Threat hunting techniques in Cybersecurity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is threat hunting in cybersecurity?

Threat hunting is the proactive search for hidden cyber threats or attackers within a network before they cause harm or are detected by automated tools.

beginner

Name a common technique used in threat hunting that involves analyzing unusual patterns in network traffic.

Anomaly detection is a common technique where hunters look for unusual patterns or behaviors in network traffic that may indicate malicious activity.

intermediate

What role does hypothesis-driven hunting play in threat hunting?

Hypothesis-driven hunting involves forming educated guesses about potential threats based on knowledge of attacker behaviors, then searching for evidence to confirm or refute those guesses.

intermediate

How does threat hunting differ from traditional security monitoring?

Traditional security monitoring relies on automated alerts and known signatures, while threat hunting is proactive and looks for unknown or hidden threats by analyzing data and behaviors.

beginner

Why is endpoint data important in threat hunting?

Endpoint data provides detailed information about activities on devices like computers and servers, helping hunters detect suspicious actions such as unauthorized access or malware execution.

Which of the following best describes threat hunting?

A Proactively searching for hidden threats

B Installing antivirus software

C Waiting for alerts from security tools

D Backing up data regularly

Threat hunting is about actively looking for threats that automated tools might miss.

What is anomaly detection used for in threat hunting?

A To detect unusual patterns that may indicate threats

B To find normal network behavior

C To update software automatically

D To block all network traffic

Anomaly detection helps identify unusual activities that could be signs of an attack.

Hypothesis-driven hunting means:

A Ignoring alerts from security tools

B Randomly scanning all files

C Guessing potential threats and searching for evidence

D Only reacting to known malware

Hunters form educated guesses about threats and then look for proof.

Which data source is most useful for detecting suspicious activity on devices?

A Financial statements

B Public social media posts

C Weather reports

D Endpoint data

Endpoint data shows what is happening on computers and servers, crucial for threat hunting.

How does threat hunting complement traditional security monitoring?

A By replacing all automated tools

B By proactively finding threats that automated tools miss

C By ignoring network traffic

D By only focusing on backups

Threat hunting looks deeper and finds hidden threats beyond automated alerts.

Explain the main steps involved in a hypothesis-driven threat hunting process.

Think about how hunters guess and then check for threats.

Describe why endpoint data is critical for effective threat hunting.

Consider what information devices can reveal about attacks.

Practice

1. What is the main goal of threat hunting in cybersecurity?

easy

A. To create strong passwords for users

B. To install antivirus software on all computers

C. To block all internet access to prevent attacks

D. To actively search for hidden cyber threats before they cause damage

Solution

1. Step 1: Understand the purpose of threat hunting

   Threat hunting is about proactively looking for threats that may not be detected by automated tools.

2. Step 2: Compare options to the goal

   Installing antivirus, creating passwords, or blocking internet are preventive or reactive, not active searching.

3. Final Answer:

   To actively search for hidden cyber threats before they cause damage -> Option D

4. Quick Check:

   Threat hunting = active search [OK]

Hint: Threat hunting means actively looking for hidden threats [OK]

Common Mistakes:

• Confusing threat hunting with installing security software
• Thinking threat hunting is only about blocking access
• Believing it is about password management

2. Which of the following is a common technique used in threat hunting?

easy

A. Ignoring network logs

B. Waiting for alerts from antivirus software

C. Forming hypotheses about attacker behavior

D. Disabling firewalls to reduce false alarms

Solution

1. Step 1: Identify common threat hunting methods

   Threat hunting often starts with forming hypotheses about how attackers might behave.

2. Step 2: Evaluate each option

   Waiting for alerts is reactive, ignoring logs or disabling firewalls harms security, so only forming hypotheses fits.

3. Final Answer:

   Forming hypotheses about attacker behavior -> Option C

4. Quick Check:

   Hypothesis formation = key hunting step [OK]

Hint: Threat hunting starts with guessing attacker actions [OK]

Common Mistakes:

• Thinking threat hunting is passive waiting
• Ignoring important data sources like logs
• Reducing security tools to avoid alerts

3. Consider this simplified threat hunting step: if suspicious_activity_detected and data_source == 'network_logs': alert(). What happens if suspicious activity is found in network logs?

medium

A. An alert is generated

B. No alert is generated

C. The system shuts down

D. Data source is ignored

Solution

1. Step 1: Understand the condition in the code

   The code triggers alert() only if suspicious_activity_detected is true and data_source equals 'network_logs'.

2. Step 2: Analyze the scenario

   If suspicious activity is found in network logs, both conditions are true, so alert() runs.

3. Final Answer:

   An alert is generated -> Option A

4. Quick Check:

   Conditions met = alert triggered [OK]

Hint: Alert triggers when suspicious activity is in network logs [OK]

Common Mistakes:

• Assuming no alert without checking both conditions
• Confusing alert with system shutdown
• Ignoring the data source condition

4. A threat hunter wrote this pseudocode: if event_type = 'login_failure' then investigate(). What is wrong with this code?

medium

A. The assignment operator '=' is used instead of comparison '=='

B. The function investigate() is missing parentheses

C. The event_type variable is undefined

D. The condition should check for 'login_success' instead

Solution

1. Step 1: Identify the operator used in the condition

   The code uses '=' which usually means assignment, not comparison.

2. Step 2: Understand correct syntax for comparison

   To check equality, '==' should be used, so the condition properly tests event_type.

3. Final Answer:

   The assignment operator '=' is used instead of comparison '==' -> Option A

4. Quick Check:

   Use '==' for comparison, not '=' [OK]

Hint: Use '==' to compare, '=' assigns value [OK]

Common Mistakes:

• Confusing '=' with '==' in conditions
• Assuming function syntax error without checking operators
• Changing condition logic unnecessarily

5. You want to improve threat hunting by combining multiple data sources. Which approach best helps find hidden threats?

hard

A. Use only firewall logs to reduce data volume

B. Form hypotheses and analyze data from network, endpoint, and user activity logs

C. Ignore user activity logs because they are noisy

D. Rely solely on automated alerts without manual analysis

Solution

1. Step 1: Understand the benefit of multiple data sources

   Using diverse data like network, endpoint, and user logs gives a fuller picture of threats.

2. Step 2: Evaluate approaches for effective threat hunting

   Forming hypotheses and analyzing multiple sources is proactive and thorough, unlike ignoring data or relying only on alerts.

3. Final Answer:

   Form hypotheses and analyze data from network, endpoint, and user activity logs -> Option B

4. Quick Check:

   Multiple data sources + hypotheses = better hunting [OK]

Hint: Combine data sources and hypotheses for best results [OK]

Common Mistakes:

• Using only one data source limits threat visibility
• Ignoring noisy data that can hold clues
• Relying only on automated alerts misses hidden threats