How to identify a phishing attack and protect your business data?

Phishing is no longer just an IT problem; it is a direct threat to business strategy and sustainability. According to the 2024 X-Force report, 41% of security incidents in companies began with phishing, making it the primary entry point for data breaches, financial fraud, and compliance violations.

The scenario continues to escalate: according to Allianz Commercial, in just the first half of 2023, there was a 50% increase in data breaches, with Brazil leading Latin America with 23 billion attempted cyberattacks during the same period.

To support leaders and teams in preventing digital threats, we have gathered in this article a comprehensive analysis of phishing, from its concept and main variations to the most common warning signs, real cases that impacted large companies, and the most effective technical and behavioral strategies to protect your business from an invisible threat. 

What is phishing?

Phishing is a form of cyberattack that uses social engineering to deceive users into revealing confidential information, such as passwords, banking data, and corporate credentials. Attacks are usually carried out through emails, instant messages, or fake websites that mimic legitimate communications from known companies or services.

What are the most frequent types of phishing attacks?

In the business environment, phishing attacks evolve with sophistication and targeting. It is not just about generic emails; cybercriminals tailor their approaches to exploit hierarchies, financial processes, and internal workflows of organizations. The most common types include:

• Spear Phishing: highly targeted, the attacker collects public information (such as LinkedIn or institutional sites) to personalize the message. It often simulates communications between departments or with suppliers, increasing the response rate.
• Whaling: targets high-level executives (such as CFOs, CTOs, CEOs) with refined communications, often associated with sensitive decisions — such as payment approvals or access authorizations. The potential for damage is high, and the language tends to be convincing and formal.
• Business Email Compromise (BEC): involves the actual compromise of a corporate account or the spoofing of trusted domains and senders. Used to instruct bank transfers, alter supplier data, or redirect payment flows.
• Smishing and Vishing: although less common in mass corporate attacks, they are increasingly exploited in remote or hybrid contexts. They act via SMS or phone calls simulating IT, HR, or banks, seeking identity validation or installing malicious apps.
• Clone Phishing: based on intercepting and replicating legitimate emails already exchanged within the company. The intruder discreetly alters links or attachments and resends the content as if it were a continuation of the original conversation.

How to recognize signs of a phishing attack before clicking?

Even with the advancement of digital security solutions, the most exploited link by cybercriminals remains human behavior. In phishing campaigns, the success of the attack depends on a single click, and this click often occurs because the user does not recognize the warning signs in time. In a corporate context, where a single compromised credential can open doors to fraud, data breaches, or compliance violations, identifying phishing attempts becomes an essential skill.

In this section, we have compiled the most frequent indications of phishing attacks and explained how training, processes, and attention to detail can transform employees into active barriers against digital threats. 

Email addresses similar to the real domain: Phishers use domains that are almost identical to the company or supplier

Grammatical or formatting errors: Poorly written messages, with linguistic inconsistencies or misaligned visual elements, are strong indicators of forgery.

Shortened or masked links: URLs that do not correspond to the actual destination. Before clicking, hover over the link and check the full URL.

Urgency or threats: Statements like “immediate action required” or “your account will be blocked” induce impulsive decisions and reduce critical analysis.

Unexpected attachments: Unsolicited files (ZIP, EXE, DOC with macros) are common in malicious campaigns, especially if sent by generic senders or with vague context.

Request for confidential data via email: No legitimate department (IT, finance, HR) should request passwords, tokens, or banking data via email.

What were the biggest phishing cases in recent years and what can we learn from them?

Companies facing corporate phishing attacks can lose between US$ 4.9 million per occurrence, considering response costs, downtime, reputational damage, and legal mitigation. This data highlights not only the frequency of these threats but their destructive potential. Below, we recall some of the most emblematic cases and what each teaches about maturity in digital security.

M&S (2025)

A Scattered Spider group attack severely impacted the digital infrastructure of Marks & Spencer, resulting in an estimated loss of £300 million in operating profit. The attackers’ entry was through third-party channels, a clear warning about the importance of governance over service and support providers. The lesson is that outsourcing without operational shielding and security training can become an exposure vector for companies of any size.

Ubiquiti Networks (2015)

With a BEC attack, the company lost US$47 million in a single compromised transaction. The attack simulated internal communications between executives, instructing fraudulent payments. This case exposes the fragility of financial processes without dual verification, especially in companies with high volumes of international transactions. For executives, this involves reinforcing human validation as an essential layer of security.

Caesars Entertainment (2023)

Based on social engineering and manipulation of help desks, attackers gained access to sensitive credentials and demanded ransom payment. The company, anticipating greater losses, opted to pay around US$15 million. This episode reinforces that a security culture is not optional — and that reliance on third-party support without clear authentication protocols is a critical point for C-level executives.

What is the role of the human factor in phishing attacks?

The human factor is invariably the most exploited link in phishing attacks not due to technical weakness but due to context and behavior. Cybercriminals take advantage of accelerated routines, excessive notifications, trust among colleagues, and the natural tendency to respond quickly to urgent requests. Even in companies with advanced security technology, a single impulsive click can compromise an entire environment.

Sophisticated attacks, such as spear phishing and BEC, specifically target employees with privileged access, leveraging publicly available data to personalize approaches. In distributed corporate environments, where teams operate with high autonomy, the risk increases when there is no solid security culture.

With continuous awareness programs, real simulations, and safe behavior KPIs, it is possible to transform employees into active defense agents. After all, technology protects systems; people protect decisions.

How does the lifecycle of a phishing attack work?

A phishing attack does not happen by chance — it follows a structured cycle that involves planning, execution, and, in many cases, prolonged exploitation. Understanding this cycle is critical to interrupting it before it generates real impact.

Reconnaissance (recon)

The attacker collects information about the company, its employees, and communication structures. They may explore social media, institutional websites, public repositories, and even supplier platforms to map targets and build trustworthy profiles.

Preparing the attack

Based on the information collected, the attacker develops highly personalized emails, messages, or calls. At this stage, they define the channel (email, SMS, voice), the narrative (urgency, collection, technical instruction), and the vectors (false links, attachments, cloned sites).

Delivery

The malicious message is sent to the target(s). Often, it simulates legitimate communications from the company, partners, banks, or widely used SaaS tools (such as digital signing platforms, payments, or cloud services).

Victim interaction

The success of the attack depends on user action: clicking on a link, downloading an attachment, or responding with confidential information. Here, the human factor is decisive.

Compromise

If the victim interacts, the attacker can capture credentials, install malware, or gain access to internal systems. In many cases, phishing is just the entry point for more complex movements (e.g., financial movements, ransomware, espionage).

Exploitation or lateral movement

The obtained access is used to escalate privileges, intercept financial flows, or plan new internal attacks, such as corporate email hijacking (BEC) or social engineering with third parties.

Exfiltration or direct impact

The attacker extracts sensitive data or performs high-impact actions (money transfer, data leaks, system encryption). The company’s response time at this point is critical to mitigate damage.

Cover-up and evasion

Many attacks include mechanisms to hinder detection, such as covering tracks, redirecting emails, and using proxies.

What is the difference between phishing, smishing, and vishing?

All these terms refer to variations of attacks based on social engineering; the difference lies in the channel used and, in some cases, the type of interaction required from the victim:

• Phishing: is the broadest term, generally used for attacks via email. The attacker impersonates a trusted entity (such as banks, suppliers, or SaaS platforms) to induce the user to click on malicious links, download files, or provide sensitive data.
• Smishing (SMS + phishing): attacks conducted via text messages. The content often includes links that redirect to fake pages or encourages the user to respond with personal data. It has become more common with the use of mobile devices and integrated messaging apps.
• Vishing (voice + phishing): attacks carried out by telephone calls, usually with human voices (or, more recently, AI) simulating support technicians, financial institutions, or even colleagues. The goal is to extract data, passwords, or induce immediate actions.

What are the best defenses against phishing?

The best defense against phishing is not just technical; it is organizational. The digital data maturity requires that employees know how to identify threats, that critical decisions undergo robust validations and that the security architecture anticipates human error. Prevention is always more economical than containment.

Multi-Factor Authentication (MFA)

It is the most effective barrier against breaches after credential theft. It drastically reduces the risk of compromise, even in cases of successful phishing.

Ongoing education and realistic simulations

Trained employees represent an active line of defense. Simulation campaigns increase vigilance and help create a distributed security culture.

Validation policies for sensitive transactions

Manual dual verification processes for payments, password changes, and registration changes prevent financial and operational fraud.

Advanced email protection solutions (SEG)

Filter out most attempts before they reach the user. They detect malicious links, spoofing, and structural anomalies in messages.

Incident monitoring and response (EDR/XDR)

Identify suspicious behaviors, track internal movements, and provide rapid responses to minimize damage after an incident.

In a context where systems, processes, and corporate knowledge rely on secure digital infrastructure, protecting data and mitigating social engineering risks is not just necessary; it is vital. As João Paulo Miranda, CEO of Objective, emphasizes: “Objective understands the importance of protecting sensitive information and corporate data against cyber threats. We are committed to implementing and promoting practices that ensure the integrity, confidentiality, and availability of our employees’, clients’, and partners’ data.”

We work closely with our clients in building secure environments, promoting modern practices of protection, education, and governance to mitigate risks and strengthen each link in the digital chain. Security is not an additional resource; it is part of the strategic core of innovation. Contact our specialists and find out how we can help you.