PH_RULE_MS_RCE_CVE2022_26809_Activity_Host
Enabled
A Fortinet product has detected Microsoft Driver RCE vulnerability (CVE-2022-26809) activity on a host
9
Security
Lateral Movement
Lateral Movement consists of techniques that adversaries use to enter and control remote systems on a network. Following through on their primary objective often requires exploring the network to find their target and subsequently gaining access to it. Reaching their objective often involves pivoting through multiple systems and accounts to gain. Adversaries might install their own remote access tools to accomplish Lateral Movement or use legitimate credentials with native network and operating system tools, which may be stealthier.
https://attack.mitre.org/tactics/TA0008T1021.002
Remote Services: SMB/Windows Admin Shares
Adversaries may use Valid Accounts to interact with a remote network share using Server Message Block (SMB). The adversary may then perform actions as the logged-on user.
https://attack.mitre.org/techniques/T1021/002Server
FortiClient via Syslog
Correlation
Check if the source is patched for the CVE associated with the event. If yes then remove the host from the network and patch immediately. If host is not scanned then determine if the host is running the affected version of the application. If yes then patch immediately, else it is likely a false positive.
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.
rce
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 = "FortiClient-vulnerabilityscan-vulnerability-record" AND vulnId = 72056
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
hostIpAddr
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
hostIpAddr=rce.hostIpAddr,
incidentCount=rce.COUNT(*)