Linux Security

Sandfly Linux File Entropy Scanner Updated

June 30, 2022

Our entropy scanner sandfly-filescan has been updated and renamed to sandfly-entropyscan and now features Linux process scanning to help quickly spot packed and encrypted malware. You can get it…

Leveling Up Your Linux Security

February 22, 2022

We get fan mail about Sandfly and how we've helped people, but we're even more excited when we get a fan blog post. A user of Sandfly writes about their experience from the perspective of a SOC…

Log4j Kinsing Linux Stealth Malware in the Wild

December 14, 2021

A severe vulnerability in the popular Java Log4j package ( CVE-2021-44228 ) allows remote code execution on Linux and other platforms. Within about a day of being publicized, the cryptomining malware…

Linux Stealth Rootkit Malware with EDR Evasion

November 28, 2021

Recently, Sandfly was contacted to investigate an incident involving a novel piece of Linux stealth malware. What made this malware interesting is it deployed a full stealth rootkit to hide itself,…

Detecting CronRAT Crontab Malware on Linux

November 28, 2021

Security researchers recently discovered a new kind of Linux malware that was hiding its payload as part of an illegal crontab entry on Linux. The malware is being used to insert card skimming…

Linux Command Line Forensics and Intrusion Detection Cheat Sheet

May 20, 2021

Below is our Linux command line forensics and intrusion detection cheat sheet along with a presentation given at Purplecon 2018 . These resources can help you investigate a Linux host for compromise…