StyleSmuggler cron persistence via gvfsd-user/fc-cache/chronyd implants

Ankit Mehta@Secvyn

•updated Sep 8, 2026•0•0•1

Detects direct unauthorized modifications to Linux crontab files or the addition of specific known malicious cron job patterns. It specifically monitors for file changes in '/var/spool/cron' and correlates them with 'crontab -e' process executions to identify manual versus automated or malicious modifications. Additionally, it checks for specific hardcoded malicious patterns commonly associated with known threat activity.