Name:Impacket Lateral Movement smbexec CommandLine Parameters id:bb3c1bac-6bdf-4aa0-8dc9-068b8b712a76 version:4 date:2024-11-28 author:Michael Haag, Splunk status:production type:TTP Description:The following analytic identifies suspicious command-line parameters associated with the use of Impacket's smbexec.py for lateral movement. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on specific command-line patterns indicative of Impacket tool usage. This activity is significant as both Red Teams and adversaries use Impacket for remote code execution and lateral movement. If confirmed malicious, this activity could allow attackers to execute commands on remote endpoints, potentially leading to unauthorized access, data exfiltration, or further compromise of the network. Data_source:
-Sysmon EventID 1
-Windows Event Log Security 4688
-CrowdStrike ProcessRollup2
search:| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_name=cmd.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)` | where match(process, "(?i)cmd\.exe\s+\/Q\s+\/c") AND match(process,"(?i)echo\s+cd") AND match(process, "(?i)\\__output") AND match(process, "(?i)C:\\\\Windows\\\\[a-zA-Z]{1,8}\\.bat") AND match(process, "\\\\127\.0\.0\.1\\.*") | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `impacket_lateral_movement_smbexec_commandline_parameters_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:Although uncommon, Administrators may leverage Impackets tools to start a process on remote systems for system administration or automation use cases. References: -https://attack.mitre.org/techniques/T1021/002/ -https://attack.mitre.org/techniques/T1021/003/ -https://attack.mitre.org/techniques/T1047/ -https://attack.mitre.org/techniques/T1053/ -https://attack.mitre.org/techniques/T1053/005/ -https://github.com/SecureAuthCorp/impacket -https://vk9-sec.com/impacket-remote-code-execution-rce-on-windows-from-linux/ -https://www.microsoft.com/security/blog/2022/01/15/destructive-malware-targeting-ukrainian-organizations/ -https://www.microsoft.com/en-us/security/blog/2023/05/24/volt-typhoon-targets-us-critical-infrastructure-with-living-off-the-land-techniques/ drilldown_searches: name:'View the detection results for - "$dest$"' search:'%original_detection_search% | search dest = "$dest$"' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' name:'View risk events for the last 7 days for - "$dest$"' search:'| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`' earliest_offset:'$info_min_time$' latest_offset:'$info_max_time$' tags: analytic_story: - 'WhisperGate' - 'Active Directory Lateral Movement' - 'Volt Typhoon' - 'Prestige Ransomware' - 'Industroyer2' - 'Data Destruction' - 'Graceful Wipe Out Attack' - 'Compromised Windows Host' - 'CISA AA22-277A' asset_type:Endpoint atomic_guid: confidence:70 impact:90 message:Suspicious command-line parameters on $dest$ may represent lateral movement using smbexec. mitre_attack_id: - 'T1021' - 'T1021.002' - 'T1021.003' - 'T1047' - 'T1543.003' observable: name:'dest' type:'Endpoint' - 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:63 security_domain:endpoint
