PH_Rule_SIGMA_7
Enabled
Detect remote login by Administrator user (depending on internal pattern). This rule is adapted from https://github.com/SigmaHQ/sigma/blob/master/rules/windows/builtin/security/account_management/win_security_admin_rdp_login.yml
3
Security
Defense Evasion
Defense Evasion consists of techniques that adversaries use to avoid detection throughout their compromise. Techniques used for defense evasion include uninstalling/disabling security software or obfuscating/encrypting data and scripts. Adversaries also leverage and abuse trusted processes to hide and masquerade their malware. Other tactics’ techniques are cross-listed here when those techniques include the added benefit of subverting defenses.
https://attack.mitre.org/tactics/TA0005T1078.003
Valid Accounts: Local Accounts
Adversaries may obtain and abuse credentials of a local account as a means of gaining Initial Access, Persistence, Privilege Escalation, or Defense Evasion. Local accounts are those configured by an organization for use by users, remote support, services, or for administration on a single system or service. Local Accounts may also be abused to elevate privileges and harvest credentials through [OS Credential Dumping.
https://attack.mitre.org/techniques/T1078/003Server
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-4624" AND winLogonType=10 AND authenMethod="Negotiate" AND user REGEXP "^Admin"
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
authenMethod,hostName,user,winLogonType
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
authenMethod = Filter.authenMethod,
hostName = Filter.hostName,
user = Filter.user,
winLogonType = Filter.winLogonType