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Question

Difficulty: EasyLog Analysis and SIEM Management

A security analyst reviews the following log entry from an internal web proxy gateway:

`2026-07-27T14:22:05Z proxy01 squid[4812]: 10.10.4.15 TCP_DENIED/403 3512 GET http://known-malicious-domain.org/updater.exe - HIER_NONE/- text/html`

Which of the following conclusions can be directly drawn from this log entry? (Select TWO.)

  1. The web proxy successfully blocked the outbound GET request attempt.Answer
  2. The connection attempt originated from the internal IP address 10.10.4.15.Answer
  3. C
    The internal host 10.10.4.15 was successfully infected by updater.exe.
  4. D
    The remote server at known-malicious-domain.org returned an HTTP 200 OK status.

Answer

The proxy server blocked the outbound GET request attempt, and the connection attempt originated from the internal IP address 10.10.4.15.
Analyzing the log entry fields shows that internal IP 10.10.4.15 attempted to fetch an executable via HTTP GET. The proxy log header records 'TCP_DENIED/403', which demonstrates that the proxy policy triggered an HTTP 403 Forbidden action and prevented the file download.

Step-by-Step Solution

1
Identify the source IP address in the log header.
The log lists `10.10.4.15` as the client IP initiating the connection request.
Proxy log formats place the client IP field prior to the action status codes.
2
Examine the proxy action code and HTTP status code.
The entry displays `TCP_DENIED/403`.
`TCP_DENIED` indicates proxy policy enforcement blocking the traffic, and HTTP code `403` signifies Access Forbidden.

Key Concept

Web Proxy Log Parsing and Event Status Interpretation
Estimated Time:45s
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Topics

Log Analysis and SIEM Management

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