Re: Spike in O365 risky "unfamiliar" sign-ins?

["Sonder, Henk E." <hsonder () RIC EDU>]

Colin,

The same here. I have had over a half dozen student accounts in the last two days and they all show up in the Chegg 
breach. The geolocations are all over the place (including Russia, Philippines, Thailand, Indonesia, Greece, and Saudi 
Arabia).

Sure this will continue for a while.

Henk E. Sonder
Director Information Security
Rhode Island College
600 Mount Pleasant Ave
Providence, RI 02908
Office: 401-456-9577
Email: hsonder () ric edu

-----Original Message-----
From: The EDUCAUSE Security Community Group Listserv <SECURITY () LISTSERV EDUCAUSE EDU> On Behalf Of Turnbull, Colin
Sent: Friday, September 13, 2019 2:05 PM
To: SECURITY () LISTSERV EDUCAUSE EDU
Subject: Re: [SECURITY] Spike in O365 risky "unfamiliar" sign-ins?

Possibly unrelated but if you subscribe to the haveibeenpwned domain search, you may want to compare the accounts with 
those listed in the Chegg data breach. We're seeing a run on those accounts being tested. 
This includes the use of the MS address space with a South Korea geolocation.

Colin Turnbull
Sr Manager InfoSec Services & CISO
Information Technology
cturnbull () ewu edu | 509.359.4985

On 9/13/19 8:28 AM, Jim A. Bole wrote:
> Many thanks for the quick confirmation.
>
> We had a scary start to this Friday the 13^th .
>
> Jim
>
> *From:* The EDUCAUSE Security Community Group Listserv 
> <SECURITY () LISTSERV EDUCAUSE EDU> *On Behalf Of *Hart, Michael
> *Sent:* Friday, September 13, 2019 10:40 AM
> *To:* SECURITY () LISTSERV EDUCAUSE EDU
> *Subject:* Re: Spike in O365 risky "unfamiliar" sign-ins?
>
> Yep.  Same here.  I'm going to be working with my team to create a 
> good run book for these events.  A fair percentage need to be filtered 
> out, and we need to find a good way of determining the validity of an alert.
> As an example, I have a faculty member who showed an alert for logging 
> in from South Korea this morning.  I don't know off-hand if she's 
> travelling and this is legit, or if her account is compromised.  We'll 
> need to figure out how to do a reasonably fast investigation for these 
> events.  I obviously can't just email the individuals, as someone 
> could be intercepting the emails.
>
> If anyone has good O365 runbooks, I would appreciate a discussion.
>
> *Mike Hart  | CISO, Director of ITS Security, Infrastructure, and
> Networking*
> *Metropolitan State University of Denver Information Technology 
> Services* Campus Box 96, P.O. Box 173362, Denver, CO 80217-3362 Admin 
> Building - 1201 5^th  Street 480E  Denver, CO 80204
> 303-615-0541 (Office)
> 303-352-7548 (Help Desk)
> mhart20 () msudenver edu <mailto:mhart20 () msudenver edu> | 
> www.msudenver.edu/technology 
> <https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.
> msudenver.edu%2Ftechnology&data=02%7C01%7Cjbole%40STEVENSON.EDU%7C0651
> 2974ec10432cb19908d738585434%7C93599c7168554022bac5141d808346d1%7C0%7C
> 0%7C637039824335954433&sdata=d2H4yIBmp5vKnFj%2BW0snML4H6F%2FAwAPxO1Yr9
> 4GQMZY%3D&reserved=0>
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> University_Formal_2CPos184x
>
> *From:* The EDUCAUSE Security Community Group Listserv 
> <SECURITY () LISTSERV EDUCAUSE EDU 
> <mailto:SECURITY () LISTSERV EDUCAUSE EDU>>
> *On Behalf Of *Jim A. Bole
> *Sent:* Friday, September 13, 2019 8:25 AM
> *To:* SECURITY () LISTSERV EDUCAUSE EDU 
> <mailto:SECURITY () LISTSERV EDUCAUSE EDU>
> *Subject:* [SECURITY] Spike in O365 risky "unfamiliar" sign-ins?
>
> In the past 24 hours we saw a spike in "unfamiliar" sign-in alerts on 
> our O365 tenant.
>
> We are still investigating, but we have some indications in might be 
> due to Microsoft's recent change in their algorithm:
>
> https://techcommunity.microsoft.com/t5/Azure-Active-Directory-Identity
> /Presenting-the-new-Unfamiliar-Sign-in-Properties/ba-p/779978
> <https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftec
> hcommunity.microsoft.com%2Ft5%2FAzure-Active-Directory-Identity%2FPres
> enting-the-new-Unfamiliar-Sign-in-Properties%2Fba-p%2F779978&data=02%7
> C01%7Cjbole%40STEVENSON.EDU%7C06512974ec10432cb19908d738585434%7C93599
> c7168554022bac5141d808346d1%7C0%7C0%7C637039824335954433&sdata=07fnjQd
> 5VQ3xyITtK%2F7R8s8BMAF8kfK6%2FnjVy8mkuqI%3D&reserved=0>
>
> Is anyone else seeing this?
>
> Jim Bole
>
> Director of Information Security
>
> *Stevenson University*
>
> 1525 Greenspring Valley Road
>
> Stevenson, MD, 21153-0641
>
> jbole () stevenson edu <mailto:jbole () stevenson edu> | O: 443-334-2696
>
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