Filter DGA

DGA (Domain Generation Algorithm)

Description

The DGA filter aims to detect Domain Generation Algorithms used mainly for command and control

Filter Code

0x64676164

Dependencies

• faup, 1.5_1 or above
• tensorflow, 1.13 (FreeBSD package provided in Vulture Repository)

Darwin configuration

Example of darwin configuration for this filter :

{
    "dga_1": {
        "exec_path": "/path/to/darwin/build/darwin_dga",
        "config_file":"/path/to/filter.conf",
        "output": "LOG",
        "next_filter": "",
        "nb_thread": 1,
        "log_level": "WARNING",
        "cache_size": 1000
    }
}

Config file

• token_map_path : full path to the .csv file making the correspondence between the characters found in the domain and a token
• model_path : full path to the .pb file representing the IA model (Tensorflow model)
• max_tokens (optional) : max number of tokens to take into account when tokenizing domain name (see token_map_path)
• redis_socket_path (optional) : the redis in which the filter will stock the data
• alert_redis_list_name (optional) : the key under which the filter will stock the raised alerts in the redis
• alert_redis_channel_name (optional) : the redis channel in which the raised alerts will be publish
• log_file_path (optional) : the path in which the filter will write raised alerts

Example :

{
    "model_path": "/home/darwin/conf/fdga/model.pb",
    "token_map_path": "/home/darwin/conf/fdga/tokens.csv",
    "max_tokens": 150,
    "redis_socket_path": "/var/sockets/redis/redis.sock",
    "alert_redis_list_name": "darwin_alerts",
    "alert_redis_channel_name": "darwin.alerts",
    "log_file_path": "/var/log/darwin/alerts.log"
}

Body

[
    ["<domain1>"],
    ["<domain2>"],
    ...
]

Example

Here is an example of a body:

[
    ["intgmxdeadnxuyla.com"],
    ["google.com"],
    ["www.advens.fr"]
]

Results

if output is set to LOGS:

{"evt_id": <uuid>, "time": "<ISO8601>", "filter": "dga", "domain": "<domain>", "dga_prob": <certitude>}