Malware found but not remediated

Rule ID

PH_Rule_Vuln_2

Default Status

Enabled

Description

Detects that host anti-virus or content inspection devices found a virus but could not remediate it

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

T1041

Exfiltration Over C2 Channel

Adversaries may steal data by exfiltrating it over an existing command and control channel. Stolen data is encoded into the normal communications channel using the same protocol as command and control communications.

https://attack.mitre.org/techniques/T1041

Impacts

Server

Data Source

FortiGate via Syslog, FortiProxy via Syslog, FortiEMS via Syslog, CrowdStrike Falcon via FALCON_STREAMING_API/FALCON_DATA_REPLICATOR, SentinelOne via Syslog, Symantec Endpoint Protection Service via Syslog, Microsoft Defender for Endpoint via HTTPS_ADVANCED, FortiEDR via Syslog, Cisco FireAMP via ESTREAMER_SDK/FIREAMP_CLOUD_API,Palo Alto Traps Endpoint Security Manager via Syslog, Carbon Black Security Platform via Syslog, Cylance Protect 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.

300 seconds

Trigger Conditions

If the following defined pattern/s occur within a 300 second time window.

VirusFound

SubPattern Definitions

SubPattern Name: VirusFound

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

eventType IN (Group@PH_SYS_EVENT_Worm_Remedy_Failed, Group@PH_SYS_EVENT_GenMalware_Remedy_Failed) AND reptDevIpAddr IN (Group@PH_SYS_APP_SEC_MGMT,Group@PH_SYS_DEVICE_SEC_GW)

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

computer,virusName,fileName

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

 hostName=VirusFound.computer,
 virusName = VirusFound.virusName,
fileName = VirusFound.fileName

FortiSIEM Rules