Concurrent Successful Authentications To Same Account From Multiple Countries

Rule ID

PH_Rule_Access_61

Default Status

Enabled

Description

Detects simultaneous successful server/network device/domain authentications to the same system and the same account from different countries. This may indicate stolen credentials unless it is an administrative account and is supposed to be accessed by administrators from multiple countries.

Severity

MITRE ATT&CK® Tactics

Credential Access

Credential Access consists of techniques for stealing credentials like account names and passwords. Techniques used to get credentials include keylogging or credential dumping. Using legitimate credentials can give adversaries access to systems, make them harder to detect, and provide the opportunity to create more accounts to help achieve their goals.

https://attack.mitre.org/tactics/TA0006

MITRE ATT&CK® Techniques

T1110.001

Brute Force: Password Guessing

Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts.

https://attack.mitre.org/techniques/T1110/001

Impacts

Server

Data Source

FortiGate via Syslog, FortiProxy via Syslog, Juniper JunOS via Syslog, Juniper SRX Via Syslog, Juniper SSG via Syslog, Pulse Secure via Syslog, Hillstone Firewall Via Syslog, Cisco ASA via Syslog, Cisco IOS Via Syslog, WatchGuard via Syslog, Sophos Firewall via Syslog, SonicOS via Syslog, Riverbed via Syslog, NetScaler via Syslog, HP Procurve via Syslog, FortiWeb via Syslog, BlueCoat via Syslog, Windows via OMI or FortiSIEM Agent, Linux via Syslog, VMware NSX via Syslog, FortiSIEM via Syslog, IBM AIX via Syslog, AWS CloudTrail via AWS_CLOUDTRAIL, Office 365 via Management Activity API

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.

3600 seconds

Trigger Conditions

If the following defined pattern/s occur within a 3600 second time window.

MultiCountryLogon

SubPattern Definitions

SubPattern Name: MultiCountryLogon

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_HostLogonSuccess,Group@PH_SYS_EVENT_DomainLogonSuccess) AND user IS NOT NULL AND srcGeoCountry IS NOT NULL

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

reptDevName,reptDevIpAddr,user

Aggregate Constraint

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

COUNT (DISTINCT srcGeoCountry) >= 2

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

 destName = MultiCountryLogon.reptDevName,
 destIpAddr = MultiCountryLogon.reptDevIpAddr,
 user = MultiCountryLogon.user

FortiSIEM Rules