DEF CON 26 – Andrea Marcelli – Looking for the perfect signature an automatic YARA rules

Дата: 30.08.2019. Автор: CISOCLUB. Категории: Подкасты и видео по информационной безопасности

Given the high pace at which new malware variants are generated, antivirus programs struggle to keep their signatures up-to-date, and AV scanners suffer from a considerable quantity of false negatives. The generation of effective signatures against new malware variants, while avoiding false positive detections, is a highly desirable but challenging task, typically requiring a substantial portion of human expert’s time. Artificial intelligence techniques can be applied to solve the malware signature generation problem.

The ultimate goal is to develop an algorithm able to automatically create a generalized family signature, eventually reducing threat exposure and increasing the quality of the detection. The proposed technique automatically generates an optimal signature to identify a malware family with very high precision and good recall using heuristics, evolutionary and linear programming algorithms.

In this talk I will present YaYaGen (Yet Another YARA Rule Generator), a tool to automatically generate Android malware signatures. Performances have been evaluated on a massive dataset of millions of applications available in the Koodous project, showing that in a few minutes the algorithm can generate precise ruleset able to catch 0-day malware, better than human generated ones.

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