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61 lines
2.4 KiB
YAML
61 lines
2.4 KiB
YAML
name: Detect Prohibited Applications Spawning cmd exe
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id: c10a18cb-fd80-4ffa-a844-25026e0a0c94
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version: 1
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date: 2020-7-13
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author: Ignacio Bermudez Corrales, Splunk
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type: streaming
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datamodel: []
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description: This search looks for executions of cmd.exe spawned by a process that
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is often abused by attackers and that does not typically launch cmd.exe. This is
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a SPL2 implementation of the rule `Detect Prohibited Applications Spawning cmd.exe`
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by @bpatel.
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search: '| from read_ssa_enriched_events()
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| eval timestamp=parse_long(ucast(map_get(input_event, "_time"), "string", null))
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| eval process_name=ucast(map_get(input_event, "process_name"), "string", null),
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parent_process=lower(ucast(map_get(input_event, "parent_process_name"), "string",
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null)), dest_user_id=ucast(map_get(input_event, "dest_user_id"), "string", null),
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dest_device_id=ucast(map_get(input_event, "dest_device_id"), "string", null), event_id=ucast(map_get(input_event,
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"event_id"), "string", null)
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| where process_name="cmd.exe" | rex field=parent_process "(?<field0>[^\\\\]+)$"
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| where field0="winword.exe" OR field0="excel.exe" OR field0="outlook.exe" OR field0="powerpnt.exe"
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OR field0="visio.exe" OR field0="mspub.exe" OR field0="acrobat.exe" OR field0="acrord32.exe"
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OR field0="chrome.exe" OR field0="iexplore.exe" OR field0="opera.exe" OR field0="firefox.exe"
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OR field0="java.exe" OR field0="powershell.exe"
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| eval start_time=timestamp, end_time=timestamp, entities=mvappend(dest_device_id,
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dest_user_id), body=create_map(["event_id", event_id, "process_name", process_name,
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"parent_process_name", parent_process]) | into write_ssa_detected_events();'
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how_to_implement: You must be ingesting sysmon logs. This search has been modified
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to process raw sysmon data from attack_range's nxlogs on DSP.
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known_false_positives: There are circumstances where an application may legitimately
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execute and interact with the Windows command-line interface. Investigate and modify
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the lookup file, as appropriate.
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references: []
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tags:
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analytic_story:
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- Suspicious Command-Line Executions
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- Suspicious MSHTA Activity
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- Suspicious Zoom Child Processes
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- Sunburst Malware
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cis20:
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- CIS 8
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kill_chain_phases:
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- Exploitation
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mitre_attack_id:
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- T1059
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nist:
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- PR.PT
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- DE.CM
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product:
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- Splunk Behavioral Analytics
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required_fields:
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- process_name
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- parent_process_name
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- _time
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- dest_device_id
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- dest_user_id
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risk_severity: low
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security_domain: endpoint
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