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P4T12ICK
68 lines
2.2 KiB
YAML
68 lines
2.2 KiB
YAML
name: Office Application Drop Executable
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id: 73ce70c4-146d-11ec-9184-acde48001122
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version: 1
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date: '2021-09-13'
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author: Teoderick Contreras, Michael Haag Splunk
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status: production
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type: TTP
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description: This search is to detect a suspicious MS office application that drops
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or creates executables or scripts in a Windows Operating System. This behavior is
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commonly seen in spear phishing office attachment where it drop malicious files
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or script to compromised the host. It might be some normal macro may drop script
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or tools as part of automation but still this behavior is reallly suspicious and
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not commonly seen in normal office application
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data_source:
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- Sysmon Event ID 1
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search:
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selection1:
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Image|endswith:
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- winword.exe
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- excel.exe
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- powerpnt.exe
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- mspub.exe
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- visio.exe
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- wordpad.exe
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- wordview.exe
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condition: selection1
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how_to_implement: To successfully implement this search, you need to be ingesting
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logs with the process name, parent process, and command-line executions from your
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endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
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Sysmon TA. Tune and filter known instances where renamed rundll32.exe may be used.
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known_false_positives: office macro for automation may do this behavior
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references:
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- https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation
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- https://attack.mitre.org/groups/G0046/
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- https://www.joesandbox.com/analysis/702680/0/html
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tags:
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analytic_story:
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- FIN7
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- AgentTesla
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asset_type: Endpoint
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confidence: 80
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impact: 80
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message: process $process_name$ drops a file $TargetFilename$ 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: Computer
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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
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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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risk_score: 64
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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: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/fin7/fin7_macro_js_1/sysmon.log
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source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
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sourcetype: xmlwineventlog
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