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╚═╝╚═════╝ ╚══════╝╚══════╝╚══════╝╚══════╝╚═╝╚═╝ ╚═══╝ ╚═════╝
iblessingis an iOS security exploiting toolkit, it mainly includes application information gathering, static analysis and dynamic analysis.iblessingis based on unicorn engine, capstone engine and keystone engine.
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🔥 Cross-platform: Tested on macOS and Ubuntu.
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iOS App static info extract, including metadata, deeplinks, urls, etc.
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Mach-O parser and dyld symbol bind simulator
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Objective-C class realizing and parsing
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Scanners making dynamic analysis for arm64 assembly code and find key information or attack surface
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Scanners using unicorn to partially simulate Mach-O arm64 code execution and find some features
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Generators that can provide secondary processing on scanner's report to start a query server, or generate script for IDA
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Super objc_msgSend xrefs scanner 😄
- objc methods and subs (such as blocks) emulation to generate xrefs like flare-emu
- objc function wrapper detect and ida usercall generate
- objc_msgSend sub functions analysis
- objc block to objc_msgSend xrefs in args and capture list
- report format including json, etc.
- Swift class and method parsing
- following branches and calls
- SimProcedures for extern symbols
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Tests
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Android Scanners Suport
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Diagnostic logs
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More flexible scanner infrastructure for new scanner plugins
In case you need support regarding iblessing or anything associated with it, you can:
- create an issue and provide necessary information
- contact Sou1gh0st on Twitter
- send mail to xiuyutong1994#163.com
- send mail to xiuyutong1994#gmail.com
- 2021.06.27 - New arch (Shell Programm + Core Library) and plugin support (beta)
- 2021.01.23 - Add method signatures for system libraries (Foundation, UIKit), further enhanced analytical capabilities (https://github.com/Soulghost/iblessing/wiki/System-Libraries-(Foundation,-UIKit)-Simple-SimProcedure)
- 2020.11.30 - Objc reflection info (https://github.com/Soulghost/iblessing/wiki/Objc-Reflection-Info)
- 2020.10.24 - Objc call snapshots (https://github.com/Soulghost/iblessing/wiki/Objc-Call-Snapshots)
- 2020.10.04 - Objc category list support
- 2020.09.28 - Static library and fat mach-o support
- 2020.09.22 - Basic program state and condition branching
- 2020.09.04 - Method validation, infering, objc_msgSendSuper support
- 2020.08.11 - Now iblessing is a cross-platform tool, support both macOS and Linux 😆
- 2020.08.08 - Improve objc_msgSend xref scanner, add sub xref supoort, including block arguments and capture list
- 2020.07.30 - Improve symbol-wrapper scanner, and add ida scripts for symbol wrapper rename and prototype modification
- 2020.07.21 - First release
- You can download the pre-released iblessing binary and enjoy it.
- run chmod +x for the binary
- For more tutorails, please check the Documentation & Help below.
- iblessing-darwin-all/iblessing-linux
- untar iblessing-framework.tar.gz
- iblessing-darwin/iblessing-linux + libiblessing-core.dylib/libiblessing-core.so
- untar iblessing-framework.tar.gz
- your binary + libiblessing-core.dylib/libiblessing-core.so + include/iblessing-core
- sample code: iblessing-core/otool.cpp
- Platform: macOS, Linux
To get started compiling iblessing, please follow the steps below:
git clone --recursive -j4 https://github.com/Soulghost/iblessing
cd iblessing
./compile-cmake.sh
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Scanners
- Scan for AppInfos
⚠️ Not currently available on Linux - Scan for Class XREFs
- Scan for All objc_msgSend XREFs
- Scan for Simple Symbol Wrappers
- Scan for AppInfos
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Generators
If there are any errors, you can manully compile capstone and unicorn, then drag libcapstone.a and libunicorn.a to the Xcode project's vendor/libs.
If all of this run successfully, you can find the binary in build directory:
> ls ./build
iblessing
> file ./build/iblessing
./build/iblessing: Mach-O 64-bit executable x86_64
$ iblessing -h
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╚═╝╚═════╝ ╚══════╝╚══════╝╚══════╝╚══════╝╚═╝╚═╝ ╚═══╝ ╚═════╝
[***] iblessing iOS Security Exploiting Toolkit Beta 0.1.1 (http://blog.asm.im)
[***] Author: Soulghost (高级页面仔) @ (https://github.com/Soulghost)
Usage: iblessing [options...]
Options:
-m, --mode mode selection:
* scan: use scanner
* generator: use generator
-i, --identifier choose module by identifier:
* <scanner-id>: use specific scanner
* <generator-id>: use specific generator
-f, --file input file path
-o, --output output file path
-l, --list list available scanners
-d, --data extra data
-h, --help Shows this page
A scanner is a component used to output analysis report through static and dynamic analysis of binary files, for example, the objc-msg-xref scanner can dynamiclly analyze most objc_msgSend cross references.
[*] Scanner List:
- app-info: extract app infos
- objc-class-xref: scan for class xrefs
- objc-msg-xref: generate objc_msgSend xrefs record
- predicate: scan for NSPredicate xrefs and sql injection surfaces
- symbol-wrapper: detect symbol wrappers
A generator is a component that performs secondary processing on the report generated by the scanner, for example, it can generate IDA scripts based on the the objc-msg-xref scanner's cross references report.
[*] Generator List:
- ida-objc-msg-xref: generator ida scripts to add objc_msgSend xrefs from objc-msg-xref scanner's report
- objc-msg-xref-server: server to query objc-msg xrefs
- objc-msg-xref-statistic: statistics among objc-msg-send reports
> iblessing -m scan -i app-info -f <path-to-app-bundle>
Let's take WeChat as an example:
> iblessing -m scan -i app-info -f WeChat.app
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat.app
[*] start App Info Scanner
[+] find default plist file Info.plist!
[*] find version info: Name: 微信(WeChat)
Version: 7.0.14(18E226)
ExecutableName: WeChat
[*] Bundle Identifier: com.tencent.xin
[*] the app allows HTTP requests **without** exception domains!
[+] find app deeplinks
|-- wechat://
|-- weixin://
|-- fb290293790992170://
|-- weixinapp://
|-- prefs://
|-- wexinVideoAPI://
|-- QQ41C152CF://
|-- wx703://
|-- weixinULAPI://
[*] find app callout whitelist
|-- qqnews://
|-- weixinbeta://
|-- qqnewshd://
|-- qqmail://
|-- whatsapp://
|-- wxwork://
|-- wxworklocal://
|-- wxcphonebook://
|-- mttbrowser://
|-- mqqapi://
|-- mqzonev2://
|-- qqmusic://
|-- tenvideo2://
...
[+] find 507403 string literals in binary
[*] process with string literals, this maybe take some time
[+] find self deeplinks URLs:
|-- weixin://opennativeurl/devicerankview
|-- weixin://dl/offlinepay/?appid=%@
|-- weixin://opennativeurl/rankmyhomepage
...
[+] find other deeplinks URLs:
|-- wxpay://f2f/f2fdetail
|-- file://%@?lang=%@&fontRatio=%.2f&scene=%u&version=%u&type=%llu&%@=%d&qqFaceFolderPath=%@&platform=iOS&netType=%@&query=%@&searchId=%@&isHomePage=%d&isWeAppMore=%d&subType=%u&extParams=%@&%@=%@&%@=%@
...
[*] write report to path /opt/one-btn/tmp/apps/WeChat/Payload/WeChat.app_info.iblessing.txt
> ls -alh
-rw-r--r--@ 1 soulghost wheel 29K Jul 23 14:01 WeChat.app_info.iblessing.txt
Notice: ARM64 Binaries Only
iblessing -m scan -i objc-class-xref -f <path-to-binary> -d 'classes=<classname_to_scan>,<classname_to_scan>,...'
> restore-symbol WeChat -o WeChat.restored
> iblessing -m scan -i objc-class-xref -f WeChat.restored -d 'classes=NSPredicate'
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat
[+] detect mach-o header 64
[+] detect litten-endian
[*] start Objc Class Xref Scanner
[*] try to find _OBJC_CLASS_$_NSPredicate
[*] Step 1. locate class refs
[+] find _OBJC_CLASS_$_NSPredicate at 0x108eb81d8
[*] Step 2. find __TEXT,__text
[+] find __TEXT,__text at 0x4000
[*] Step 3. scan in __text
[*] start disassembler at 0x100004000
[*] \ 0x1002e1a50/0x1069d9874 (2.71%) [+] find _OBJC_CLASS_$_NSPredicate ref at 0x1002e1a54
...
[*] Step 4. symbolicate ref addresses
[+] _OBJC_CLASS_$_NSPredicate -|
[+] find _OBJC_CLASS_$_NSPredicate ref -[WCWatchNotificationMgr addYoCount:contact:type:] at 0x1002e1a54
[+] find _OBJC_CLASS_$_NSPredicate ref -[NotificationActionsMgr handleSendMsgResp:] at 0x1003e0e28
[+] find _OBJC_CLASS_$_NSPredicate ref -[FLEXClassesTableViewController searchBar:textDidChange:] at 0x1004a090c
[+] find _OBJC_CLASS_$_NSPredicate ref +[GameCenterUtil parameterValueForKey:fromQueryItems:] at 0x1005a823c
[+] find _OBJC_CLASS_$_NSPredicate ref +[GameCenterUtil getNavigationBarColorForUrl:defaultColor:] at 0x1005a8cd8
...
Notice: ARM64 Binaries Only
iblessing -m scan -i objc-msg-xref -f <path-to-binary>
iblessing -m scan -i objc-msg-xref -f WeChat -d 'antiWrapper=1'
The anti-wrapper mode will detect objc_msgSend wrappers and make transforms, such as:
; __int64 __usercall objc_msgSend_X0_X22_X20@<X0>(void *obj@<X0>, const char *sel@<X22>, id anyObj@<X20>, ...)
objc_msgSend_X0_X22_X20:
MOV X1, X22
MOV X2, X20
B objc_msgSend
> iblessing -m scan -i objc-msg-xref -f WeChat -d 'antiWrapper=1'
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat
[+] detect mach-o header 64
[+] detect litten-endian
[*] !!! Notice: enter anti-wrapper mode, start anti-wrapper scanner
[*] start Symbol Wrapper Scanner
[*] try to find wrappers for_objc_msgSend
[*] Step1. find __TEXT,__text
[+] find __TEXT,__text at 0x100004000
[+] mapping text segment 0x100000000 ~ 0x107cb0000 to unicorn engine
[*] Step 2. scan in __text
[*] start disassembler at 0x100004000
[*] / 0x1069d986c/0x1069d9874 (100.00%)
[*] reach to end of __text, stop
[+] anti-wrapper finished
[*] start ObjcMethodXrefScanner Exploit Scanner
[*] Step 1. realize all app classes
[*] realize classes 14631/14631 (100.00%)
[+] get 667318 methods to analyze
[*] Step 2. dyld load non-lazy symbols
[*] Step 3. track all calls
[*] progress: 667318 / 667318 (100.00%)
[*] Step 4. serialize call chains to file
[*] saved to /opt/one-btn/tmp/apps/WeChat/Payload/WeChat_method-xrefs.iblessing.txt
> ls -alh WeChat_method-xrefs.iblessing.txt
-rw-r--r-- 1 soulghost wheel 63M Jul 23 14:46 WeChat_method-xrefs.iblessing.txt
> head WeChat_method-xrefs.iblessing.txt
iblessing methodchains,ver:0.2;
chainId,sel,prefix,className,methodName,prevMethods,nextMethods
182360,0x1008a0ab8,+[A8KeyControl initialize],+,A8KeyControl,initialize,[],[4429#0x1008a1064@4376#0x1008a1050@13769#0x1008a10d0]
182343,0x1008a0ad0,+[A8KeyControl_QueryStringTransferCookie initialize],+,A8KeyControl_QueryStringTransferCookie,initialize,[],[4429#0x1008a1064@4376#0x1008a1050@13769#0x1008a10d0]
145393,0x1008c2220,+[A8KeyResultCookieWriter initWithDomain:weakWebView:andCompleteBlock:],+,A8KeyResultCookieWriter,initWithDomain:weakWebView:andCompleteBlock:,[145386#0x10036367c],[]
145396,0x1008c3df8,+[A8KeyResultCookieWriter setA8KeyCookieExpireTime:],+,A8KeyResultCookieWriter,setA8KeyCookieExpireTime:,[145386#0x1003636e8],[]
145397,0x1008c27e8,+[A8KeyResultCookieWriter writeCompleteMarkerCookieValue:forKey:],+,A8KeyResultCookieWriter,writeCompleteMarkerCookieValue:forKey:,[145386#0x10036380c],[]
253456,0x0,+[AAOperationReq init],+,AAOperationReq,init,[253455#0x1039a9d30],[]
253457,0x0,+[AAOperationReq setBaseRequest:],+,AAOperationReq,setBaseRequest:,[253455#0x1039a9d8c],[]
186847,0x0,+[AAOperationRes length],+,AAOperationRes,length,[186845#0x10342aa54],[]
The report can be used by the generators, now let's go.
You can start a server through iblessing's objc-msg-xref-server generator to query all objc_msgSend xrefs.
iblessing -m generator -i objc-msg-xref-server -f <path-to-report-generated-by-objc-msg-xref-scanner>
The default listening address is 127.0.0.1:2345, you can specify it by -d option.
iblessing -m generator -i objc-msg-xref-server -f WeChat_method-xrefs.iblessing.txt -d 'host=0.0.0.0;port=12345'
Notice: the objc-msg-xref is based on unicorn, to speed up the analyze, we do not follow any calls, so the result is partially missing.
> iblessing -m generator -i objc-msg-xref-server -f WeChat_method-xrefs.iblessing.txt
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat_method-xrefs.iblessing.txt
[*] start ObjcMsgXREFServerGenerator
[*] load method-chain db for version iblessing methodchains,ver:0.2;
[*] table keys chainId,sel,prefix,className,methodName,prevMethods,nextMethods
[-] bad line 104467,0x0,+[TPLock P, ],+,TPLock,P, ,[104426#0x1043b9904],[]
[-] bad line 114905,0x0,?[0x108ce1578 (,],?,0x108ce1578,(,,[114900#0x1011e8c68],[]
[-] bad line 104464,0x0,?[? P, ],?,?,P, ,[104426#0x1043b98a8],[]
[-] bad line 139234,0x0,?[? X
[-] bad line ],?,?,X
[-] bad line ,[139205#0x1013c222c],[]
[+] load storage from disk succeeded!
[*] listening on http://127.0.0.1:2345
Next you can open http://127.0.0.1:2345 with a browser to query any objc_msgSend xrefs you like:
You can add objc_msgSend xrefs generated from objc-msg-xref scanner to make your reverse engineering journey more faster and comfortable.
iblessing -m generator -i ida-objc-msg-xref -f <path-to-report-generated-by-objc-msg-xref-scanner>
Notice: the objc-msg-xref is based on unicorn, to speed up the analyze, we do not follow any calls, so the result is partially missing.
> iblessing -m generator -i ida-objc-msg-xref -f WeChat_method-xrefs.iblessing.txt
[*] set output path to /opt/one-btn/tmp/apps/WeChat/Payload
[*] input file is WeChat_method-xrefs.iblessing.txt
[*] start IDAObjMsgXREFGenerator
[*] load method-chain db for version iblessing methodchains,ver:0.2;
[*] table keys chainId,sel,prefix,className,methodName,prevMethods,nextMethods
[-] bad line 104467,0x0,+[TPLock P, ],+,TPLock,P, ,[104426#0x1043b9904],[]
[-] bad line 114905,0x0,?[0x108ce1578 (,],?,0x108ce1578,(,,[114900#0x1011e8c68],[]
[-] bad line 104464,0x0,?[? P, ],?,?,P, ,[104426#0x1043b98a8],[]
[-] bad line 139234,0x0,?[? X
[-] bad line ],?,?,X
[-] bad line ,[139205#0x1013c222c],[]
[+] load storage from disk succeeded!
[*] Generating XREF Scripts ...
[*] saved to /opt/one-btn/tmp/apps/WeChat/Payload/WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
> ls -alh WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
-rw-r--r-- 1 soulghost wheel 23M Jul 23 16:16 WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
> head WeChat_method-xrefs.iblessing.txt_ida_objc_msg_xrefs.iblessing.py
def add_objc_xrefs():
ida_xref.add_cref(0x10036367c, 0x1008c2220, XREF_USER)
ida_xref.add_cref(0x1003636e8, 0x1008c3df8, XREF_USER)
ida_xref.add_cref(0x10036380c, 0x1008c27e8, XREF_USER)
ida_xref.add_cref(0x103add16c, 0x700006e187a8, XREF_USER)
ida_xref.add_cref(0x102cbee0c, 0x101143ee8, XREF_USER)
ida_xref.add_cref(0x10085c92c, 0x1005e9360, XREF_USER)
ida_xref.add_cref(0x10085c8bc, 0x1005e9274, XREF_USER)
ida_xref.add_cref(0x10085c8dc, 0x1005e92bc, XREF_USER)
ida_xref.add_cref(0x10085c8cc, 0x1005e9298, XREF_USER)
Next open your IDA -> File -> Script File and load the script, this step may take a long time. And when it is done, you can find many xrefs for objc method:
A Mach-O file may contain multiple wrappers of commonly used dynamic library imported symbols, such as:
__text:00000001003842D8 sub_1003842CC ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+168↑p
__text:00000001003842D8 ; -[BDARVLynxTracker eventV3:params:adExtraData:]+214↑p ...
__text:00000001003842D8 MOV X1, X27
__text:00000001003842DC MOV X2, X19
__text:00000001003842E0 B objc_msgSend
We can convert the wrapper by usercall:
__text:00000001003842CC ; id __usercall objc_msgSend_61@<X0>(id@<X23>, const char *@<X28>, ...)
__text:00000001003842CC _objc_msgSend_61 ; CODE XREF: -[BDARVLynxTracker eventV3:params:adExtraData:]+2CC↑p
__text:00000001003842CC ; -[BDARVLynxTracker eventV3:params:adExtraData:]+320↑p ...
__text:00000001003842CC MOV X0, X23
__text:00000001003842D0 MOV X1, X28
__text:00000001003842D4 B objc_msgSend
The scanner can generate a report to record all wrappers, then you can use ida-symbol-wrapper-naming generator to generate ida scripts and implement this wrapper rename and prototype change.
iblessing -m scan -i symbol-wrapper -f <path-to-binary> -d 'symbols=_objc_msgSend,_objc_retain,_objc_release'
iblessing -m scan -i symbol-wrapper -f <path-to-binary> -d 'symbols=*'
We will take TikTok China as an example:
> iblessing -m scan -i symbol-wrapper -f /opt/one-btn/tmp/apps/抖音短视频/Payload/Aweme -d 'symbols=*'
[*] set output path to /Users/soulghost/Desktop/git/iblessing-public/iblessing/build/Debug
[*] input file is /opt/one-btn/tmp/apps/抖音短视频/Payload/Aweme
[+] detect mach-o header 64
[+] detect litten-endian
[*] start Symbol Wrapper Scanner
[*] try to find wrappers for_objc_autoreleaseReturnValue, _objc_msgSend, _objc_release, _objc_releaseAndReturn, _objc_retain, _objc_retainAutorelease, _objc_retainAutoreleaseAndReturn, _objc_retainAutoreleaseReturnValue, _objc_retainAutoreleasedReturnValue
[*] Step1. find __TEXT,__text
[+] find __TEXT,__text at 0x100004000
[+] mapping text segment 0x100000000 ~ 0x106da0000 to unicorn engine
[*] Step 2. scan in __text
[*] start disassembler at 0x100004000
[*] / 0x106b68a54/0x106b68a58 (100.00%)
[*] reach to end of __text, stop
[*] Step 3. serialize wrapper graph to file
[*] saved to /Users/soulghost/Desktop/git/iblessing-public/iblessing/build/Debug/Aweme_wrapper-graph.iblessing.txt
> head Aweme_wrapper-graph.iblessing.txt
iblessing symbol-wrappers,ver:0.1;
wrapperId;address;name;prototype
0;0x100022190;_objc_retainAutoreleasedReturnValue;id __usercall f@<x0>(id@<x0>)
1;0x100022198;_objc_retainAutoreleasedReturnValue;id __usercall f@<x0>(id@<x0>)
2;0x1000221a0;_objc_release;id __usercall f@<x0>(id@<x22>)
3;0x1000221a8;_objc_msgSend;id __usercall f@<x0>(id@<x0>, const char*@<x20>, ...)
4;0x100022448;_objc_release;id __usercall f@<x0>(id@<x21>)
5;0x10009c19c;_objc_autoreleaseReturnValue;id __usercall f@<x0>(id@<x0>)
6;0x1000b6f94;_objc_msgSend;id __usercall f@<x0>(id@<x0>, const char*@<x1>, ...)
7;0x100100248;_objc_autoreleaseReturnValue;id __usercall f@<x0>(id@<x0>)
Next, we can generate ida scripts from this report.
iblessing -m generator -i ida-symbol-wrapper-naming -f <path-to-report-from-symbol-wrapper>
> iblessing -m generator -i ida-symbol-wrapper-naming -f Aweme_wrapper-graph.iblessing.txt
[*] set output path to /Users/soulghost/Desktop/git/iblessing-public/iblessing/build/Debug
[*] input file is Aweme_wrapper-graph.iblessing.txt
[*] start IDAObjMsgXREFGenerator
[*] load symbol-wrappers db for version iblessing symbol-wrappers,ver:0.1;
[*] table keys wrapperId;address;name;prototype
[*] Generating Naming Scripts ...
[*] saved to /Users/soulghost/Desktop/git/iblessing-public/iblessing/build/Debug/Aweme_wrapper-graph.iblessing.txt_ida_symbol_wrapper_naming.iblessing.py
> head Aweme_wrapper-graph.iblessing.txt_ida_symbol_wrapper_naming.iblessing.py
def namingWrappers():
idc.set_name(0x100022190, '_objc_retainAutoreleasedReturnValue', ida_name.SN_FORCE)
idc.apply_type(0x100022190, idc.parse_decl('id __usercall f@<x0>(id@<x0>)', idc.PT_SILENT))
idc.set_name(0x100022198, '_objc_retainAutoreleasedReturnValue', ida_name.SN_FORCE)
idc.apply_type(0x100022198, idc.parse_decl('id __usercall f@<x0>(id@<x0>)', idc.PT_SILENT))
idc.set_name(0x1000221a0, '_objc_release', ida_name.SN_FORCE)
idc.apply_type(0x1000221a0, idc.parse_decl('id __usercall f@<x0>(id@<x22>)', idc.PT_SILENT))
idc.set_name(0x1000221a8, '_objc_msgSend', ida_name.SN_FORCE)
idc.apply_type(0x1000221a8, idc.parse_decl('id __usercall f@<x0>(id@<x0>, const char*@<x20>, ...)', idc.PT_SILENT))
idc.set_name(0x100022448, '_objc_release', ida_name.SN_FORCE)
Next open your IDA -> File -> Script File and load the script, this step may take a long time. And when it is done, You can observe some decompiled code changes:
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