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
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 forensics …
READ MOREUsing Linux utmpdump for Forensics and Detecting Log File Tampering
Attackers on Linux often try to establish persistence so they can maintain access to a host. The most common way to do this is with a cron job that is scheduled to run and re-install …
READ MOREGetting an Attacker IP Address from a Malicious Linux At Job
A new Linux stealth malware was discovered by researchers last week. The malware, named HiddenWasp, is a remote access tool that has two modes of infection depending on whether it has root level or user …
READ MOREDetecting and De-Cloaking HiddenWasp Linux Stealth Malware
Often, Linux malware will delete itself after it starts so that file scanners and integrity checks won’t see the binary present. It also can make forensic analysis harder if you can’t get to the binary …
READ MOREHow To Recover A Deleted Binary From Active Linux Malware
In this post and video we’re going to explore the Linux /proc directory further by digging into a live process and the environment variables it presents. The basic format for the command we’ll use is …
READ MOREUsing Linux Process Environment Variables for Live Forensics
In this video Sandfly founder Craig Rowland goes over the basics behind using command line tools on Linux to look into a suspicious process. You’ll learn how to start a benign process and have it …
READ MOREUsing Command Line Tools to Find Process Masquerading Linux Malware