TransformIndicatorToMSDefenderIOC

Source

from CommonServerPython import *

POPULATE_INDICATOR_FIELDS = [
    "value",
    "indicator_type",
    "applications",
    "user",
    "firstSeen",
    "expiration",
    "lastSeen",
    "score",
    "title",
    "description",
]

INDICATOR_FIELDS_TO_MS_DEFENDER_IOC = {
    "value": "indicatorValue",
    "indicator_type": "indicatorType",
    "applications": "application",
    "user": "createdBy",
    "firstSeen": "creationTimeDateTimeUtc",
    "expiration": "expirationTime",
    "lastSeen": "lastUpdateTime",
    "score": "Severity",
    "title": "title",
    "description": "description",
    # enter (hard-coded) your wanted indicator arguments per MS docs (make sure to remove the '#'):
    # {https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/ti-indicator?view=o365-worldwide} ##
    # "" : "externalID",
    # "" : "sourceType",
    # "" : "lastUpdatedBy",
    # "" : "recommendedActions",
    # "" : "rbacGroupNames",
    # "" : "rbacGroupIds",
    # "" : "generateAlert",
    # "" : "createdBySource",
}

# feel free to change it hard-coded.
# Possible values in MS Defender are: Informational, Low, Medium and High
DBOT_SCORE_TO_MS_DEFENDER_SEVERITY = {
    Common.DBotScore.BAD: "High",
    Common.DBotScore.SUSPICIOUS: "Medium",
    Common.DBotScore.GOOD: "Informational",
    Common.DBotScore.NONE: "Informational",
}


def convert_unique_fields(ioc, action):
    ioc["Severity"] = DBOT_SCORE_TO_MS_DEFENDER_SEVERITY[ioc.get("Severity")]  # XSOAR indicators always have score
    if ioc.get("indicatorType"):
        indicator_type = ioc.get("indicatorType")
        indicator_value = ioc.get("indicatorValue", "")
        if indicator_type == "File":
            hash_type = get_hash_type(indicator_value)
            if hash_type == "md5":
                ioc["indicatorType"] = "FileMd5"
            elif hash_type == "sha1":
                ioc["indicatorType"] = "FileSha1"
            if hash_type == "sha256":
                ioc["indicatorType"] = "FileSha256"
        elif indicator_type == "IP":
            ioc["indicatorType"] = "IpAddress"
        elif indicator_type == "DOMAIN":
            ioc["indicatorType"] = "DomainName"
        elif indicator_type == "URL":
            ioc["indicatorType"] = "Url"
        else:
            raise DemistoException(f"The indicator type: {indicator_type} does not exist in MS Defender")
    # if you want to map the action field, you can do it here.
    # Note: the action arg is mandatory with MS Defender api
    # Possible values are: "Warn", "Block", "Audit", "Alert", "AlertAndBlock", "BlockAndRemediate" and "Allowed".
    ioc["action"] = action
    # Note: the title arg is mandatory with MS Defender api, please change it
    if not ioc.get("title"):
        ioc["title"] = "XSOAR Indicator title"
    # Note: the description arg is mandatory with MS Defender api, please change it
    if not ioc.get("description"):
        ioc["description"] = "XSOAR Indicator description"
    return ioc


def get_indicators_by_query():
    action = demisto.args().pop("action")
    demisto.args().update({"populateFields": POPULATE_INDICATOR_FIELDS})
    indicators = execute_command("GetIndicatorsByQuery", args=demisto.args())
    ms_defender_iocs = []
    if indicators:
        for indicator in indicators:
            # convert XSOAR indicator to MS Defender IOC
            ms_defender_ioc = {
                INDICATOR_FIELDS_TO_MS_DEFENDER_IOC[indicator_field]: indicator_value
                for (indicator_field, indicator_value) in indicator.items()
            }
            ms_defender_ioc = convert_unique_fields(ms_defender_ioc, action)
            ms_defender_iocs.append(ms_defender_ioc)
    return ms_defender_iocs


def main():
    try:
        ms_defender_iocs = get_indicators_by_query()
        human_readable = tableToMarkdown(
            "TransformIndicatorToMSDefenderIOC is done:",
            ms_defender_iocs,
            removeNull=True,
            headers=list(INDICATOR_FIELDS_TO_MS_DEFENDER_IOC.values()),
        )
        context = {
            "TransformIndicatorToMSDefenderIOC.JsonOutput": json.dumps(ms_defender_iocs),
            "TransformIndicatorToMSDefenderIOC.Indicators": ms_defender_iocs,
        }
        demisto.results(
            {
                "Type": entryTypes["note"],
                "ContentsFormat": formats["text"],
                "Contents": ms_defender_iocs,
                "EntryContext": context,
                "HumanReadable": human_readable,
            }
        )

    except Exception as ex:
        return_error(f"Failed to execute TransformIndicatorToMSDefenderIOC. Error: {ex!s}")


if __name__ in ("__main__", "__builtin__", "builtins"):
    main()

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