Rootkits

Detecting Linux memfd_create() Fileless Malware with Command Line Forensics

July 08, 2020

A developing threat to Linux over the last several years has been the idea of fileless malware. Fileless Linux malware is difficult to detect. It's designed to inject itself into a running Linux…

Detecting Linux Kernel Process Masquerading with Command Line Forensics

March 30, 2020

Linux kernel process masquerading is sometimes used by malware to hide when it is running. Let’s go over how you can unmask a piece of Linux malware using this tactic. What is Linux Kernel Process…

How To Decloak Stealth Linux Cryptocurrency Mining Malware

December 16, 2019

Increasingly on Linux we are seeing malware deploying anti-detection and evasion tactics. In this post we’re going to go over a recent piece of malware that used a commonly available tool for hiding…

Sandfly Filescan Open Source File Entropy Scanner for Linux

November 25, 2019

We’re releasing an open source tool today called sandfly-filescan . Sandfly-filescan allows Linux admins and incident responders to quickly scan for compressed or encrypted executable files often…

Basic Linux Malware Process Forensics for Incident Responders

September 30, 2019

Let’s go step-by-step and do some basic live process forensics for Linux. Today’s attack is a bind shell backdoor waiting for a connection on Ubuntu. Simulated Bind Shell Attack If you want to…

Using Linux utmpdump for Forensics and Detecting Log File Tampering

July 31, 2019

In this post we’re going to show you how to use utmpdump for investigating Linux audit logs for signs of compromise. Seemingly unknown by many, the utmpdump command is a great tool for Linux…