Online Multimedia Social Networks(OSNs) are popular and efficient medium for millions of users. Unfortunately, in wrong hands, they are also effective medium for spreading social malware and propagation of social botnet. A newly proposed multimedia social network threat, Stegobot masks crucial information in a digital image by using a technique known as steganography. Stegobot works by first infecting a computer and then communicates the stolen information, which could be login passwords, bank account details or credit card numbers. Also it efficiently utilizes the advantage of image steganography to hide the presence of communication within the image sharing behavior of OSNs. Since these social bots exhibit unobservable communication channels, existing botnet detection mechanisms cannot be applied to such botnets. In this paper, we present a novel host based method for detecting and differentiating Stegobot profiles. Also the proposed method shows the ability to detect Stegobot network traffic which is inherently different from legitimate multimedia social network traffic. The best performance of our detection system is demonstrated on different social networks data set with different evaluation metrics. Multiple aspects of multimedia attributes proposed in this study help to explore the hidden communication structure of botnet. Stegobot profiles mimic genuine users and compromise other vulnerable users in social network. By using single view features alone it is very difficult to detect bot profiles as well as Stegobot communications and hence in this work a multi-feature approach is considered. Also, this work attempts to help network security experts and forensic analysts to understand the Stegobot communication and the key profiles inside the malicious network.