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OpenRCE Articles

Memoryze Memory Forensics Tool Created: Wednesday, November 26 2008 20:06.40 CST
Author: peter # Views: 43976

The goal of this article is to demonstrate how simple malware analysis can be using Memoryze and some good old fashion common sense. Readers should have some knowledge of how malware works, and be somewhat familiar with Memoryze. A good place to familiarize yourself with Memoryze is the user guide included in the installer.

Memoryze is designed to aid in memory analysis in incident response scenarios. However, it has many useful features that can be utilized when doing malware analysis. Memoryze is special in that it does not rely on API calls. Instead Memoryze parses the operating systems' internal structures to determine for itself what the operating system and its running processes and drivers are doing.

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    Username Comment Excerpt Date
cirix good job,thx Wednesday, August 8 2012 21:33.24 CDT
zezo010 I'm waite for next lessons. Nice work, thanks! Sunday, August 14 2011 04:26.00 CDT
eaescob Very nice work, thanks! Monday, June 27 2011 19:28.08 CDT
slolurner For folks coming late to the party like me, I w... Monday, October 25 2010 10:40.36 CDT
cyberpsych0z nice thing :) Sunday, September 26 2010 07:14.56 CDT

The Molecular Virology of Lexotan32: Metamorphism Illustrated Created: Thursday, August 16 2007 16:58.00 CDT
Author: orr # Views: 42507

This paper is a direct descendent of my previous one regarding the metamorphic engine of the W32.Evol virus. I advise you to take a look at it before reading this one, or at least be acquainted with the subject of metamorphism. The focus of this paper is the special engine of the Lexotan32 virus.

The virus was released in 29A#6 Virus Magazine in 2002, the Annus Mirabilis of metamorphic viruses. The virus was created by the prolific VX coder, Vecna, and was one of the last complex creations of this kind. I could further elaborate on the genealogy of this virus, but I think it is sufficient to say that this virus is a culmination of many of the techniques developed throughout the author's career.

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    Username Comment Excerpt Date
redbone good information .... Tuesday, July 12 2011 02:56.10 CDT
tgnice cool :) Saturday, June 18 2011 03:18.50 CDT
  lazyworm very nice!I need it. Wednesday, June 30 2010 20:25.49 CDT
m4dnut it's so cool~! thnaks for your effots. i alway... Wednesday, July 9 2008 20:32.17 CDT
c0ck3dpist0l it's cool! Thanks for sharing! Tuesday, April 29 2008 07:54.10 CDT

Defeating HyperUnpackMe2 With an IDA Processor Module Created: Thursday, February 22 2007 19:21.58 CST
Author: RolfRolles # Views: 55782

This article is about breaking modern executable protectors. The target, a crackme known as HyperUnpackMe2, is modern in the sense that it does not follow the standard packer model of yesteryear wherein the contents of the executable in memory, minus the import information, are eventually restored to their original forms.

Modern protectors mutilate the original code section, use virtual machines operating upon polymorphic bytecode languages to slow reverse engineering, and take active measures to frustrate attempts to dump the process. Meanwhile, the complexity of the import protections and the amount of anti-debugging measures has steadily increased.

This article dissects such a protector and offers a static unpacker through the use of an IDA processor module and a custom plugin. The commented IDB files and the processor module source code are included. In addition, an appendix covers IDA processor module construction. In short, this article is an exercise in overkill.

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    Username Comment Excerpt Date
  ndaj3 RolfRolles: Thank you for Writing an Great tuto... Friday, September 4 2009 01:25.09 CDT
eirc Wow thanks a lotŁĄ Saturday, October 11 2008 05:00.28 CDT
h4x0r comprehensive analysis, thanks. for those no... Tuesday, May 15 2007 04:15.56 CDT
  PoincareLei good analysis.. expecting RolfRolles to wri... Wednesday, April 4 2007 06:26.45 CDT
bLaCkeye Impressive display of reverse engineering and c... Friday, February 23 2007 19:47.13 CST

The Viral Darwinism of W32.Evol Created: Tuesday, February 6 2007 14:26.08 CST
Author: Orr # Views: 50762

The W32.Evol virus was discovered around July 2000. Its name is derived from a string found in the virus, but much more can be implied from the name. Up until then, most of the viruses were using Polymorphic engines in order to hide themselves from Anti-Virus scanners. The engine would encrypt the virus with a different key on every generation, and would generate a small, variant decryptor that would consist of different operations but remain functionally equivalent. This technique was beginning to wear out as AV scanners would trace virus-decryption until it was decrypted in memory, visible and clear.

This article explores the features and functionality of the metamorphic engine of the Evol virus, the first virus to utilize a 'true' metamorphic engine according to Symantec.

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    Username Comment Excerpt Date
nEINEI good work~~ Friday, November 27 2009 04:04.08 CST
adityaks nice one man Wednesday, June 20 2007 06:07.58 CDT
Orr The mistake is in the paper and not in the engi... Friday, April 6 2007 16:02.00 CDT
eraser You are right MazeGen. [code] EB cb JMP cb ... Wednesday, April 4 2007 13:33.07 CDT
MazeGen Very interesting article, thanks. There's on... Friday, March 30 2007 02:57.38 CDT

Kernel User-Mode Debugging Support (Dbgk) Created: Wednesday, January 31 2007 12:05.10 CST
Author: AlexIonescu # Views: 34079

In part three of this three part article series, the kernel-mode interface to Windows debugging is dissected in detail. The reader is expected to have some basic knowledge of C and general NT Kernel architecture and semantics. Also, this is not an introduction on what debugging is or how to write a debugger. It is meant as a reference for experienced debugger writers, or curious security experts. The reader is expected to have some basic knowledge of C and general NT Kernel architecture and semantics. Also, this is not an introduction on what debugging is or how to write a debugger. It is meant as a reference for experienced debugger writers, or curious security experts.

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    Username Comment Excerpt Date
praveendarshanam good articles!! all partz r amazing!!! Friday, September 18 2009 15:18.19 CDT
flyingkisser very good,very powerful!So,where is part I and ... Tuesday, January 15 2008 20:17.43 CST
anonymouse so this is how some of the functions in syser o... Thursday, February 1 2007 23:35.29 CST
MohammadHosein thank you for these excellent series of articles Thursday, February 1 2007 15:29.03 CST
JasonGeffner Awesome job! I want a "part four"! :) Thursday, February 1 2007 13:56.34 CST

Windows Native Debugging Internals Created: Monday, November 13 2006 13:14.18 CST
Author: AlexIonescu # Views: 31743

In part two of this three part article series, the native interface to Windows debugging is dissected in detail. The reader is expected to have some basic knowledge of C and general NT Kernel architecture and semantics. Also, this is not an introduction on what debugging is or how to write a debugger. It is meant as a reference for experienced debugger writers, or curious security experts.

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    Username Comment Excerpt Date
halsten Thanks for sharing this! Keep it up (Y). -- ... Monday, January 22 2007 01:55.32 CST
msuiche That's a very pretty paper you wrote again ther... Monday, November 13 2006 15:40.46 CST

Windows User Mode Debugging Internals Created: Tuesday, October 31 2006 18:02.31 CST
Author: AlexIonescu # Views: 33582

The internal mechanisms of what allows user-mode debugging to work have rarely ever been fully explained. Even worse, these mechanisms have radically changed in Windows XP, when much of the support was re-written, as well as made more subsystem portable by including most of the routines in ntdll, as part of the Native API. This three part series will explain this functionality, starting from the Win32 (kernel32) viewpoint all the way down (or up) to the NT Kernel (ntoskrnl) component responsible for this support, called Dbgk, while taking a stop to the NT System Library (ntdll) and its DbgUi component.

The reader is expected to have some basic knowledge of C and general NT Kernel architecture and semantics. Also, this is not an introduction on what debugging is or how to write a debugger. It is meant as a reference for experienced debugger writers, or curious security experts.

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    Username Comment Excerpt Date
securex0 Awesome jobs! I am waiting next instruction. Sunday, April 15 2012 21:55.51 CDT
Civa Great article Alex! I wonder If you can explai... Tuesday, March 9 2010 05:07.34 CST
shijiaoan great Monday, May 4 2009 21:48.06 CDT
NeOXQuiCk Nice,thx for sharing.. its helped me a lot.. ... Tuesday, April 3 2007 17:55.47 CDT
tinybyte Nice stuff! Waiting for the sequels :) Friday, December 8 2006 15:25.33 CST

Archived Articles

Archived
Title   Author # Views Publish Date
Reversing Microsoft Visual C++ Part II: Classes, Methods and RTTI igorsk 121830 September 21 2006
Microsoft Patching Internals EliCZ 31790 April 26 2006
Reversing Microsoft Visual C++ Part I: Exception Handling igorsk 102610 March 6 2006
Technical Analysis of MS06-001 stephanc 19562 February 6 2006
FUTo peter 31039 January 5 2006
Plausible Deniability joestewart 21747 November 17 2005
Reverse Engineering Microsoft OLE joestewart 44890 September 12 2005
File Format Reversing - EverQuest II VPK daeken 49733 September 6 2005
WINLDRA.EXE: Reversing a Basic Encryption Algorithm Gerry 43686 August 23 2005
Reversing HDSpoof - A Tutorial smidgeonsoft 58020 August 2 2005
Creating IDA Plug-ins with C# or VB6 dzzie 44594 July 15 2005
Process Stalker vs. MS05-030 pedram 35514 July 6 2005
Introduction to IDAPython ero 51533 June 24 2005
OpenRCE Site Launch pedram 16666 June 17 2005

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