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https://github.com/splunk/security_content
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Michael Haag
75 lines
3.0 KiB
YAML
75 lines
3.0 KiB
YAML
name: Office Application Spawn rundll32 process
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id: 958751e4-9c5f-11eb-b103-acde48001122
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version: 3
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date: '2023-01-23'
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author: Teoderick Contreras, Splunk
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type: TTP
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datamodel:
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- Endpoint
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description: This detection was designed to identify suspicious spawned processes of known MS office
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applications due to macro or malicious code. this technique can be seen in so many malware
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like trickbot that used MS office as its weapon or attack vector to initially infect the machines.
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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
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= "winword.exe" OR Processes.parent_process_name = "excel.exe" OR Processes.parent_process_name
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= "powerpnt.exe" OR Processes.parent_process_name= "onenote.exe" OR Processes.parent_process_name = "onenotem.exe" OR Processes.parent_process_name = "onenoteviewer.exe" OR Processes.parent_process_name = "onenoteim.exe") AND `process_rundll32` by Processes.parent_process Processes.process_name
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Processes.process_id Processes.process_guid Processes.process Processes.user Processes.dest
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| `drop_dm_object_name("Processes")` | `security_content_ctime(firstTime)` |`security_content_ctime(lastTime)`
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| `office_application_spawn_rundll32_process_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: unknown
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references:
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- https://any.run/malware-trends/trickbot
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- https://any.run/report/47561b4e949041eff0a0f4693c59c81726591779fe21183ae9185b5eb6a69847/aba3722a-b373-4dae-8273-8730fb40cdbe
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- https://www.joesandbox.com/analysis/702680/0/html
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- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/trojanized-onenote-document-leads-to-formbook-malware/
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tags:
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analytic_story:
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- Spearphishing Attachments
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- Trickbot
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- IcedID
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- AgentTesla
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Execution
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/datasets/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: Office application spawning rundll32.exe on $dest$
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mitre_attack_id:
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- T1566
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- T1566.001
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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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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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- 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: 63
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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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