PH_Rule_SIGMA_79
Enabled
Detects the usage of particular AttributeLDAPDisplayNames, which are known for data exchange via LDAP by the tool LDAPFragger and are additionally not commonly used in companies. This rule is adapted from https://github.com/SigmaHQ/sigma/blob/master/rules/windows/builtin/security/win_security_susp_ldap_dataexchange.yml
7
Security
Command And Control
T1001.003
Data Obfuscation: Protocol Impersonation
Adversaries may impersonate legitimate protocols or web service traffic to disguise command and control activity and thwart analysis efforts. By impersonating legitimate protocols or web services, adversaries can make their command and control traffic blend in with legitimate network traffic.
https://attack.mitre.org/techniques/T1001/003Server
Windows Security Log via OMI or FortiSIEM Agent
Correlation
No remediation guidance specified
If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.
300 seconds
If the following defined pattern/s occur within a 300 second time window.
Filter
This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.
This is the query logic that matches incoming events
eventType="Win-Security-5136" AND propValue REGEXP ".*" AND propName IN ("otherFacsimileTelephoneNumber","primaryInternationalISDNNumber","primaryTelexNumber")
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
hostName,propName,propValue
This is most typically a numerical constraint that defines when the rule should trigger an incident
COUNT(*) >= 1
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 = Filter.hostName,
propName = Filter.propName,
propValue = Filter.propValue