SOC ANALYST INTERVIEW QUESTIONS 2021. THE MOST FREQUENTLY ASKED QUESTIONS IN THE INTERVIEW
Join Real-Time SOC Analyst Training by SIEM XPERT
1. Explain risk, vulnerability and threat?
TIP: A good way to start this answer is by explaining vulnerability, and threat, and then risk. Back this up with an easy-to-understand example. Vulnerability (weakness) is a gap in the protection efforts of a system, a threat is an attacker who exploits that weakness. Risk is the measure of potential loss when that the vulnerability is exploited by the threat e.g. Default username and password for a server – An attacker can easily crack into this server and compromise it
2. What is the difference between Asymmetric and Symmetric encryption and which one is better?
TIP: Keep the answer simple as this is a vast topic. Symmetric encryption uses the same key for both encryption and decryption, while Asymmetric encryption uses different keys for encryption and decryption. Symmetric is usually much faster but the key needs to be transferred over an unencrypted channel. Asymmetric on the other hand is more secure but slow. Hence, a hybrid approach should be preferred. Setting up a channel using asymmetric encryption and then sending the data using a symmetric process.
3. What is an IPS and how does it differ from IDS?
IDS is an intrusion detection system whereas an IPS is an intrusion prevention system. IDS will just detect the intrusion and will leave the rest to the administrator for further action whereas an IPS will detect the intrusion and will take further action to prevent the intrusion. Another difference is the positioning of the devices in the network. Although they work on the same basic concept but the placement is different.
4. What is XSS, how will you mitigate it?
5. What is the difference between encryption and hashing?
TIP: Keep the answer short and straight.
Point 1: Encryption is reversible whereas hashing is irreversible. Hashing can be cracked using rainbow tables and collision attacks but is not reversible.
Point 2: Encryption ensures confidentiality whereas hashing ensures Integrity.
6. Are you a coder/developer or know any coding languages?
TIP: You are not expected to be a PRO; understanding of the language will do the job.
7. What is CSRF?
Cross-Site Request Forgery is a web application vulnerability in which the server does not check whether the request came from a trusted client or not. The request is just processed directly. It can be further followed by the ways to detect this, examples, and countermeasures.
8. What is a Security Misconfiguration?
Security misconfiguration is a vulnerability when a device/application/network is configured in a way that can be exploited by an attacker to take advantage of it. This can be as simple as leaving the default username/password unchanged or too simple for device accounts etc.
9. What is a Black hat, white hat, and Grey hat hacker?
TIP: Keep the answer simple.
Black hat hackers are those who hack without authority. White hat hackers are authorized to perform a hacking attempt under a signed NDA. Grey hat hackers are white hat hackers who sometimes perform unauthorized activities.
10. What is a firewall?
TIP: Be simple with the answer, as this can get complex and lead to looped questions.
A firewall is a device that allows/blocks traffic as per the defined set of rules. These are placed on the boundary of trusted and untrusted networks.
11. How do you keep yourself updated with the information security news?
TIP: Just in case you haven’t followed any: the hacker news, ThreatPost, Pentest mag etc.
Be sure to check and follow a few security forums so that you get regular updates on what is happening in the market and about the latest trends and incidents.
12. The world has recently been hit by ……. Attack/virus etc. What have you done to protect your organization as a security professional?
Different organizations work in different ways, the ways to handle an incident is different for all. Some take this seriously and some not. The answer to this should be the process to handle an incident. Align this with the one you had and go on… just don’t exaggerate.
13. CIA triangle?
Confidentiality: Keeping the information secret.
Integrity: Keeping the information unaltered.
Availability: Information is available to the authorized parties at all times.
14. HIDS vs NIDS and which one is better and why?
HIDS is a host intrusion detection system and NIDS is a network intrusion detection system. Both the systems work on similar lines. It’s just that the placement is different. HIDS is placed on each host whereas NIDS is placed in the network. For an enterprise, NIDS is preferred as HIDS is difficult to manage, plus it consumes the processing power of the host as well.
15. What is port scanning?
Port scanning is the process of sending messages in order to gather information about the network, system, etc. by analyzing the response received.
16. What is the difference between VA and PT?
Vulnerability Assessment is an approach used to find flaws in an application/network whereas Penetration testing is the practice of finding exploitable vulnerabilities like a real attacker will do. VA is like traveling on the surface whereas PT is digging it for gold.
17. What are the objects that should be included in a good penetration testing report?
A VAPT report should have an executive summary explaining the observations on a high level along with the scope, period of testing etc. This can be followed by no of observations, category-wise split into high, medium and low. Also include detailed observation along with replication steps, screenshots of proof of concept along the remediation.
18. What is compliance?
Abiding by a set of standards set by a government/Independent party/organization. E.g. An industry which stores, processes or transmits payment-related information needs to have complied with PCI DSS (Payment card Industry Data Security Standard). Other compliance examples can be an organization complying with its own policies.
19. Tell us about your Personal achievements or certifications?
Keep this simple and relevant, getting a SOC CERTIFICATION BY SIEM XPERT can be one personal achievement. Explain how it started and what kept you motivated. How you feel now and what are your next steps.
20. Various response codes from a web application?
1xx – Informational responses
2xx – Success
3xx – Redirection
4xx – Client-side error
5xx – Server side error
21. When do you use tracert/traceroute?
In case you can’t ping the final destination, tracert will help to identify where the connection stops or gets broken, whether it is the firewall, ISP, router, etc.
22. DDoS and its mitigation?
DDoS stands for distributed denial of service. When a network/server/application is flooded with a large number of requests which it is not designed to handle making the server unavailable to legitimate requests. The requests can come from different not related sources hence it is a distributed denial-of-service attack. It can be mitigated by analyzing and filtering the traffic in the scrubbing centres. The scrubbing centres are centralized data cleansing station wherein the traffic to a website is analyzed and the malicious traffic is removed.
23. What is a WAF and what are its types?
TIP: This topic is usually not asked in detail.
WAF stands for web application firewall. It is used to protect the application by filtering legitimate traffic from malicious traffic. WAF can be either a box type or cloud-based.
24. Explain the objects of Basic web architecture?
TIP: Different organizations follow different models and networks. BE GENERIC.
A basic web architecture should contain a front-ending server, a web application server, a database server.
29. How do you handle AntiVirus alerts?
Check the policy for the AV and then the alert. If the alert is for a legitimate file then it can be whitelisted and if this is a malicious file then it can be quarantined/deleted. The hash of the file can be checked for reputation on various websites like virustotal, malwares.com, etc. AV needs to be fine-tuned so that the alerts can be reduced.
30. What is a false positive and false negative in case of IDS?
When the device generated an alert for an intrusion that has actually not happened: this is a false positive and if the device has not generated any alert and the intrusion has actually happened, this is the case of a false negative.
31. Which one is more acceptable?
False positives are more acceptable. False negatives will lead to intrusions happening without getting noticed.
32. Software testing vs. penetration testing?
Software testing just focuses on the functionality of the software and not the security aspect. Penetration testing will help identify and address security vulnerabilities.
33. What are your thoughts about Blue team and red team?
A red team is an attacker and a blue team the defender. Being on the red team seems fun but being in the blue team is difficult as you need to understand the attacks and methodologies the red team may follow.
34. What is you preferred – Bug bounty or security testing?
Both are fine, just support your answer like Bug Bounty is decentralized, can identify rare bugs, large pool of testers etc.
35. Tell us about your Professional achievements/major projects?
This can be anything like setting up your own team and processes or a security practice you have implemented. Even if the achievement is not from a security domain just express it well.
36. 2 quick points on Web server hardening?
TIP: This is a strong topic, get over with the exact answer and carry on the conversation over the lines.
Web server hardening is the filtering of unnecessary services running on various ports and the removal of default test scripts from the servers. Although web server hardening is a lot more than this and usually organizations have a customized checklist for hardening the servers. Any server getting created has to be hardened and hardening has to be re-confirmed on a yearly basis. Even the hardening checklist has to be reviewed on a yearly basis for new add-ons.
37. What is data leakage? How will you detect and prevent it?
Data leak is when data gets out of the organization in an unauthorized way. Data can get leaked through various ways – emails, prints, laptops getting lost, unauthorized upload of data to public portals, removable drives, photographs, etc. There are various controls which can be placed to ensure that the data does not get leaked, a few controls can be restricting upload on internet websites, following an internal encryption solution, restricting the mails to the internal network, restriction on printing confidential data, etc.
38. What are the different levels of data classification and why are they required?
Data needs to be segregated into various categories so that its severity can be defined, without this segregation a piece of information can be critical for one but not so critical for others. There can be various levels of data classification depending on organization to organization, in broader terms data can be classified into:
Top secret – Its leakage can cause drastic effect to the organization, e.g. trade secrets etc.
Confidential – Internal to the company e.g. policy and processes.
Public – Publicly available, like newsletters etc.
39. In a situation where a user needs admin rights on his system to do daily tasks, what should be done – should admin access be granted or restricted?
Users are usually not provided with admin access to reduce the risk, but in certain cases, the users can be granted admin access. Just ensure that the users understand their responsibility. In case any incident happens, the access should be provided for only a limited time post senior management approval and a valid business justification.
40. What are your views on usage of social media in office?
TIP: Keep an open mind with these kinds of questions.
Social media is acceptable, just ensure content filtering is enabled and uploading features are restricted. Read-only mode is acceptable till the time it does not interfere with work.
41. What are the various ways by which the employees are made aware about information security policies and procedures?
There can be various ways in which this can be done:
Employees should undergo mandatory information security training post joining the organisation. This should also be done on yearly basis, and this can be either a classroom session followed by a quiz or an online training.
Sending out notifications on regular basis in the form of slides, one-pagers, etc. to ensure that the employees are kept aware.
42. In a situation where both Open source software and licensed software are available to get the job done. What should be preferred and why?
TIP: Think from a security perspective and not from the functionality point.
For an enterprise, it is better to go for the licensed version of the software as most of the software have an agreement clause that the software should be used for individual usage and not for commercial purpose. Plus, the licensed version is updated and easy to track in an organization. It also helps the clients develop confidence in the organizations’ software and practices.
43. When should a security policy be revised?
There is no fixed time for reviewing the security policy but all this should be done at least once a year. Any changes made should be documented in the revision history of the document and versioning. In case there are any major changes the changes need to be notified to the users as well.
44. What all should be included in a CEO level report from a security standpoint?
A CEO level report should have not more than 2 pages:
A summarized picture of the state of the security structure of the organization.
Quantified risk and ALE (Annual Loss Expectancy) results along with countermeasures.
45. How do you report risks?
Risk can be reported but it needs to be assessed first. Risk assessment can be done in 2 ways: Quantitative analysis and qualitative analysis. This approach will cater to both technical and business guys. The business guy can see a probable loss in numbers whereas the technical guys will see the impact and frequency. Depending on the audience, the risk can be assessed and reported.
46. What is an incident and how do you manage it?
Any event which leads to compromise of the security of an organization is an incident. The incident process goes like this:
Identification of the Incident
Logging it (Details)
Investigation and root cause analysis (RCA)
Escalation or keeping the senior management/parties informed
47. Is social media secure?
TIP: This is another debatable question but be generic.
Not sure if the data is secure or not but users can take steps from their end to ensure safety.
Connect with trusted people
Do not post/upload confidential information
Never use the same username password for all accounts
48. Chain of custody?
For legal cases the data/device (evidence) needs to be integrated, hence any access needs to be documented – who, what when, and why. Compromise in this process can cause legal issues for the parties involved.