Name:CMD Carry Out String Command Parameter id:54a6ed00-3256-11ec-b031-acde48001122 version:6 date:2024-10-17 author:Teoderick Contreras, Bhavin Patel, Splunk status:production type:Hunting Description:The following analytic detects the use of `cmd.exe /c` to execute commands, a technique often employed by adversaries and malware to run batch commands or invoke other shells like PowerShell. This detection leverages data from Endpoint Detection and Response (EDR) agents, focusing on command-line executions and process metadata. Monitoring this activity is crucial as it can indicate script-based attacks or unauthorized command execution. If confirmed malicious, this behavior could lead to unauthorized code execution, privilege escalation, or persistence within the environment. Data_source:
-Sysmon EventID 1
-Windows Event Log Security 4688
-CrowdStrike ProcessRollup2
search:| tstats `security_content_summariesonly` min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_cmd` AND Processes.process="* /c*" by Processes.dest Processes.user Processes.parent_process_name Processes.parent_process Processes.process_name Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `cmd_carry_out_string_command_parameter_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 may be high based on legitimate scripted code in any environment. Filter as needed. References: -https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/ -https://www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/ drilldown_searches:
: tags: analytic_story: - 'AsyncRAT' - 'Winter Vivern' - 'WhisperGate' - 'Living Off The Land' - 'DarkGate Malware' - 'ProxyNotShell' - 'Log4Shell CVE-2021-44228' - 'NjRAT' - 'RedLine Stealer' - 'Rhysida Ransomware' - 'IcedID' - 'Chaos Ransomware' - 'PlugX' - 'Azorult' - 'Qakbot' - 'Hermetic Wiper' - 'Warzone RAT' - 'DarkCrystal RAT' - 'CISA AA23-347A' - 'Data Destruction' asset_type:Endpoint automated_detection_testing:passed confidence:50 cve: - 'CVE-2021-44228' impact:60 message:An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ by user $user$ attempting spawn a new process. mitre_attack_id: - 'T1059.003' - 'T1059' observable: name:'dest' type:'Endpoint' - role: - 'Victim' name:'user' type:'User' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - '_time' - 'Processes.parent_process_name' - 'Processes.parent_process' - 'Processes.process_name' - 'Processes.process_id' - 'Processes.process' - 'Processes.dest' - 'Processes.user' - 'Processes.process_id' - 'Processes.parent_process_id' risk_score:30 security_domain:endpoint
