How Malware Can Cause Data Breaches

Malware & Data Breaches

In today’s digital age, data breaches have become increasingly common, and they can have devastating consequences for both individuals and organizations. Malware, or malicious software, is a primary culprit behind these breaches. This blog post aims to explore the relationship between malware and data breaches and how malware can compromise sensitive information.

Definition of Malware

First, let’s define what we mean by malware. Malware refers to any software designed to damage or disrupt computer systems, steal data, or gain unauthorized access to sensitive information. Malware can take many different forms, including viruses, worms, Trojan horses, and ransomware. Once installed on a computer, malware can be used to spy on users, steal data, or even take complete control of the system.

Malware Cases are Increasing

The SonicWall Cyber Threat Report 2021 shows that there were more than 304 million attempted malware attacks in 2020. This number represents a 62% increase from the previous year. The report also reveals that ransomware attacks increased by 62% in 2020, while encrypted threats, such as phishing attacks based on HTTPS, grew by 27%.

Moreover, a report by Cybersecurity Ventures predicts that the global damages caused by cybercrime will reach $10.5 trillion by 2025, which is up from $3 trillion in 2015. Malware attacks are a significant contributor to these damages. Ransomware attacks alone are projected to cost businesses and individuals $20 billion by 2021.

Clearly, malware attacks have become more prevalent in recent years, causing significant losses and damages to individuals and businesses worldwide. It’s, therefore, essential to take necessary measures to protect against these attacks and prevent them from happening in the first place.

Types of Malware

Malware is a term used to describe software that is intended to harm computer systems or gain unauthorized access to data. It is a serious threat to individuals, businesses, and organizations, as it can lead to financial losses, data breaches, and other detrimental effects. This article aims to delve into the various types of malware and their defining features.


A computer virus is a type of malware that is designed to infect and damage a computer system. When a virus enters a computer, it attaches itself to other files on the system and replicates itself when those files are opened or executed. This can lead to widespread infection, with the virus spreading to other computers on the network.


A Trojan horse, commonly known as a Trojan, is a type of malicious software that can cause severe harm to a computer system. It disguises itself as a legitimate program or file to deceive the user, making it difficult to detect. Once executed, the Trojan can release malicious code that steals sensitive data or damages the system.


Worms are a type of malicious software that can cause serious damage to computer networks and systems. They can spread quickly and replicate themselves without user intervention, making them difficult to contain and eradicate.


Common Ways Malware Can Enter a System

Malware poses a serious threat to computer systems, and there are several ways it can enter a system. This post will discuss the common ways malware can enter a system and offer tips on how individuals and organizations can safeguard themselves from malware attacks.

  • Phishing emails are a common way for malware to enter a system. Attackers send fraudulent emails that look like they are from reputable sources, such as banks or financial institutions. They encourage users to click on links or download attachments that contain malware. To stay safe, it’s important to be cautious about opening emails from unknown or suspicious sources, and avoid clicking on links or downloading attachments unless you are sure they are legitimate.
  • Malvertising is another way malware can enter a system. Attackers use online advertising networks to display ads containing malware, often disguised as legitimate ads. Users who click on these ads unknowingly download the malware. To reduce the risk of infection, it’s advisable to use ad-blocking software and avoid clicking on online ads unless you are confident they are legitimate.
  • Malicious downloads are a common way for malware to enter a system. Attackers distribute malware disguised as legitimate software through file-sharing networks and websites. Users who download and install the software unknowingly install the malware. To protect against malicious downloads, it’s important to only download software from reputable sources and scan all downloaded files with anti-malware software.
  • Unsecured networks, such as public Wi-Fi networks, are another way that malware can enter a system. Attackers can intercept data transmitted over these networks and inject malware into the data stream. To stay safe on public Wi-Fi networks, avoid sensitive transactions such as online banking and use a virtual private network (VPN) to encrypt your data.

How Malware Causes Data Breaches

Malware attacks are a significant threat to individuals, businesses, and organizations. They can result in financial losses, data breaches, and other damages. In this blog post, we will explore how malware can cause data breaches and the different types of malware used in these attacks.


Keylogging is a type of malware that can be used by cybercriminals to obtain sensitive information such as login credentials, credit card numbers, and personal identification numbers (PINs). Keyloggers work by capturing every keystroke made on the infected system, storing the information in a log file, and then transmitting that file to the attacker. Keyloggers can be installed on a system in various ways, such as through phishing emails, malicious downloads, or unsecured networks.

Once a keylogger has been installed on a system, it can capture every keystroke made by the user, including passwords, credit card numbers, and other sensitive information. This can allow the attacker to gain access to online accounts, steal personal information, or commit identity theft.

Keyloggers can be difficult to detect, as they operate in the background and do not typically show up as a visible program or process. However, there are some signs that may indicate the presence of a keylogger on a system, such as:

  • Unusual system behavior, such as slow performance or frequent crashes.
  • Suspicious network activity, such as unusual data transfers or connections to unfamiliar IP addresses.
  • Missing or altered files, such as log files or system files.

To protect against keylogging attacks, individuals and organizations should take the following precautions:

  • Use antivirus and anti-malware software to detect and remove keyloggers and other malicious software.
  • Keep software and operating systems up-to-date with the latest security patches.
  • Use strong passwords and two-factor authentication to protect online accounts.
  • Be cautious when downloading and installing software or opening email attachments, especially from unknown or suspicious sources.
  • Use a virtual keyboard or password manager to enter sensitive information, as keyloggers cannot capture keystrokes from these sources.

Screen Recording

Screen recording malware is a type of malicious software that can be installed on a victim’s device without their knowledge. Once installed, it records every action taken on the victim’s screen, including keystrokes, mouse clicks, and sensitive information.

Attackers can use screen recording malware to capture a variety of sensitive data, such as login credentials, banking information, and confidential documents. This information can be used for nefarious purposes, including identity theft and financial fraud.

Screen recording malware can be difficult to detect because it operates in the background without the victim’s knowledge. It can be installed through various methods, including phishing emails and malicious downloads.

To protect against screen recording malware, users should take the following precautions:

  • Avoid clicking on suspicious links or downloading files from untrusted sources.
  • Keep anti-malware software up to date and perform regular scans.
  • Use strong and unique passwords for all accounts.
  • Enable two-factor authentication whenever possible.
  • Use a privacy screen filter to prevent unauthorized viewing of the screen.
  • Monitor bank and credit card statements regularly for unauthorized activity.

Remote Access Trojan (RATs) 

Remote Access Trojans (RATs) are a type of malware that can give attackers complete control over an infected system from a remote location. These Trojans are especially dangerous because they can allow attackers to access sensitive data and even use the infected computer as a launch pad for further attacks.

Here are some ways in which RATs can cause data breaches:

  • Stealing sensitive data: Attackers can use RATs to gain access to sensitive information such as login credentials, financial data, and personal information stored on the infected system. They can then steal this information and use it for various malicious purposes.
  • Installing additional malware: Once attackers have gained control of an infected system, they can use it to download and install additional malware, such as keyloggers, screen recorders, and other types of malware that can steal sensitive information.
  • Planting backdoors: Attackers can use RATs to plant backdoors on an infected system, which can allow them to continue to access the system even after the initial infection has been detected and removed. This can give attackers ongoing access to sensitive data.
  • Ransomware attacks: Attackers can use RATs to install ransomware on an infected system. Ransomware encrypts the victim’s files and demands payment in exchange for the decryption key. This can result in the victim losing access to critical data and files, causing significant financial and operational damage.

Organizations can also consider implementing the following practices to mitigate the risk of RAT attacks:

  • Network segmentation: Segregating networks into smaller segments can help prevent the spread of malware and limit the scope of a potential attack.
  • Access controls: Enforcing strict access controls can limit the ability of attackers to move laterally within a network and access sensitive data.
  • Endpoint security: Implementing endpoint security solutions such as firewalls, intrusion detection/prevention systems, and malware protection can help protect against RATs and other types of malware.
  • Employee education: Regularly educating employees on the risks of RATs and other types of malware, including how to identify and avoid phishing emails and suspicious downloads, can help prevent these types of attacks from being successful.

Data Exfiltration

Data exfiltration refers to the unauthorized transfer of data from a system or network. Malware can be used as a tool to exfiltrate sensitive data from a compromised system, allowing attackers to steal valuable information without being detected.

  • Data theft: Malware can be designed to search for and steal sensitive data such as credit card information, social security numbers, and other personally identifiable information. Attackers can then use this information for identity theft or financial fraud.
  • Uploading to a remote server: Malware can be programmed to upload stolen data to a remote server controlled by the attacker. This allows attackers to access the stolen data from anywhere in the world and use it for malicious purposes.
  • Using file transfer protocols: Malware can use various file transfer protocols such as FTP or HTTP to send stolen data to a remote server or download additional malware.
  • Using command and control servers: Malware can be designed to communicate with command and control (C&C) servers controlled by attackers. Attackers can use these servers to send commands to the malware and receive stolen data.
  • Encrypted data exfiltration: Some malware can encrypt the stolen data before exfiltrating it, making it more difficult for security tools to detect and prevent data exfiltration.

Data exfiltration is a serious threat to individuals and organizations, as it can result in significant financial losses, reputational damage, and legal consequences. Therefore, it is essential to take proactive measures to prevent malware infections and detect data exfiltration attempts. Here are some best practices that can help prevent data exfiltration:

  • Implement robust antivirus software and keep it up-to-date: Antivirus software can detect and block many types of malware, including those designed for data exfiltration. Keeping antivirus software up-to-date is crucial as new threats emerge regularly.
  • Regularly scan systems and networks for malware infections: Regular scans can help detect malware infections early, allowing security teams to respond before data is exfiltrated.
  • Enforce strong password policies and two-factor authentication: Strong passwords and two-factor authentication can help prevent unauthorized access to sensitive data and systems.
  • Provide security awareness training to employees: Educating employees on how to recognize and avoid phishing attacks, social engineering, and other malware delivery methods can help prevent malware infections.
  • Implement network segmentation and access controls: Network segmentation can help limit the spread of malware in the event of a breach, and access controls can prevent unauthorized access to sensitive data and systems.
  • Monitor network traffic for anomalies and suspicious activity: Monitoring network traffic for signs of data exfiltration, such as large amounts of data leaving the network, can help detect and prevent data exfiltration attempts.


Malware can cause significant data breaches by stealing sensitive information, recording screens, providing remote access, and exfiltrating data. These attacks can lead to devastating consequences for individuals and organizations, including financial losses, reputational damage, and legal repercussions. 

Therefore, it is crucial to take necessary steps to protect against malware attacks, such as implementing robust security measures, keeping software up-to-date, and providing regular security awareness training to employees. By taking proactive measures, individuals and organizations can mitigate the risk of malware-based data breaches and protect their sensitive information from being compromised.

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