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Added detection testing service results inGsuite Email With Known Abuse Web Service Link

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2021-08-27 08:32:46 +00:00
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commit d680c232b0
1 changed files with 15 additions and 14 deletions
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detections/cloud/gsuite_email_with_known_abuse_web_service_link.yml
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@@ -5,20 +5,22 @@ date: '2021-08-23'
author: Teoderick Contreras, Splunk
type: Anomaly
datamodel: []
description: This analytics is to detect a gmail containing a link that are known to be abused by malware or attacker like pastebin, telegram and discord to deliver malicious payload.
This event can encounter some normal email traffic within organization and external email that normally using this application and services.
search: '`gsuite_gmail` "link_domain{}" IN ("*pastebin.com*", "*discord*", "*telegram*","t.me")
| 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 values(link_domain{}) as link_domains min(_time) as firstTime max(_time) as lastTime count by is_spam source.address source.from_header_address subject destination{}.address
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
description: This analytics is to detect a gmail containing a link that are known
to be abused by malware or attacker like pastebin, telegram and discord to deliver
malicious payload. This event can encounter some normal email traffic within organization
and external email that normally using this application and services.
search: '`gsuite_gmail` "link_domain{}" IN ("*pastebin.com*", "*discord*", "*telegram*","t.me")
| 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 values(link_domain{}) as link_domains
min(_time) as firstTime max(_time) as lastTime count by is_spam source.address source.from_header_address
subject destination{}.address | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`
| `gsuite_email_with_known_abuse_web_service_link_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
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 email contains this link that are known application within the organization or network can be catched by this detection.
known_false_positives: normal email contains this link that are known application
within the organization or network can be catched by this detection.
references:
- https://news.sophos.com/en-us/2021/07/22/malware-increasingly-targets-discord-for-abuse/
tags:
@@ -39,7 +41,6 @@ tags:
security_domain: endpoint
impact: 50
confidence: 50
# (impact * confidence)/100
risk_score: 25
context:
- Source:Endpoint
@@ -50,8 +51,8 @@ tags:
type: User
role:
- attacker
- name: destination{}.address
- name: destination{}.address
type: User
role:
- Victim
automated_detection_testing: passed