Detection: Detect Remote Access Software Usage FileInfo

Description

The following analytic detects the execution of processes with file or code signing attributes from known remote access software within the environment. It leverages Sysmon EventCode 1 data and cross-references a lookup table of remote access utilities such as AnyDesk, GoToMyPC, LogMeIn, and TeamViewer. This activity is significant as adversaries often use these tools to maintain unauthorized remote access. If confirmed malicious, this could allow attackers to persist in the environment, potentially leading to data exfiltration or further compromise of the network.

Search

1`sysmon` EventCode=1 
2| stats count min(_time) as firstTime max(_time) as lastTime, values(Company) as Company values(Product) as Product by dest, user, parent_process_name, process_name, process 
3| lookup remote_access_software remote_utility_fileinfo AS Product OUTPUT isutility, description as signature, comment_reference as desc, category 
4| search isutility = True 
5| `remote_access_software_usage_exceptions` 
6| `detect_remote_access_software_usage_fileinfo_filter`

Data Source

Name	Platform	Sourcetype	Source
CrowdStrike ProcessRollup2	N/A	'crowdstrike:events:sensor'	'crowdstrike'
Sysmon EventID 1	Windows	'xmlwineventlog'	'XmlWinEventLog:Microsoft-Windows-Sysmon/Operational'
Windows Event Log Security 4688	Windows	'xmlwineventlog'	'XmlWinEventLog:Security'

Macros Used

Annotations

Default Configuration

This detection is configured by default in Splunk Enterprise Security to run with the following settings:

Implementation

This analytic relies on Sysmon to be properly installed and utilized in the environment. Ensure that proper logging is setup for Sysmon and data is being ingested into Splunk. The "exceptions" macro leverages both an Assets and Identities lookup, as well as a KVStore collection named "remote_software_exceptions" that lets you track and maintain device-based exceptions for this set of detections.

Known False Positives

Known or approved applications used by the organization or usage of built-in functions. Known false positives can be added to the remote_access_software_usage_exception.csv lookup to globally suppress these situations across all remote access content

Associated Analytic Story

• Command And Control

• Gozi Malware

• Insider Threat

• Ransomware

Risk Based Analytics (RBA)

References

• https://attack.mitre.org/techniques/T1219/

• https://thedfirreport.com/2022/08/08/bumblebee-roasts-its-way-to-domain-admin/

• https://thedfirreport.com/2022/11/28/emotet-strikes-again-lnk-file-leads-to-domain-wide-ransomware/

Detection Testing

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

Source: GitHub | Version: 4