This rule is designed to detect potential exploitation of an open redirect vulnerability associated with the domain convertcart.com. Open redirect vulnerabilities allow attackers to redirect users from benign links to malicious sites, possibly leading to credential phishing or malware infections. The rule aims to identify messages that contain links to convertcart.com while filtering out benign uses by enforcing stricter conditions on the number and nature of these links. Specifically, it checks for instances where less than 10 links to convertcart.com are present and ensures these links meet certain criteria that are commonly exploited in the wild, such as those that include a query parameter indicating a redirect to a different URL. The detection logic also checks for trusted sender domains and flags messages from those domains as suspicious if they fail DMARC authentication or Fallback on less-trusted domains without authentication issues. By targeting the specific circumstances under which convertcart.com is used, this rule aims for a higher fidelity in identifying malicious messages without overwhelming false positives.