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detections/experimental/cloud/gdrive_suspicious_file_sharing.yml

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+name: Gdrive suspicious file sharing
+id: a7131dae-34e3-11ec-a2de-acde48001122
+version: 1
+date: '2021-10-24'
+author: Rod Soto, Teoderick Contreras
+type: Hunting
+datamodel: []
+description: This search can help the detection of compromised accounts or internal users sharing potentially malicious/classified documents with users outside your organization via GSuite file sharing .
+search: '`gsuite_drive` name=change_user_access  
+| rename parameters.* as * | search email = "*@yourdomain.com" target_user != "*@yourdomain.com" 
+| stats count values(owner) as owner values(target_user) as target values(doc_type) as doc_type values(doc_title) as doc_title dc(target_user) as distinct_target by src_ip email | where distinct_target > 50 | `gdrive_suspicious_file_sharing_filter`'
+how_to_implement: Need to implement Gsuite logging targeting Google suite drive activity. In order for the search to work for your environment please update `yourdomain.com` value in the query with the domain relavant for your organization. 
+known_false_positives: This is an anomaly search, you must specify your domain in the parameters so it either filters outside domains or focus on internal domains. This search may also help investigate compromise of accounts. By looking at for example source ip addresses, document titles and abnormal number of shares and shared target users. 
+references:
+- https://www.splunk.com/en_us/blog/security/investigating-gsuite-phishing-attacks-with-splunk.html
+tags:
+  analytic_story:
+  - Spearphishing Attachments
+  - Data Exfiltration
+  dataset:
+  - []
+  kill_chain_phases:
+  - Exploitation
+  mitre_attack_id:
+  - T1566
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - src_ip
+  - parameters.owner
+  - parameters.target_user
+  - parameters.doc_title
+  - parameters.doc_type
+  security_domain: threat

detections/experimental/cloud/gsuite_suspicious_calendar_invite.yml

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+name: Gsuite suspicious calendar invite
+id: 03cdd68a-34fb-11ec-9bd3-acde48001122
+version: 1
+date: '2021-10-24'
+author: Rod Soto, Teoderick Contreras
+type: Hunting
+datamodel: []
+description: This search can help the detection of compromised accounts or internal users sending suspcious calendar invites via GSuite calendar. These invites may contain malicious links or attachments.
+search: '`gsuite_calendar` |bin span=5m _time |rename parameters.* as * |search target_calendar_id!=null email="*yourdomain.com"| stats  count values(target_calendar_id) values(event_title) values(event_guest) by email _time | where count >100| `gsuite_suspicious_calendar_invite_filter`'
+how_to_implement: In order to successfully implement this search, you need to be ingesting logs related to gsuite (gsuite:calendar:json) having the file sharing metadata like file type, source owner, destination target user, description, etc. This search can also be made more specific by selecting specific emails, subdomains timeframe, organizational units, targeted user, etc. In order for the search to work for your environment please update `yourdomain.com` value in the query with the domain relavant for your organization. 
+known_false_positives: This search will also produce normal activity statistics. Fields such as email, ip address, name, parameters.organizer_calendar_id, parameters.target_calendar_id and parameters.event_title may give away phishing intent.For more specific results use email parameter.
+references:
+- https://www.techrepublic.com/article/how-to-avoid-the-dreaded-google-calendar-malicious-invite-issue/
+- https://gcn.com/articles/2012/09/26/20-most-common-words-phishing-attacks.aspx
+tags:
+  analytic_story:
+  - Spearphishing Attachments 
+  dataset:
+  - []
+  kill_chain_phases:
+  - Exploitation
+  mitre_attack_id:
+  - T1566
+  product:
+  - Splunk Enterprise
+  - Splunk Enterprise Security
+  - Splunk Cloud
+  required_fields:
+  - _time
+  - email
+  - parameters.event_title
+  - parameters.target_calendar_id
+  - parameters.event_title
+  security_domain: threat

macros/gsuite_calendar.yml

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+definition: sourcetype=gsuite:calendar:json
+description: customer specific splunk configurations(eg- index, source, sourcetype).
+  Replace the macro definition with configurations for your Splunk Environmnent.
+name: gsuite_calendar
+