The school holiday period is usually perceived by students as the most pleasant time of the year, when worries, duties and stress decreases. Unfortunately, this does not apply to IT administrators and other responsible staff in charge of corporate infrastructure. This holiday season has again seen an increased intensity of various hacker attacks in the corporate environment. Our company is committed to practical offensive and defensive security and raising awareness of this issue. We also test and monitor computer networks. Part of all tests and consultations are specific recommendations and remedial measures that should be applied to increase the overall level of security of a particular business environment.