Attacks/Breaches

7/20/2017
11:25 AM
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Microsoft Office 365 Users Targeted in Brute Force Attacks

Attackers leveraged popular cloud service platforms to conduct persistent - and stealthy - login attempts on corporate Office 365 accounts.

Enterprise Office 365 accounts, many belonging to high-level employees at Fortune 2000 companies, were hit with a brute-force attack in one of the earliest operationalized cloud-to-cloud business attacks, according to Skyhigh Networks, which began tracking the campaign early this year.

Skyhigh detected a pattern of organized attacks including more than 100,000 failed Office 365 logins from 67 IP addresses and 12 networks. Attackers tried logging in with different versions of employees' usernames, a sign they may have already possessed names and passwords but needed usernames for spearphishing campaigns or data access.

All login attempts came from instances hosted on cloud service platforms and targeted 48 businesses. The "slow-and-low" pace of attacks indicates threat actors were trying to stay under the radar; for each business, only a handful of senior employees were targeted. All those who were hit have been notified.

Read more details here.

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RyanSepe
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RyanSepe,
User Rank: Ninja
7/20/2017 | 11:25:25 PM
Password Policy
This is where password policy becomes helpful. Using a low and slow methodolgy will make it more likely to stay under the radar; but with enforced complexity, scheduled change, and lockout mechanisms it is still difficult to perform a brute force because of the time it would take to crack an account using this method.
REISEN1955
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REISEN1955,
User Rank: Ninja
7/21/2017 | 9:14:02 AM
Re: Password Policy
When I was supporting small business and home users before moving to Georgia, my recommendation (still holds true) is for users to make passwords out of HOBBIES.  All of us have unique interests that we remember well and can construct great combinations using these terms in totally unique ways.  Very secure.
Dr.T
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Dr.T,
User Rank: Ninja
7/24/2017 | 1:37:49 PM
early this year?
 

Has this happened earlier this year and we are just hearing it. That is interesting. I wonder if any success out of those attacks.
Dr.T
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Dr.T,
User Rank: Ninja
7/24/2017 | 1:39:52 PM
Re: Password Policy
"This is where password policy becomes helpful"

That is true. Number of trials and locking for example.

 
Dr.T
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Dr.T,
User Rank: Ninja
7/24/2017 | 1:41:10 PM
Re: Password Policy
"it is still difficult to perform a brute force because of the time"

That is true. Or just a complex password, it is still not easy to crack via brute force. 
Dr.T
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Dr.T,
User Rank: Ninja
7/24/2017 | 1:42:47 PM
Re: Password Policy
HOBBIES?

I never heard that. Anything in dictionary does not need any brute force, it could be cracked in seconds.
Dr.T
50%
50%
Dr.T,
User Rank: Ninja
7/24/2017 | 1:44:02 PM
Re: Password Policy
"... construct great combinations using these terms in totally unique ways"

This makes sense. They just need to use some special characters to make it complex.
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