DNS Traffic to Anomali ThreatStream Malware Domains

Rule ID

PH_Rule_Vuln_26

Default Status

Enabled

Description

Detects DNS traffic to Anomali ThreatStream malware domains

Severity

MITRE ATT&CK® Tactics

Exfiltration

Exfiltration consists of techniques that adversaries may use to steal data from your network. Once they’ve collected data, adversaries often package it to avoid detection while removing it. This can include compression and encryption. Techniques for getting data out of a target network typically include transferring it over their command and control channel or an alternate channel and may also include putting size limits on the transmission.

https://attack.mitre.org/tactics/TA0010

MITRE ATT&CK® Techniques

T1048.001

Exfiltration Over Alternative Protocol: Exfiltration Over Symmetric Encrypted Non-C2 Protocol

Adversaries may steal data by exfiltrating it over a symmetrically encrypted network protocol other than that of the existing command and control channel. The data may also be sent to an alternate network location from the main command and control server.

https://attack.mitre.org/techniques/T1048/001

Impacts

Network

Data Source

Cisco Umbrella via AWS_S3,Cisco Umbrella via HTTPS_ADVANCED (Umbrella API), Windows DNS via FortiSIEM Agent, Windows Sysmon via FortiSIEM Agent, BIND DNS via Syslog, FortiGate via Syslog, FortiProxy via Syslog

Detection

Correlation

Remediation Guidance

No remediation guidance specified

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

600 seconds

Trigger Conditions

If the following defined pattern/s occur within a 600 second time window.

Threatstream

SubPattern Definitions

SubPattern Name: Threatstream

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

destName IN (Group@PH_SYS_MAL_DOMAIN_THREATSTREAM) AND eventType IN (Group@PH_SYS_EVENT_CommonDNSTraffic)

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

srcIpAddr, destName

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

COUNT(*) >= 1

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 srcIpAddr = Threatstream.srcIpAddr,
 destName = Threatstream.destName

FortiSIEM Rules