A big myth around investigating Linux malware is that the first tool you need is a debugger and deep knowledge of assembly to understand what it does. It’s easy for admins and security personnel responding …
READ MORELinux Malware Investigation Myth: You Don’t Need a Debugger
Let’s talk about Linux file descriptors and how to investigate a malicious process using them. What Is a File Descriptor? Since the inception of Unix (on which Linux is based), everything is a file. We …
READ MOREInvestigating Linux Process File Descriptors for Incident Response and Forensics
We have released a new tool called sandfly-processdecloak designed to decloak hidden processes from two common and easily deployed Linux Loadable Kernel Module (LKM) stealth rootkits: Diamorphine and Reptile. You can download the tool from …
READ MORELinux Stealth Rootkit Process Decloaking Tool – sandfly-processdecloak
A developing threat to Linux over the last several years has been the idea of fileless malware. Fileless malware is designed to inject itself into a running Linux system and leave no traces on the …
READ MOREDetecting Linux memfd_create() Fileless Malware with Command Line Forensics
We are pleased to announce the release of the Sandfly Splunk app. This new app is available on Splunkbase. Sandfly users can now combine the powerful search and analysis features of Splunk, with Sandfly’s leading …
READ MORESplunk App for Sandfly Agentless Intrusion Detection for Linux Now Available
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 …
READ MOREDetecting Linux Kernel Process Masquerading with Command Line Forensics
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 itself. We’ll …
READ MOREHow To Decloak Stealth Linux Cryptocurrency Mining Malware
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 linked to malware. sandfly-filescan is a utility to quickly …
READ MORESandfly Filescan Open Source File Entropy Scanner for Linux
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 simulate the …
READ MOREBasic Linux Malware Process Forensics for Incident Responders