defensive-file-upload

Detect webshell uploads by running YARA scans against upload directories and correlating matches with HTTP requests and file-creation events in logs to confirm malicious activity. This approach surfaces webshells planted via file-upload abuse.

Investigating file-upload abuse involves applying Sigma rules for HTTP requests to upload paths and mapping file-creation events to identify malicious payloads. This accelerates incident response and enables rapid containment of compromised endpoints.

Yes, you can use KQL queries for MDE DeviceFileEvents and IIS log analysis to hunt for webshell activity. These queries surface suspicious file creation and HTTP requests associated with file-upload abuse across web servers.

Yes, this approach supports SOC triage by applying Sigma-based monitoring for HTTP requests targeting upload paths. It maps file-creation events and YARA signatures to identify webshell activity for rapid containment.

Start a YARA scan by inspecting upload directories and webroots for webshell signatures. Correlate detected files with web server logs to confirm suspicious activity and begin incident containment.