mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Bhavin Patel
83 lines
3.6 KiB
YAML
83 lines
3.6 KiB
YAML
name: Office Application Drop Executable
|
|
id: 73ce70c4-146d-11ec-9184-acde48001122
|
|
version: 5
|
|
date: '2024-05-14'
|
|
author: Teoderick Contreras, Michael Haag, Splunk, TheLawsOfChaos, Github
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic detects Microsoft Office applications dropping
|
|
or creating executables or scripts on a Windows OS. It leverages process creation
|
|
and file system events from the Endpoint data model to identify Office applications
|
|
like Word or Excel generating files with extensions such as .exe, .dll, or .ps1.
|
|
This behavior is significant as it is often associated with spear-phishing attacks
|
|
where malicious files are dropped to compromise the host. If confirmed malicious,
|
|
this activity could lead to code execution, privilege escalation, or persistent
|
|
access, posing a severe threat to the environment.
|
|
data_source:
|
|
- Sysmon EventID 1
|
|
- Sysmon EventID 11
|
|
search: '| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes
|
|
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")
|
|
by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest
|
|
Processes.process_guid | `drop_dm_object_name(Processes)` |join process_guid, _time
|
|
[| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime FROM datamodel=Endpoint.Filesystem where Filesystem.file_name IN ("*.exe","*.dll","*.pif","*.scr","*.js","*.vbs","*.vbe","*.ps1")
|
|
by _time span=1h Filesystem.dest Filesystem.file_create_time Filesystem.file_name
|
|
Filesystem.process_guid Filesystem.file_path | `drop_dm_object_name(Filesystem)`
|
|
| fields _time dest file_create_time file_name file_path process_name process_path
|
|
process process_guid] | dedup file_create_time | table dest, process_name, process,
|
|
file_create_time, file_name, file_path, process_guid | `office_application_drop_executable_filter`'
|
|
how_to_implement: To successfully implement this search, you need to be ingesting
|
|
logs with the process name, parent process, and command-line executions from your
|
|
endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the
|
|
Sysmon TA. Tune and filter known instances where renamed rundll32.exe may be used.
|
|
known_false_positives: office macro for automation may do this behavior
|
|
references:
|
|
- https://www.mandiant.com/resources/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation
|
|
- https://attack.mitre.org/groups/G0046/
|
|
- https://www.joesandbox.com/analysis/702680/0/html
|
|
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/trojanized-onenote-document-leads-to-formbook-malware/
|
|
tags:
|
|
analytic_story:
|
|
- FIN7
|
|
- AgentTesla
|
|
- CVE-2023-21716 Word RTF Heap Corruption
|
|
- Warzone RAT
|
|
- PlugX
|
|
asset_type: Endpoint
|
|
confidence: 80
|
|
impact: 80
|
|
message: process $process_name$ drops a file $file_name$ in host $dest$
|
|
mitre_attack_id:
|
|
- T1566
|
|
- T1566.001
|
|
observable:
|
|
- name: dest
|
|
type: Hostname
|
|
role:
|
|
- Victim
|
|
- name: process_name
|
|
type: Process
|
|
role:
|
|
- Attacker
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
required_fields:
|
|
- _time
|
|
- process_name
|
|
- file_name
|
|
- process_guid
|
|
- dest
|
|
- user_id
|
|
risk_score: 64
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data:
|
|
https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/fin7/fin7_macro_js_1/sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: xmlwineventlog
|