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Eric
95 lines
4.6 KiB
YAML
95 lines
4.6 KiB
YAML
name: Windows PowerShell Process With Malicious String
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id: 5df35d50-e1a3-4a52-a337-92e69d9b1b8a
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version: 4
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date: '2025-05-02'
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author: Steven Dick
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status: production
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type: TTP
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description: The following analytic detects the execution of multiple offensive toolkits
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and commands through the process execution datamodel. This method captures commands
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given directly to powershell.exe, allowing for the identification of suspicious
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activities including several well-known tools used for credential theft, lateral
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movement, and persistence. If confirmed malicious, this could lead to unauthorized
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access, privilege escalation, and potential compromise of sensitive information
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within the environment.
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data_source:
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- Windows Event Log Security 4688
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- Sysmon EventID 1
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- CrowdStrike ProcessRollup2
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search: "| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)\
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\ as lastTime from datamodel=Endpoint.Processes where `process_powershell` \nby\
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\ Processes.action Processes.dest Processes.original_file_name Processes.parent_process\
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\ Processes.parent_process_exec \nProcesses.parent_process_guid Processes.parent_process_id\
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\ Processes.parent_process_name \nProcesses.parent_process_path Processes.process\
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\ Processes.process_exec Processes.process_guid Processes.process_hash \nProcesses.process_id\
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\ Processes.process_integrity_level Processes.process_name Processes.process_path\
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\ \nProcesses.user Processes.user_id Processes.vendor_product \n| `drop_dm_object_name(Processes)`\
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\ \n| `security_content_ctime(firstTime)`\n| `security_content_ctime(lastTime)`\n\
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| lookup malicious_powershell_strings command as process\n| where isnotnull(match)\n\
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| `windows_powershell_process_with_malicious_string_filter`"
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how_to_implement: The detection is based on data that originates from Endpoint Detection
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and Response (EDR) agents. These agents are designed to provide security-related
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telemetry from the endpoints where the agent is installed. To implement this search,
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you must ingest logs that contain the process GUID, process name, and parent process.
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Additionally, you must ingest complete command-line executions. These logs must
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be processed using the appropriate Splunk Technology Add-ons that are specific to
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the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
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data model. Use the Splunk Common Information Model (CIM) to normalize the field
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names and speed up the data modeling process.
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known_false_positives: Unknown, possible usage by internal red team or powershell
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commands with overlap.
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references:
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- https://attack.mitre.org/techniques/T1059/001/
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- https://github.com/PowerShellMafia/PowerSploit
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- https://github.com/PowerShellEmpire/
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- https://github.com/S3cur3Th1sSh1t/PowerSharpPack
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drilldown_searches:
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- name: View the detection results for - "$dest$" and "$user$"
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search: '%original_detection_search% | search dest = "$dest$" AND user = "$user$"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: View risk events for the last 7 days for - "$dest$" and "$user$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$","$user$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)`'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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- name: Investigate PowerShell on $dest$
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search: '| from datamodel:Endpoint.Processes | search dest=$dest|s$ process_name=$process_name$
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"*$match$*"'
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earliest_offset: $info_min_time$
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latest_offset: $info_max_time$
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rba:
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message: The user $user$ ran a known malicious PowerShell string matching *$match$*
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on $dest$
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risk_objects:
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- field: user
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type: user
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score: 70
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- field: dest
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type: system
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score: 70
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threat_objects:
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- field: process_name
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type: process_name
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tags:
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analytic_story:
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- Malicious PowerShell
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asset_type: Endpoint
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mitre_attack_id:
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- T1059.001
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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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security_domain: threat
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tests:
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- name: True Positive Test
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attack_data:
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- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1087.002/AD_discovery/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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