From e43b248cde6340ba2d58dfbc605e841d8b23a256 Mon Sep 17 00:00:00 2001
From: Steven Dick <38897662+nterl0k@users.noreply.github.com>
Date: Fri, 31 Jan 2025 15:15:55 -0500
Subject: [PATCH] Update o365_email_hard_delete_excessive_volume.yml

---
 detections/cloud/o365_email_hard_delete_excessive_volume.yml | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/detections/cloud/o365_email_hard_delete_excessive_volume.yml b/detections/cloud/o365_email_hard_delete_excessive_volume.yml
index 6344fda67d..9c0f857a8d 100644
--- a/detections/cloud/o365_email_hard_delete_excessive_volume.yml
+++ b/detections/cloud/o365_email_hard_delete_excessive_volume.yml
@@ -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