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Patrick
82 lines
3.6 KiB
YAML
82 lines
3.6 KiB
YAML
name: Office Application Drop Executable
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id: 73ce70c4-146d-11ec-9184-acde48001122
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version: 5
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date: '2024-05-14'
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author: Teoderick Contreras, Michael Haag, Splunk, TheLawsOfChaos, Github
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status: production
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type: TTP
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description: The following analytic detects Microsoft Office applications dropping
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or creating executables or scripts on a Windows OS. It leverages process creation
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and file system events from the Endpoint data model to identify Office applications
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like Word or Excel generating files with extensions such as .exe, .dll, or .ps1.
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This behavior is significant as it is often associated with spear-phishing attacks
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where malicious files are dropped to compromise the host. If confirmed malicious,
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this activity could lead to code execution, privilege escalation, or persistent
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access, posing a severe threat to the environment.
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data_source:
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- Sysmon EventID 1 AND Sysmon EventID 11
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search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
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where Processes.process_name IN ("winword.exe","excel.exe","powerpnt.exe","mspub.exe","visio.exe","wordpad.exe","wordview.exe","onenote.exe","onenotem.exe","onenoteviewer.exe","onenoteim.exe","msaccess.exe")
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by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest
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Processes.process_guid | `drop_dm_object_name(Processes)` |join process_guid, _time
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[| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
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as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_name IN ("*.exe","*.dll","*.pif","*.scr","*.js","*.vbs","*.vbe","*.ps1")
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by _time span=1h Filesystem.dest Filesystem.file_create_time Filesystem.file_name
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Filesystem.process_guid Filesystem.file_path | `drop_dm_object_name(Filesystem)`
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| fields _time dest file_create_time file_name file_path process_name process_path
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process process_guid] | dedup file_create_time | table dest, process_name, process,
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file_create_time, file_name, file_path, process_guid | `office_application_drop_executable_filter`'
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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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- 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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- FIN7
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- AgentTesla
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- CVE-2023-21716 Word RTF Heap Corruption
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- Warzone RAT
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- PlugX
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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 $file_name$ 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
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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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- process_name
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- file_name
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- process_guid
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- dest
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- user_id
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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:
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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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