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CS0-003 · Question #345

A security analyst receives an alert for suspicious activity on a company laptop. An excerpt of the log is shown below: Which of the following has most likely occurred?

The correct answer is A. An Office document with a malicious macro was opened. An alert showing an Office application spawning unusual child processes, such as command-line interpreters, strongly suggests the execution of a malicious macro embedded in an Office document.

Submitted by weili_xi· Mar 6, 2026Security operations

Question

A security analyst receives an alert for suspicious activity on a company laptop. An excerpt of the log is shown below:

Which of the following has most likely occurred?

Exhibit

CS0-003 question #345 exhibit

Options

  • AAn Office document with a malicious macro was opened.
  • BA credential-stealing website was visited.
  • CA phishing link in an email was clicked.
  • DA web browser vulnerability was exploited.

How the community answered

(25 responses)
  • A
    76% (19)
  • B
    12% (3)
  • C
    4% (1)
  • D
    8% (2)

Why each option

An alert showing an Office application spawning unusual child processes, such as command-line interpreters, strongly suggests the execution of a malicious macro embedded in an Office document.

AAn Office document with a malicious macro was opened.Correct

Malicious macros embedded in Office documents often execute arbitrary commands or scripts upon opening, leading to the Office application (e.g., WINWORD.EXE, EXCEL.EXE) launching command-line tools (e.g., CMD.EXE, POWERSHELL.EXE) or other executables that deviate from normal user behavior, indicating a macro-based attack.

BA credential-stealing website was visited.

A credential-stealing website visit would typically involve browser activity, network connections to suspicious domains, or form submissions, not necessarily an Office application spawning system processes.

CA phishing link in an email was clicked.

Clicking a phishing link in an email typically leads to browser activity, potentially downloading malware or redirecting to malicious sites, rather than an Office application directly executing system commands.

DA web browser vulnerability was exploited.

A web browser vulnerability exploit would originate from browser activity, potentially leading to shell execution or malware download, but the primary indicator would be related to the browser process itself, not an Office application.

Concept tested: Interpreting security logs for macro execution

Source: https://attack.mitre.org/techniques/T1566/001/

Topics

#Malicious macros#log analysis#attack vectors

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