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This article introduces the knowledge of "how to use Outlook API to execute Shellcode". In the operation of actual cases, many people will encounter this dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

BadOutlook

BadOutlook is a malicious Outlook reader and a simple proof-of-concept PoC that leverages the Outlook API (COM interface) and executes Shellcode on the target system based on the specific triggered topic bar content.

By leveraging the Microsoft.Office.Interop.Outlook namespace, developers can do anything on behalf of the entire Outlook application. This means that new applications can do a lot of things, such as reading email, checking documents or the Recycle Bin, and sending emails.

If the C # Shellcode loader is included in advance, an attacker will be able to use a weaponized application instance to send a malicious email with trigger subject bar content and Base64 encoded Shellcode mail Body content to the target host. The application will then be able to read the malicious email and execute the Shellcode embedded in the malicious email on the target host.

Matters needing attention

We can use this PoC to build a complete C2 framework that relies on email as a means of communication (in this case, implanted malicious code never communicates directly with the Internet)

It is possible to pop up a security warning and notify the user that an application is trying to access Outlook data

When the administrator modifies the registry, you can close it

Tests show that injecting this process into the Outlook client does not cause an alarm

Source code acquisition

Researchers can use the following commands to clone the source code of the PoC project locally:

Git clone https://github.com/S4R1N/BadOutlook.git proof of concept PoC

Outlook application trigger:

Create a Shellcode trigger mail event:

The Outlook client receives email:

The BadOutlook application executes Shellcode:

This is the end of the introduction of "how to use the Outlook API to execute Shellcode". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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