OSSEC is an Open Source Host-based Intrusion Detection System. It performs log analysis, file integrity checking, policy monitoring, rootkit detection, real-time alerting and active response. (from www.ossec.net)

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OSSEC won't start, Error: queue not accessible

I'm trying to set up OSSEC on a CemtOS 6.5 server. This is to be installed as an agent, not a server or local instance. The package successfully installed and I created the clients.key file, but when ...
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60 views

OSSEC - Multiple VM's on a single DELL blade (XenServer Hypervisor)

I have a DELL blade with ~100 VM's (with a Citrix XenServer 6.1 hypervisor), all with ossec agent connected to a ossec server outside that same blade. I have a bit of a problem: they all run rootkit ...
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40 views

Is there a better way of handling ossec-logcollector?

I have been working to integrate application logs with the ossec logcollector. I have successfully created, decoded, command, rules etc, and everything works and fires triggers. However our ...
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175 views

Deploying Ossec HIDS Windows Agent via GPO

I am trying to deploy OSSEC agent to about 100 Windows 7 boxes through GPO on our AD. I understand that I need to create and MSI from the EXE and import the specific client.keys file for the windows ...
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55 views

OSSEC fails to apply Decoder Rule

I am trying to create some decoders for my watchguard log entries. However, even though my regex is correct, which even OSSEC-Regex agrees, it fails to apply the decoder. My decoders look like this: ...
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28 views

How to filter errors 404 to show only those which are related to php files?

One of my web servers is getting flooded with requests to resources that do not exist anymore, generating the corresponding 404 error. As I'm using OSSEC and OSSIM, then these errors are sent to the ...
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26 views

Hide directory, processes and user with grsecurity?

I am very new to grsecurity and getting very lost with the RBAC documentation I can find. I have just compiled a 3.2.x kernel with the grsecurity patch and have installed gradm. My objective is to ...
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90 views

Using OSSEC HIPS alongside rsyslog, overkill?

I have been tasked to harden our company linux servers. One of the problems that was outlined was the fact that logs are stored on the server which poses two problems: Difficult to aggregate and ...
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68 views

OSSec not working on server with multiple IPS

I had to add another IP address to our server (eth0:1 192.168.0.100) and all of the sudden ossec client stopped working. On the client side I'm seeing this: 2014/02/19 02:31:28 ossec-agentd: INFO: ...
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56 views

ossec prelude integration: ossec master on each prelude agent?

I am trying to integrate ossec 2.7.1 into prelude (prelude-manager 1.0.2). I registered the ossec master as a prelude agent witht the prelude master (ossec and prelude master both on the same host). ...
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102 views

ossec 2.7.1 won't update on servers

I'm trying to update ossec machines setup as servers from 2.6 and 2.7 to 2.7.1. I download the ossec-hids-2.7.1.tar.gz, extract it, and run the ./install.sh. It recognizes there's a previous ...
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422 views

Suppress OSSEC email for failed root ssh

I'm running OSSEC as a HIDS on a Ubuntu 12.10 server, and it routinely (3-4x a day) sends me a notification like this: (note the last octet of the IP address has been changed to 'xxx' to protect the ...
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147 views

OSSEC as a SIEM

I am working on a log aggregation project and wanted to add some minor correlations/security intelligence to the mix. Currently I have logs from ~400 servers coming into a syslog-ng box. I was looking ...
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398 views

Simple application level file integrity monitoring & Intrusion detection (IDS)

We've been searching for a simple file integrity monitoring solution on CentOS/Linux that will work on the application level. We are not looking for OS/network level IDS as OSSEC and the others do a ...
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388 views

OSSEC “unable to retrieve alerts”

I try to learn about Ossec, but, when i access to the Ossec web UI in the Main tab, Ossec shows me: "unable to retrieve alerts" I see the alerts.log file and i can read different problems. Why i ...
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337 views

how does OSSEC agent detects signature/alerts?

Can someone explain how does ossec agent in an active response config detects or responds to events (e.g scan attempt on web-server 404 status code). I know that the below xml block at the server ...
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518 views

Ossec tests and verification

I have just installed OSSec accordingly as the server. When it asked for my email I put in my GMail address and for the SMTP I was not sure so I just set it as localhost first. Then it runs a number ...
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740 views

Generating alerts from ossec ( server- agent ) model

I'm very new to OSSEC. I use a server-agent model. I wish to generate alert for the following actions ( in agent side ): 1) Sample Alert for delation of logs I added the rules for these in agent's ...
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728 views

OSSEC is not running

I have an two ec2 instances. In one I have installed ossec server and in other I have installed ossec agent. Here are my server config INBOUND (security group/firewall) : port:514 ...
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105 views

Email sending script from address is invalid

i am sending email notifications from OSSEC active response script firewall-drop.sh, but when the email is sent through it, the FROM address is like this -@mydomain.com it should be ...
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1answer
252 views

What is the purpose of filtering egressing traffic (CSF)?

For a while now I am using CSF as main firewall with LFD, and OSSEC as main IDS. (I like OSSEC over the overreacting builtin IDS of CSF). I tested it for small DoS attacks such a slowloris variants ...
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1answer
425 views

OSSEC agent behind NAT

I am working on an OSSEC deployment where I will have multiple agents behind 1 public IP. Below is an example of the setup Private Network OSSEC-Agent1 (192.168.1.10) OSSEC-Agent2 ...
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2k views

OSSEC large scale deployment

We have a data-center and as a happy OSSEC user I am trying to convince my management to use it for host intrusion detection. However I have never deployed it on more than a handful of servers and I ...
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144 views

Ossec fields to Oracle DB

I would like some recommendations for the following problem. I use Ossec for log analysis. What I want, is after extracting the fields to save them in an Oracle database. For example, if I have this ...
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386 views

ossec email alerts

Just installed ossec and sendmail however can't able to get alerts to my gmail from ossec. I am able to see the alerts on the sendmail localhost, however alerts seem to be not forwarding to gmail.
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1k views

OSSEC: Unblock an IP and increase tresshold

I just set up OSSEC, but I accidentally shut myself out already from my home ip. So does OSSEC have a function to unblock an IP after it is blocked or do I need to do this manually in iptables ? ...
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257 views

What dangers (and should I be worried) are there from attempted break-ins? (reported by OSSEC)

I've installed OSSEC on my server and I've been getting reports similar to the following: Jan 11 19:27:03 Daddy sshd[14459]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 ...
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419 views

Where can I find information about inbuilt registry keys for Windows Server 2008 R2?

Is there a resource for looking up the description and/or usage of W2K8 R2 registry keys? I need to understand integrity checksum change messages appearing in OSSEC logs on Amazon EC2 instances. ...
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1k views

Do I need at least 1 Linux server to use OSSEC to monitor my Windows servers?

I don't know why this isn't more plainly obvious on the website: http://www.ossec.net/ But I can't tell if I need to install a 'server' portion on Linux and then an 'agent' on Windows and then ...
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738 views

OSSEC HIDS Notification emails every five minutes from server

My server is sending me the below error message to my email every five minutes: OSSEC HIDS Notification. 2011 Jun 17 16:30:03 Received From: ubuntu->/var/log/syslog Rule: 1002 fired ...
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1answer
634 views

Just installed OSSEC, what next?

We need file integrity monitoring on our windows servers (a webserver and a database server) and before we drop money on Tripwire, I'm checking out OSSEC. I installed a local installation to test with ...
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425 views

Use OSSEC active response behind load balancer

We have OSSEC installed on some web servers running behind Amazon ELB. The problem is that when the active response triggers it blocks the IP address of the load balancer. Is there any way to use the ...
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115 views

PID ran away with all our MEM and SWAPPED hard - OSSEC RHEL

Forgive me for the length of this question... it is mostly details... only attempt to follow if you also enjoy reading log files... or drinking coffee. I'll state the questions first: 1) how the ...
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2k views

OSSEC integrity checksum alert - what caused the change?

Recently installed OSSEC on Linux machine to test. Most results are expected, however yesterday I received emails with a number of notifications about Integrity checksum changing on files such as ...
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361 views

HOw to know if files md5 chnaged by virus or system itself centos

I installed OSSSEC to very files have chnaged or not. But sometimes it is giving me false waring and integrity checksums like following files have chnaged. How can i makesure that files are chnaged ...
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103 views

HOw to view all Logs in OSSSEC system ubuntu

I have installed OSSEC It is working and sometime sending me alert email as well. But i want to see what can i type so that i can get view all the logs of what OSSEC has found in my system
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700 views

CAn not open port 1514 in ubuntu iptables

I am installing OSSEC and it says that i need to open port 1514 and 514 in firewall. Now i have added the rule for port 1514 but i still can't get coonect if i use telney like ossec-hids-2.5]# ...