8.4 KiB
8.4 KiB
Contents
- Enumerate loaded classes
- Extract modules from APK
- Get methods from .so file
- SQLite hook example
- Hook Java refelaction
- Hook constructor
- Hook JNI by address
- Print all runtime strings & Stacktrace
- Find iOS application UUID
- Execute shell command
- TODO list
Enumerate loaded classes
$ frida -U com.pkg -qe 'Java.perform(function(){Java.enumerateLoadedClasses({"onMatch":function(c){console.log(c);}});});' -o pkg.classes
Extract modules from APK
$ frida -Uq com.android. -e "Process.enumerateModules({onMatch: function(m){console.log('-' + m.name)},onComplete:function(){}})"
....
-libsqlite.so
Get methods from so file
$ adb pull /system/lib/libsqlite.so
/system/lib/libsqlite.so: 1 file pulled. 19.7 MB/s (975019 bytes in 0.047s)
$ nm -D libsqlite.so | cut -d' ' -f3 | grep sqlite3
sqlite3_aggregate_context
sqlite3_aggregate_count
....
$ frida-trace -U -i "sqlite*" com.android.
...
24878 ms sqlite3_changes()
24878 ms sqlite3_reset()
24878 ms | sqlite3_free()
24878 ms | sqlite3_free()
24878 ms sqlite3_clear_bindings()
24878 ms sqlite3_prepare16_v2() <<< this is the one that holds the SQL queries
24878 ms | sqlite3_free()
SQLite hook
Interceptor.attach(Module.findExportByName('libsqlite.so', 'sqlite3_prepare16_v2'), {
onEnter: function(args) {
console.log('DB: ' + Memory.readUtf16String(args[0]) + '\tSQL: ' + Memory.readUtf16String(args[1]));
}
});
Hook refelaction:
java.lang.reflect.Method#invoke(Object obj, Object... args, boolean bool)
Java.use('java.lang.reflect.Method').invoke.overload('java.lang.Object', '[Ljava.lang.Object;', 'boolean').implementation = function(a,b,c) {
console.log('hooked!', a, b, c);
return this.invoke(a,b,c);
};
Hook constructor
Java.use('java.lang.StringBuilder').$init.overload('java.lang.String').implementation = function(stringArgument) {
console.log("c'tor");
return this(stringArgument);
};
Hook JNI by address
Hook native method by module name and method address and print arguments
var moduleName = "libfoo.so";
var nativeFuncAddr = 0x1234; // $ nm --demangle --dynamic libfoo.so | grep "Class::method("
Interceptor.attach(Module.findExportByName(null, "dlopen"), {
onEnter: function(args) {
this.lib = Memory.readUtf8String(args[0]);
console.log("dlopen called with: " + this.lib);
},
onLeave: function(retval) {
if (this.lib.endsWith(moduleName)) {
console.log("ret: " + retval);
var baseAddr = Module.findBaseAddress(moduleName);
Interceptor.attach(baseAddr.add(nativeFuncAddr), {
onEnter: function(args) {
console.log("[-] hook invoked");
console.log(JSON.stringify({
a1: args[1].toInt32(),
a2: Memory.readUtf8String(Memory.readPointer(args[2])),
a3: Boolean(args[3])
}, null, '\t'));
}
});
}
}
});
Print runtime strings
Print created StringBuilder & StringBuffer & Stacktrace
Java.perform(function() {
['java.lang.StringBuilder', 'java.lang.StringBuffer'].forEach(function(clazz, i) {
console.log('[?] ' + i + ' = ' + clazz);
var func = 'toString';
Java.use(clazz)[func].implementation = function() {
var ret = this[func]();
send('[' + i + '] ' + ret);
// raising an exception to get stacktrace
Java.perform(function() {
send('[*] ' + Java.use('java.lang.Exception').$new().getStackTrace().toString().split(',')[1]);
});
}
return ret;
};
});
Find iOS application UUID
Get UUID for specific path when attached to an app
var PLACEHOLDER = '{UUID}';
function extractUUIDfromPath(path) {
var bundleIdentifier = String(ObjC.classes.NSBundle.mainBundle().objectForInfoDictionaryKey_('CFBundleIdentifier'));
var path_prefix = path.substr(0, path.indexOf(PLACEHOLDER));
var plist_metadata = '/.com.apple.mobile_container_manager.metadata.plist';
var folders = ObjC.classes.NSFileManager.defaultManager().contentsOfDirectoryAtPath_error_(path_prefix, NULL);
for (var i = 0, l = folders.count(); i < l; i++) {
var uuid = folders.objectAtIndex_(i);
var metadata = path_prefix + uuid + plist_metadata;
var dict = ObjC.classes.NSMutableDictionary.alloc().initWithContentsOfFile_(metadata);
var enumerator = dict.keyEnumerator();
var key;
while ((key = enumerator.nextObject()) !== null) {
if (key == 'MCMMetadataIdentifier') {
var appId = String(dict.objectForKey_(key));
if (appId.indexOf(bundleIdentifier) != -1) {
return path.replace(PLACEHOLDER, uuid);
}
}
}
}
}
console.log( extractUUIDfromPath('/var/mobile/Containers/Data/Application/' + PLACEHOLDER + '/Documents') );
Execute shell command
"""
Execute shell command
For example, list directory contents:
def ls(folder):
cmd = Shell(['/bin/sh', '-c', 'ls -la ' + folder], None)
cmd.exec()
for chunk in cmd.output:
print(chunk.strip().decode())
"""
import frida
from frida.application import Reactor
import threading
import click
class Shell(object):
def __init__(self, argv, env):
self._stop_requested = threading.Event()
self._reactor = Reactor(run_until_return=lambda reactor: self._stop_requested.wait())
self._device = frida.get_usb_device()
self._sessions = set()
self._device.on("child-added", lambda child: self._reactor.schedule(lambda: self._on_child_added(child)))
self._device.on("child-removed", lambda child: self._reactor.schedule(lambda: self._on_child_removed(child)))
self._device.on("output", lambda pid, fd, data: self._reactor.schedule(lambda: self._on_output(pid, fd, data)))
self.argv = argv
self.env = env
self.output = [] # stdout will pushed into array
def exec(self):
self._reactor.schedule(lambda: self._start())
self._reactor.run()
def _start(self):
click.secho("✔ spawn(argv={})".format(self.argv), fg='green', dim=True)
pid = self._device.spawn(self.argv, env=self.env, stdio='pipe')
self._instrument(pid)
def _stop_if_idle(self):
if len(self._sessions) == 0:
self._stop_requested.set()
def _instrument(self, pid):
click.secho("✔ attach(pid={})".format(pid), fg='green', dim=True)
session = self._device.attach(pid)
session.on("detached", lambda reason: self._reactor.schedule(lambda: self._on_detached(pid, session, reason)))
click.secho("✔ enable_child_gating()", fg='green', dim=True)
session.enable_child_gating()
# print("✔ resume(pid={})".format(pid))
self._device.resume(pid)
self._sessions.add(session)
def _on_child_added(self, child):
click.secho("⚡ child_added: {}".format(child), fg='green', dim=True)
self._instrument(child.pid)
@staticmethod
def _on_child_removed(child):
click.secho("⚡ child_removed: {}".format(child), fg='green', dim=True)
def _on_output(self, pid, fd, data):
# if len(data) > 0:
# print("⚡ output: pid={}, fd={}, data={}".format(pid, fd, repr(data)))
self.output.append(data)
def _on_detached(self, pid, session, reason):
click.secho("⚡ detached: pid={}, reason='{}'".format(pid, reason), fg='green', dim=True)
self._sessions.remove(session)
self._reactor.schedule(self._stop_if_idle, delay=0.5)
@staticmethod
def _on_message(pid, message):
click.secho("⚡ message: pid={}, payload={}".format(pid, message), fg='green', dim=True)
TODOs
-
Add GIFs & docs
-
References overview: