splApache-2.0from splunk/security_content

Windows Data Destruction Recursive Exec Files Deletion

The following analytic identifies a suspicious process that is recursively deleting executable files on a compromised host. It leverages Sysmon Event Codes 23 and 26 to detect this activity by monitoring for a high volume of deletions or overwrites of files with extensions like .exe, .sys, and .dll. This behavior is significant as it is commonly associated with destructive malware such as CaddyWiper, DoubleZero, and SwiftSlicer, which aim to make file recovery impossible. If confirmed malicious, this activity could lead to significant data loss and system instability, severely impacting business operations.

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FP risk

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Rule sourcedetections/endpoint/windows_data_destruction_recursive_exec_files_deletion.yml

`sysmon` EventCode IN ("23","26") TargetFilename IN ("*.exe", "*.sys", "*.dll")
  | bin _time span=2m
  | stats count min(_time) as firstTime, max(_time) as lastTime values(file_path) as file_path values(file_hash) as file_hash values(file_name) as file_name values(file_modify_time) as file_modify_time values(process_name) as process_name values(process_path) as process_path values(process_guid) as process_guid values(process_id) as process_id values(process_exec) as process_exec
    BY action dest dvc
       signature signature_id user
       user_id vendor_product
  | where count >=100
  | `security_content_ctime(firstTime)`
  | `security_content_ctime(lastTime)`
  | `windows_data_destruction_recursive_exec_files_deletion_filter`