Smartphone Botnets. Berlin Institute of Technology FG Security in Telecommunications SPRING 2010
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1 Berlin Institute of Technology FG Security in Telecommunications Smartphone Botnets SPRING 2010 Weiss Collin Mulliner, July 7 th 2010 collin@sec.t-labs.tu-berlin.de
2 Agenda Introduction Motivation Project Goals Command and Control Payloads Conclusions
3 Introduction Botnets are a serious security problem in todays Internet Spam, fraud, identity theft, malware hosting, DDoS,... Anti botnet research is a big area of research Smartphone botnets Vulnerabilities exist in all major smartphone platforms Smartphones are powerful enough to host a bot Smartphone-based botnets would offer additional financial gains for a botmaster Therefore, smartphone botnets are likely to appear and thus need to be studied
4 The iphone ikee.b botnet Very simple botnet that is based on the ikee.a worm Abused the default root password of jailbroken iphones Infected phones via ssh/scp No user interaction required! (first one!) Very simple HTTP-based C&C download a shell script with new commands Main payload was to steel SMS database November 2009 References Analysis of ikee.b [ ikee.a [
5 Motivation Understand mobile botnets How will they work How to build one Identify general weak spots Operators need to prepare for mobile botnets Keep mobile network operational Filter fraud (nobody likes upset customers) Need to be able to detect and remove bots
6 Goals Implement smartphone bot and botnet C&C Try different C&C schemas Implement payloads Evaluate botnet In test network (in test GSM network) On real network (manual install, not spreading!) Investigate detection possibilities Network side (mobile phone network)
7 Command and Control (C&C) C&C is the most important part of a botnet Control channel for botmaster If channel can be blocked the botnet is dead Needs to be robust against attacks by defenders (good guys) and other botmasters Challenges for mobile C&C Connectivity: Wifi vs. GSM/3G changes in bandwidth Communication costs (GSM: SMS/data) Computational power Battery power
8 Internet-based (IP-based) C&C C&C via IP/Internet Follow PC-based botnets using P2P
9 GSM-based (SMS-based) C&C C&C via SMS/MMS Botmaster uses a phone to control the botnet Phone maybe hijacked
10 Local Wireless C&C WiFi (AdHoc), Bluetooth Botmaster injects command and lets it travel through the net
11 C&C Communication Costs Mobile phone service cost money SMS, packet-data, circuit switch data (CSD) calls,... Costs could make a botnet detectable more easily, faster Need to analyze cost factor When designing a C&C system for a mobile botnet When building a detection system Interesting because of... Service plans Countries, roaming
12 Mobile Botnet Payloads Mobile phones have abilities not found on desktop computers Modem Billing system Non-IP communication Data not found on desktop computer Special hardware such as a GPS Possibilities Unique kind of denial-of-service attacks Unique kind of fraud Data / identify theft
13 Data Theft Smartphone store many kinds of private information Addressbook Calendar s + account credentials SMS/MMS Voicecall records Photos Gain for botmaster Extortion (private) Identity theft (private) Industrial espionage (commercial)
14 (D)Denial-of-Service Payloads Operator / Network DoS a single cell or cell area DoS MNO backend infrastructure [1] Real World DoS emergency number DoS company hotline (extortion) SMS flooding [1] Trynor et al.: On cellular botnets: measuring the impact of malicious devices on a cellular network core, 16 th ACM CCS
![hotline (extortion) SMS flooding [1] Trynor et al.](/docs-images/45/2608352/images/page_14.jpg ": On cellular botnets: measuring the impact of malicious devices on a cellular")
15 Conclusions Bots on mobile phones pose some challenges Many possibilities for C&C A lot of work for the defenders Mobile bots offer unique possibilities to a botmaster Phone call / sms related fraud (easy) New interesting DoS attacks Smartphone botnets are interesting and a hot topic right now
16 Berlin Institute of Technology FG Security in Telecommunications Questions? Thank you!
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