Suspicious Network Connection to Known Malicious Domains or API Pattern
This rule detects network connections to specific domains known to be associated with malicious activity or to a suspicious API pattern often used by malware for command and control. The domains 'openanyworddocument.com', 'kittyfreespace.com', 'searchdocumentsfree.com', 'autoupdatet.com', 'autoupdaters.com', and 'autoupdatethis.com' have been observed in various campaigns. The regex pattern '/api/(init|cl)/[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}' targets a common API endpoint structure used for initialization or client communication by certain types of malware, often involving a GUID.
Microsoft Sentinel (KQL)
