2013 Day2P13 LoB: Thread Local Storage (TLS)

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Have you ever wondered what happens when a C program is compiled and executed on a system? This three-day class by Xeno Kovah will investigate the life of a binary from birth as C source code to death as a process running in memory being terminated.

Topics will include but are not limited to:

*Scanning and tokenizing source code.

*Parsing a grammar and outputting assembly code.

*Different targets for x86 assembly object files generation. (E.g. relocatable vs. position independent code).

*Linking object files together to create a well-formed binary.

*Detailed description of the Windows PE binary format.

*How Windows loads a binary into memory and links it on the fly before executing it.

*Detailed description of the Unix/Linux/BSD ELF binary format.

Along the way we will discuss the relevance of security at different stages of a binary's life, from how viruses *really* work, to the way which malware "packers" duplicate OS process execution functionality, to the benefit of a security-enhanced OS loader which implements address space layout randomization (ASLR).

Lab work will include:

*Using the new "Binary Scavenger Hunt" tool which creates randomized PE binaries and asks randomized questions about the material you just learned!

*Manipulating compiler options to change the type of assembly which is output

*Manipulating linker options to change the structure of binary formats

*Reading and understanding PE files with PEView

*Using WinDbg to watch the loader resolve imports in an executable

*Using Thread Local Storage (TLS) to obfuscate control flow and serve as a basic anti-debug mechanism

*Creating a simple example virus for PE

*Analyze the changes made to the binary format when a file is packed with UPX

*Using the rootkit technique of Import Address Table (IAT) hooking to subvert the integrity of a program's calls to external libraries, allowing processes to be hidden.

[wirerp]

Round 7:

Single player Mode

Points --> 9500 |
Seconds --> 130 |
|


Round 8:

Single player mode

Points --> 11000 |
Seconds --> 91 |
|


Really good tool to memorize, i hope that the OST2 Life Of Binaries Version will
have some minigames like this 2013 LoB version :)