03 – Identifying Use of Auto-IT Scripts, More Shellcode and Some Encryption

Summary: The video discusses the process of analyzing the file named name.exe, focusing on its characteristics as a PE file and its potential connections to malicious activities through the AutoIt scripting language. The presenter demonstrates how to extract and analyze the AutoIt script and other resources to better understand the behavior of the file and any associated shellcode.

Keypoints:

• The analysis begins with examining name.exe using detection tools to confirm it is a PE file.
• Found evidence of UPX packing and the inclusion of AutoIt scripting language in the PE file.
• AutoIt scripts may act as dropper files and can be extracted for further analysis.
• Using AutoIt Ripper, the AutoIt script and its resources were successfully extracted.
• Initial assessment of the script indicates nonsensical variable names and potential complicating factors in the analysis.
• Despite typically unpacking files, the necessary AutoIt components were not compressed within the UPX layer.
• A secondary file, identified as lards, contains recognizable patterns indicating possible shellcode.
• Hexadecimal values within the lards file were modified to identify potential entry points for shellcode execution.
• The presenter used CyberChef to decode the shellcode and produced a PE file for further examination.
• Results from the FLOSS tool provided decoded strings from the analysis, indicating process creation and injection activities.
• An XOR decryption method was applied to recover the final valid PE file, leading to additional analysis opportunities in the subsequent video.