frida snippets

y también ejemplos de salida

Tabla de contenido

Nativo

• Load C/C++ module
• One time watchpoint
• Socket activity
• Intercept open
• Execute shell command
• List modules
• Log SQLite query
• Log method arguments
• Intercept entire module
• Dump memory segments
• Memory scan
• Stalker
• Cpp Demangler
• Early hook

Androide

• Binder transactions
• Get system property
• Reveal manually registered native symbols
• Enumerate loaded classes
• Class description
• Turn WiFi off
• Set proxy
• Get IMEI
• Hook io InputStream
• Android make Toast
• Await for specific module to load
• Webview URLS
• Print all runtime strings & stacktrace
• Print shared preferences updates
• String comparison
• Hook JNI by address
• Hook constructor
• Hook Java reflection
• Trace class
• Hooking Unity3d
• Get Android ID
• Change location
• Bypass FLAG_SECURE
• Shared Preferences update
• Hook all method overloads
• Register broadcast receiver
• Increase step count
• list classes implements interface with class loaders
• Gancho de acceso al sistema de archivos $ frida --codeshare FrenchYeti/android-file-system-access-hook -f com.example.app --no-pause
• ¿Cómo eliminar/deshabilitar los ganchos de Java? Asigne null a la propiedad implementation .

iOS

• OS Log
• iOS alert box
• File access
• Observe class
• Find application UUID
• Extract cookies
• Describe class members
• Class hierarchy
• Hook refelaction
• Device properties
• Take screenshot
• Log SSH commands

ventanas

Fragmentos sublimes

 {
    "scope": "source.js",
    "completions": [
	{"trigger": "fridainterceptor", "contents": "Interceptor.attach(n    ptr,n    {n        onEnter:function(args) {nn        },n        onLeave: function(retval) {nn        }n    }n)"},
	{"trigger": "fridaperform", "contents": "function main(){n    console.log('main()');n}nnconsole.log('script loaded');nJava.perform(main);"},
	{"trigger": "fridause", "contents": "var kls = Java.use('kls');"},
	{"trigger": "fridahex", "contents": "hexdump(n    ptr,n    {n         offset: 0,n         length: ptr_sizen     }n);" },
	{"trigger": "fridabacktrace", "contents": "console.log('called from:\n' +n        Thread.backtrace(this.context, Backtracer.ACCURATE)n        .map(DebugSymbol.fromAddress).join('\n') + '\n'n);"},
	{"trigger": "fridamods", "contents": "var mods = Process.enumerateModules().filter(function(mod){n    return mod.name.includes("<name>");n});"},
	{"trigger": "fridaexport", "contents": "Module.findExportByName(null, "<export_name>");"},
	{"trigger": "fridabase", "contents": "Module.findBaseAddress(name);"},
	{"trigger": "fridaoverload", "contents": "kls.method_name.overload().implementation=function(){}"}
    ]
}

fragmentos de vim

Para enumerar abreviaturas :ab

Expandir escribiendo key y <Space>

• Agregar a ~/.vimrc

 ab fridaintercept Interceptor.attach(ptr, {<CR><Tab>onEnter: function(args) {<CR><CR>},<CR>onLeave: function(retval) {<CR><CR>}<CR><BS>})
ab fridabacktrace console.warn(Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join('n'));<ESC>F(3;
ab fridadescribe console.log(Object.getOwnPropertyNames(Java.use('$').__proto__).join('nt'))<Esc>F$

JEB

Generador de ganchos de método Java usando un método abreviado de teclado

1. curl -o ~/$JEB$/scripts/FridaCodeGenerator.py https://raw.githubusercontent.com/iddoeldor/frida-snippets/master/scripts/FridaCodeGenerator.py
2. Coloque el cursor en la firma del método Java
3. Presione Ctrl+Shift+Z
4. El código se copia al portapapeles del sistema (usando xclip )

---

Obtener claves SSL

 var keylog_callback = new NativeCallback ( ( ssl , line ) => {
  send ( Memory . readCString ( line ) ) ;
} , 'void' , [ 'pointer' , 'pointer' ] ) ;

if ( ObjC . available ) {
  var CALLBACK_OFFSET = 0x2A8
  if ( Memory . readDouble ( Module . findExportByName ( 'CoreFoundation' , 'kCFCoreFoundationVersionNumber' ) ) >= 1751.108 ) {
    CALLBACK_OFFSET = 0x2B8
  }
  Interceptor . attach ( Module . findExportByName ( 'libboringssl.dylib' , 'SSL_CTX_set_info_callback' ) , {
    onEnter ( args ) {
      ptr ( args [ 0 ] ) . add ( CALLBACK_OFFSET ) . writePointer ( keylog_callback )
    }
  } )
} else if ( Java . available ) {
  var set_keylog_callback = new NativeFunction ( Module . findExportByName ( 'libssl.so' , 'SSL_CTX_set_keylog_callback' ) , 'void' , [ 'pointer' , 'pointer' ] ) ;
  Interceptor . attach ( Module . findExportByName ( 'libssl.so' , 'SSL_CTX_new' ) , {
    onLeave ( retval ) {
      set_keylog_callback ( retval , keylog_callback )
    }
  } )
}

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Cargar módulo CPP

# include < iostream >
# include < string >

extern " C " {
  void * create_stdstr ( char *data, int size) {
    std::string* s = new std::string ();
    (*s). assign (data, size);		  
    return s;
  }
}

$ ./android-ndk/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android21-clang++ a.cpp -o a -shared -static-libstdc++ && adb push a /data/local/tmp/a

 [ device ] - > 
function readStdString ( str ) {
  if ( ( str . readU8 ( ) & 1 ) === 1 ) { // size LSB (=1) indicates if it's a long string
    return str . add ( 2 * Process . pointerSize ) . readPointer ( ) . readUtf8String ( ) ;    
  }
  return str . add ( 1 ) . readUtf8String ( ) ;  
}
[ device ] - > Module . load ( '/data/local/tmp/a' ) ;
[ device ] - > var fp_create_stdstr = Module . findExportByName ( 'a' , 'create_stdstr' ) ;
[ device ] - > var createStdString = new NativeFunction ( fp_create_stdstr , 'pointer' , [ 'pointer' , 'int' ] ) ;
[ device ] - > var stdstr1 = createStdString ( Memory . allocUtf8String ( "abcd" ) , 3 ) ;
"0x07691234567"
[ device ] - > readStdString ( stdstr1 ) ;
"abc" 

Cargar módulo C

• https://frida.re/docs/javascript-api/#cmodule
• https://frida.re/news/2019/09/18/frida-12-7-released/

$ ./aarch64-linux-android21-clang /tmp/b.c -o /tmp/a -shared ../sysroot/usr/lib/aarch64-linux-android/21/liblog.so && adb push /tmp/a /data/local/tmp/a

 #include <stdio.h>
#include <stdlib.h>
#include <android/log.h>    

#define TAG "TEST1"
#define LOGI (...) __android_log_print(ANDROID_LOG_INFO, TAG, __VA_ARGS__)
#define LOGE (...) __android_log_print(ANDROID_LOG_ERROR, TAG, __VA_ARGS__)

void test ( void ) {
  FILE * fp = popen ( "ls -l /sdcard 2>&1" , "r" );
  if ( fp == NULL )
    LOGE ( "executing cmd failed" );
  char b [ 256 ];
  while ( fgets ( b , sizeof ( b ), fp ) != NULL ) {
    LOGI ( "%s" , b );
  }
  pclose ( fp );
}

$ frida -Uf com.app --no-pause --enable-jit -e " Module.load('/data/local/tmp/a') "
[ ] - > new NativeFunction(Module.findExportByName( ' a ' , ' test ' ), ' void ' , [])()

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Punto de vigilancia único

Intercepte funcPtr y registre quién lee/escribe en x2 eliminando permisos con mprotect .

 Process . setExceptionHandler ( function ( exp ) {
  console . warn ( JSON . stringify ( Object . assign ( exp , { _lr : DebugSymbol . fromAddress ( exp . context . lr ) , _pc : DebugSymbol . fromAddress ( exp . context . pc ) } ) , null , 2 ) ) ;
  Memory . protect ( exp . memory . address , Process . pointerSize , 'rw-' ) ;
  // can also use `new NativeFunction(Module.findExportByName(null, 'mprotect'), 'int', ['pointer', 'uint', 'int'])(parseInt(this.context.x2), 2, 0)`
  return true ; // goto PC 
} ) ;

Interceptor . attach ( funcPtr , {
  onEnter : function ( args ) {
    console . log ( 'onEnter' , JSON . stringify ( {
      x2 : this . context . x2 ,
      mprotect_ret : Memory . protect ( this . context . x2 , 2 , '---' ) ,
      errno : this . errno
    } , null , 2 ) ) ;
  } ,
  onLeave : function ( retval ) {
    console . log ( 'onLeave' ) ;
  }
} ) ;

Ejemplo de salida

 [iOS Device::com.app]-> onEnter {
  "x2": "0x1c145c6e0",
  "mprotect_ret": true,
  "errno": 2
}
{
  "type": "access-violation",
  "address": "0x1853b0198",
  "memory": {
    "operation": "read",
    "address": "0x1c145c6e0"
  },
  "context": {
    "lr": "0x100453358",
    "fp": "0x16fb2e860",
    "x28": "0x0",
    "x27": "0x0",
    "x26": "0x104312600",
    "x25": "0x0",
    "x24": "0x0",
    "x23": "0x0",
    "x22": "0x0",
    "x21": "0xb000000422bbda03",
    "x20": "0x1c4a22560",
    "x19": "0xb000000422bbda03",
    "x18": "0x0",
    "x17": "0x100d25290",
    "x16": "0x1853b0190",
    "x15": "0x0",
    "x14": "0x5",
    "x13": "0xe5a1c4119597",
    "x12": "0x10e80ca30",
    "x11": "0x180000003f",
    "x10": "0x10e80ca00",
    "x9": "0x1020ad7c3",
    "x8": "0x0",
    "x7": "0x0",
    "x6": "0x0",
    "x5": "0x0",
    "x4": "0xb000000422bbda03",
    "x3": "0x1c4a22560",
    "x2": "0x1c145c6e0",
    "x1": "0x1020ad7c3",
    "x0": "0x1c145c6e0",
    "sp": "0x16fb2e790",
    "pc": "0x1853b0198"
  },
  "nativeContext": "0x16fc42b24"
}
onLeave

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Actividad del zócalo

 Process
  . getModuleByName ( { linux : 'libc.so' , darwin : 'libSystem.B.dylib' , windows : 'ws2_32.dll' } [ Process . platform ] )
  . enumerateExports ( ) . filter ( ex => ex . type === 'function' && [ 'connect' , 'recv' , 'send' , 'read' , 'write' ] . some ( prefix => ex . name . indexOf ( prefix ) === 0 ) )
  . forEach ( ex => {
    Interceptor . attach ( ex . address , {
      onEnter : function ( args ) {
        var fd = args [ 0 ] . toInt32 ( ) ;
        var socktype = Socket . type ( fd ) ;
        if ( socktype !== 'tcp' && socktype !== 'tcp6' )
          return ;
        var address = Socket . peerAddress ( fd ) ;
        if ( address === null )
          return ;
        console . log ( fd , ex . name , address . ip + ':' + address . port ) ;
      }
    } )
  } )

Ejemplo de salida

Ejemplo de Android

 # wrap the script above inside Java.perform
$ frida -Uf com.example.app -l script.js --no-pause
[Android Model-X::com.example.app]- > 117 write 5.0.2.1:5242
117 read 5.0.2.1:5242
135 write 5.0.2.1:4244
135 read 5.0.2.1:4244
135 read 5.0.2.1:4244

⬆ Volver arriba

Intercepción abierta

Un ejemplo para interceptar libc#open y registrar el seguimiento si se abrió un archivo específico.

 Interceptor . attach ( Module . findExportByName ( "/system/lib/libc.so" , "open" ) , {
  onEnter : function ( args ) {
    this . flag = false ;
    var filename = Memory . readCString ( ptr ( args [ 0 ] ) ) ;
    console . log ( 'filename =' , filename )
    if ( filename . endsWith ( ".xml" ) ) {
      this . flag = true ;
      var backtrace = Thread . backtrace ( this . context , Backtracer . ACCURATE ) . map ( DebugSymbol . fromAddress ) . join ( "nt" ) ;
      console . log ( "file name [ " + Memory . readCString ( ptr ( args [ 0 ] ) ) + " ]nBacktrace:" + backtrace ) ;
    }
  } ,
  onLeave : function ( retval ) {
    if ( this . flag ) // passed from onEnter
      console . warn ( "nretval: " + retval ) ;
  }
} ) ; 

 var fds = { } ; // for f in /proc/`pidof $APP`/fd/*; do echo $f': 'readlink $f; done
Interceptor . attach ( Module . findExportByName ( null , 'open' ) , {
  onEnter : function ( args ) {
    var fname = args [ 0 ] . readCString ( ) ;
    if ( fname . endsWith ( '.jar' ) ) {
      this . flag = true ;
      this . fname = fname ;
    }
  } ,
  onLeave : function ( retval ) {
    if ( this . flag ) {
      fds [ retval ] = this . fname ;
    }
  }
} ) ;
[ 'read' , 'pread' , 'readv' ] . forEach ( fnc => {
  Interceptor . attach ( Module . findExportByName ( null , fnc ) , {
    onEnter : function ( args ) {
      var fd = args [ 0 ] ;
      if ( fd in fds )
        console . log ( ` ${ fnc } : ${ fds [ fd ] }
	t ${ Thread . backtrace ( this . context , Backtracer . ACCURATE ) . map ( DebugSymbol . fromAddress ) . join ( 'nt' ) } ` ) ;
    }
  } ) ;
} ) ;

Ejemplo de salida

Detectando `com.android.chrome`

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Ejecutar comando de shell

 import frida
from frida_tools . 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 ):
        # print("⚡ output: pid={}, fd={}, data={}".format(pid, fd, repr(data)))
        # fd=0 (input) fd=1(stdout) fd=2(stderr)
        if fd != 2 :
            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 )

Ejemplo de uso

Listar el contenido del directorio:

 def ls ( folder ):
    cmd = Shell ([ '/bin/sh' , '-c' , 'ls -la ' + folder ], None )
    cmd . exec ()
    for chunk in cmd . output :
        print ( chunk . strip (). decode ())

Extraer binario desde iOS

 cmd = Shell ([ '/bin/sh' , '-c' , 'cat /System/Library/PrivateFrameworks/Example.framework/example' ], None )
cmd . exec ()
with open ( '/tmp/example' , 'wb+' ) as f :
    f . writelines ( cmd . output )
 # $ file /tmp/example
 # /tmp/example: Mach-O 64-bit 64-bit architecture=12 executable

⬆ Volver arriba

Listar módulos

 Process . enumerateModulesSync ( )
    . filter ( function ( m ) { return m [ 'path' ] . toLowerCase ( ) . indexOf ( 'app' ) != - 1 ; } )
    . forEach ( function ( m ) {
        console . log ( JSON . stringify ( m , null , '  ' ) ) ;
        // to list exports use Module.enumerateExportsSync(m.name)
    } ) ;

Listar módulos y exportaciones

 sudo frida Process -- no - pause -- eval ' var x = { } ; Process . enumerateModulesSync ( ) . forEach ( function ( m ) { x [ m . name ] = Module . enumerateExportsSync ( m . name ) } ) ; x ' - q | less + F

Ejemplo de salida

 {
  "name" : "app_process64" ,
  "base" : "0x6313a1c000" ,
  "size" : 40960 ,
  "path" : "/system/bin/app_process64"
}
{
  "name" : "libappfuse.so" ,
  "base" : "0x749ab96000" ,
  "size" : 53248 ,
  "path" : "/system/lib64/libappfuse.so"
}
{
  "name" : "[email protected]" ,
  "base" : "0x749b448000" ,
  "size" : 90112 ,
  "path" : "/system/lib64/[email protected]"
}
{
  "name" : "[email protected]" ,
  "base" : "0x749ac9e000" ,
  "size" : 94208 ,
  "path" : "/system/lib64/[email protected]"
}
{
  "name" : "[email protected]" ,
  "base" : "0x74981e0000" ,
  "size" : 98304 ,
  "path" : "/system/lib64/[email protected]"
}
{
  "name" : "[email protected]" ,
  "base" : "0x73fb4cc000" ,
  "size" : 40960 
        
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