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Update o365_email_hard_delete_excessive_volume.yml

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Steven Dick
2025-01-31 15:15:55 -05:00
committed by GitHub
parent ef906974fd
commit e43b248cde
1 changed files with 2 additions and 1 deletions
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detections/cloud/o365_email_hard_delete_excessive_volume.yml
+2 -1
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@@ -9,7 +9,8 @@ description: The following analytic identifies when an O365 email account hard d
data_source:
- Office 365 Universal Audit Log
search: '`o365_management_activity` Workload=Exchange (Operation IN ("HardDelete") AND Folder.Path IN ("\\Sent Items","\\Recoverable Items\\Deletions"))
| eval user = lower(UserId), sender = lower(CASE(isnotnull(SendAsUserSmtp),SendAsUserSmtp,isnotnull(SendOnBehalfOfUserSmtp),SendOnBehalfOfUserSmtp,true(),MailboxOwnerUPN)), subject = trim(CASE(Operation IN ("Send","SendAs","SendOnBehalf"),'Item.Subject',Operation IN ("SoftDelete","HardDelete"),'AffectedItems{}.Subject')), -time = _time,file_name = CASE(Operation IN ("Send","SendAs","SendOnBehalf"),split('Item.Attachments',"; "),Operation IN ("SoftDelete","HardDelete"),split('AffectedItems{}.Attachments',"; ")), file_size = CASE(Operation IN ("Send","SendAs","SendOnBehalf"),round(tonumber('Item.SizeInBytes')/1024/1024,2),true(),round(tonumber(replace(file_name, "(.+)\s\((\d+)(b\)$)", "\2"))/1024/1024,2))
| rename AffectedItems{}.* as AffectedItems_*, Item.* as Item_*
| eval user = lower(UserId), sender = lower(CASE(isnotnull(SendAsUserSmtp),SendAsUserSmtp,isnotnull(SendOnBehalfOfUserSmtp),SendOnBehalfOfUserSmtp,true(),MailboxOwnerUPN)), subject = trim(CASE(Operation IN ("Send","SendAs","SendOnBehalf"),Item_Subject,Operation IN ("SoftDelete","HardDelete"),AffectedItems_Subject)), -time = _time,file_name = CASE(Operation IN ("Send","SendAs","SendOnBehalf"),split(Item_Attachments,"; "),Operation IN ("SoftDelete","HardDelete"),split(AffectedItems_Attachments,"; ")), file_size = CASE(Operation IN ("Send","SendAs","SendOnBehalf"),round(tonumber(Item_SizeInBytes)/1024/1024,2),true(),round(tonumber(replace(file_name, "(.+)\s\((\d+)(b\)$)", "\2"))/1024/1024,2))
| bin _time span=1hr
| stats values(sender) as sender, values(ClientIPAddress) as src, values(ClientInfoString) as http_user_agent, values(Operation) as signature, latest(file_name) as file_name, sum(file_size) as file_size, values(Folder.Path) as file_path, min(-time) as firstTime, max(-time) as lastTime, dc(subject) as count by _time,user
| where count > 50 OR file_size > 10