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executing MessageBoxA inside remote process

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Dark Byte
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Reputation: 458

Joined: 09 May 2003
Posts: 25281
Location: The netherlands

Posted: Sun Jun 04, 2017 5:27 pm Post subject: executing MessageBoxA inside remote process

Code:

if messageBoxACaller==nil then
if autoAssemble([[
alloc(messageBoxACaller,128)
registersymbol(messageBoxACaller)
messageBoxACaller:
sub rsp,28
mov r9,[rcx+18] //button
mov r8,[rcx+10] //caption
mov rdx,[rcx+8] //text
mov rcx,[rcx] //hwnd
call MessageBoxA

add rsp,28
ret

]]) then
messageBoxACaller=getAddressSafe('messageBoxACaller')
end
end

if messageBoxACaller==nil then
error('autoAssemble failed')
end

function MessageBox(hwnd, message, caption, button)
local mymem=allocateMemory(512)

local captionaddress
writeString(mymem, message)
writeBytes(mymem+#message,0) --0 terminator
captionaddress=mymem+#message+1

writeString(captionaddress,caption)
writeBytes(captionaddress+#caption,0)

local params=captionaddress+#caption+1
writeQword(params,hwnd) --hwnd
writeQword(params+8,mymem) --text
writeQword(params+16,captionaddress) --caption
writeQword(params+24,button) --button (0=ok)

executeCode(messageBoxACaller,params)

deAlloc(mymem)
end

return MessageBox(0, 'BLA','XXX',0)

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