cef_export.py

import json
import base64
import datetime

misperrors = {'error': 'Error'}

# possible module-types: 'expansion', 'hover' or both
moduleinfo = {'version': '1', 'author': 'Hannah Ward',
              'description': 'Export a module in CEF format',
              'module-type': ['export']}

# config fields that your code expects from the site admin
moduleconfig = ["Default_Severity", "Device_Vendor", "Device_Product", "Device_Version"]

cefmapping = {"ip-src": "src", "ip-dst": "dst", "hostname": "dhost", "domain": "dhost",
              "md5": "fileHash", "sha1": "fileHash", "sha256": "fileHash",
              "url": "request"}

mispattributes = {'input': list(cefmapping.keys())}
outputFileExtension = "cef"
responseType = "application/txt"


def handler(q=False):
    if q is False:
        return False
    request = json.loads(q)
    if "config" in request:
        config = request["config"]
    else:
        config = {"Default_Severity": 1, "Device_Vendor": "MISP",
                  "Device_Product": "MISP", "Device_Version": 1}

    data = request["data"]
    response = ""
    for ev in data:
        event = ev["Attribute"]
        for attr in event:
            if attr["type"] in cefmapping:
                response += "{} host CEF:0|{}|{}|{}|{}|{}|{}|{}={}\n".format(
                            datetime.datetime.fromtimestamp(int(attr["timestamp"])).strftime("%b %d %H:%M:%S"),
                            config["Device_Vendor"],
                            config["Device_Product"],
                            config["Device_Version"],
                            attr["category"],
                            attr["category"],
                            config["Default_Severity"],
                            cefmapping[attr["type"]],
                            attr["value"],
                )

    r = {"response": [], "data": str(base64.b64encode(bytes(response, 'utf-8')), 'utf-8')}
    return r


def introspection():
    modulesetup = {}
    try:
        responseType
        modulesetup['responseType'] = responseType
    except NameError:
        pass
    try:
        userConfig
        modulesetup['userConfig'] = userConfig
    except NameError:
        pass
    try:
        outputFileExtension
        modulesetup['outputFileExtension'] = outputFileExtension
    except NameError:
        pass
    try:
        inputSource
        modulesetup['inputSource'] = inputSource
    except NameError:
        pass
    return modulesetup


def version():
    moduleinfo['config'] = moduleconfig
    return moduleinfo