Android Application Sandbox. Thomas Bläsing DAI-Labor TU Berlin
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1 Android Application Sandbox Thomas Bläsing DAI-Labor TU Berlin
2 Agenda Introduction What is Android? Malware on smartphones Common countermeasures on the Android platform Use-Cases Design Conclusion Summary Future work / Bibliography 2
3 What is Android? mobile OS based on a Linux 2.6 kernel initially developed by Google, later by the Open Handset Alliance (OHA) open source (Apache license) since oct 2008 some drivers for special mobile hardware are still not free official supported platform is ARM but there is a port for x86 platforms Dalvik VM register-based VM for Java still growing (online-)community 3
4 What is Android? (technical view) source: 4
5 Malware on smartphones interesting topic paper Android: Next Target? Schmidt et al smartphones getting more and more popular 2 main categories of attacks: direct attacks, e.g. bypassing permissions system indirect attacks, e.g. information leakage users doesn t realize that most smartphones are like normal desktop PCs 5
6 Common counteractive measures on Android each application process is separated in an own sandbox-like environment strict permissions system you have to explicitly grant permissions before installing the application all applications have to be signed but signatures do not need to be certified by a trustworthy organization there are some Anti-Virus applications on the market but just signature based detection 6
7 Problems on Android Security ability of using the Java Native Interface (JNI) to speed-up applications bypass SDK restrictions and normal application lifecyle Google provides NDK (Native Development Kit) rising amount of Applications for rooted Android phones this applications could have COMPLETE control over the mobile device (root access) ability to access internal Android packages via reflection access on not officially supported API content Security on Android is an issue! 7
8 Use-Cases Design Conclusion 8
9 Use-Cases for AAS (i) Application Provider (e.g. Android Market) detect malware to prevent submission to the market improve techniques for Anti-Virus Software (ii) User wants to know what the Application is exactly doing on the phone e.g. access personal data although App didn t have the permission 9
10 Design of the AAS 10
11 Design of the AAS APK 10
12 Design of the AAS AndroidManifest.xml APK 10
13 Design of the AAS AndroidManifest.xml classes.dex APK 10
14 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures libraries (.so) layout.xml... APK 10
15 Design of the AAS AndroidManifest.xml classes.dex classes.dex Ressources pictures libraries (.so) layout.xml... APK 10
16 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures layout.xml libraries (.so)... APK static analysis 10
17 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures layout.xml libraries (.so)... APK static analysis V ( {1,0} ) 1 10
18 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures layout.xml libraries (.so)... Android Emulator APK static analysis V ( {1,0} ) 1 10
19 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures - install - exec - random input layout.xml libraries (.so)... Android Emulator APK static analysis V ( {1,0} ) 1 10
20 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures - install - exec - random input layout.xml libraries (.so)... Android Emulator APK static analysis V ( {1,0} ) 1 10
21 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures - install - exec - random input V ( {1,0} ) 2 layout.xml libraries (.so)... Android Emulator APK static analysis V ( {1,0} ) 1 10
22 Design of the AAS AndroidManifest.xml classes.dex Ressources pictures - install - exec - random input V ( {1,0} ) 2 layout.xml libraries (.so)... Android Emulator?! APK static analysis V ( {1,0} ) 1 10
23 Design of the AAS (2) first step done via disassemble and grep disassemble of.dex file with baksmali ( second step, LKM which hijacks some syscalls LKM acts like a rootkit logging of syscall usage into logfile which will be analysed after execution time 11
24 Conclusion / Thesis 2 step analysis Does the result of the static analysis imply the result of the dynamic analysis? first step really fast second step very expensive consider the 2 Use-Cases! (User/AppMarket) Do you always need the 2 steps or just one of them, and if so: which one? to prove thesis I need a lot of applications Problem: Google AppMarket closed source, no direct access, only via mobile phone I wrote a robot which has downloaded ~150 APKs for researching :) 12
25 Summary Future work / Bibliography 13
26 Future Work better reverse engineering of mobile applications real-time malware detection on smartphones anomaly detection possible with AAS, but actually not in real-time! Android Honeypot Honeynet 14
27 Bibliography MOBILE APPLICATION SECURITY ON ANDROID: Context on Android security (Burns, Black Hat 2009) Smartphone Malware Evolution Revisited: Android Next Target? (Aubrey-Derrick Schmidt et al., 4th International Conference on Malicious and Unwanted Software (Malware 2009), Montreal, Quebec, Canada - to appear) Developing and benchmarking native linux applications on android. (Leonid Batyuk et al., In mobile Wirelessmiddleware, Operating Systems, and Applications, 2009) 15
28 End thanks for your attention 16
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