how the database works and what data they may be missing. Remember that even if a user never opens Internet Explorer, there may still be valuable records in their IE database including files opened on the local system, network shares, and removable devices. It may also hold evidence of

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