Frida instrumentation

Frida trace and memory patch

Trace a specific MODULE!OFFSET

frida_venv-14.2.18\Scripts\frida-trace-script.py -U -f 'com.xxx.xxx.xxxx' -a 'Myxxx!0x100000'

If you are getting some troubles, why not using the passionfruit console to get the trace with the offsets. After that, analyze them in IDA or GHIDRA ;)

Tip: press G and paste the full offset => My xxxxx!0x16e794

Or using the frida-trace utility to instrument the execution ... (change the .js file on __handlers__ folder).

frida-trace-script.py -U -f 'com.xxx.xxx.xxxx' -a 'My xxxxx!0x16e794'

After that, you can patch in memory your ipa from, 0x10016E790 to 0x10016E7AC.

/*
__text:000000010016E78C                 BL              sub_1001DC3DC
__text:000000010016E790                 BL              sub_100361F34
__text:000000010016E794                 TBNZ            W0, #0, loc_10016E7B0
__text:000000010016E798                 BL              sub_100362240
__text:000000010016E79C                 TBNZ            W0, #0, loc_10016E7B0
__text:000000010016E7A0                 BL              sub_100362370
__text:000000010016E7A4                 TBNZ            W0, #0, loc_10016E7B0
__text:000000010016E7A8                 BL              sub_100362548
__text:000000010016E7AC                 TBZ             W0, #0, loc_10016E934
*/

var addr = Module.getBaseAddress("My xxxx").add("0x16e790");
console.log(Module.findBaseAddress('My xxxx')); //write app base-addr
Memory.protect(addr, 0x1000, "rwx");
var writer = new Arm64Writer(addr);
writer.putNop();
writer.putNop();
writer.putNop();
writer.putNop();
writer.putNop();
writer.putNop();
writer.putNop();
writer.putNop();
writer.flush();

Run it.

 frida -U -f 'com.xxxx.xxxx.xxxxx' -l frida.js --no-pause

Jailbreak detector + bypass

In order to detect the function are doing jailbreak detection you can use this script available on frida code share repository.

Frida CodeShare

frida -U --codeshare lichao890427/jailbreak-detect-trace -f 'com.xxx.xxx.xxx' --no-pause

After that, you can do the steps executed above: reversing it and patch it in memory. 😎

In addition, You can try to use this script to bypass jailbreak detection.

/*
 * usage: frida -l bypass-jailbreak.js -Uf com.foo.bar
 */


var paths = [
    "/etc/apt",
    "/Library/MobileSubstrate/MobileSubstrate.dylib",
    "/Applications/Cydia.app",
    "/Applications/blackra1n.app",
    "/Applications/FakeCarrier.app",
    "/Applications/Icy.app",
    "/Applications/IntelliScreen.app",
    "/Applications/MxTube.app",
    "/Applications/RockApp.app",
    "/Applications/SBSetttings.app",
    "/private/var/lib/apt/",
    "/Applications/WinterBoard.app",
    "/usr/sbin/sshd",
    "/private/var/tmp/cydia.log",
    "/usr/binsshd",
    "/usr/libexec/sftp-server",
    "/Systetem/Library/LaunchDaemons/com.ikey.bbot.plist",
    "/System/Library/LaunchDaemons/[e-mail]",
    "/var/log/syslog",
    "/bin/bash",
	"/var/checkra1n.dmg",
    "/bin/sh",
	"/Applications/Snoop-itConfig.app",
    "/etc/ssh/sshd_config",
	"/private/etc/ssh/sshd_config",
    "/usr/libexec/ssh-keysign",
    "/Library/MobileSubstrate/DynamicLibraries/Veency.plist",
    "/System/Library/LaunchDaemons/com.ikey.bbot.plist",
    "/private/var/stash",
    "/usr/bin/cycript",
    "/usr/bin/ssh",
    "/usr/bin/sshd",
    "/var/cache/apt",
    "/var/lib/cydia",
    "/var/tmp/cydia.log",
    "/Applications/SBSettings.app",
    "/Library/MobileSubstrate/DynamicLibraries/LiveClock.plist",
    "/System/Library/LaunchDaemons/com.saurik.Cydia.Startup.plist",
    "/private/var/lib/apt",
    "/private/var/lib/cydia",
    "/private/var/mobile/Library/SBSettings/Themes",
    "/var/lib/apt",
    "/private/jailbreak.txt",
    "/bin/su",
    "/pguntether",
    "/usr/sbin/frida-server",
    "/private/Jailbreaktest.txt",
    "/var/mobile/Media/.evasi0n7_installed"
];

try {
    var resolver = new ApiResolver('objc');

    resolver.enumerateMatches('*[* *jail**]', {
        onMatch: function(match) {
            var ptr = match["address"];
            Interceptor.attach(ptr, {
                onEnter: function() {},
                onLeave: function(retval) {
                    retval.replace(0x0);
                }
            });
        },
        onComplete: function() {}
    });

    resolver.enumerateMatches('*[* fileExistsAtPath*]', {
        onMatch: function(match) {
            var ptr = match["address"];
            Interceptor.attach(ptr, {
                onEnter: function(args) {
                    var path = ObjC.Object(args[2]).toString();
                    this.jailbreakCall = false;
                    for (var i = 0; i < paths.length; i++) {
                        if (paths[i] == path) {
                            this.jailbreakCall = true;
                        }
                    }
                },
                onLeave: function(retval) {
                    if (this.jailbreakCall) {
                        retval.replace(0x0);
                    }
                }
            });
        },
        onComplete: function() {}
    });

    resolver.enumerateMatches('*[* canOpenURL*]', {
        onMatch: function(match) {
            var ptr = match["address"];
            Interceptor.attach(ptr, {
                onEnter: function(args) {
                    var url = ObjC.Object(args[2]).toString();
                    this.jailbreakCall = false;
                    if (url.indexOf("cydia") >= 0) {
                        this.jailbreakCall = true;
                    }
                },
                onLeave: function(retval) {
                    if (this.jailbreakCall) {
                        retval.replace(0x0);
                    }
                }
            });
        },
        onComplete: function() {}
    });

    var response = {
        type: 'sucess',
        data: {
            message: "[!] Jailbreak Bypass success"
        }
    };
    send(response);
} catch (e) {
    var message = {
        type: 'exception',
        data: {
            message: '[!] Jailbreak bypass script error: '
        }
    };
    send(message);
}