This analytic is to detect a high frequency of file deletion relative to process name and process id /etc/ folder. These events was seen in acidrain wiper malware where it tries to delete all files in a non-standard directory in linux directory. This detection already contains some filter that might cause false positive during our testing. But we recommend to add more filter if needed.
- Type: Anomaly
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2023-04-27
- Author: Teoderick Contreras, Splunk
- ID: 9d867448-2aff-4d07-876c-89409a752ff8
Kill Chain Phase
- Actions On Objectives
- CIS 10
1 2 3 4 5 6 7 | tstats `security_content_summariesonly` values(Filesystem.file_name) as deletedFileNames values(Filesystem.file_path) as deletedFilePath dc(Filesystem.file_path) as numOfDelFilePath count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.action=deleted Filesystem.file_path = "/etc/*" by _time span=1h Filesystem.dest Filesystem.process_guid Filesystem.action | `drop_dm_object_name(Filesystem)` | where numOfDelFilePath >= 200 | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `linux_high_frequency_of_file_deletion_in_etc_folder_filter`
The SPL above uses the following Macros:
linux_high_frequency_of_file_deletion_in_etc_folder_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.
List of fields required to use this analytic.
How To Implement
To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you can use the Add-on for Linux Sysmon from Splunkbase.
Known False Positives
linux package installer/uninstaller may cause this event. Please update you filter macro to remove false positives.
Associated Analytic Story
|49.0||70||70||Multiple files delted in /etc/ folder on $dest$ by process GUID - $process_guid$|
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
source | version: 2