Stealthwatch is the technology that an engineer should use to fetch logs from a proxy server and generate actual events based on the data received. Cisco Secure Network Analytics, formerly known as Stealthwatch, provides the capability to configure proxy server logs so that the Flow Collector can receive the information. The Stealthwatch Management Console then displays this information on the Flow Proxy Records page, which includes URLs and application names of the traffic inside a network going through the proxy server1.
References :=
* Cisco Secure Network Analytics Proxy Log Configuration Guide

SIEM (Security Information and Event Management) systems are solutions that provide real-time analysis of security alerts generated by applications and network hardware. They collect, store, analyze, and report on log data for incident response, forensics, and regulatory compliance. On the other hand, SOAR (Security Orchestration Automation and Response) platforms allow organizations to collect data about security threats from multiple sources and respond to low-level security events without human assistance. References: Cisco Cybersecurity Operations Fundamentals

In the context of a cybersecurity breach, attribution involves identifying the responsible party. Since the external USB device was not found, the focus shifts to the actions performed by the receptionist. Analyzing these actions can provide insights into how the breach occurred and may help in attributing the incident to the threat actor References := Cisco Certified CyberOps Associate 200-201 Certification Guide

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* It is a string of HTML code that appears to be an example of an attack, specifically "<IMG SRC=j%
41vascript:alert('attack')>".
* The code suggests an attempt to execute JavaScript within an image source attribute, indicative of a cross-site scripting attack.