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https://github.com/splunk/security_content
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Eric
89 lines
4.2 KiB
YAML
89 lines
4.2 KiB
YAML
name: Winword Spawning Cmd
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id: 6fcbaedc-a37b-11eb-956b-acde48001122
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version: 8
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date: '2025-02-10'
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author: Michael Haag, Splunk
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status: removed
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type: TTP
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description: The following analytic has been deprecated in favour of a more generic
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approach in "Windows Office Product Spawned Uncommon Process". The following analytic
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identifies instances where Microsoft Word (winword.exe) spawns the command prompt
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(cmd.exe). This behavior is detected using Endpoint Detection and Response (EDR)
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telemetry, focusing on process creation events where the parent process is winword.exe.
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This activity is significant because it is uncommon and often associated with spearphishing
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attacks, where malicious attachments execute commands via cmd.exe. If confirmed
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malicious, this could allow an attacker to execute arbitrary commands, potentially
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leading to further system compromise, data exfiltration, or lateral movement within
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the network.
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data_source:
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- Sysmon EventID 1
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- Windows Event Log Security 4688
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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 Processes.parent_process_name=winword.exe
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`process_cmd` by Processes.dest Processes.user Processes.parent_process_name Processes.parent_process
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Processes.original_file_name Processes.process_name Processes.process Processes.process_id
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Processes.parent_process_id | `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`
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| `security_content_ctime(lastTime)` | `winword_spawning_cmd_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: False positives should be limited, but if any are present,
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filter as needed.
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references:
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- https://app.any.run/tasks/73af0064-a785-4c0a-ab0d-cde593fe16ef/
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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 = "$dest$" 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 ("$dest$",
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"$user$") starthoursago=168 | stats count min(_time) as firstTime max(_time)
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as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk
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Message" values(analyticstories) as "Analytic Stories" values(annotations._all)
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as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics"
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by normalized_risk_object | `security_content_ctime(firstTime)` | `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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rba:
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message: '$parent_process_name$ on $dest$ by $user$ launched command: $process_name$
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which is very common in spearphishing attacks.'
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risk_objects:
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- field: dest
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type: system
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score: 70
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- field: user
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type: user
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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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- Spearphishing Attachments
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- Compromised Windows Host
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- CVE-2023-21716 Word RTF Heap Corruption
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- DarkCrystal RAT
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asset_type: Endpoint
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mitre_attack_id:
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- T1566.001
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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: endpoint
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tests:
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- name: True Positive Test
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attack_data:
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- data:
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https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: XmlWinEventLog
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