System and method for detecting a cyberattack

A method for detecting a cyberattack in a network infrastructure, the method being executable by a computing device including a processor communicatively couplable to the network infrastructure, the network infrastructure having an infrastructure external perimeter, the computing device being disposed externally with respect to the infrastructure external perimeter, the method comprising:

• obtaining, by the processor, data representative of a given protected infrastructure element;
• accessing, by the processor, a network graph representative of a network including the network infrastructure to identify in the network graph, based on the given protected infrastructure element, an infrastructure graph representative of the network infrastructure,
• a given vertex of the infrastructure graph being representative of a respective one of linked infrastructure elements associated to the given protected infrastructure element in the network infrastructure;
• and
• a given edge connecting two adjacent vertices being representative of a respective common parameter between respective infrastructure elements associated with the adjacent nodes;
• analyzing, by the processor, a given one of the linked infrastructure elements associated to the given protected infrastructure element to determine a respective value thereof;
• determining, by the processor, whether the respective value of the given one of the linked infrastructure elements is indicative of the network infrastructure being compromised;
• in response to the respective value of any one of the linked infrastructure elements associated to the given protected infrastructure element being indicative of the network infrastructure being compromised:
• generating, by the processor, at least one warning about a potential cyberattack, and
• transmitting, by the processor, the at least one warning cyberattack to an operator of the network infrastructure.