Guest Post @ hexblog


Author: David Zimmer
Date: 12.20.13 - 5:06pm



Just a heads up I did a guest post over at hexblog. (local pdf)

I also did a some bench marking and played around with some optimization ideas a bit. Getting the number of functions in the idb using a two way CopyData calls was 7794 ticks. CopyData one way and sendmessage return value 5660, and just using SendMessage with numeric args alone 2905. (On my system 1 tick = 1/3579545 seconds).



SendMessage using a custom message and numeric args only was the best performance, but the prototype only allows for passing a function call index and one numeric arg. (Apparently you cant get cute and multiplex a function call as the low byte of the uMsg or it wont be delivered to the remote process and I am to lazy to register that many custom messages just to gain a second arg). As is, I was able to implement 13 of the 36 api over to fast call. If I start using memory mapped files, its possible to switch them all away from copydata, but it would take more benchmarking to see if that had value. Also the text based command structure is easier to debug than a binary format that would be used with memmapped files, so thats a consideration too.

I still stand by my decision to move away from sockets. The code is simplier and its rare to need to control it from another machine. I also already have this same api implemented at the end of a socket interface in my IDAVBScript plugin. One project that uses it is the OllySync plugin which will sync your ida disasm view as you step through code or hit break points in Olly in a VM. (Great for malware analysis)






Comments: (0)

 
Leave Comment:
Name:
Email: (not shown)
Message: (Required)
Math Question: 7 + 77 = ? followed by the letter: N 



Twitter
RSS
About Me
More Blogs
Main Site
Posts: (year)
2021 (1)
     VB App object
2020 (8)
     AutoIT versions
     IDA JScript 2
     Using VB6 Obj files from C
     Vb6 PCode Internals
     Vb6 Runtime ForLoop Disasm
     VB6 Pcode - For Loops
     Yara Corrupt Imports
     Yara Undefined values
2019 (12)
     Yara WorkBench
     SafeArrayGetVartype
     vbdec dbg updates
     vb6 PCode NOP
     vb6 API and call backs
     how pcode works Pt1
     PrintFile
     ImpAdCallNonVirt
     Reversing PCode Args
     VB6 PCode Disassembly
     VB6 PCode Debugger
     UConnect Disable Cell Modem
2017 (5)
     IDA python over IPC
     dns wildcard blocking
     64bit IDA Plugins
     anterior lines
     misc news/updates
2016 (4)
     KANAL Mod
     Decoders again
     CDO.Message Breakpoints
     SysAnalyzer Updates
2015 (6)
     SysAnalyzer and Site Updates
     crazy decoder
     ida js w/dbg
     flash patching #2
     JS Graphing
     packet reassembly
2014 (5)
     Delphi IDA Plugin
     scdbg IDA integration
     API Hash Database
     Winmerge plugin
     IDACompare Updates
2013 (9)
     Guest Post @ hexblog
     TCP Stream Reassembly
     SysAnalyzer Updates
     Apilogger Video
     Shellcode2Exe trainer
     scdbg updates
     IDA Javascript w/IDE
     Rop Analysis II
     scdbg vrs ROP
2012 (13)
     flash patching
     x64 Hooks
     micro hook
     jmp api+5 *2
     SysAnalyzer Updates
     InjDll runtime config
     C# Asm/Dsm Library
     Shellcode Hook Detection
     Updates II
     findDll
     Java Hacking
     Windows 8
     Win7 x64
2011 (19)
     Graphing ideas
     .Net Hacking
     Old iDefense Releases
     BootLoaders
     hll shellcode
     ActionScript Tips
     -patch fu
     scdbg ordinal lookup
     scdbg -api mode
     Peb Module Lists
     scdbg vrs Process Injection
     GetProcAddress Scanner
     scdbg fopen mode
     scdbg findsc mode
     scdbg MemMonitor
     demo shellcodes
     scdbg download
     api hashs redux
     Api hash gen
2010 (11)
     Retro XSS Chat Codes
     Exe as DLL
     Olly Plugins
     Debugging Explorer
     Attach to hidden process
     JS Refactoring
     Asm and Shellcode in CSharp
     Fancy Return Address
     PDF Stream Dumper
     Malcode Call API by Hash
     WinDbg Cheat Sheet
2009 (1)
     GPG Automation