Solved

OSSEC Reporting Registry Changes

Posted on 2014-04-14
3
566 Views
Last Modified: 2014-04-15
I have gotten alerts for the following registry change a few nights in a row:

Integrity checksum changed for: 'HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ASP.NET_2.0.50727\Names'

Integrity checksum changed for: 'HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\hidusb\Enum'


I've ran scans using multiple tools and cannot find anything irregular.  I've also reviewed all firewall rules for the offending machines and don't see anything unusual.  These machines have no outside internet so its easy to review.

Is it normal for these registry values to change?  Are they false alarms in OSSEC?  I cant seem to find much information about them.
0
Comment
Question by:AllDaySentry
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 38

Expert Comment

by:Rich Rumble
ID: 40000595
What values is it saying changed? If it's only giving you a check-sum, then you need to write down what the values are from day to day...
C:\Users\rich>reg query HKLM\System\CurrentControlSet\Services\hidusb\Enum

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\hidusb\Enum
    Count    REG_DWORD    0x3
    NextInstance    REG_DWORD    0x3
    1    REG_SZ    USB\VID_413C&PID_2011&MI_00\7&146842b9&0&0000
    0    REG_SZ    USB\VID_413C&PID_2011&MI_01\7&146842b9&0&0001
    2    REG_SZ    USB\VID_046D&PID_C05A\6&223d6cf2&0&4

Open in new window

This could be a USB printer rebooting, a wireless mouse going to sleep etc... OSSEC can false-positive, but it typically is just very verbose.
-rich
0
 

Author Comment

by:AllDaySentry
ID: 40002539
I only have the checksums at this point.  I didnt realize this value can change every time the USB device reboots or goes to sleep.  

That would make sense why I am seeing it now.  The attached devices are probably being powered off for weekly maintenance, etc.
0
 
LVL 38

Accepted Solution

by:
Rich Rumble earned 250 total points
ID: 40002557
It never hurts to investigate, I may be wrong, but I've seen that before where a printer goes to sleep/reboots and ossec registers some change there.
-rich
0

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

It’s the first day of March, the weather is starting to warm up and the excitement of the upcoming St. Patrick’s Day holiday can be felt throughout the world.
Do you know what to look for when considering cloud computing? Should you hire someone or try to do it yourself? I'll be covering these questions and looking at the best options for you and your business.
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question