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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…
Linux Stealth Rootkit Malware with EDR Evasion
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
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…