No abstract

DNS tunneling is a method used by malicious users who intend to bypass the firewall to send or receive commands and data. This has a significant impact on revealing or releasing classified information. Several researchers have examined the use of machine learning in terms of detecting DNS tunneling. However, these studies have treated the problem of DNS tunneling as a binary classification where the class label is either legitimate or tunnel. In fact, there are different types of DNS tunneling such as FTP-DNS tunneling, HTTP-DNS tunneling, HTTPS-DNS tunneling, and POP3-DNS tunneling. Therefore, there is a vital demand to not only detect the DNS tunneling but rather classify such tunnel. This study aims to propose a multilabel support vector machine in order to detect and classify the DNS tunneling. The proposed method has been evaluated using a benchmark dataset that contains numerous DNS queries and is compared with a multilabel Bayesian classifier based on the number of corrected classified DNS tunneling instances. Experimental results demonstrate the efficacy of the proposed SVM classification method by obtaining an -measure of 0.80.

Background An uncommon cause of appendicitis is the entrapment of ingested foreign objects in the appendix. Although a rare event, it could remain asymptomatic for a prolonged time. The presence of foreign bodies in the gastrointestinal tract has a high potential for complications, in particular if sharp or large enough in size to cause obstruction. However, most often an ingested foreign object would be eliminated in the stool. Rarely, it may reside in the appendix depending on various factors such as the nature of the ingested body and the appendiceal peristaltic movements. Case presentation We report a case of abdominal pain due to a diamond earring trapped in the appendix for 2 years. A plain X-ray of the abdomen confirmed the diagnosis which prompted a laparoscopic appendectomy resulting in resolution of symptoms. Conclusion The initial presentation of an ingested foreign object can be similar to signs of symptoms of acute appendicitis and the patient must be monitored for several days to follow the trajectory of the foreign body in order to prevent complications. Even though the incidence is more common among the pediatric population, vigilance among adults should also be undertaken with a history of ingesting a foreign object, as this case demonstrates the importance of keeping a high index of suspicion when encountering such cases.