Week 1
Viruses and Malicious Code
Week 1
What Is Malicious Code?
Answer the following question
Week 1
By the end of this resource, you will be able to identify the main types of malicious code and understand how they affect the security of information systems, as well as the basic measures used to prevent cyberattacks.
Today, organizations rely on digital systems to store information, carry out operations, and communicate. However, these systems can be compromised by different types of malicious code designed to damage, alter, or steal information.
Understanding how these threats operate makes it possible to recognize risks, strengthen protection measures, and reduce vulnerabilities within digital environments.
Viruses and other types of malware represent one of the most common threats in cybersecurity, as they can affect computers, mobile devices, networks, and online services.
What Is Malicious Code?
Malicious code, or malware, is a program designed to infiltrate, damage, alter, or gain unauthorized access to a computer system.
Its purpose may include:
Malicious code can enter a system through:
Click on the icons to get more information.
Main Types of Malicious Code
Analyze the following scenarios and review the information about each type of code to find the answer.
Virus
Scenario: Laura opens a Word document sent to her through WhatsApp. The next day, several of her files will not open and display the same error. The problem is only on her computer. What key characteristic reveals it as a virus and not a worm?
Worms
Scenario: On Monday morning, the IT department receives reports of 30 computers experiencing extreme slowness. No one installed anything new. The corporate network is saturated. Why does this point to a worm rather than a virus?
Trojans
Scenario: Carlos downloads a free video editing application. He installs it without any issues. Weeks later, they discover that someone accessed his computer remotely from outside. At what moment did the attack actually occur?
Spyware
Scenario: Sofía notices that someone is using her passwords even though she never shared them. Her computer works normally, and there are no damaged files. Why is spyware especially difficult to detect?
Click on the icons to get more information.
Risks of Malicious Code
Malware attacks can cause:
In organizations, these threats can affect critical operations and compromise business continuity.
Basic Protection Measures
To reduce risks associated with malicious code, it is recommended to:
Answer the following question
Conclusion
Viruses and malicious code represent significant threats to information systems and digital security. Understanding their characteristics and methods of propagation helps identify risks and strengthen protection measures in both personal and organizational environments.Cybersecurity does not depend solely on technological tools, but also on responsible practices and user awareness.
Go Ahead!
Reference:
Stallings, W. (2018). Network Security Essentials: Applications and Standards, Global Edition (6th ed.). Pearson International Content. https://full-bookshelf.vitalsource.com/books/9781292154916
It is a Trojan Horse. It did not need to force its way in; it asked you to install it voluntarily using an urgent excuse.It is not a virus because it is not described as infecting other files or replicating automatically. The main danger lies in deceiving the user into installing it voluntarily, which is a typical characteristic of a Trojan Horse.That is exactly what defines it. Now you would recognize it.
Worms
Worms are programs capable of spreading automatically through networks without requiring user interaction.Main characteristics:
- Replicate rapidly
- Consume network resources
- Can affect multiple devices simultaneously
Feedback: Automatic propagation without user intervention and the simultaneous impact on multiple devices are the signature characteristics of a worm. It spread through the network on its own.
Troyans
A Trojan horse appears to be a legitimate program but contains hidden malicious functions.Main characteristics:
- Tricks the user into installing it
- Allows unauthorized access
- Can steal information or install additional malware
Feedback: When Carlos voluntarily installed something that appeared legitimate. A Trojan does not need to trick the system; it tricks you into installing it yourself.
Spyware
Spyware is software designed to collect user information without consent.Main characteristics:
- Monitors activity
- Records passwords or browsing habits
- Can compromise privacy
Feedback: Because it does not visibly damage anything; it only observes and collects information. Its goal is not to destroy, but to spy without you noticing.
Virus
A virus is a program that attaches itself to legitimate files or programs in order to spread and affect the operation of a system.Main characteristics:
- Requires activation through file execution
- Can modify or delete information
- Replicates within the system
Feedback: The virus needed Laura to open the file in order to activate, and the damage remained on her computer. A worm does not require that action and would have spread to other devices on the network.
It is a Trojan Horse. It did not need to force its way in; it asked you to install it voluntarily using an urgent excuse.It is not a virus because it is not described as infecting other files or replicating automatically. The main danger lies in deceiving the user into installing it voluntarily, which is a typical characteristic of a Trojan Horse.That is exactly what defines it. Now you would recognize it.
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Transcript
Week 1
Viruses and Malicious Code
Week 1
What Is Malicious Code?
Answer the following question
Week 1
By the end of this resource, you will be able to identify the main types of malicious code and understand how they affect the security of information systems, as well as the basic measures used to prevent cyberattacks.
Today, organizations rely on digital systems to store information, carry out operations, and communicate. However, these systems can be compromised by different types of malicious code designed to damage, alter, or steal information.
Understanding how these threats operate makes it possible to recognize risks, strengthen protection measures, and reduce vulnerabilities within digital environments.
Viruses and other types of malware represent one of the most common threats in cybersecurity, as they can affect computers, mobile devices, networks, and online services.
What Is Malicious Code?
Malicious code, or malware, is a program designed to infiltrate, damage, alter, or gain unauthorized access to a computer system.
Its purpose may include:
Malicious code can enter a system through:
Click on the icons to get more information.
Main Types of Malicious Code
Analyze the following scenarios and review the information about each type of code to find the answer.
Virus
Scenario: Laura opens a Word document sent to her through WhatsApp. The next day, several of her files will not open and display the same error. The problem is only on her computer. What key characteristic reveals it as a virus and not a worm?
Worms
Scenario: On Monday morning, the IT department receives reports of 30 computers experiencing extreme slowness. No one installed anything new. The corporate network is saturated. Why does this point to a worm rather than a virus?
Trojans
Scenario: Carlos downloads a free video editing application. He installs it without any issues. Weeks later, they discover that someone accessed his computer remotely from outside. At what moment did the attack actually occur?
Spyware
Scenario: Sofía notices that someone is using her passwords even though she never shared them. Her computer works normally, and there are no damaged files. Why is spyware especially difficult to detect?
Click on the icons to get more information.
Risks of Malicious Code
Malware attacks can cause:
In organizations, these threats can affect critical operations and compromise business continuity.
Basic Protection Measures
To reduce risks associated with malicious code, it is recommended to:
Answer the following question
Conclusion
Viruses and malicious code represent significant threats to information systems and digital security. Understanding their characteristics and methods of propagation helps identify risks and strengthen protection measures in both personal and organizational environments.Cybersecurity does not depend solely on technological tools, but also on responsible practices and user awareness.
Go Ahead!
Reference:
Stallings, W. (2018). Network Security Essentials: Applications and Standards, Global Edition (6th ed.). Pearson International Content. https://full-bookshelf.vitalsource.com/books/9781292154916
It is a Trojan Horse. It did not need to force its way in; it asked you to install it voluntarily using an urgent excuse.It is not a virus because it is not described as infecting other files or replicating automatically. The main danger lies in deceiving the user into installing it voluntarily, which is a typical characteristic of a Trojan Horse.That is exactly what defines it. Now you would recognize it.
Worms
Worms are programs capable of spreading automatically through networks without requiring user interaction.Main characteristics:
- Replicate rapidly
- Consume network resources
- Can affect multiple devices simultaneously
Feedback: Automatic propagation without user intervention and the simultaneous impact on multiple devices are the signature characteristics of a worm. It spread through the network on its own.Troyans
A Trojan horse appears to be a legitimate program but contains hidden malicious functions.Main characteristics:
- Tricks the user into installing it
- Allows unauthorized access
- Can steal information or install additional malware
Feedback: When Carlos voluntarily installed something that appeared legitimate. A Trojan does not need to trick the system; it tricks you into installing it yourself.Spyware
Spyware is software designed to collect user information without consent.Main characteristics:
- Monitors activity
- Records passwords or browsing habits
- Can compromise privacy
Feedback: Because it does not visibly damage anything; it only observes and collects information. Its goal is not to destroy, but to spy without you noticing.Virus
A virus is a program that attaches itself to legitimate files or programs in order to spread and affect the operation of a system.Main characteristics:
- Requires activation through file execution
- Can modify or delete information
- Replicates within the system
Feedback: The virus needed Laura to open the file in order to activate, and the damage remained on her computer. A worm does not require that action and would have spread to other devices on the network.It is a Trojan Horse. It did not need to force its way in; it asked you to install it voluntarily using an urgent excuse.It is not a virus because it is not described as infecting other files or replicating automatically. The main danger lies in deceiving the user into installing it voluntarily, which is a typical characteristic of a Trojan Horse.That is exactly what defines it. Now you would recognize it.