The answer is to isolate the host from the network and revoke its remote access, because the exhibit shows active lateral movement via SMB traffic from a macro-launched script, meaning the threat is already spreading to other systems. Immediate containment for lateral movement requires cutting the communication path at the network layer—such as disabling the switch port or using network access control—to stop the spread before the team determines the full scope. On the Security+ SY0-701 exam, this scenario tests your understanding of the incident response priority: containment first, then eradication and recovery, a sequence often emphasized in the exam objectives. A common trap is to jump to scanning or patching the host, but that wastes time while the malware continues to move laterally. Remember the mnemonic “ICE” for Incident Response: Isolate, Contain, then Eradicate—always stop the spread before you clean up.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Host: finance-lap07
10:22:11 winword.exe spawned powershell.exe -enc <redacted>
10:22:14 powershell.exe created C:\Users\ana\AppData\Roaming\rclone.exe
10:24:02 file rename activity: 184 files changed to *.locked
10:24:09 outbound SMB connections to 10.20.4.18 and 10.20.4.19
10:25:01 EDR status: endpoint still connected to corporate VPN
User report: 'My shared files stopped opening and the folder names changed.'
Based on the exhibit, what is the best immediate action for the SOC or IR team?
A finance workstation shows evidence of a macro-launched script, followed by file renaming and lateral SMB traffic to two other hosts. The team has not yet determined the full scope of the incident.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Host: finance-lap07
10:22:11 winword.exe spawned powershell.exe -enc <redacted>
10:22:14 powershell.exe created C:\Users\ana\AppData\Roaming\rclone.exe
10:24:02 file rename activity: 184 files changed to *.locked
10:24:09 outbound SMB connections to 10.20.4.18 and 10.20.4.19
10:25:01 EDR status: endpoint still connected to corporate VPN
User report: 'My shared files stopped opening and the folder names changed.'
A
Isolate the host from the network and revoke its remote access to stop further spread.
The workstation shows active compromise with file encryption behavior and outbound lateral movement. Immediate containment should stop additional SMB propagation and protect neighboring systems before deeper analysis begins.
B
Restore the workstation from backup immediately before preserving any evidence.
Why wrong: Immediate restoration could destroy forensic evidence and does not stop the attacker from continuing lateral movement elsewhere.
C
Run a vulnerability scan against the subnet to see whether the malware exploited an unpatched service.
Why wrong: That may help later in root cause analysis, but it is not the priority while the compromise is still active.
D
Notify users to ignore the issue until the next maintenance window because the incident is likely self-limiting.
Why wrong: The logs show ongoing malicious activity, so waiting would increase business impact and spread risk significantly.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the host from the network and revoke its remote access to stop further spread.
The exhibit shows a macro-launched script, file renaming, and lateral SMB traffic to two other hosts, indicating active lateral movement. Isolating the host (e.g., via network access control or disabling the switch port) immediately stops the spread of the malware to other systems, preserving the ability to investigate without further compromise. This aligns with the first step in incident response: containment before eradication or recovery.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Isolate the host from the network and revoke its remote access to stop further spread.
Why this is correct
The workstation shows active compromise with file encryption behavior and outbound lateral movement. Immediate containment should stop additional SMB propagation and protect neighboring systems before deeper analysis begins.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Restore the workstation from backup immediately before preserving any evidence.
Why it's wrong here
Immediate restoration could destroy forensic evidence and does not stop the attacker from continuing lateral movement elsewhere.
✗
Run a vulnerability scan against the subnet to see whether the malware exploited an unpatched service.
Why it's wrong here
That may help later in root cause analysis, but it is not the priority while the compromise is still active.
✗
Notify users to ignore the issue until the next maintenance window because the incident is likely self-limiting.
Why it's wrong here
The logs show ongoing malicious activity, so waiting would increase business impact and spread risk significantly.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option C (vulnerability scan) because they think identifying the root cause is the priority, but in an active incident with lateral movement, containment (isolation) must come first per the NIST SP 800-61 incident response framework.
Trap categories for this question
Command / output trap
The logs show ongoing malicious activity, so waiting would increase business impact and spread risk significantly.
Detailed technical explanation
How to think about this question
SMB (Server Message Block) traffic on ports 139/445 is commonly used for lateral movement in Windows environments, often via tools like PsExec or WMI. Isolating the host can be done by disabling the network interface card (NIC) via the OS, blocking the MAC address at the switch, or using EDR quarantine features—each method stops SMB connections instantly. In a real-world scenario, failure to isolate quickly can allow ransomware to encrypt file shares across the domain within minutes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolate the host from the network and revoke its remote access to stop further spread. — The exhibit shows a macro-launched script, file renaming, and lateral SMB traffic to two other hosts, indicating active lateral movement. Isolating the host (e.g., via network access control or disabling the switch port) immediately stops the spread of the malware to other systems, preserving the ability to investigate without further compromise. This aligns with the first step in incident response: containment before eradication or recovery.
What should I do if I get this SY0-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A file server is actively renaming documents and generating ransom notes. The server hosts a shared drive used by finance, and users are still online. What is the best immediate action?
medium
A.Shut the server down immediately to stop all activity as fast as possible.
✓ B.Isolate the server from the network to contain the spread while preserving evidence.
C.Restore the file server from backup before checking whether the infection is still active.
D.Run a full antivirus scan and wait for the results before taking any other action.
Why B: Option B is correct because isolating the server from the network stops the ransomware from encrypting more files or spreading laterally, while preserving volatile evidence (e.g., running processes, memory contents) needed for forensic analysis. In a live incident, immediate disconnection (not shutdown) is the standard containment step per NIST SP 800-61 and SANS incident response guidelines, as it halts the attack without destroying data in memory or logs.
Variation 2. A file server begins encrypting documents, and the SOC confirms the activity is malicious. Which incident response step should happen first to limit further damage?
easy
A.Lessons learned
✓ B.Containment
C.Recovery
D.Post-incident reporting
Why B: Containment is the correct first step because it isolates the compromised file server from the network, preventing the ransomware from encrypting additional shares or spreading laterally. The SMB protocol (port 445) used for file sharing would be blocked at the switch or firewall, halting further encryption of documents. This aligns with the NIST SP 800-61 incident response lifecycle, where containment precedes eradication and recovery.
Variation 3. A user reports a suspicious pop-up on a workstation and the SOC suspects malware. Which action should the responder take first to contain the threat?
easy
✓ A.Disconnect the workstation from the network
B.Wipe the workstation immediately
C.Return the workstation to the user after restarting it
D.Wait until the next patch cycle to see if the issue disappears
Why A: Disconnecting the workstation from the network immediately isolates the suspected malware, preventing it from communicating with command-and-control (C2) servers, spreading laterally to other hosts, or exfiltrating data. This is the first step in the NIST incident response containment phase, as it stops network-based propagation without destroying forensic evidence.
Last reviewed: Jun 11, 2026
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