Name:Windows Network Connection From Program In Suspect Location id:90fd571b-78d4-409e-a2de-0f0a80c75a84 version:2 date:None author:Raven Tait, Splunk status:production type:Anomaly Description:The following analytic detects network connections from processes running out of suspicious Windows directories such as Recycle Bin, Public, PerfLogs, systemprofile, Fonts, IME, and Addins paths.
This activity is significant because malware often executes from writable or unusual directories while communicating with external infrastructure.
If confirmed malicious, the process may represent command-and-control, staging, or data exfiltration activity from a compromised endpoint. Data_source:
-Sysmon EventID 3
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime
how_to_implement:The detection is based on data that originates from Endpoint Detection and Response (EDR) agents. These agents are designed to provide security-related telemetry from the endpoints where the agent is installed. To implement this search, you must ingest logs that contain the process GUID, process name, and parent process. Additionally, you must ingest complete command-line executions. These logs must be processed using the appropriate Splunk Technology Add-ons that are specific to the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint` data model. Use the Splunk Common Information Model (CIM) to normalize the field names and speed up the data modeling process. known_false_positives:Some legitimate system or security tools may run from these folders and create network connections. Review and allow trusted processes to reduce false positives. References: -https://github.com/Neo23x0/sigma/blob/master/rules/windows/sysmon/sysmon_susp_prog_location_network_connection.yml drilldown_searches: earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View the detection results for - "$user$" and "$dest$"' search:'%original_detection_search% | search user = "$user$" dest = "$dest$"' name:'View risk events for the last 7 days for - "$user$" and "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$user$", "$dest$") | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'7d' latest_offset:'0' analytic_story:['Compromised Windows Host']
