90 lines
3.0 KiB
Markdown
90 lines
3.0 KiB
Markdown
### learn-frida-the-hard-way
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TODOs:
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- Add GIFs & docs
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- Enumerate loaded classes
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$ frida -U com.pkg -qe 'Java.perform(function(){Java.enumerateLoadedClasses({"onMatch":function(c){console.log(c);}});});' -o pkg.classes
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- Extract modules from APK
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$ frida -Uq com.android. -e "Process.enumerateModules({onMatch: function(m){console.log('-' + m.name)},onComplete:function(){}})"
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....
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-libsqlite.so
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- get methods from .so file
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$ adb pull /system/lib/libsqlite.so
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/system/lib/libsqlite.so: 1 file pulled. 19.7 MB/s (975019 bytes in 0.047s)
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$ nm -D libsqlite.so | cut -d' ' -f3 | grep sqlite3
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sqlite3_aggregate_context
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sqlite3_aggregate_count
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....
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$ frida-trace -U -i "sqlite*" com.android.
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...
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24878 ms sqlite3_changes()
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24878 ms sqlite3_reset()
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24878 ms | sqlite3_free()
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24878 ms | sqlite3_free()
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24878 ms sqlite3_clear_bindings()
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24878 ms sqlite3_prepare16_v2() <<< this is the one that holds the SQL queries
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24878 ms | sqlite3_free()
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- SQLite hook example (+Native)
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Interceptor.attach(Module.findExportByName('libsqlite.so', 'sqlite3_prepare16_v2'), {
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onEnter: function(args) {
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console.log('DB: ' + Memory.readUtf16String(args[0]) + '\tSQL: ' + Memory.readUtf16String(args[1]));
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}
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});
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* Hook example: `java.lang.reflect.Method#invoke(Object obj, Object... args, boolean bool)`
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Java.use('java.lang.reflect.Method').invoke.overload('java.lang.Object', '[Ljava.lang.Object;', 'boolean').implementation = function(a,b,c) {
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console.log('hooked!', a, b, c);
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return this.invoke(a,b,c);
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};
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* Hook constructor
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Java.use('java.lang.StringBuilder').$init.overload('java.lang.String').implementation = function(stringArgument) {
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console.log("c'tor");
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return this(stringArgument);
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};
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* Hook Native (JNI)
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```
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Interceptor.attach(Module.findExportByName(null, "dlopen"), {
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onEnter: function(args) {
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var lib = Memory.readUtf8String(args[0]);
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console.log("dlopen called with: " + lib);
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this.lib = lib; // pass argument to onLeave
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},
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onLeave: function(retval) {
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console.log("dlopen called exit with: " + this.lib);
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if (this.lib.endsWith("libfoo.so")) {
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console.log("ret: " + retval);
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var funcAddr = 0x0021e5b4; // find function address with $ nm --demangle --dynamic libfoo.so | grep "SomeClass::someFunction"
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var offset = Module.findBaseAddress("libfoo.so"); // Process.findModuleByName("libfoo.so").base) will also work
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Interceptor.attach(offset.add(funcAddr), {
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onEnter: function(args) {
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console.log('hooked !');
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}
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});
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}
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}
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});
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```
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References overview:
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https://techblog.mediaservice.net/2017/09/tracing-arbitrary-methods-and-function-calls-on-android-and-ios/
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