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You're reading from  Windows APT Warfare

Product typeBook
Published inMar 2023
Reading LevelIntermediate
PublisherPackt
ISBN-139781804618110
Edition1st Edition
Languages
C++
Tools
MiniGW
Concepts
Cybersecurity
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Author (1)
Sheng-Hao Ma
Sheng-Hao Ma
author image
Sheng-Hao Ma

Sheng-Hao Ma is currently working as a threat researcher at TXOne Networks, specializing in Windows reverse engineering analysis for over 10 years. In addition, he is currently a member of CHROOT, an information security community in Taiwan. He has served as a speaker and instructor for various international conferences and organizations such as Black Hat USA, DEFCON, CODE BLUE, HITB, VXCON, HITCON, ROOTCON, Ministry of National Defense, and Ministry of Education.
Read more about Sheng-Hao Ma

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Stub – the main program of an unpacker

So far, we have learned how to develop packer programs. In the previous section, we used an external stub.bin file to generate the master program of the packer stub. In this section, we will describe how to develop the stub in x86.

The following samples are stub.asm source code from the Chapter#8 folder of the GitHub project. To save space, this book only contains highlights of the code. Please refer to the full project for the complete source code.

Figure 8.9 shows the entry point of the hand-written x86 main point of the stub:

Figure 8.9 – The main part of the stub

Figure 8.9 – The main part of the stub

The main task is split into three parts:

  • call decompress_image: This is used to decompress the compressed file-mapping contents of the payload, to fill the text_rwx section to complete the task of restoring the original file-mapping contents, and to act as an application loader to help correct the import table.
  • call recover_ntHdr...
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Windows APT Warfare
Published in: Mar 2023Publisher: PacktISBN-13: 9781804618110
© 2023 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Sheng-Hao Ma

Sheng-Hao Ma is currently working as a threat researcher at TXOne Networks, specializing in Windows reverse engineering analysis for over 10 years. In addition, he is currently a member of CHROOT, an information security community in Taiwan. He has served as a speaker and instructor for various international conferences and organizations such as Black Hat USA, DEFCON, CODE BLUE, HITB, VXCON, HITCON, ROOTCON, Ministry of National Defense, and Ministry of Education.
Read more about Sheng-Hao Ma

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