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"Reverse chapter" Analysis a simple shellcode--from TEB to function address acquisition

. basedllname.buffer00417013 8B mov edx,dword ptr [edx]//edx = _ldr_data_table_entry. ininitializationorderlinks.flink00417015 7E 0C cmp byte ptr [esi+0ch],33h//search "kernel32.d ll "00417019 F2 jne shellcode+0dh (41700Dh) 0041701B C7 mov Edi,eax//edi = kernel32.dll.DllBase (image_dos_header) 0041701D 3C add edi, DWORD ptr [eax+3ch]//

Linux under the at& Getting started with the T syntax (GNU as Assembly Syntax)

the operation, such as Movl $foo,%eax equivalent to the Intel mov eax, Word ptr fooLong jump and call format is different, at/T is ljmp $section, $offset, and Intel is the JMP Section:offsetThe main difference is these, the other details are many, the following gives a specific example to illustrate#cpuid. S Sample Program. Section. DataOutput. ASCII "The processor Vendor ID is ' xxxxxxxxxxxx ' \ n". section. Text. globl _start_start:MOVL,%eaxCpuidMOVL $output,%ediMovl%ebx, (%

Shellcode avoiding stack protections sample --- vallez/29A

------------------------------------------------------------------------------------------- . 78462fdf: AB stosd. 78462fe0: 5f pop EDI. 78462fe1: c20400 retn 00004. Bytes ------------------------------------------------------------------------------------------- . 784635ec: 8bc6 mov eax, ESI. 784635ee: 5f pop EDI. 784635ef: 5E pop ESI. 784635f0: C3 retn Bytes -----------------------------------------------

Delphi Image Processing-color phase/saturation adjustment (continued)

: integer; var table: tgraytable); ASM push ebx cmp eax,-255 jge @ 1 mov eax,-255 JMP @ 2 @ 1: CMP eax, 255 jle @ 2 mov eax, 255 @ 2: Push eax mov EBX, 255 fild dword ptr [esp] fwait mov [esp], EBX fidiv dword ptr [esp] // bright/255 fwait XOR ECx, ECx test eax, eax JG @ loop xor ebx, EBX // mask = bright> 0? 255: 0 @ loop: mov [esp], ECx XOR [esp], EBX fild dword ptr [esp] fmul ST (0), ST (1) fistp dword ptr [esp] fwait mov eax, [esp] add eax, ECx mov [edX], Al // table [I] = (I ^ mask) * brigh

[BizTalk advanced development skills] using ing an outgoing batch

To enable batch packaging of EDI X12 files in BizTalk, follow these steps: 1) Configure party's X12 Properties> party as interchange receiver> interchange batch creation settings 1.1 configure filter criteria 1.2 set release criteria"External release trigger" 1.3 Note: If a sendport needs to subscribe to the batch transaction set of the party, you must set the following subscription conditions:

Discussion on protection technology of virtual machine

parameters, we need to translate the push command. Depending on the object of the push, different implementations are required:VPUSHREG32:; register into the stack. ESI points to the memory address of the bytecodeMov Eax,dword Ptr[esi]; Get the offset address of the register in the VMCONTEXT structure from the pseudo code (byte code)ADD esi,4; The VMCONTEXT structure preserves the values of each register. The structure is saved inside the stack.Mov eax,dowrd ptr [

Amazon Kindle (Windows) cannot be started again after a malformed azw is opened

): Access violation - code c0000005 (!!! second chance !!!)*** ERROR: Symbol file could not be found. Defaulted to export symbols for F:\Program Files (x86)\Amazon\Kindle\Kindle.exe - eax=000000dd ebx=000004e4 ecx=00000000 edx=0022ed44 esi=0022ed68 edi=000000ddeip=0197383f esp=0022ed14 ebp=05920448 iopl=0 nv up ei pl nz na po nccs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00210202Kindle!std::_Init_locks::operator=+0x13

Use the program to modify PE so that it displays a message box

Modifyfile,pmapaddr; Modify memory block contentsInvoke unmapviewoffile,pmapaddr; unlock file mappings. endifInvoke Closehandle,hmap; Close memory-mapped file. endifInvoke CloseHandle, hfile; Close file. endifRetWinMain ENDP; Get the file name to process; Return: If eax=null indicates that no file name is provided for processing; otherwise eax point to the filename addressGetFileName ProcInvoke Getfilenamefromcommandline,addr FileName. If Eax==nullCall Getfilenamefromdialog. endifRetGetFileName

We also discuss how to insert a dynamic GIF into RichEdit.

call drawimage. Siid_framedimensiontime textequ Framedimensiontime guid siid_framedimensiontime Drawimage proc uses esi edi ebx hdc, X, YLocal dwticksLocal hgraphicsLocal RT: rectLocal hscrdc, htempdc, hbitmap. If m_ppropertyitem; Calculate the currently displayed frame through the Frame delay data and the elapsed timeInvoke timegettime; timegettime precision is 1 msSub eax, m_dwframe0tickXOR edX, EDXMoV ECx, 10Div ECxMoV dwticks, eaxMoV ESI, m_pprop

High Availability cluster configuration in RedHatAS3

Machine Software: Vmware GSX Server 3.1 Install the basic systems of Vmware GSX Server 3.1 and Redhat AS3.0 1. Install Vmware GSX Server3.1 I believe that all of you have installed workstation, and the process is almost the same. There is not much nonsense here. One thing to note is that VMware GSX Server2.5 cannot op

Use vmwarevm to migrate existing servers and networks (8)

Windows 2000 Server to the ghost console, and save the file name as w2kser. gho.4-3 create a Windows 200 Server Virtual Machine in VMware gsx ServerRefer to the section "13.4.3 how to create a new Virtual Machine" to create a virtual machine for Windows 3.2 server on a VM of VMware gsx Server 2000. Note the following when creating a VM:① Use custom to create a custom image.② Select a guest operating system

How to Write a simple virus program

] SHL ECx, 3 XOR edX, EDX Lea EDI, [ECx + ESI + 78 H] Movzx eax, word PTR [ESI + 6 H] Imul eax, eax, 28 h Add EDI, eax; locate to the end of the last section ; Start filling in the new section struct This code is easy to locate at the end of the last section after the section table. You may use sizeofheader plus numberofsection * section size 28 h, but I still compare the method I am using. The reason is th

How to Write a simple virus program

infection was like this, but one day, I found that the Notepad program that was infected with the virus could not be used. I always prompted "invalid Win32 program" that I wrote the virus again, I changed the code but it still didn't work. I am very disappointed to read articles online. I accidentally saw an article by Lao Luo. In one of the articles, he wrote a special comment. I am grateful to someone who helped him with the technology and pointed out that 0 should be cleared at XX. It seems

Virus program Source code example Anatomy-CIH virus [4]

push EAX; block table size push edx; edx is the offset of the Virus code block table push esi; buffer address    Combined virus code block and Virus code block table must be less than or equal to the amount of space not used Inc ECX push ecx; Save numberofsections+1    SHL ecx, 03h; multiply 8 push ecx; reserved virus block table space    Add ecx, eax add ecx, edx; offset of the body of the ecx+ file    Sub ecx, (sizeofheaders-@9) [esi] Not ECX Inc ECX; ecx for file header size-offset of

How to crack Shell

Stack006af03c | ff95 4d0f0000 call dword ptr ss: [EBP + F4D]; kernel32.getmodulehandlea006af042 | 8985 26040000 mov dword ptr ss: [EBP + 426], eax; the handle of kernel32.dll is stored in EBP + 426006af048 8bf8 mov EDI, eax; kernel32.77e40000006af04a 8d5d 5E Lea EBX, dword ptr ss: [EBP + 5E]; "virtualalloc"006af04d 53 push EBX006af04e 50 push eax; kernel32.dll handle006af04f ff95 490f0000 call dword ptr ss: [EBP + f49]; getprocaddress006af055 8985 4d

Functions and assembly

operation adds ESP to 8, indicating that the stack growth direction is from high address to low address. 00c93a03 mov dword ptr [Sum], eax # function return value stored in eax in the sum variable # function call field int pushparametersorderapp (INT param1, int param2) {00e41f80 push EBP # Save the previous EBP pointer, esp + = 400e41f81 mov EBP, esp # assign the new ESP to EBP and direct it to 00e41f83 sub ESP at the bottom of the current function stack, 0d8h # reserve 216 (0d8) bytes for the

Memcpy implementation in Linux x86 Kernel

Static _ always_inline void * _ memcpy (void * To, const void * From, size_t N) {int D0, D1, D2; ASM volatile ("rep; movsl \ n \ t "" movl % 4, % ECx \ n \ t "" andl $3, % ECx \ n \ t "" JZ 1f \ n \ t "" rep; movsb \ n \ t "" 1: ":" = C "(D0 ), "= D" (D1), "= S" (D2): "0" (N/4), "G" (N ), "1" (long) to), "2" (long) from): "Memory"); return to;}/** this looks uugly, but the compiler can optimize it totally, * as the Count is const Ant. */static _ always_inline void * _ constant_memcpy (void *

Linux-0.11 Kernel Memory Management get_free_page () function analysis

/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a

Linux-0.11 Kernel Memory Management get_free_page () function analysis

/**author:davidlin*date:2014-11-11pm*email: [email protected] or [email protected]*world:the City of SZ, in China*ver:000.000.001*history:editor time do1) Linpeng 2014-11-11 created this file!2)*/Linux-0.11 Memory Management module is more difficult to understand in the source code part, now the author's personal understanding publishedFirst hair Linux-0.11 kernel memory management get_free_page () function analysisHave time to write other functions or files:)/** Get Physical Address of first (a

C ++ (opening part) 01 from the perspective of Assembly

carried out in assembly, let's talk about some personal opinions. Next, we will conduct some small tests and explain them in assembly language. You can do it together. (1) Char name [] and char * Name [CPP] View plaincopy 1: 2:VoidProcess () 3 :{ 00401020 push EBP 00401021 mov EBP, ESP 00401023 sub ESP, 4ch 00401026 push EBX 00401027 push ESI 00401028 push EDI 00401029 Lea EDI

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