SOC138 Detected Suspicious Xls File - Practice with SOC Alert

Title Idea: LetsDefend Walkthrough | SOC138 - Detected Suspicious Xls File (Event ID 77) 🛡️ Description: In this video, I break down the LetsDefend SOC138 (Event ID 77) blue team lab: Detected Suspicious Xls File. We are stepping into the shoes of a SOC analyst to investigate a high-severity alert triggered by a security monitoring agent flagging an inbound Excel spreadsheet containing potential phishing components: Alert Triage: Reviewing the SIEM event logs to identify the recipient host, internal IP address, and metadata of the suspicious .xls attachment. Malware Analysis & Hashing: Extracting the cryptographic hash of the spreadsheet file and leveraging threat intelligence platforms like VirusTotal to analyze its detection rate and behavioral characteristics. Endpoint Threat Scoping: Pivoting to the Endpoint Detection and Response (EDR) console to determine if the user opened the file, looking out for spawned child processes (like cmd.exe or powershell.exe) that indicate macro execution. Playbook Execution: Walking through the proper containment workflow to isolate the machine from the network and safely neutralize the threat vector. 📖 Check out the full step-by-step written guide here:   / letsdefend-sa-malware-event-id-77-walkthrough   This lab is fantastic for mastering the workflow of pivoting between email security indicators, file hashes, and host-level process logs to verify true infections! If you find this breakdown helpful, please like, comment, and subscribe for more hands-on cybersecurity lab walkthroughs! #Cybersecurity #SOCAnalyst #LetsDefend #BlueTeam #IncidentResponse #MalwareAnalysis #PhishingDefense #EDR #LogAnalysis