LyScript怎么實現Hook隱藏調試器

本篇內容主要講解“LyScript怎么實現Hook隱藏調試器”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“LyScript怎么實現Hook隱藏調試器”吧!

我們以此實現Patches如下函數:

• IsDebuggerPresent

• ZwQueryInformationProcess

• CheckRemoteDebuggerPresent

• PEB.IsDebugged

• PEB.ProcessHeap.Flag

• PEB.NtGlobalFlag

• PEB.Ldr 0xFEEEFEEE filling

• GetTickCount

• ZwQuerySystemInformation

• FindWindowA

• FindWindowW

• FindWindowExA

• FindWindowExW

• EnumWindows

首先第一步我們需要自己封裝實現一個反匯編轉機器碼的函數，其作用是當用戶傳入匯編列表時，自動將其轉為機器碼并輸出為列表格式。

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ShellCode = GetOpCode(dbg, ["DB 0x64","mov eax,dword ptr ds:[18]","sub eax,eax","ret"])

    print(ShellCode)

    dbg.close()

輸出效果如下：

Patch_PEB

PEB結構存在許多反調試變量，首先我們需要先將這些變量填充為空。

# ----------------------------------------------
# By: LyShark
# Email: me@lyshark.com
# Project: https://github.com/lyshark/LyScript
# ----------------------------------------------

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

def Patch_PEB(dbg):
    PEB = dbg.get_peb_address(dbg.get_process_id())
    if PEB == 0:
        return 0

    # 寫出0 Patching PEB.IsDebugged
    dbg.write_memory_byte(PEB + 0x2,GetOpCode(dbg,["db 0"])[0])
    print("補丁地址: {}".format(hex(PEB+0x2)))

    # 寫出0 Patching PEB.ProcessHeap.Flag
    temp = dbg.read_memory_dword(PEB + 0x18)
    temp += 0x10
    dbg.write_memory_dword(temp, GetOpCode(dbg,["db 0"])[0])
    print(("補丁地址: {}".format(hex(temp))))

    # 寫出0 atching PEB.NtGlobalFlag
    dbg.write_memory_dword(PEB+0x68, 0)
    print(("補丁地址: {}".format(hex(PEB+0x68))))

    # 循環替換 Patch PEB_LDR_DATA 0xFEEEFEEE fill bytes about 3000 of them
    addr = dbg.read_memory_dword(PEB + 0x0c)

    while addr != 0:
        addr += 1

        try:
            b = dbg.read_memory_dword(addr)
            c = dbg.read_memory_dword(addr + 4)

            # 僅修補填充運行
            print(b)
            if (b == 0xFEEEFEEE) and (c == 0xFEEEFEEE):
                dbg.write_memory_dword(addr,0)
                dbg.write_memory_dword(addr + 4, 0)
                print("patch")
        except Exception:
            break

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    Patch_PEB(dbg)
    
    dbg.close()

Patch_IsDebuggerPresent

該函數用于檢測自身是否處于調試狀態，其C系列代碼如下所示，繞過此種方式很簡單，只需要在函數頭部寫出ret指令即可。

#include <Windows.h>
#include <stdio.h>

int _tmain(int argc, _TCHAR* argv[])
{
	BOOL ref = IsDebuggerPresent();
	printf("是否被調試: %d \n", ref);

	getchar();
	return 0;
}

注意：此Api檢查PEB中的值，因此如果修補PEB，則無需修補Api，這段繞過代碼如下。

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

def Patch_IsDebuggerPresent(dbg):
    # 得到模塊句柄
    ispresent = dbg.get_module_from_function("kernel32.dll","IsDebuggerPresent")
    print(hex(ispresent))

    if(ispresent <= 0):
        print("無法得到模塊基地址,請以管理員方式運行調試器.")
        return 0

    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg, ["DB 0x64", "mov eax,dword ptr ds:[18]", "sub eax,eax", "ret"])
    print(ShellCode)

    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(ispresent + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0
    return flag

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ref = Patch_IsDebuggerPresent(dbg)
    print("補丁狀態: {}".format(ref))

    dbg.close()

當程序運行后會向IsDebuggerPresent函數寫出返回，從而實現繞過調試的目的。

Patch_CheckRemoteDebuggerPresent

此Api調用ZwQueryInformationProcess因此通常不需要對兩者進行修補。

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

def Patch_CheckRemoteDebuggerPresent(dbg):
    # 得到模塊句柄
    ispresent = dbg.get_module_from_function("kernel32.dll","CheckRemoteDebuggerPresent")
    print(hex(ispresent))

    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg,
                          [
                              "mov edi,edi",
                              "push ebp",
                              "mov ebp,esp",
                              "mov eax,[ebp+0xc]",
                              "push 0",
                              "pop dword ptr ds:[eax]",
                              "xor eax,eax",
                              "pop ebp",
                              "ret 8"
                          ]
                          )

    print(ShellCode)

    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(ispresent + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0
    return flag

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ref = Patch_CheckRemoteDebuggerPresent(dbg)
    print("寫出狀態: {}".format(ref))

    dbg.close()

寫出效果如下：

Patch_GetTickCount

GetTickCount返回（retrieve）從操作系統啟動所經過（elapsed）的毫秒數，常用于定時計數，繞過方式只需初始化即可。

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

def Patch_GetTickCount(dbg):
    # 得到模塊句柄
    ispresent = dbg.get_module_from_function("kernel32.dll","GetTickCount")
    print(hex(ispresent))

    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg,
                          [
                              "mov edx,0x7ffe0000",
                              "sub eax,eax",
                              "add eax,0xB0B1560D",
                              "ret"
                          ]
                          )

    print(ShellCode)

    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(ispresent + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0
    return flag

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ref = Patch_GetTickCount(dbg)
    print("寫出狀態: {}".format(ref))

    dbg.close()

寫出效果如下：

Patch_ZwQueryInformationProcess

此函數打補丁需要跳轉兩次，原因是因為函數開頭部分無法填充更多指令，需要我們自己來申請空間，并實現跳轉。

# ----------------------------------------------
# By: LyShark
# Email: me@lyshark.com
# Project: https://github.com/lyshark/LyScript
# ----------------------------------------------

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

# 獲取指定位置前index條指令的長度
def GetOpCodeSize(dbg,address,index):
    ref_size = 0

    dasm = dbg.get_disasm_code(address,index)
    for index in dasm:
        count = dbg.assemble_code_size(index.get("opcode"))
        ref_size += count
    return ref_size

def Patch_ZwQueryInformationProcess(dbg):
    # 得到模塊句柄
    ispresent = dbg.get_module_from_function("ntdll.dll","ZwQueryInformationProcess")
    print(hex(ispresent))

    create_address = dbg.create_alloc(1024)
    print("分配空間: {}".format(hex(create_address)))


    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg,
                          [
                              "cmp dword [esp + 8],7",
                              "DB 0x74",
                              "DB 0x06",
                              f"push {hex(ispresent)}",
                              "ret",
                              "mov eax,dword [esp +0x0c]",
                              "push 0",
                              "pop dword [eax]",
                              "xor eax,eax",
                              "ret 14"
                          ]
                          )

    print(ShellCode)

    # 把shellcode寫出到自己分配的堆中
    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(create_address + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0

    # 填充跳轉位置
    jmp_shellcode = GetOpCode(dbg,
                              [
                                  f"push {hex(create_address)}",
                                  "ret"
                              ]
                              )
    for index in range(0,len(jmp_shellcode)):
        flag = dbg.write_memory_byte(ispresent + index,jmp_shellcode[index])
        if flag:
            flag = 1
        else:
            flag = 0

    return flag

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ref = Patch_ZwQueryInformationProcess(dbg)

    print("補丁狀態: {}".format(ref))

    dbg.close()

這段代碼運行后，首先會申請內存，然后將特定的一段機器碼寫出到此內存中。

內存寫出以后，再將函數頭部替換為跳轉，這樣一來當函數被調用，也就自動轉向了。

Patch_FindWindow

FindWindow函數功能是取窗體句柄，有AW與Ex系列，使用同上方法替代即可。

# ----------------------------------------------
# By: LyShark
# Email: me@lyshark.com
# Project: https://github.com/lyshark/LyScript
# ----------------------------------------------

from LyScript32 import MyDebug
import ctypes

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

def Patch_FindWindow(dbg):
    # 得到模塊句柄
    FindWindowA = dbg.get_module_from_function("user32.dll","FindWindowA")
    FindWindowW = dbg.get_module_from_function("user32.dll","FindWindowW")
    FindWindowExA = dbg.get_module_from_function("user32.dll","FindWindowExA")
    FindWindowExW = dbg.get_module_from_function("user32.dll","FindWindowExW")
    print("A = {} w = {} exA = {} exW = {}".format(hex(FindWindowA),hex(FindWindowW),hex(FindWindowExA),hex(FindWindowExW)))

    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg,
                          [
                              "xor eax,eax",
                              "ret 0x8",
                          ]
                          )

    ShellCodeEx = GetOpCode(dbg,
                            [
                                "xor eax,eax",
                                "ret 0x10",
                            ]
                            )
    # 寫出
    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(FindWindowA + index,ShellCode[index])
        flag = dbg.write_memory_byte(FindWindowW + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0

    for index in range(0,len(ShellCodeEx)):
        flag = dbg.write_memory_byte(FindWindowExA + index,ShellCodeEx[index])
        flag = dbg.write_memory_byte(FindWindowExW + index,ShellCodeEx[index])
        if flag:
            flag = 1
        else:
            flag = 0

    return flag

if __name__ == "__main__":
    dbg = MyDebug()

    connect = dbg.connect()

    ref = Patch_FindWindow(dbg)
    print("補丁狀態: {}".format(ref))

    dbg.close()

補丁應用會分別替換四個函數。

Patch_EnumWindows

枚舉窗體的補丁與上方代碼一致，此處就不再分析了。

如下案例，實現了在枚舉窗體過程中實現彈窗，并不影響窗體的枚舉。

from LyScript32 import MyDebug

# 傳入匯編代碼,得到對應機器碼
def get_opcode_from_assemble(dbg_ptr,asm):
    byte_code = bytearray()

    addr = dbg_ptr.create_alloc(1024)
    if addr != 0:
        asm_size = dbg_ptr.assemble_code_size(asm)
        # print("匯編代碼占用字節: {}".format(asm_size))

        write = dbg_ptr.assemble_write_memory(addr,asm)
        if write == True:
            for index in range(0,asm_size):
                read = dbg_ptr.read_memory_byte(addr + index)
                # print("{:02x} ".format(read),end="")
                byte_code.append(read)
        dbg_ptr.delete_alloc(addr)
        return byte_code
    else:
        return bytearray(0)

# 傳入匯編機器碼得到機器碼列表
def GetOpCode(dbg, Code):
    ShellCode = []

    for index in Code:
        ref = get_opcode_from_assemble(dbg,index)
        for opcode in ref:
            ShellCode.append(opcode)

    return ShellCode

# 獲取指定位置前index條指令的長度
def GetOpCodeSize(dbg,address,index):
    ref_size = 0

    dasm = dbg.get_disasm_code(address,index)
    for index in dasm:
        count = dbg.assemble_code_size(index.get("opcode"))
        ref_size += count
    return ref_size

def Patch_EnumWindows(dbg):
    # 得到模塊句柄
    address = dbg.get_module_from_function("user32.dll","EnumWindows")
    print(hex(address))

    msg_box = dbg.get_module_from_function("user32.dll","MessageBoxA")
    print(hex(msg_box))

    create_address = dbg.create_alloc(1024)
    print("分配空間: {}".format(hex(create_address)))

    # 找call地址，找到后取出他的內存地址
    dasm_list = dbg.get_disasm_code(address,20)
    call_addr = 0
    call_next_addr = 0
    for index in range(0,len(dasm_list)):

        # 如果找到了call，取出call地址以及下一條地址
        if dasm_list[index].get("opcode").split(" ")[0] == "call":
            call_addr = dasm_list[index].get("addr")
            call_next_addr = dasm_list[index+1].get("addr")
            print("call = {} call_next = {}".format(hex(call_addr),hex(call_next_addr)))

    # 將反調試語句轉為機器碼
    ShellCode = GetOpCode(dbg,
                          [
                              "push 0",
                              "push 0",
                              "push 0",
                              "push 0",
                              f"call {hex(msg_box)}",
                              "mov eax,1",
                              "pop ebp",
                              "ret 10",

                              f"call {hex(call_addr)}",
                              "pop ebp",
                              "ret 8"
                          ]
                          )

    print(ShellCode)

    # 把shellcode寫出到自己分配的堆中
    flag = 0
    for index in range(0,len(ShellCode)):
        flag = dbg.write_memory_byte(create_address + index,ShellCode[index])
        if flag:
            flag = 1
        else:
            flag = 0


    # 填充跳轉位置
    jmp_shellcode = GetOpCode(dbg,
                              [
                                  f"push {hex(create_address)}",
                                  "ret"
                              ]
                              )
    for index in range(0,len(jmp_shellcode)):
        flag = dbg.write_memory_byte(call_addr + index,jmp_shellcode[index])
        if flag:
            flag = 1
        else:
            flag = 0

    return flag

if __name__ == "__main__":
    dbg = MyDebug()
    connect = dbg.connect()

    ref = Patch_EnumWindows(dbg)

    dbg.close()

輸出效果如下：

到此，相信大家對“LyScript怎么實現Hook隱藏調試器”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！