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https://github.com/splunk/security_content
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pyth0n1c
85 lines
4.4 KiB
YAML
85 lines
4.4 KiB
YAML
name: Office Application Drop Executable
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id: 73ce70c4-146d-11ec-9184-acde48001122
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version: 10
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date: '2025-02-10'
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author: Teoderick Contreras, Michael Haag, Splunk, TheLawsOfChaos, Github
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status: deprecated
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type: TTP
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description: The following analytic has been deprecated. The following analytic detects
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Microsoft Office applications dropping or creating executables or scripts on a Windows
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OS. It leverages process creation and file system events from the Endpoint data
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model to identify Office applications like Word or Excel generating files with extensions
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such as .exe, .dll, or .ps1. This behavior is significant as it is often associated
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with spear-phishing attacks where malicious files are dropped to compromise the
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host. If confirmed malicious, this activity could lead to code execution, privilege
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escalation, or persistent 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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drilldown_searches:
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- name: View the detection results for - "$dest$"
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search: '%original_detection_search% | search dest = "$dest$"'
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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 - "$dest$"
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search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
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starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
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values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
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as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
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as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
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| `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: process $process_name$ drops a file $file_name$ in host $dest$
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risk_objects:
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- field: dest
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type: system
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score: 64
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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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- CVE-2023-21716 Word RTF Heap Corruption
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- Warzone RAT
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- FIN7
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- Compromised Windows Host
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- AgentTesla
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- PlugX
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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/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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