The Infection Monkey agent takes two steps before attempting to exploit a victim, scanning and fingerprinting. It's possible to customize both steps in the configuration files.
Fingerprinters are modules that collect server information from a specific victim. They inherit from the [`HostFinger`][host-finger] class and are listed under the `finger_classes` configuration option.
1. [`SMBFinger`][smb-finger] - Fingerprints target machines over SMB and extracts the computer name and OS version.
2. [`SSHFinger`][ssh-finger] - Fingerprints target machines over SSH (port 22) and extracts the computer version and SSH banner.
3. [`PingScanner`][ping-scanner] - Fingerprints target machine's TTL to differentiate between Linux and Windows hosts.
4. [`HTTPFinger`][http-finger] - Detects HTTP/HTTPS services, using the ports listed in `HTTP_PORTS` in the configuration, will return the server type and if it supports SSL.
5. [`MySQLFinger`][mysql-finger] - Fingerprints MySQL (port 3306) and will extract MySQL banner info - version, major/minor/build and capabilities.
6. [`ElasticFinger`][elastic-finger] - Fingerprints ElasticSearch (port 9200) will extract the cluster name, node name and node version.
To add a new scanner/fingerprinter, create a new class that inherits from [`HostScanner`][host-scanner] or [`HostFinger`][host-finger] (depending on the interface). The class should be under the network module and imported under [`network/__init__.py`](https://github.com/guardicore/monkey/blob/master/monkey/infection_monkey/network/__init__.py).
To use the new scanner/fingerprinter by default, two files need to be changed - [`infection_monkey/config.py`](https://github.com/guardicore/monkey/blob/master/monkey/infection_monkey/config.py) and [`infection_monkey/example.conf`](https://github.com/guardicore/monkey/blob/master/monkey/infection_monkey/example.conf) to add references to the new class.
At this point, the Infection Monkey knows how to use the new scanner/fingerprinter but to make it easy to use, the UI needs to be updated. The relevant UI file is [`monkey_island/cc/services/config.py`](https://github.com/guardicore/monkey/blob/master/monkey/monkey_island/cc/services/config.py).
