Introduction to Security · ⁨보안 소개⁩

Learning Objective 1.1.A: Identify common indicators of social engineering tactics.

• 1.1.A.1 Social engineering attacks employ psychological tactics to manipulate users into revealing sensitive information (elicitation), downloading a malicious file, or clicking on a malicious link. Social engineering can be performed in person but is often done by email, by text message, or through social media messages.
• 1.1.A.2 Adversaries often use psychological tactics like intimidation and urgency to achieve their goals. Intimidation is when an adversary threatens a target with negative consequences if they don’t comply. Urgency is when an adversary creates reasons why a target should act quickly.

Learning Objective 1.1.B: Explain how social engineering tactics influence victims to perform a desired action.

• 1.1.B.1 Social engineering tactics rely on common psychological principles that influence human behavior.
• 1.1.B.2 Intimidation leverages a natural human aversion to negative consequences. By drawing attention to possible negative consequences, adversaries use fear to incite targets to act.
• 1.1.B.3 Urgency leverages a natural human response to react quickly to time-sensitive needs. When targets detect a sense of urgency in a message, they feel pressured to respond or act quickly, which can prevent them from taking the time to consider whether an action is reasonable or safe.

Learning Objective 1.1.C: Describe possible impacts for victims of social engineering attacks.

• 1.1.C.1 Victims may give an adversary personal information that could lead to impersonation, such as name, phone number, address, workplace, pets’ names, or birthdate. These types of information, and information like them, are often used on websites as challenge questions to verify a user’s identity.
• 1.1.C.2 Victims may give an adversary secure information like a one-time password (OTP) or authentication login code, which could allow an adversary to log in to a service as the victim.
• 1.1.C.3 Victims may download malware or click a link that installs malware on their device, steals information from their web browser, or directs them to a website where their login credentials can be captured by an adversary.

Learning Objective 1.2.A: Identify common signs of a password attack.

• 1.2.A.1 In an online password attack, adversaries try logging in to a device or service using common passwords, common password patterns, or stolen passwords.
• 1.2.A.2 Signs of an online password attack include:
  • Many failed attempts to log in over a short duration
  • Login attempts at unusual times
  • Login attempts from unknown devices

Learning Objective 1.2.B: Explain how adversaries take advantage of weak authentication.

• 1.2.B.1 Many people use common patterns when creating passwords, such as:
  • Starting a password with one or two words, adding a two-digit number (often signifying a year), and putting a special character at the end
  • Including the names of family or pets in their passwords
  • Including personally significant dates in their passwords
• 1.2.B.2 Adversaries often construct a dictionary of possible passwords based on personal information gathered about a target (e.g., birthday, anniversary, names of pets and family) and use an automated tool to submit potential passwords.

Learning Objective 1.2.C: Explain how to make authentication stronger.

• 1.2.C.1 Users should create passwords that are long, random, and unique. A password manager can be used to generate and store strong passwords, or a user may create long, unique passphrases for their accounts.
• 1.2.C.2 When creating passwords, users should avoid names, dates, or other personally meaningful words or numbers.
• 1.2.C.3 When available, users should enable multifactor authentication (MFA), which will require the user to provide extra proof of identity—such as a one-time code—in addition to the password as an extra layer of security.

Learning Objective 1.3.A: Identify the type of adversary conducting a cyberattack.

• 1.3.A.1 Adversaries can be classified by their skill levels.
  • Low-skilled adversaries rely on malicious cyber tools created by others that can be purchased online. The tools they use exploit known vulnerabilities.
  • High-skilled adversaries have the capacity to create new malicious cyber tools or modify existing ones to adapt to new defensive techniques and tools. They also have the capacity to discover undocumented vulnerabilities, known as zero days.
• 1.3.A.2 Adversaries have a variety of motivations, including greed, desire for recognition, dedication to a cause, revenge, politics, or beliefs.

Learning Objective 1.3.B: Identify types of wireless cyberattacks.

• 1.3.B.1 In an evil twin attack, an adversary sets up their own wireless access point (WAP) with a service set identifier (SSID) similar or identical to a target network; the adversary’s network is called the evil twin. Victims of this attack could select to unknowingly connect to the evil twin, allowing the adversary to capture their network traffic. The adversary cannot read traffic that uses an encrypted protocol like HTTPS.
• 1.3.B.2 In a jamming attack, an adversary floods an area with a strong electromagnetic (EM) signal in the same frequency range as the wireless network, which prevents legitimate traffic between the access point (AP) and users. This type of attack that prevents users from accessing resources is called a denial of service (DoS) attack.
• 1.3.B.3 In a war driving attack, adversaries try to detect wireless network beacons while driving or walking around a target. If a wireless signal is detected, the adversary can gather information about the type of wireless network used and find areas where the wireless signal extends outside the physical building.

Learning Objective 1.3.C: Describe actions individuals can take to increase protection of sensitive data when using the internet and Wi-Fi.

• 1.3.C.1 Individuals should verify that the name of any wireless network they join exactly matches the name of the network they intend to join.
• 1.3.C.2 Most internet protocols are encrypted to protect network traffic. However, individuals may consider the sensitivity of their data in choosing whether to join unencrypted Wi-Fi networks to protect vulnerable data such as DNS queries.
• 1.3.C.3 Individuals may consider using a virtual private network (VPN), which encrypts all their traffic to the VPN operator’s system. Although this action prevents a service provider from viewing traffic, the VPN provider can view the traffic.

Learning Objective 1.4.A: Explain how adversaries use AI-powered tools to augment cyberattacks.

• 1.4.A.1 Adversaries can use AI-powered tools that leverage existing voice and image samples of a person to create a digital avatar of that person. The use of these technologies enables adversaries to impersonate someone over the phone or even on a video call, which can lead to financial loss or the sharing of sensitive or private information. As more organizations adopt voice-based authentication, the impact of voice-impersonation has a larger potential impact.
• 1.4.A.2 Adversaries can use generative AI tools, like large language models (LLMs), to create convincing phishing messages in any target language. Because traditional phishing messages are sometimes written by non-native speakers of the target’s language, unnatural language is a feature that has been used to distinguish phishing messages from legitimate messages. However, with AI tools, adversaries can now craft phishing messages in any language that read as though they were written by a native speaker.
• 1.4.A.3 Adversaries can craft prompts that extract secure or sensitive information from LLMs. Secure or sensitive information in LLMs can come from user input and the large data sets used to train LLMs.
• 1.4.A.4 Adversaries can publish websites or modify existing websites to contain false information so that the false information will be included in the training sets for LLMs, causing the LLMs to repeat the false information.
• 1.4.A.5 Adversaries can perform reconnaissance on a target using AI-powered tools that scan the internet to gather information posted on social media and public websites.
• 1.4.A.6 Adversaries can use AI-enhanced coding tools to help them write new malware, modify existing application code to perform malicious activities, or to find vulnerabilities in large code bases.

Learning Objective 1.4.B: Explain how to protect against some AI-augmented cyberattacks.

• 1.4.B.1 Shared secrets with close friends and relatives that can be used to verify each other’s identities should be established. A secret word or phrase known only to two parties can be used to authenticate identities in high-stakes situations.
• 1.4.B.2 Multifactor authentication (MFA) should be enabled. If an adversary clones a target’s voice to access a system with voice authentication, requiring a second authentication factor could prevent an adversary from gaining access to accounts.
• 1.4.B.3 Personal or sensitive data should not be entered into any AI-powered tools, such as chatbots or virtual assistants. Some AI-powered tools feed user input back into the model to provide continuous training. Adversaries could extract data that users have included in prompts.
• 1.4.B.4 Output from AI-powered tools should be carefully evaluated. Verify information from AI-powered tools using reputable, stable, non-AI-based sources.

Learning Objective 1.5.A: Explain how cyber defenders can leverage AI-powered tools to protect networks, applications, and data.

• 1.5.A.1 AI tools can review current security configurations, like firewall rules and access controls, and recommend more secure options. Recommendations should always be checked by a knowledgeable security technician before being implemented.
• 1.5.A.2 AI-powered tools can analyze application code to identify vulnerabilities and recommend mitigations. Recommendations should always be reviewed by a knowledgeable programmer before being implemented.
• 1.5.A.3 AI-powered tools can suggest rules for automated detection systems. Detection rules should always be reviewed by a knowledgeable detection engineer before being added to a system.

Learning Objective 1.5.B: Explain how AI-powered tools are enabling faster and more accurate threat detection and response.

• 1.5.B.1 Of the millions of digital events that happen on networks daily, some likely represent an adversary conducting malicious activity. Humans cannot carefully examine all those events to identify the malicious activity.
• 1.5.B.2 AI-powered tools can be trained to quickly analyze digital events and sort the events that are likely malicious activity from those that are harmless.
• 1.5.B.3 AI-powered tools can be programmed to alert human cybersecurity personnel when likely malicious activity is detected or to take specific corrective actions based on the type of malicious activity detected.
• 1.5.B.4 AI-powered tools enable threat-detection and response teams to catch malicious activity and intervene quickly to prevent loss, harm, damage, and destruction to digital infrastructure and data.