// soc investigation 2026-01-22
SOC119 SOC119 - Proxy - Malicious Executable File Detected
letsdefend Medium closed ✗ false positive
mitre/T1204
analyst verdict FALSE POSITIVE

🎯 MITRE ATT&CK

T1204 User Execution

👤 Who

Endpoint 172.16.17.5 accessed a URL that triggered the SOC119 Proxy Malicious Executable File Detected alert.

🔎 What

The alert was generated after the endpoint accessed https://www.win-rar.com/postdownload.html?&L=0&Version=32bit which was flagged as a potential malicious executable download. The URL was analyzed in VirusTotal and returned no malicious detections. Investigation confirmed the domain win-rar.com is the legitimate WinRAR distribution website used for archive extraction software. No malicious file execution or suspicious endpoint activity was observed.

🕐 When

Event Time Mar 21 2021 01:02 PM
Alert Closed Jan 22 2026 09:34 AM

📍 Where

Endpoint 172.16.17.5
URL https://www.win-rar.com/postdownload.html?&L=0&Version=32bit
Event ID 83
Rule SOC119 Proxy Malicious Executable File Detected

💡 Why

The alert was triggered due to proxy detection logic identifying an executable download pattern. Analysis confirmed the URL is legitimate and no malicious behavior occurred on the endpoint. No indicators of compromise were identified. The alert was assessed as a False Positive and no further action was required.