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This rule detects if your Apache or NGINX web servers are being scanned for the log4j vulnerability. The initial vulnerability was identified as CVE-2021-44228.
This signal evaluated that jndi:(ldap OR rmi OR dns)
has been detected in the HTTP header fields user agent
and referrer
or referer
.
Base64 was detected in an http.user_agent or http.referrer
rule was also triggered and follow the Triage and response
steps in that rule.Note: Datadog’s The Monitor
blog has an article published about “The Log4j Logshell vulnerability: Overview, detection, and remediation”.