This is a follow-up analysis of a previous blog about a zero-day exploit. The FortiGuard Incident Response (FGIR) team examined how remote attackers exploited multiple vulnerabilities in an appliance to gain control of a customer’s system. At the end of that blog, analysts revealed that the remote attacker had deployed a rootkit (a loadable kernel module, sysinitd.ko) and a user-space binary file (sysinitd) on the affected system by executing a shell script (Install.sh). Additionally, to establi
