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CS0-003 · Question #60

An analyst notices there is an internal device sending HTTPS traffic with additional characters in the header to a known-malicious IP in another country. Which of the following describes what the…

The correct answer is A. Beaconing. The analyst has noticed beaconing, which is a common technique used by compromised internal devices to communicate with a command-and-control server.

Submitted by neha2k· Mar 6, 2026Security Operations

Question

An analyst notices there is an internal device sending HTTPS traffic with additional characters in the header to a known-malicious IP in another country. Which of the following describes what the analyst has noticed?

Options

  • ABeaconing
  • BCross-site scripting
  • CBuffer overflow
  • DPHP traversal

How the community answered

(22 responses)
  • A
    86% (19)
  • C
    5% (1)
  • D
    9% (2)

Why each option

The analyst has noticed beaconing, which is a common technique used by compromised internal devices to communicate with a command-and-control server.

ABeaconingCorrect

Beaconing refers to a compromised system periodically sending outbound communications to a command and control (C2) server, often disguised as legitimate traffic like HTTPS but with anomalies or covert data in headers. The description of 'additional characters in the header' to a 'known-malicious IP' strongly indicates this type of covert C2 communication.

BCross-site scripting

Cross-site scripting (XSS) is a web vulnerability where malicious scripts are injected into trusted websites to target users' browsers, which does not fit the description of an internal device communicating with a malicious IP.

CBuffer overflow

A buffer overflow is a software vulnerability that occurs when a program attempts to write data beyond its allocated buffer, often leading to crashes or code execution, not a description of network traffic patterns.

DPHP traversal

PHP traversal (or Path Traversal) is a web vulnerability allowing access to restricted directories and files by manipulating file paths, which is unrelated to an internal device sending specific traffic patterns to a malicious IP.

Concept tested: Command and Control (C2) beaconing detection

Source: https://learn.microsoft.com/en-us/microsoft-365/security/defender-for-endpoint/find-malicious-beaconing-using-network-data?view=o365-worldwide

Topics

#C2 traffic#beaconing#network anomaly detection

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