Attacks/Breaches

7/20/2017
11:25 AM
50%
50%

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.

Dark Reading's Quick Hits delivers a brief synopsis and summary of the significance of breaking news events. For more information from the original source of the news item, please follow the link provided in this article. View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Oldest First  |  Newest First  |  Threaded View
RyanSepe
100%
0%
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
50%
50%
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
50%
50%
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
50%
50%
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
50%
50%
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
50%
50%
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.
WebAuthn, FIDO2 Infuse Browsers, Platforms with Strong Authentication
John Fontana, Standards & Identity Analyst, Yubico,  9/19/2018
New Cold Boot Attack Gives Hackers the Keys to PCs, Macs
Kelly Sheridan, Staff Editor, Dark Reading,  9/13/2018
Mirai Hackers' Sentence Includes No Jail Time
Dark Reading Staff 9/19/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
Flash Poll
The Risk Management Struggle
The Risk Management Struggle
The majority of organizations are struggling to implement a risk-based approach to security even though risk reduction has become the primary metric for measuring the effectiveness of enterprise security strategies. Read the report and get more details today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-17243
PUBLISHED: 2018-09-20
Global Search in Zoho ManageEngine OpManager before 12.3 123205 allows SQL Injection.
CVE-2018-17232
PUBLISHED: 2018-09-20
SQL injection vulnerability in archivebot.py in docmarionum1 Slack ArchiveBot (aka slack-archive-bot) before 2018-09-19 allows remote attackers to execute arbitrary SQL commands via the text parameter to cursor.execute().
CVE-2018-17233
PUBLISHED: 2018-09-20
A SIGFPE signal is raised in the function H5D__create_chunk_file_map_hyper() of H5Dchunk.c in the HDF HDF5 through 1.10.3 library during an attempted parse of a crafted HDF file, because of incorrect protection against division by zero. It could allow a remote denial of service attack.
CVE-2018-17234
PUBLISHED: 2018-09-20
Memory leak in the H5O__chunk_deserialize() function in H5Ocache.c in the HDF HDF5 through 1.10.3 library allows attackers to cause a denial of service (memory consumption) via a crafted HDF5 file.
CVE-2018-17235
PUBLISHED: 2018-09-20
The function mp4v2::impl::MP4Track::FinishSdtp() in mp4track.cpp in libmp4v2 2.1.0 mishandles compatibleBrand while processing a crafted mp4 file, which leads to a heap-based buffer over-read, causing denial of service.