Name:Windows BitLockerToGo Process Execution id:68cbc9e9-2882-46f2-b636-3b5080589d58 version:1 date:2024-11-13 author:Michael Haag, Nasreddine Bencherchali, Splunk status:production type:Hunting Description:The following analytic detects BitLockerToGo.exe execution, which has been observed being abused by Lumma stealer malware. The malware leverages this legitimate Windows utility to manipulate registry keys, search for cryptocurrency wallets and credentials, and exfiltrate sensitive data. This activity is significant because BitLockerToGo.exe provides functionality for viewing, copying, and writing files as well as modifying registry branches - capabilities that the Lumma stealer exploits. However, note that if legitimate use of BitLockerToGo.exe is in the organization, this detection will Data_source:
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=bitlockertogo.exe by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `windows_bitlockertogo_process_execution_filter`
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:False positives are likely, as BitLockerToGo.exe is a legitimate Windows utility used for managing BitLocker encryption. However, monitor for usage of BitLockerToGo.exe in your environment, tune as needed. If BitLockerToGo.exe is not used in your environment, move to TTP. References: -https://securelist.com/fake-captcha-delivers-lumma-amadey/114312/ drilldown_searches:
: tags: analytic_story: - 'Lumma Stealer' asset_type:Endpoint confidence:80 impact:70 message:BitLockerToGo.exe was executed on $dest$ by $user$. mitre_attack_id: - 'T1218' observable: name:'dest' type:'Endpoint' - role: - 'Victim' name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - 'Processes.process_name' - 'Processes.dest' - 'Processes.user' - 'Processes.parent_process_name' - 'Processes.process' - 'Processes.process_id' - 'Processes.parent_process_id' risk_score:70 security_domain:endpoint
