mirror of
https://github.com/splunk/security_content
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pyth0n1c
79 lines
3.0 KiB
YAML
79 lines
3.0 KiB
YAML
name: Suspicious SearchProtocolHost no Command Line Arguments
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id: f52d2db8-31f9-4aa7-a176-25779effe55c
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version: 3
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date: '2022-03-15'
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author: Michael Haag, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: The following analytic identifies searchprotocolhost.exe with no command
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line arguments. It is unusual for searchprotocolhost.exe to execute with no command
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line arguments present. This particular behavior is common with malicious software,
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including Cobalt Strike. During investigation, identify any network connections
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and parallel processes. Identify any suspicious module loads related to credential
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dumping or file writes. searchprotocolhost.exe is natively found in C:\Windows\system32
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and C:\Windows\syswow64.
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search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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where Processes.process_name=searchprotocolhost.exe by _time span=1h Processes.process_id
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Processes.process_name Processes.dest Processes.process_path Processes.process Processes.parent_process_name
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
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| regex process="(?i)(searchprotocolhost\.exe.{0,4}$)" | `suspicious_searchprotocolhost_no_command_line_arguments_filter`'
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how_to_implement: To successfully implement this search you need to be ingesting information
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on process that include the name of the process responsible for the changes from
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your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
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confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
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endpoint product.
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known_false_positives: Limited false positives may be present in small environments.
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Tuning may be required based on parent process.
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references:
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- https://github.com/mandiant/red_team_tool_countermeasures/blob/master/rules/PGF/supplemental/hxioc/SUSPICIOUS%20EXECUTION%20OF%20SEARCHPROTOCOLHOST%20(METHODOLOGY).ioc
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tags:
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analytic_story:
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- Cobalt Strike
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confidence: 70
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context:
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- Source:Endpoint
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- Stage:Execution
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- Stage:Initial Access
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- Stage:Defense Evasion
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1055/cobalt_strike/windows-sysmon.log
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impact: 70
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kill_chain_phases:
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- Exploitation
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message: Suspicious searchprotocolhost.exe process with no command line arguments
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executed on $dest$ by $user$
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mitre_attack_id:
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- T1055
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observable:
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- name: dest
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type: Endpoint
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role:
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- Victim
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- name: User
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type: User
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role:
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- Victim
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product:
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- Splunk Enterprise
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- Splunk Enterprise Security
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- Splunk Cloud
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required_fields:
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- _time
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- Processes.dest
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- Processes.user
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- Processes.parent_process_name
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- Processes.parent_process
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- Processes.original_file_name
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- Processes.process_name
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- Processes.process
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- Processes.process_id
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- Processes.parent_process_path
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- Processes.process_path
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- Processes.parent_process_id
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risk_score: 49
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security_domain: endpoint
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supported_tas:
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- Splunk_TA_microsoft_sysmon
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asset_type: Endpoint
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