mirror of
https://github.com/rapid7/metasploit-payloads
synced 2025-05-06 16:09:38 +02:00
cb9ae6acd4
Make the XOR key an array of bytes as a start to normalise the way the XOR happens across the board. Given that we're going to be adding encryption to the packet level and adding more stuff to the packet header, now is the time to fix this up once and for all.
63 lines
1.5 KiB
C
Executable File
63 lines
1.5 KiB
C
Executable File
/*!
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* @file common.c
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* @brief Definitions for various common components used across the Meterpreter suite.
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*/
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#include "common.h"
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#define SLEEP_MAX_SEC (MAXDWORD / 1000)
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/*!
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* @brief Returns a unix timestamp in UTC.
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* @return Integer value representing the UTC Unix timestamp of the current time.
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*/
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int current_unix_timestamp(void) {
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SYSTEMTIME system_time;
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FILETIME file_time;
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ULARGE_INTEGER ularge;
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GetSystemTime(&system_time);
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SystemTimeToFileTime(&system_time, &file_time);
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ularge.LowPart = file_time.dwLowDateTime;
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ularge.HighPart = file_time.dwHighDateTime;
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return (long)((ularge.QuadPart - 116444736000000000) / 10000000L);
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}
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/*!
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* @brief Sleep for the given number of seconds.
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* @param seconds DWORD value representing the number of seconds to sleep.
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* @remark This was implemented so that extended sleep times can be used (beyond the
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* 49 day limit imposed by Sleep()).
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*/
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VOID sleep(DWORD seconds)
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{
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while (seconds > SLEEP_MAX_SEC)
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{
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Sleep(SLEEP_MAX_SEC * 1000);
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seconds -= SLEEP_MAX_SEC;
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}
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Sleep(seconds * 1000);
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}
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VOID xor_bytes(BYTE xorKey[4], LPBYTE buffer, DWORD bufferSize)
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{
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static BOOL initialised = FALSE;
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if (!initialised)
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{
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srand((unsigned int)time(NULL));
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initialised = TRUE;
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}
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for (DWORD i = 0; i < bufferSize; ++i)
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{
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buffer[i] ^= xorKey[i % sizeof(DWORD)];
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}
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}
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VOID rand_xor_key(BYTE buffer[4])
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{
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buffer[0] = (rand() % 254) + 1;
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buffer[1] = (rand() % 254) + 1;
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buffer[2] = (rand() % 254) + 1;
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buffer[3] = (rand() % 254) + 1;
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} |