The following analytic will detect a suspicious process running in a file path where a process is not commonly seen and is most commonly used by malicious software. This behavior has been used by adversaries where they drop and run an exe in a path that is accessible without admin privileges.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2021-05-05
- Author: Teoderick Contreras, Splunk
- ID: 9be25988-ad82-11eb-a14f-acde48001122
Kill Chain Phase
1 2 3 4 5 6 | tstats `security_content_summariesonly` count values(Processes.process_name) as process_name values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_path = "*\\windows\\fonts\\*" OR Processes.process_path = "*\\windows\\temp\\*" OR Processes.process_path = "*\\users\\public\\*" OR Processes.process_path = "*\\windows\\debug\\*" OR Processes.process_path.file_path = "*\\Users\\Administrator\\Music\\*" OR Processes.process_path.file_path = "*\\Windows\\servicing\\*" OR Processes.process_path.file_path = "*\\Users\\Default\\*" OR Processes.process_path.file_path = "*Recycle.bin*" OR Processes.process_path = "*\\Windows\\Media\\*" OR Processes.process_path = "\\Windows\\repair\\*" OR Processes.process_path = "*\\temp\\*" OR Processes.process_path = "*\\PerfLogs\\*" by Processes.parent_process_name Processes.parent_process Processes.process_path Processes.dest Processes.user | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `suspicious_process_file_path_filter`
The SPL above uses the following Macros:
suspicious_process_file_path_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
Supported Add-on (TA)
List of Splunk Add-on’s tested to work with the analytic.
List of fields required to use this analytic.
How To Implement
To successfully implement this search you need to be ingesting information on process that include the name of the process responsible for the changes from your endpoints into the
Endpoint datamodel in the
Known False Positives
Administrators may allow execution of specific binaries in non-standard paths. Filter as needed.
Associated Analytic Story
- Data Destruction
- Double Zero Destructor
- Hermetic Wiper
- DarkCrystal RAT
- Brute Ratel C4
|35.0||70||50||Suspicioues process $Processes.process_path.file_path$ running from suspicious location|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
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