Did you know that cyberattacks are becoming increasingly frequent and sophisticated, putting organizations of all sizes at risk?
Those who believe only large corporations are targeted are mistaken: any organization connected to the internet can fall victim to these digital threats. Ransomware, phishing, DDoS, and other types of cyberattacks are already part of the daily reality for those working with technology — yet many still underestimate the true dangers and warning signs of an active attack.
In this article, we explain what cyberattacks are, highlight the most common types, and show how to identify whether your company is in the crosshairs of cybercriminals. You will also discover effective solutions to protect your data and ensure business continuity, backed by ACTAR’s expertise in digital security.
What is a cyberattack?
A cyberattack is a malicious attempt to gain unauthorized access to computer systems in order to steal, modify, or destroy data. It is an action carried out by hackers or digital criminals with the goal of breaching, stealing, manipulating, or even destroying data and computer systems. These attacks aim to cause damage, seize control, or gain access to critical documents and systems across a computer network — whether personal or commercial.
Cyberattacks can be carried out by individuals or organizations driven by political, criminal, or personal motivations. They can range from installing spyware on a personal computer to attempting to destroy the infrastructure of entire nations. Cybercriminals use various methods to initiate an attack, including malware, phishing, and ransomware.
The goal of a cyberattack is to disable the target computer and take it offline, or to access its data and infiltrate connected networks and systems. As technology advances, so do the criminals’ methods — making these actions increasingly sophisticated.
See also: Inequality in Cyber Security and the Urgency for Resilient Measures
What are the types of cyberattacks?
Cyberattacks can take many forms, each with specific methods and objectives. Among the most common and dangerous types are:
Ransomware
A type of malware that encrypts the victim’s data and demands a ransom to restore access. The attack typically begins with malicious links in phishing emails or exploited system vulnerabilities.
Phishing
A social engineering technique that deceives users into revealing confidential information — such as passwords and banking credentials — through emails, messages, or fake websites that impersonate legitimate entities.
DoS and DDoS Attacks (Denial of Service)
These attacks aim to overwhelm systems, servers, or networks with excessive traffic, making them unavailable to legitimate users. In a DoS attack, the attack originates from a single computer; in a DDoS attack, thousands or millions of infected devices are used.
Malware
Malicious software that can include trojans, worms, spyware, and others, with the goal of stealing data, controlling devices, or causing damage.
Man-in-the-Middle (MitM) Attacks
The attacker intercepts and potentially alters communication between two parties without their knowledge, enabling the theft of sensitive information.
SQL Injection
Exploits vulnerabilities in web applications to insert malicious commands into the database, allowing unauthorized access to or manipulation of confidential information.
Social Engineering
Psychological manipulation used to trick victims into revealing information or performing actions that compromise security.
Beyond these, there are other types such as spear phishing (targeted attacks), whaling (focused on executives), smishing (via SMS), supply chain attacks, and threats linked to the Internet of Things (IoT) — all reflecting the growing complexity of the cyberattack landscape.
See also: The Importance of Cybersecurity for Critical Infrastructures and OTs
What are the main cyber threats today?
Considering this constantly evolving landscape, some of the most significant cyber threats today include:
Targeted Ransomware
Ransomware attacks are becoming more sophisticated and targeted, tailored to specific industries and organizations to maximize effectiveness. Criminals analyze the market to identify critical sectors and exploit sector-specific vulnerabilities.
Fileless Malware
Attacks that do not rely on files to infect systems — instead exploiting legitimate processes or system memory — making them difficult to detect with traditional security solutions.
Cyber Espionage
Attacks against governments and large corporations to steal strategic information, trade secrets, and sensitive data. These attacks are characterized by their sophistication and may remain undetected within a network for months or even years.
Attacks on Cryptocurrencies and Fintechs
The growing popularity of cryptocurrencies and fintechs makes these sectors prime targets for cybercriminals. Digital financial transactions open doors to sophisticated attacks that exploit vulnerabilities in emerging technologies.
Evasion Techniques
Cybercriminals attempt to bypass security solutions and remain undetected within corporate networks. Methods include code obfuscation, polymorphism, and the use of legitimate services for malicious activities.
Global Conflicts and Commercial Damage
Cyberattacks linked to geopolitical conflicts, with commercial entities being targeted as tactical and strategic objectives.
AI-Assisted Attacks
Artificial intelligence (AI) is used to create deepfakes, enhance social engineering, and automate attack tools.
Monolithic Vulnerabilities
Excessive dependence on the same technology supply chains creates vulnerabilities where a single compromised entity can trigger widespread disruption.
Smart Infrastructures as Targets
Cyberattacks against physical infrastructures, such as smart buildings and industrial facilities.
Cyberattacks in Brazil and worldwide
The global cyberattack landscape has deteriorated significantly, with an increase of approximately 50% in the volume of digital crimes in the first quarter of the year, totaling an average of 1,925 attacks per week, according to Check Point Research. In Brazil, this reality is even more alarming, particularly in the financial sector, which leads in attacks, accounting for 20.18% of incidents recorded between January and March 2025.
Attacks in Brazil are marked by the sophistication of malware, particularly banking trojans such as Spy.Guildma and Spy.Delf.RAY, which disguise themselves as legitimate programs to deceive users and steal sensitive information. Beyond the financial sector, governments, services, industry, commerce, and even sectors such as agriculture and energy are also in the crosshairs of cybercriminals, reflecting the expansion of risks driven by the digitalization of different areas.
At the global level, companies face billion-dollar losses due to cyberattacks. In Brazil alone, losses are estimated to reach R$ 2.2 trillion over the next three years, considering the impact of data breaches and the high probability of large-scale attacks. The growing use of artificial intelligence for both defense and attack further complicates the landscape, with 77% of Brazilian companies having already experienced AI-related incidents, although many still underestimate the risks.
This context reinforces the urgency of effective digital security strategies, continuous team training, and the adoption of advanced technologies to protect data and ensure business continuity in an environment increasingly threatened by cyberattacks.
Dangers of cyberattacks
Cyberattacks represent a growing threat to companies of all sizes, with losses that can reach alarming figures. The dangers of cyberattacks extend far beyond direct financial losses. They include:
Reputational damage
Security incidents can compromise the company’s image, generating distrust among clients and partners.
Operational disruption
Attacks such as ransomware can bring systems and processes to a halt, affecting productivity and the ability to deliver services.
Theft of sensitive data
Confidential information belonging to clients, employees, and the company itself can be exposed, giving rise to legal and financial liabilities.
Recovery costs
Recovering from a cyberattack can involve significant expenditure on specialized consulting, security software, and other corrective measures.
Loss of intellectual property
Research data, formulas, and other business secrets can be stolen, benefiting competitors.
Furthermore, small companies that suffer serious security breaches may face closure within six months. Political and social instability is also a risk factor, with cyberattacks increasingly linked to geopolitical conflicts.
The use of artificial intelligence to enhance attacks also increases the complexity of the landscape, making the adoption of robust protective measures and awareness of the risks absolutely essential.
How to tell if a company is under cyberattack?
Identifying that a company is being targeted by cyberattacks is critical to acting quickly and minimizing damage. Attacks are increasingly sophisticated, requiring close attention to signals that indicate possible intrusions or compromise attempts.
Some of the main signs that your company may be under cyberattack include:
Abnormal system performance
Sudden slowdowns, frequent crashes, or unexpected restarts may indicate the presence of malware or attackers taking control of devices.
Appearance of unknown software
Programs installed without authorization or that do not belong to the company’s standard environment.
Unusual network activity
Unexplained spikes in data traffic, unauthorized remote connections, or increased mobile data consumption.
Disabled security alerts
Antivirus, firewall, or other protection tools disabled without IT team intervention.
Unauthorized changes to systems and websites
Alterations to corporate website content, suspicious redirects, or warning messages in browsers.
Difficulty accessing accounts
Passwords that stop working or frequent failed login alerts.
Increase in unwanted or unauthorized outbound emails
A surge in spam or messages sent from corporate accounts without users’ knowledge.
File encryption or disappearance
Documents that vanish or become inaccessible — a possible sign of ransomware.
Strange device behavior
Mouse or keyboard moving on their own, unexpected pop-ups, and overheating without apparent cause.
Creation of unknown accounts
New users appearing in internal systems without IT team authorization.
Recognizing these signals quickly can prevent greater losses and ensure your company takes the necessary steps to contain the attack.
Adopting continuous monitoring, updated security policies, and specialized solutions — such as those offered by ACTAR — is essential to protect your business against increasingly advanced threats.
See also: Is your brand protected?
How to address cyberattacks with ACTAR’s support?
ACTAR offers comprehensive and customized solutions to protect your company against cyberattacks and minimize the impact should an incident occur. With an approach that combines advanced technology, continuous monitoring, and specialized expertise, ACTAR helps strengthen your business’s digital security on every front.
Among the key resources and services ACTAR provides to address cyberattacks are:
Continuous monitoring and proactive threat detection
ACTAR implements systems that identify attacks in real time, drastically reducing the time between intrusion and response — which is critical to preventing greater losses.
Intelligent cloud security solutions
With the growing adoption of multi-cloud environments, ACTAR offers cloud management and operations services that deliver efficiency, security, and cost reduction — correcting risks and strengthening infrastructure.
Zero Trust strategy implementation
This approach reinforces security by requiring rigorous authentication and continuous access control, preventing attackers from moving freely within the corporate network.
Automated incident response
ACTAR uses automation to act rapidly in the face of attacks, isolating threats and restoring systems quickly to minimize operational impact.
Specialized consulting and dedicated support
Beyond technology, ACTAR offers personalized, strategic guidance — advising your company at every stage of digital protection, from prevention through post-attack recovery.
Partnerships with digital security leaders
ACTAR works with market-recognized solutions, such as those from Check Point, to elevate the level of protection for your company against sophisticated threats.
With these integrated solutions, ACTAR transforms digital security into a competitive advantage — ensuring your company is prepared to face and overcome the challenges posed by today’s cyberattacks.
Protect your company against cyberattacks with ACTAR
Cyberattacks are a real and growing threat to companies of all sizes. With increasingly sophisticated methods — such as ransomware, phishing, and DDoS attacks — it is essential to understand the risks and be prepared to identify signs of intrusion. Knowing the main types of attacks and current threats helps strengthen your business’s digital defenses.
The good news is that, with the right support, your company can effectively protect itself against these dangers. ACTAR offers comprehensive digital security solutions, including continuous monitoring, rapid incident response, and advanced strategies such as Zero Trust and cloud security. Partnering with ACTAR means guaranteeing your business continuity and the protection of your data.
Do not wait to become a victim before acting. Contact ACTAR today and discover how to strengthen your company’s security against cyberattacks. Protect your future with those who know the subject!
