Making your Shellcode Undetectable using .NET

In the world of Windows you can execute shellcode using the VirtualAlloc and VirtualProtect Windows APIs. There are also few more APIs we can use to do the same task but different techniques involved.

VirtualProtect

This is how MSDN explains this:

Changes the protection on a region of committed pages in the virtual address space of the calling process.

[code language=”c”]
BOOL WINAPI VirtualProtect(
_In_ LPVOID lpAddress,
_In_ SIZE_T dwSize,
_In_ DWORD flNewProtect,
_Out_ PDWORD lpflOldProtect
);
[/code]
https://msdn.microsoft.com/en-us/library/windows/desktop/aa366898(v=vs.85).aspx

Basically we can make our shellcode memory region executable and invoke it using this API. We use the PAGE_EXECUTE_READWRITE as the memory protection constant for the flNewProtect parameter to make our page RWX.

Here’s an example using C which I have implemented.
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Bypassing IE and Edge XSS Filters with Double Encoding

IE and Edge both uses a default XSS filter which is not powerful like the XSSAuditor(Webkit/Blink).
This is how the XSS filter is implemented.

https://msdnshared.blob.core.windows.net/media/TNBlogsFS/BlogFileStorage/blogs_technet/swi/WindowsLiveWriter/IE8XSSFilterArchitectureImplementation_7E69/pic1_thumb.png
(source: https://blogs.technet.microsoft.com/srd/2008/08/19/ie-8-xss-filter-architecture-implementation/)
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Satana Malware Analysis

I haven’t done any malware analysis before and this would be my first post related to malware. I’m really interested but still quite a lot of things to learn 🙂 so I thought of starting off somewhere and this is the analysis of the ransomware named “Satana” by me. Obviously I hope you know who is Satan 👿

Samples:

Behavior Analysis

As soon as you run this the main executable will be deleted and a new sample will be created inside the %temp% folder.

View post on imgur.com

The following is the disassembly corresponding to this event.

View post on imgur.com


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Storing a EXE inside MySQL

It’s possible to store a EXE file inside a MySQL database. You can try this out. For demonstration purposes I’m running MySQL in my localhost. I will be creating a simple database and a table big enough to store the exe file. Since we convert the exe to a hex file the content would be larger than the original exe file. I will be using ‘putty.exe’ as the binary.

[code language=”sql”]
CREATE DATABASE testupload;

USE testupload

CREATE TABLE uploads (
id INT(3) NOT NULL AUTO_INCREMENT,
name VARCHAR(1000000) NOT NULL,
PRIMARY KEY (id)
);
[/code]
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Unofficial Way of Commenting in MySQL and MariaDB

In MySQL and MariaDB the official methods of commenting would be

1
2
3
--
#
/* comment */

The ‘#’ is also known as a “fragment identifier” and is typically used to identify a portion of an HTML document that sits within a fully qualified URL.
When passing ‘#’ inside a URL to the back-end database we can use ‘%23’.
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