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entropy.py
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entropy.py
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import os
#import sys
import time
import threading
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
import multiprocessing
import socket
timestamp_last_encryption = 0
def calc_queue_average(global_queue):
s = 0
for item in global_queue: # wrong statement, doesn't work!!
s += item
print("[+] QUEUE TOTAL: ", s)
return 1 if s > 0 else -1
def delta_access_time_last_encryption(access_time, last_enc_time):
if last_enc_time != 0:
if access_time - last_enc_time >= 10:
return False # User process
else:
return True # Malicious process
else:
return False # User process
def server_connection(global_queue, queue_total, timestamp_last_encryption):
host = socket.gethostname()
port = 5000
server_socket = socket.socket()
server_socket.bind((host, port))
server_socket.listen(1)
conn, address = server_socket.accept()
while True:
data = conn.recv(1024).decode()
req, timestamp_access = data.split()
print(f"[+] TIMESTAMP_ACCESS: {timestamp_access}")
print(f"[+] TIMESTAMP_LAST_ENCRYPTION: {timestamp_last_encryption.value}")
if not data:
break
if req == "req":
if queue_total.value > 0 and delta_access_time_last_encryption(int(timestamp_access), timestamp_last_encryption.value):
conn.send("1".encode())
else:
conn.send("-1".encode())
else:
conn.send("5".encode())
conn.close()
def insert_into_queue(val):
x = global_queue.get(block=False)
queue_total.value -= x
global_queue.put(val, block=False)
queue_total.value += val
def debounce(interval):
def decorator(f):
def wrapper(*args, **kwargs):
wrapper.last_invocation_time = time.time()
if not hasattr(wrapper, 'timer'):
wrapper.timer = None
if wrapper.timer is not None:
wrapper.timer.cancel()
if time.time() - wrapper.last_invocation_time > interval:
f(*args, **kwargs)
else:
wrapper.timer = threading.Timer(interval, f, args=args, kwargs=kwargs)
wrapper.timer.start()
return wrapper
return decorator
class MyHandler(FileSystemEventHandler):
def __init__(self):
self.created_files = set()
#def on_any_event(self, event):
#print(event.event_type, event.src_path)
def on_created(self, event):
if event.src_path[-10:] != "mypipe.txt" and not event.src_path.startswith("./."):
if not event.is_directory:
#print(f"TEST: {event.src_path}")
#if os.stat(event.src_path).st_size == 0:
# print("ZERO SIZE")
if os.path.exists(event.src_path):
#print(f"TEST1: {event.is_directory}")
chi_sq = chisquare(event.src_path)
#database[event.src_path] = chi_sq
#print(chi_sq)
if chi_sq != 0:
self.created_files.add(event.src_path)
if chi_sq > 310.46: # Non-encrypted
insert_into_queue(-1)
print(f"[+] CREATED QUEUE NE : {global_queue}")
else:
if chi_sq != 0:
timestamp_last_encryption.value = int(time.time())
insert_into_queue(1)
print(f"[+] CREATED QUEUE E : {global_queue}")
else:
print("[+] CHI_SQ CREATED = 0")
#print(database)
print("[+] CREATED", event.src_path)
#@debounce(1)
def on_any_event(self, event):
if event.src_path.startswith("./."):
# Handle file system event here
return
if event.event_type == "created":
return
if event.event_type == "closed" and not event.is_directory:
if event.src_path[-10:] != "mypipe.txt" and not event.src_path.startswith("./."):
if not event.is_directory:
#time.sleep(1)
chi_sq = chisquare(event.src_path)
#database[event.src_path] = chi_sq
#print(chi_sq)
# check if the file was also created
if event.src_path in self.created_files:
# remove the file from the list of created files
self.created_files.remove(event.src_path)
return
if chi_sq > 310.46: # Non-encrypted
insert_into_queue(-1)
print(f"[+] MODIFIED QUEUE NE : {global_queue}")
else:
if chi_sq != 0:
timestamp_last_encryption.value = int(time.time())
insert_into_queue(1)
print(f"[+] MODIFIED QUEUE E : {global_queue}")
else:
print("[+] CHI_SQ MODIFIED = 0")
#print(database)
print("[+] MODIFIED", event.src_path)
else:
print("[+] MODIFIED DIRECTORY", event.src_path)
def on_deleted(self, event):
if event.src_path[-10:] != "mypipe.txt" and not event.src_path.startswith("./."):
#try:
# del database[event.src_path]
#except KeyError as e:
# print(e)
#print(database)
print("[+] DELETED", event.src_path)
#@debounce(1)
#def on_modified(self, event):
# if event.src_path[-11:] != "/mypipe.txt" and not event.src_path.startswith("./."):
# if not event.is_directory:
#time.sleep(1)
# chi_sq = chisquare(event.src_path)
# database[event.src_path] = chi_sq
#print(chi_sq)
# if chi_sq > 310.46: # Non-encrypted
# insert_into_queue(-1)
# print(f"[+] MODIFIED QUEUE NE : {global_queue}")
# else:
# if chi_sq != 0:
# insert_into_queue(1)
# print(f"[+] MODIFIED QUEUE E : {global_queue}")
# else:
# print("[+] CHI_SQ MODIFIED = 0")
#print(database)
# print("[+] MODIFIED", event.src_path)
# else:
# print("[+] MODIFIED DIRECTORY", event.src_path)
#def on_moved(self, event):
#print("on_moved", event.src_path)
def chisquare(fname):
#print(fname)
try:
with open(fname, "rb") as file:
count = dict()
c = 0
for line in file:
for ch in line:
c += 1
if ch in count:
count[ch] += 1
else:
count[ch] = 1
except FileNotFoundError as e:
c = 0
count = {}
print(e)
Ei = c / 256
X = 0
k = 0
for num in count.values():
k += 1
X += (num - Ei) ** 2
X += (256 - k) * (Ei ** 2)
return X / Ei if Ei != 0 else 0
def calc_chisquare():
db = dict()
for root, dirs, files in os.walk(".", topdown=True):
files = [f for f in files if not f[0] == '.']
dirs[:] = [d for d in dirs if not d[0] == '.']
for name in files:
if name[-10:] == "mypipe.txt":
#print("EXXXXX")
continue
fname = os.path.join(root, name)
print("Processing: ", fname)
_chiquare = chisquare(fname)
db[fname] = _chiquare
return db
if __name__ == "__main__":
pid = os.getpid()
with open("pid.txt", "w") as file1:
file1.write(str(pid))
#print(read_content)
# src_path = sys.argv[1]
# database = calc_chisquare()
#database = {}
k = 20
global_queue = multiprocessing.Queue(maxsize=20)
#deque([0] * k, maxlen=k)
for i in range(20):
global_queue.put(0)
queue_total = multiprocessing.Value('i')
queue_total.value = 0
timestamp_last_encryption = multiprocessing.Value('i')
timestamp_last_encryption.value = 0
event_handler = MyHandler()
# Exclude hidden folders using the ignore_patterns parameter
# ignore_patterns = ["*/.*"]
observer = Observer()
observer.schedule(event_handler, path=".", recursive=True)
print("Monitoring started.")
observer.start()
p = multiprocessing.Process(target=server_connection, args=(global_queue, queue_total, timestamp_last_encryption,))
p.start()
try:
while(True):
time.sleep(1)
except KeyboardInterrupt:
observer.stop()
observer.join()