Blog
How To Detect and Decloak Linux Stealth Rootkit Data
Linux stealth rookits have a variety of mechanisms to hide on a host. Aside from standard tactics such as hiding running processes (which we show you how to decloak here ), they also can hide data…
Sandfly Linux File Entropy Scanner Updated
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…
BPFDoor - An Evasive Linux Backdoor Technical Analysis
Recently Kevin Beaumont revealed a new evasive backdoor targeting Linux associated with the Chinese Red Menshen threat actors. In his article he reveals that this backdoor has been operating globally…
Security Monitoring for Threats on Embedded Linux
A new report from Mandiant entitled: Eye Spy on Your Email details a series of sophisticated attacks against embedded network devices often running Linux. In particular, the report states (emphasis…
Leveling Up Your Linux Security
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
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…