PH_Rule_SIGMA_2328
Enabled
Detects the use of Inveigh a cross-platform .NET IPv4/IPv6 machine-in-the-middle (MITM) tool. In an MITM attack, the adversary positions himself in a conversation between a user and an application, either to eavesdrop or to impersonate one of the parties, making it appear as if a normal exchange of information is underway. The goal of an attack is to steal personal information, such as login credentials, account details and credit card numbers. This rule is adapted from https://github.com/SigmaHQ/sigma/blob/master/rules/windows/process_creation/proc_creation_win_hktl_inveigh.yml
9
Security
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/TA0006T1003.001
OS Credential Dumping: LSASS Memory
Adversaries may attempt to access credential material stored in the process memory of the Local Security Authority Subsystem Service (LSASS).
https://attack.mitre.org/techniques/T1003/001Server
Windows Sysmon via FortiSIEM Agent
Correlation
Determine if this was an authorized penetration testing activity or authorized sysadmin activity. Otherwise, there is no reason for this activity to be occurring. The host should be quarantined and investigated immediately. Collect the process hash and check for malware match. Investigate what other incidents are occurring on that host during that time frame.
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-Sysmon-1-Create-Process" AND (procName REGEXP "\\Inveigh\.exe$" OR srcFileName IN ("\\Inveigh.dll","\\Inveigh.exe") OR description="Inveigh" OR command REGEXP ".* -ReplyToDomains .*|.* -ReplyToIPs .*|.* -ReplyToMACs .*|.* -SnifferIP.*|.* -SpooferIP.*")
This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID
command,description,hostName,procName,srcFileName
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
command = Filter.command,
description = Filter.description,
hostName = Filter.hostName,
procName = Filter.procName,
srcFileName = Filter.srcFileName