/*
 *
 * Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
 * All rights reserved.
 *
 * This file is part of libprotoident.
 *
 * This code has been developed by the University of Waikato WAND
 * research group. For further information please see http://www.wand.net.nz/
 *
 * libprotoident is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * libprotoident is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#include <string.h>

#include "libprotoident.h"
#include "proto_manager.h"
#include "proto_common.h"

/* https://www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/bkdr_glupteba.yvg */

static inline bool match_glup_hello(uint32_t payload, uint32_t len) {

        if (MATCH(payload, 'H', 'E', 'L', 'L'))
                return true;
        return false;
}

static inline bool match_glup_id(uint32_t payload, uint32_t len) {

        /* ID changes from infected host to infected host, but I'm
         * going to assume the ID has a similar length.
         */

        if (len >= 18 && len <= 25) {
                /* Always begins with @ */
                if (MATCH(payload, '@', ANY, ANY, ANY))
                        return true;
        }
        return false;

}

static inline bool match_glupteba(lpi_data_t *data, lpi_module_t *mod UNUSED) {

        if (match_glup_hello(data->payload[0], data->payload_len[0])) {
                if (match_glup_id(data->payload[1], data->payload_len[1])) {
                        return true;
                }
                if (match_glup_hello(data->payload[1], data->payload_len[1])) {
                        return true;
                }
        }
        if (match_glup_hello(data->payload[1], data->payload_len[1])) {
                if (match_glup_id(data->payload[0], data->payload_len[0])) {
                        return true;
                }
                if (match_glup_hello(data->payload[0], data->payload_len[0])) {
                        return true;
                }
        }

	return false;
}

static lpi_module_t lpi_glupteba = {
	LPI_PROTO_GLUPTEBA,
	LPI_CATEGORY_MALWARE,
	"GluptebaBackdoor",
	50,
	match_glupteba
};

void register_glupteba(LPIModuleMap *mod_map) {
	register_protocol(&lpi_glupteba, mod_map);
}