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xpd



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# 239298 11-Jul-2018 10:02
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User on Office 365 for email, gets spammed with 7000+ emails – the usual porn, drugs stuff.  Most went into the Junk folder. User deletes them all, then after approx. 4+ days we get requested to investigate what happened. When checking the Office 365 admin control panel and the incoming email stats, theres no sign of those 7000 emails ever hitting Office 365.  User does not have multiple accounts or anything setup, just the single O365 email account.

 

I tried a recover deleted items, and only found a single spammy email.

 

So where the hell did these emails come from, and/or why did O365 not see them in its stats as incoming email ? Any ideas or things to check ? Users systems have been checked over and virus/malware free.

 

 





XPD / Gavin / DemiseNZ

 

Server : i5-3470s @ 3.50GHz  16GB RAM  Win 10 Pro    Workstation : i5-3570K @ 3.40GHz  20GB RAM  RX580 4GB Win 10 Pro    Console : Xbox One

 

https://www.xpd.co.nz - Games, emulation, geekery, and my attempts at photography.     Now on BigPipe 100/100 and 2Talk

 

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  # 2054278 11-Jul-2018 12:32
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Wow...  that's an odd one.  SOmone could have dragged and dropped the messages into his folders (unlikely) but that doesn't explain why they aren't in the dumpster.  It's possible that Mickeysoft had a failure and then cleaned it up but that's not necessarily likely either.

 

365 Audit logs are off by default from memory and only kept for 7 days, but maybe have a look in case I'm wrong.  I think these are in the Security & Compliance area.





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  # 2054330 11-Jul-2018 13:39
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Dynamic:

 

Wow...  that's an odd one.  SOmone could have dragged and dropped the messages into his folders (unlikely) but that doesn't explain why they aren't in the dumpster.  It's possible that Mickeysoft had a failure and then cleaned it up but that's not necessarily likely either.

 

365 Audit logs are off by default from memory and only kept for 7 days, but maybe have a look in case I'm wrong.  I think these are in the Security & Compliance area.

 

 

 

 

Pretty sure they are off by default, but they are kept longer than 7 days. Looking at mine they go back several months until the day we enabled auditing.

 

 

 

If they have retention policy enabled Security & Compliance you can use eDiscovery to dump the email box out as a csv, then look for the folder "\Recoverable Items\DiscoveryHolds". Depending on the policy config you can find a copy of hard deleted emails in here.


 
 
 
 


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  # 2054333 11-Jul-2018 13:47
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If the messages were shift-deleted directly in the Junk container they wont be recoverable using recover deleted items on the deleted items container. Use MFC-Mapi (or 'dumpsteralwayson' registry key if it still works) to try and recover the deleted items in Junk. Consider a retention policy or litigation hold for more control in future. Are you using the exchange message trace function to search for them?








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  # 2054491 11-Jul-2018 18:21
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Just for confirmation, what was the mail client in use?  Was it Outlook on the Web, or the Outlook client?

 

I'll do a couple of checks in the next couple of hours, but I'm just wondering if the emails were "bcc'd" and thus not showing in the audits?

 

 


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