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r2frida-cheatsheet.md

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Install

r2pm -i f2frida

Starting a session

Attach to existing process in the host

r2 frida://Twitter  
r2 frida://<pid>

Attach to existing process on a device

r2 frida://<deviceID>/Twitter  
r2 frida://<deviceID>/<pid>

Spawn a process on the host

r2 frida:///usr/bin/ls
r2 "frida:///usr/bin/ls -al"

Spawn a process on a device

r2 frida://<device_name>//your.package.name

When spawning a process it's started in suspended mode. It must be resumed using the \dc command

Configs

Is recomended to activate ESIL emulation anotations using e asm.emu=true

Commands

All r2frida commands are precedded with a \

HELP

\?      Show help

REMOTE DEVICE ARCH

.\i*    To tell radare2 the arch of the process (useful for remote devices)

SEARCH

\/[x][j] <string|hexpairs>  Search hex/string pattern in memory ranges (see `search.in=?`)

INSPECT

Don't use aaa, is too time consuming and complex for large apps!!!
Use frida inspect capabilities instead

\i                               Show target information    
\ii[*]                           List imports    
\il                              List libraries    
\is[*] <lib>                     List symbols of lib (local and global ones)    
  \i; echo *****; \il            List target info and list libraries  
  \is target.o                   List sections for target.o  
  \is target.o ~ f               Same but for functions only  
  \is target.o ~ f~ someF[0]     Extract function address

FUNCTION ANALYSIS

s `\is target.o ~ f~ someF[0]`   Jump to function  
af; pdf                          Analyze and disassembly

FUNCTION INSTRUMENTATION

\dtf `s` ^x                      Trace the function using frida, print one argument as hex value  
\dxc `s` 0xffffffff              Call the funtion with the param 0xffffffff

DEBUG

\db (<addr>|<sym>)              List or place breakpoint
\db- (<addr>|<sym>)|*           Remove breakpoint(s)
\dc                             Continue breakpoints or resume a spawned process
\dm[.|j|*]                      Show memory regions
\dpt                            Show threads

TRACING

\dt (<addr>|<sym>) ..           Trace list of addresses or symbols
                                Example: \dt <address> Triggers every time the address is executed
\dtf <addr> [fmt]               Trace address with format (^ixzO) (see dtf?)
                                Example: \dtf 0x00000010bb7777 xzOO
\dtr <address> <format>         Trace registers values

SCRIPTING

\. script                       Run script
\eval code..                    Evaluate Javascript code in agent side

RESOLVE THINGS AT RUNTIME

\eval new ApiResolver('objc').enumerateMatchesSync('*[* sharedTwitter]')
This will resolve the class names+methods+address that matches the provided query
(all methods matching 'sharedTwitter' from all classes)

FILE DESCRIPTOR MANIPULATION

\dd[j-][fd] ([newfd])       List, dup2 or close filedescriptors (ddj for JSON) 

Replace file descriptors (change input and output destinations of ANY function)
- Start the target app
- While suspended:
    \dmas output.txt                                Allocates the string "output.txt" in the heap
    \dxc open <addres from prev command> 0x202      Call open with given permissions
    \dd <fd from prev command> 1                    Replace the fd=1(stdout) with the result of the previous command
    \dc                                             Resume. Now all the output goes to the specified file!