Delete gsuite_email_suspicious_subject_with_attachment.yml

detections/endpoint/gsuite_email_suspicious_subject_with_attachment.yml

@@ -1,67 +0,0 @@
-name: Gsuite Email Suspicious Subject With Attachment
-id: 8ef3971e-00f2-11ec-b54f-acde48001122
-version: 1
-date: '2021-08-19'
-author: Teoderick Contreras, Splunk
-type: Anomaly
-datamodel:
-- Endpoint
-- Email
-- Updates
-description: This search is to detect a gsuite email contains suspicious subject having known file type used in spear phishing.
-  This technique is a common and effective entry vector of attacker to compromise a network by luring the user to click or execute the suspicious attachment 
-  send from external email account because of the effective social engineering of subject related to delivery, bank and so on.
-  On the other hand this detection may catch a normal email traffic related to legitimate transaction so better to check the email sender, spelling and etc.
-  avoid click link or opening the attachment if you are not expecting this type of e-mail. 
-search: '`gsuite_gmail` num_message_attachments > 0  
-  subject IN ("*dhl*", "* ups *”, “*delivery*”, “*parcel*”, “*label*”, “*invoice*”, “*postal*”, “* fedex *”, “* usps *”, “* express *”, “*shipment*”, “*Banking/Tax*”,”*shipment*”, “*new order*”) 
-  attachment{}.file_extension_type IN ("doc", "docx", "xls", "xlsx", "ppt", "pptx", "pdf", "zip", "rar”, “html”,”htm”,”hta”) 
-  | rex field=source.from_header_address "[^@]+@(?<source_domain>[^@]+)"  
-  | rex field=destination{}.address "[^@]+@(?<dest_domain>[^@]+)"  
-  | where not source_domain="internal_test_email.com" and dest_domain="internal_test_email.com" 
-  | stats count min(_time) as firstTime max(_time) as lastTime values(attachment{}.file_extension_type) as email_attachments, values(attachment{}.sha256) as attachment_sha256, values(payload_size) as payload_size by   
-  destination{}.service num_message_attachments  subject destination{}.address source.address
-  | `security_content_ctime(firstTime)`
-  | `security_content_ctime(lastTime)` 
-  | `gsuite_email_suspicious_subject_with_attachment_filter`'
-how_to_implement: To successfully implement this search, you need to be ingesting
-  logs related to gsuite having the file attachment metadata like file type, file 
-  extension, source email, destination email, num of attachment and etc.
-known_false_positives: normal user or normal transaction may contain the subject and file type attachment that 
-  this detection try to search.
-references:
-- https://www.redhat.com/en/topics/devops/what-is-devsecops
-- https://www.fireeye.com/content/dam/fireeye-www/global/en/current-threats/pdfs/rpt-top-spear-phishing-words.pdf
-tags:
-  analytic_story:
-  - DevSecOps
-  dataset:
-  - https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/t1566.001/gsuite_susp_subj/gsuite_susp_subj_attach.log
-  kill_chain_phases:
-  - Exploitation
-  mitre_attack_id:
-  - T1566.001
-  product:
-  - Splunk Enterprise
-  - Splunk Enterprise Security
-  - Splunk Cloud
-  required_fields:
-  - _time
-  security_domain: endpoint
-  impact: 50
-  confidence: 50
-  # (impact * confidence)/100
-  risk_score: 25
-  context:
-  - Source:Endpoint
-  - Stage:Reconnaissance
-  message: suspicious email from $source.address$ to $destination{}.address$
-  observable:
-  - name: source.address
-    type: User
-    role:
-    - attacker
-  - name: destination{}.address 
-    type: User
-    role:
-    - Victim