RootBeer

Transcript

1. Root Beer Shibuya.apk #21 @magie_pooh

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4. Root Beer • A tasty root checker library and sample

   app. • Java Check • Native Check

5. Java Check • CheckRootManagementApps • CheckPotentiallyDangerousAppss • CheckRootCloakingApps • CheckTestKeys

   • checkForDangerousProps • checkForBusyBoxBinary • checkForSuBinary • checkSuExists • checkForRWSystem • checkForSuBinary

6. detectRootManagementApps • Using the PackageManager, check for a list of

   well known root apps • "com.noshufou.android.su" • "com.noshufou.android.su.elite" • "eu.chainfire.supersu" • "com.koushikdutta.superuser" • "com.thirdparty.superuser" • "com.yellowes.su"

7. detectPotentiallyDangerousApps • Using the PackageManager, check for a list of

   well known apps that require root • "com.koushikdutta.rommanager" • "com.koushikdutta.rommanager.license" • "com.dimonvideo.luckypatcher" • "com.chelpus.lackypatch" • "com.ramdroid.appquarantine" • "com.ramdroid.appquarantinepro"

8. detectRootCloakingApps • Using the PackageManager, check for a list of

   well known root cloak apps (not used in isRooted function) • “com.devadvance.rootcloak" • "com.devadvance.rootcloakplus" • "de.robv.android.xposed.installer" • "com.saurik.substrate" • "com.zachspong.temprootremovejb" • "com.amphoras.hidemyroot" • "com.amphoras.hidemyrootadfree" • "com.formyhm.hiderootPremium" • "com.formyhm.hideroot"

9. checkForBinary("su") • emulator => RootBeer: checkForBinary() [179] - /system/xbin/su binary

   detected!

10. checkForBinary("busybox") • busybox • BusyBox combines tiny versions of many

    common UNIX utilities into a single small executable • https://busybox.net/about.html • RootԽͨ͠ޙʹೖΕͨΓ͢ΔΒ͍͠ • ೖͬͨ··ͷ୺຤΋͋ΔΒ͍͠ • RootBeer#isRootedWithoutBusyBoxCheck

11. checkForDangerousProps() • Checks for several system properties • Runtime.getRuntime().exec("getprop").getInputS tream()

    • Լه͕̎ͭ͋Ε͹Rooted൑ఆ • ro.debuggable: 1 • ro.secure: 0

12. checkForRWPaths() • When you're root you can change the permissions

    on common system directories, this method checks if any of these path Const.pathsThatShouldNotBeWrtiable are writable. • "/system" • "/system/bin" • "/system/sbin" • "/system/xbin" • "/vendor/bin" • "/sbin" • "/etc"

13. detectTestKeys() • Release-Keys and Test-Keys has to do with how

    the kernel is signed when it is compiled. Test-Keys means it was signed with a custom key generated by a third-party developer. • /system/build.prop಺ͷro.build.tags

14. checkSuExists() • `which su`

15. checkForRootNative() • Native checks are often harder to cloak/trick so

    here we call through to our native root checker • JNI??

16. Disclaimer Remember root==god, so there's no 100% way to check

    for root.
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18. Thanks!