Splunk unknown stable spl

Windows BitLocker Suspicious Command Usage

This analytic is developed to detect the usage of BitLocker commands used to disable or impact boot settings. The malware ShrinkLocker uses various commands change how BitLocker handles encryption, potentially bypassing TPM requirements, enabling BitLocker without TPM, and enforcing specific startup key and PIN configurations. Such modifications can weaken system security, making it easier for unauthorized access and data breaches. Detecting these changes is crucial for maintaining robust encryption and data protection.

View Source

Detection Logic

| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime 
FROM datamodel=Endpoint.Processes
  
WHERE Processes.process_name = manage-bde.exe
    
AND
    Processes.process IN ("* -protectors -disable *","* -protectors -delete *","* -forcerecovery *","* -lock *")
  BY Processes.action Processes.dest Processes.original_file_name
     Processes.parent_process Processes.parent_process_exec Processes.parent_process_guid
     Processes.parent_process_id Processes.parent_process_name Processes.parent_process_path
     Processes.process Processes.process_exec Processes.process_guid
     Processes.process_hash Processes.process_id Processes.process_integrity_level
     Processes.process_name Processes.process_path Processes.user
     Processes.user_id Processes.vendor_product
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `windows_bitlocker_suspicious_command_usage_filter`

False Positives

⚠ Administrators may enable or disable this feature that may cause some false positive.

Field Validations

Loading…

Comments (0)

Loading comments...