Phishing is one of the most common and damaging threats to businesses, exploiting deception to obtain credentials, sensitive data and compromise corporate systems. In this article we will explore what to do after a phishing attack and how to prevent future incidents by integrating LECS solutions.
What to do immediately if someone in the company has clicked a phishing link
Isolate the device from the network and protect critical credentials
When an employee clicks on a suspected phishing link, immediate response is critical to reduce the damage. The first thing to do is to isolate the device from the corporate network to prevent the attacker from propagating his attack. This means disconnecting the device from both the wired and Wi-Fi networks. After isolating the compromised device, it is essential to prevent the user from entering new credentials and to immediately change passwords for critical accounts.
Enabling or strengthening multifactor authentication (MFA) on these accounts can significantly reduce risk.
The problem that companies face at this stage is the fear that a single click could compromise accounts and corporate data, with the difficulty of understanding whether the attack had an immediate effect or not. Cyber Evolution’s proposed solution helps monitor the network traffic generated by the compromised device by observing connections to suspicious IPs and domains. LECS flags any anomalies and helps the IT team distinguish between false alarms and real situations of compromise. This helps reduce the risk of chain compromise and contain the incident in a structured way.
With this immediate response, the enterprise gains more control over the attack surface, limiting the damage to only compromised devices and accounts. LECS helps to respond promptly and protect corporate data more effectively.
Activate IT/Security immediately and open a formal incident
If a user clicks on a phishing link, the IT team or SOC should be alerted immediately and a formal incident should be opened by creating an incident ticket. Management of the incident should not be left to the initiative of the individual employee, who may simply delete the email. A formal approach, following corporate guidelines for incident management, is essential for a timely and targeted response.
At this stage, the weakness concerns the delay with which incidents are reported, the incomplete information, and the difficulty in reconstructing the technical sequence of events. This results in an inability to respond promptly, increasing the risk of damage. The LECS solution solves this problem by providing immediate visibility into network events related to the compromised device. LECS provides a consolidated timeline and detailed view of the assets and connections involved, facilitating the Detect/Respond steps according to the NIST framework. This helps to document the incident with reliable technical evidence and enables rapid and efficient response to be initiated.
By quickly activating the incident response process, the incident exposure time can be reduced, ensuring that the company can deal with the attack in a structured and best-practice compliant manner.
Blocking links, sender and related domains at the enterprise level
To prevent phishing from spreading to other employees, links, senders, and domains used in the attack must be blocked immediately. This action must be performed on all levels of the enterprise, including e-mail gateways, Web filters, and network controls.
The problem at this stage is that phishing campaigns can hit multiple users in a very short time. In addition, enterprise security tools, such as email security systems, proxies, and firewalls, can be fragmented, making it difficult to know if other users have been affected by the same attack. The LECS solution helps identify recurring patterns in requests to suspicious domains and IPs from multiple hosts. LECS can trigger automatic actions via the Raises (Autonomous Response) engine to block phishing or C2 domains based on corporate policies. Alternatively, LECS can suggest targeted blocks on corporate firewalls and proxies to reduce further exposures.
This approach prevents a single attack from escalating into an extended campaign, quickly containing the incident and limiting the number of compromised devices and accounts.
Understanding the attack: technical analysis after a phishing incident
Classify the type of phishing and possible impacts (credentials, data, payments)
Phishing comes in several forms, including generic phishing, spear phishing, whaling, smishing and vishing, each of which has different objectives: credential theft, Business Email Compromise (BEC), ransomware and data exfiltration. Understanding the type of phishing helps determine the potential impact and actions to take.
Many times companies treat all malicious emails the same, without considering targeted campaigns, such as those targeting apex figures or critical business systems. The LECS solution allows the incident to be quickly classified using artificial intelligence engines (Specto, Tiresia, and Raises). LECS can detect lateral movement, data exfiltration and persistent connections, allowing it to distinguish a “limited” phishing attack from an evolving one. This helps prioritize corrective actions and determine whether authorities need to be involved or regulatory channels activated.
Analyze post-click network behavior (endpoint, server, cloud, OT/IoT)
Defense against phishing is not limited to checking email: it is critical to monitor post-click network communications. This means monitoring requests to malicious domains, payload downloads, attempted connections to C2, and lateral movement on the internal network.
The problem is that the logs are distributed across multiple systems (email, EDR, firewall) and it can be difficult to reconstruct an end-to-end view of the incident, risking missing important phases of the attack. The LECS solution provides a single source of truth about phishing-related network events by monitoring mirrored traffic and recording each network event in high-reliability logs. Critical logs can be notarized via DLT/blockchain, increasing the evidentiary value of collected evidence.
Decide on corrective actions and any formal communications
After analyzing the incident, it is critical to make quick decisions. Corrective actions may include resetting compromised credentials, isolating vulnerable systems, restoring from backup, and formally communicating to senior management, customers, or authorities as required by regulations such as NIS2.
Uncertainty at this stage relates to when to elevate the incident to management, DPO or CSIRT level, and how to justify the choice with hard data. The LECS solution offers structured network logs and reliable timelines that support documentation of the incident and provide the evidence needed for internal communications and regulatory notifications.
How to prevent the next phishing attack: people, processes, technology
Continuing education and phishing simulations for employees
Defense against phishing in the enterprise requires a structured ongoing training program. Training campaigns should include real-world examples, simple guidelines for recognizing suspicious emails, and periodic simulations to measure click-through rates on suspicious links.
The problem many companies face is message overload that confuses users and the difficulty of maintaining a high level of awareness. In addition, there is a lack of an effective way to measure improvements. The LECS solution is an essential support in this process. LECS collects data on network events and intercepted threats, fueling training campaigns and making them more relevant and targeted, as well as providing data for reporting to management.
Strengthening authentication and privilege: phishing-resistant MFA and least privilege
A crucial step in preventing phishing is theadoption of robust authentication solutions, such as multifactor authentication (MFA). In addition, the principle of least privilege should be adopted to limit access to corporate systems to only those who really need access.
The difficulty of properly managing privileges and protecting corporate credentials is real. The LECS solution is critical because it monitors network access and detects suspicious activity, such as abnormal access attempts and lateral movement. This allows it to limit the impact even when a phishing attack hits, protecting corporate systems from further damage.
Integrating an NDR such as LECS into the phishing defense strategy
In addition to email security and EDRs, integrating an NDR-IPS such as LECS into the phishing defense strategy is critical. LECS provides extensive visibility into network traffic, detecting communications to command and control (C2) servers, lateral movement, and other anomalies.
The problem here relates to poor visibility into internal traffic and the difficulty of monitoring the effects of phishing after the click. The LECS solution enables monitoring and responding to attacks along the entire attack surface, reducing risks from internal vulnerabilities and improving incident response.
In this scenario, LECS support is not limited to just being “a network sensor”-it is a plug-and-play, zero-config NDR-IPS Black Box that can be installed quickly and without having to design new architectures or manage complex configurations.
Once connected to the network, it protects IT, OT, and IoT devices and brings together three AI engines working in parallel: Specto (real-time automatic detection and management), Tiresia (threat forecast), and Raises (autonomous response), so as to move from observation to mitigation when the impact becomes critical.
From phishing as an emergency to phishing as a managed risk
Phishing should not be treated as an isolated emergency, but as an ongoing risk to be managed in a structured way. By adopting advanced technologies such as LECS, companies can integrate phishing into their cyber risk management model with measurable and auditable processes.
LECS becomes a central component for monitoring, detecting and documenting the effects of phishing on the corporate network. With visibility across the entire network surface, LECS enables more effective response and continuous updating of policies, training, and response plans, reducing the frequency and impact of phishing attacks.
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