# Heap加密

## 简介

最近堆(Heap)加密给BeaconEye整挺火,刚好自己也在写C2,就简单记录下。

## 流程

1. 遍历进程拥有的堆。
2. 编译堆中已分配的块。
3. 异或已分配块中的数据。

## 过程

首先用GetProcessHeaps获取进程拥有的所有堆句柄。

```
DWORD GetProcessHeaps(
  DWORD   NumberOfHeaps,
  PHANDLE ProcessHeaps
);
```

然后用HeapWalk枚举所有已分配的堆内存块。(这个函数设计的挺好的终于不用啥First Next了 略略略)

（heapEntry.wFlags & PROCESS\_HEAP\_ENTRY\_BUSY)

```
BOOL HeapWalk(
  HANDLE               hHeap,
  LPPROCESS_HEAP_ENTRY lpEntry
);
```

![](/files/-Ml5XkP8Sxreq2Q1BWP6)

![](/files/-Ml5XoLeQNTC1azDTKTS)

## 代码

```
#include <windows.h>
#include <stdio.h>


VOID Xor(char* buffer, size_t buffer_size) {
	char key[9] = { 1,2,3,4,5,6,8,0 };

	for (size_t i = 0; i < buffer_size; i++)
	{
		buffer[i] ^= key[i % sizeof(key)-1];
	}
}

VOID FuckHeap() {
	PROCESS_HEAP_ENTRY heapEntry = { 0 };
	HANDLE hHeap = GetProcessHeap();
	while (HeapWalk(hHeap, &heapEntry))
	{
		if (heapEntry.wFlags & PROCESS_HEAP_ENTRY_BUSY)
		{
			Xor((char*)heapEntry.lpData, heapEntry.cbData);
		}
	}
}

int main()
{
	
	LPVOID WorkPath = malloc(MAX_PATH);
	GetCurrentDirectoryA(MAX_PATH, (LPSTR)WorkPath);
	printf("%s\n", (char*)WorkPath);
	FuckHeap();

	//printf("%s\n", (char*)WorkPath);
	FuckHeap();
	printf("%s\n", (char*)WorkPath);

}
```

## Links

<https://www.arashparsa.com/hook-heaps-and-live-free/>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://idiotc4t.com/weapon-design/c2-manuscript/heap-jia-mi.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.