This attack could pose a serious security threat. You should take immediate action to stop any damage or prevent further damage from happening.
This signature detects Watchbog malware scanning activity.
Watchbog is a linux malware that employs various exploits to target vulnerable instances of software including but not limited to Exim, Jira, Nexus Repository Manager 3, ThinkPHP, and Solr. It has also includes a scanner for CVE-2019-0708 (Bluekeep).