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Cisco Umbrella DNS

Overview

Cisco Umbrella offers flexible, cloud-delivered security. It combines multiple security functions into one solution, so that protection can be extended to devices, remote users, and distributed locations anywhere.

The following Sekoia.io built-in rules match the intake Cisco Umbrella DNS. This documentation is updated automatically and is based solely on the fields used by the intake which are checked against our rules. This means that some rules will be listed but might not be relevant with the intake.

SEKOIA.IO x Cisco Umbrella DNS on ATT&CK Navigator

Cisco Umbrella Threat Detected

Cisco Umbrella has detected a malicious traffic categorized as malware, phishing or adware.

  • Effort: intermediate
SEKOIA.IO Intelligence Feed

Detect threats based on indicators of compromise (IOCs) collected by SEKOIA's Threat and Detection Research team.

  • Effort: elementary
Sliver DNS Beaconing

Detects suspicious DNS queries known from Sliver beaconing

  • Effort: intermediate

Event Categories

The following table lists the data source offered by this integration.

Data Source Description
DNS records DNS queries are fully analyzed
Network device logs DNS queries logged by Umbrella DNS

Event Samples

Find below few samples of events and how they are normalized by Sekoia.io.

{
    "message": " \"2021-02-21 15:30:49\",\"CORP - IP INTERNET\",\"CORP - IP INTERNET\",\"1.1.1.1\",\"1.1.1.1\",\"Blocked\",\"1 (A)\",\"NOERROR\",\"something.net\",\"DNS Tunneling VPN\",\"Networks\",\"Networks\",\"DNS Tunneling VPN\"",
    "event": {
        "outcome": "success"
    },
    "action": {
        "name": "DNS query",
        "outcome": "success",
        "properties": {
            "Categories": "DNS Tunneling VPN"
        },
        "target": "network-traffic",
        "type": "blocked"
    },
    "dns": {
        "question": {
            "name": "something.net",
            "registered_domain": "something.net",
            "top_level_domain": "net",
            "type": "A"
        },
        "response_code": "NOERROR",
        "size_in_char": "13",
        "type": "query"
    },
    "related": {
        "hosts": [
            "something.net"
        ],
        "ip": [
            "1.1.1.1"
        ],
        "user": [
            "CORP - IP INTERNET"
        ]
    },
    "source": {
        "address": "1.1.1.1",
        "ip": "1.1.1.1",
        "nat": {
            "ip": "1.1.1.1"
        }
    },
    "user": {
        "name": "CORP - IP INTERNET"
    }
}
{
    "message": " \"2020-06-12 14:29:47\",\"client\",\"client,FRBCORP\",\"1.1.1.1\",\"2.2.2.2\",\"Allowed\",\"1 (A)\",\"NOERROR\",\"client group\",\"Software/Technology,Business Services,Infrastructure,SaaS and B2B,Science and Technology,Application\",\"AD Users\",\"AD Users,Roaming Computers\",\"\"",
    "event": {
        "outcome": "success"
    },
    "action": {
        "name": "DNS query",
        "outcome": "success",
        "properties": {
            "Categories": "Software/Technology,Business Services,Infrastructure,SaaS and B2B,Science and Technology,Application"
        },
        "target": "network-traffic",
        "type": "allowed"
    },
    "dns": {
        "question": {
            "name": "client group",
            "type": "A"
        },
        "response_code": "NOERROR",
        "size_in_char": "12",
        "type": "query"
    },
    "related": {
        "hosts": [
            "client group"
        ],
        "ip": [
            "1.1.1.1",
            "2.2.2.2"
        ],
        "user": [
            "client"
        ]
    },
    "source": {
        "address": "1.1.1.1",
        "ip": "1.1.1.1",
        "nat": {
            "ip": "2.2.2.2"
        }
    },
    "user": {
        "name": "client"
    }
}
{
    "message": " \"2020-06-12 14:29:48\",\"ERT - IP INTERNET\",\"ERT - IP INTERNET\",\"1.1.1.1\",\"1.1.1.1\",\"Allowed\",\"Other\",\"NXDOMAIN\",\"_ldap._tcp.dc._msdcs.subdomain.corp.intra.\",\"\",\"Networks\",\"Networks\",\"\"",
    "event": {
        "outcome": "failure"
    },
    "action": {
        "name": "DNS query",
        "outcome": "failure",
        "outcome_reason": "NXDOMAIN",
        "target": "network-traffic",
        "type": "allowed"
    },
    "dns": {
        "question": {
            "name": "_ldap._tcp.dc._msdcs.subdomain.corp.intra.",
            "subdomain": "_ldap._tcp.dc._msdcs.subdomain.corp"
        },
        "response_code": "NXDOMAIN",
        "size_in_char": "42",
        "type": "query"
    },
    "related": {
        "hosts": [
            "_ldap._tcp.dc._msdcs.subdomain.corp.intra."
        ],
        "ip": [
            "1.1.1.1"
        ],
        "user": [
            "ERT - IP INTERNET"
        ]
    },
    "source": {
        "address": "1.1.1.1",
        "ip": "1.1.1.1",
        "nat": {
            "ip": "1.1.1.1"
        }
    },
    "user": {
        "name": "ERT - IP INTERNET"
    }
}
{
    "message": "\"2024-03-04 11:17:25\",\"Firstname LASTNAME (firstname.lastname@corp.com)\",\"Firstname LASTNAME \n(firstname.lastname@corp.com),FR01-MDBBC-L029.hdb.int,CORP_RANGE_01,CORP\",\"10.1.1.1\",\"80.1.1.1\",\"Allowed\",\"1 (A)\",\"NXDOMAIN\",\"10.1.1.1_1.\",\"\",\"AD Users\",\"AD Users,AD \nComputers,Internal Networks,Sites\",\"\"",
    "event": {
        "outcome": "failure"
    },
    "action": {
        "name": "DNS query",
        "outcome": "failure",
        "outcome_reason": "NXDOMAIN",
        "target": "network-traffic",
        "type": "allowed"
    },
    "dns": {
        "question": {
            "name": "10.1.1.1_1.",
            "subdomain": "10.1.1",
            "type": "A"
        },
        "response_code": "NXDOMAIN",
        "size_in_char": "11",
        "type": "query"
    },
    "related": {
        "hosts": [
            "10.1.1.1_1."
        ],
        "ip": [
            "10.1.1.1",
            "80.1.1.1"
        ],
        "user": [
            "Firstname LASTNAME (firstname.lastname@corp.com)"
        ]
    },
    "source": {
        "address": "10.1.1.1",
        "ip": "10.1.1.1",
        "nat": {
            "ip": "80.1.1.1"
        }
    },
    "user": {
        "name": "Firstname LASTNAME (firstname.lastname@corp.com)"
    }
}

Extracted Fields

The following table lists the fields that are extracted, normalized under the ECS format, analyzed and indexed by the parser. It should be noted that infered fields are not listed.

Name Type Description
action.properties.Categories keyword
action.target keyword the target of the action
dns.question.name keyword The name being queried.
dns.question.type keyword The type of record being queried.
dns.response_code keyword The DNS response code.
dns.size_in_char keyword
dns.type keyword The type of DNS event captured, query or answer.
source.ip ip IP address of the source.
source.nat.ip ip Source NAT ip
user.name keyword Short name or login of the user.

Configure

This setup guide will show you how to forward logs produced by CISCO Umbrella service to Sekoia.io by means of an Rsyslog transport channel.

Collect proxylogs files and send them to rsyslog

After configuring Umbrella Log Management with AWS S3, the logs you download will be gzipped CSVs in appropriate subfolder with the following naming format:

dnslogs/<year>-<month>-<day>/<year>-<month>-<day>-<hour>-<minute>.csv.gz

To send these logs to Sekoia.io, we suggest the use of the logger Unix command. For each unzipped file, use the following command line:

logger -t dnslogs -f <YYYY>-<MM>-<DD>-<hh>-<mm>-<xxxx>.csv

Configure the Rsyslog server

Please consult the Rsyslog Transport documentation to forward these logs to Sekoia.io.

Further Readings