تحلیل پویا

Detection of browser attacks is considered a serious challenge in today’s web applications. Man in the Browser (MitB) attack is an important type of these attacks that can lead to changes in web page contents, interference in network traffic, session hijacking, and user information theft by using Trojans. In this paper, an efficient tool for real-time detection of MitB attacks through dynamic analysis of web pages based on the description of attack patterns is presented. The advantage of the proposed tool is that it is not limited to identifying one or more specific attacks and the identification method code is not embedded in the tool, but the patterns of different attacks are specified separately. In order to evaluate the presented tool, two vulnerable web services provided by OWASP, which have a wide range of known vulnerabilities, were used along with the BeEF penetration test framework, and a set of MitB attacks were practically implemented and evaluated by the tool. The same tests were performed using three other similar tools and compared with the developed tool. In addition to the superiority of the presented tool in terms of the independence of attack descriptions from the tool itself, the results show that the accuracy and readability of its diagnosis are better than similar tools.

Malware writers leverage several techniques for thwarting the detection method of antimalware software. An effective technique is applying obfuscation techniques to make metamorphic malware. Metamorphism modifies the code structure in a way that while retaining the behavior, the pattern and structure of the code is changed. Recently, researchers have proposed a new method for metamorphic malware detection that works based on static analysis of malware code. However, some obfuscation techniques exist that when applied, the efficacy of static analyzes is adversely affected. To overcome this issue, in this paper, we apply a dynamic analysis in addition to static analysis. The new method elicits some information from both static and dynamic analyzes, combines them, and uses the resultant information to learn a classifier. The obtained classifier is then used to detect a new instance of an existing family of metamorphic malwares. In fact, the combination of both static and dynamic information is intended to address the weaknesses of each individual analysis and leads to an overall better effectiveness. In order to evaluate the proposed method, experiments on 450 files including benign files and 5 families of metamorphic malwares, namely MPCGEN, G2, VLC, NGVCK, and MWOR, have been conducted. The experiments were performed in three cases: static analysis, dynamic analysis, and the combination of both. The results of comparison among three cases show that metamorphic malware detection is not reached to 100 percent precision via either static or dynamic analysis individually. However, using the combination of both static and dynamic information could have consistently led to detection with 100 percent precision, which have been measured using ROC metric.