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https://github.com/splunk/security_content
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Michael Haag
86 lines
3.5 KiB
YAML
86 lines
3.5 KiB
YAML
name: Office Product Spawning CertUtil
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id: 6925fe72-a6d5-11eb-9e17-acde48001122
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version: 3
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date: '2023-01-24'
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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 detection identifies the latest behavior utilized by different
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malware families (including TA551, IcedID). This detection identifies any Windows
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Office Product spawning `certutil.exe`. In malicious instances, the command-line
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of `certutil.exe` will contain a URL to a remote destination. In addition, Threat
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Research has released a detections identifying suspicious use of `certutil.exe`.
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In this instance, we narrow our detection down to the Office suite as a parent process.
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During triage, review all file modifications. Capture and analyze any artifacts
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on disk. The Office Product, or `certutil.exe` will have reached out to a remote
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destination, capture and block the IPs or domain. Review additional parallel processes
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for further activity.
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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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IN ("winword.exe","excel.exe","powerpnt.exe","mspub.exe","visio.exe","onenote.exe","onenotem.exe","onenoteviewer.exe","onenoteim.exe") `process_certutil`
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by Processes.dest Processes.user Processes.parent_process Processes.process_name
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Processes.original_file_name Processes.process Processes.process_id Processes.parent_process_id
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| `drop_dm_object_name(Processes)` | `security_content_ctime(firstTime)`| `security_content_ctime(lastTime)`
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| `office_product_spawning_certutil_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: No false positives known. Filter as needed.
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references:
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- https://redcanary.com/threat-detection-report/threats/TA551/
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1105/T1105.md
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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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- AgentTesla
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- Trickbot
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confidence: 90
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context:
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- Source:Endpoint
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- Stage:Recon
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dataset:
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- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1566.001/macro/windows-sysmon_macros.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 parent process $parent_process_name$ will execute a suspicious child
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process $process_name$ with process id $process_id$ in host $dest$
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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: Hostname
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role:
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- Victim
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- name: process_name
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type: Process Name
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role:
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- Attacker
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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: 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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