Intrusion Detection System, a system for detecting and alerting based on behavior.

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Tracing The Source Of IDS/IPS Alerts

This may be more of a routing question than a security one but I am asking for the reason of security. I monitor an IPS on a remote network and there have been high alerts triggered recently that ...
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2answers
35 views

Distinction of DPI and IDS

I'm currently reading about Intrusion Detection Systems (IDS) and noticed a huge variety of definitions for the term of Deep Packet Inspection. Especially the NIST shows three different techniques in ...
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1answer
43 views

Nil events in IPS reports today [closed]

The IPS reports have one or two events minimum every day so far. But today there were no events, both in DC1 and DC2 reports. I am wondering if this possible? How come on a particular day nobody ...
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35 views

Call For papers format help [closed]

I’m intending to submit a personal project for a “call for papers” for an upcoming Con. I have a really interesting topic that I wanted to submit for the talk. I was hoping to gain some feed back on ...
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531 views

High-Risk Intrusion Detected

I have an endpoint protection from Symantec. Recently, I have been receiving many Symantec Cloud Alert emails. wp-admin/admin-ajax.php?action=revslider_show_image&img=../wp-config.php They ...
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3answers
239 views

IDS in combination with vulnerability scanner

I'm planning to set up a server environment with high security requirements on which i want to install an intrusion detection system (snort). Additionally, I think of running a vulnerability scanner ...
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2answers
537 views

Questions on IDS, IPS, VLANs and VPN [closed]

I have a network that has a single point of entry the WAN. The WAN exposes about 10 static IP's that resolve internally to servers that are in the same subnet. Meaning that if you RDP over 3389 to ...
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1answer
185 views

Intrusion Detection System and Network Intrusion Detection Systems [duplicate]

IDS (Intrusion Detection System), NIDS (Network Intrusion Detection System) What's the difference between IDS and NIDS? Can i use more than one IDS and NIDS at the same time? Or both IDS and NIDS ...
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2answers
289 views

How to make sense of, and act on, Snort Rules?

I am a relatively new Snort user with years of sys admin experience. I feel that I must be missing something, because I find Snort rules to be completely undocumented and incomprehensible. Because of ...
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70 views

Server Security Through Constant Check-ins [closed]

I've built a system and have put a ton of work into making sure is super secure. But I have a (potentially irrational) fear that if someone were able to break into my server, they could just change ...
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62 views

Is it possible to detect IDS name and version

the title said it. Is it possible to detect IDS name and version. If server use Snort as IDS, would I be able to detect it from external PC? And if it's possible how?
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302 views

Cryptic threat names

I have logs from a security appliance from Damballa which has cryptic names for threats observed in a network which I am trying to make sense of. Some examples of these threats are "RedTreeBruisers" , ...
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335 views

IDS false positive rates

Are there any industry accepted standards for the false positive rates for a Network IDS based on Snort? Is there a way to check the false positive rates in a deployed IDS? (ideally without looking at ...
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87 views

How to specify a Snort rule connection duration?

Is it even possible to specify into a snort rule the duration of a connection? For example: in this format Hour, Minute, Second H, M, S = 0, 2, 1 If a connection that has the duration of 2 minutes ...
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1answer
556 views

Network anomaly detection or anomaly-based intrusion detection?

When implementing anomaly-based intrusion detection system, if I want to dismiss U2R and R2L attacks (to avoid deep packet inspection), and to consider only Probe and DoS attacks, what features should ...
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1answer
339 views

Why unsupervised anomaly-based intrustion detection training data should be normal or less noisy

I recently read a paper which stated that "Traditional anomaly detection algorithms require a set of purely normal data from which they train their model" [1]. But as in K-means, or other unsupervised ...
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35 views

Do I need ossec for my personal home computer? [closed]

Do I really need a HIDS like ossec, or will using good passwords, using a firewall, an antivirus/antimalware program, and a rootkit scanner do the job well enough?
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63 views

Suricata rule to block particular website question

I am writing rule for suricata which is going to block the possibility to enter one of the website for example xyz.com (instead of facebook, because with facebook there are some problems). I am doing ...
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46 views

fwsnort - How safe compared with Snort/Suricata

How safe is 'fwsnort' compared to a real Snort / Suricata instance? Whats the percentage of VRT / ET Rules, that fwsnort can actually use? I read somewhere from an older article its only ~ 60% - is ...
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51 views

Windows SQL Server Intrusion Detection [closed]

I'm looking into Snort to carry our basic intrusion detection, but finding it hard going. What other Intrusion Detection software is there that is good to use for SQL Server?
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154 views

Snort - Rule: Alert all php requests

I am trying to understand writing rules for snort. Further goal is detection of sql injections like here. I've read the documentation of snort rules and created this rule: alert tcp any any -> ...
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2answers
1k views

NIDS/NIPS vs HIDS/HIPS

Can we interchangeably deploy a HIDS or HIPS instead of a NIDS/NIPS, what would be the risks, for example you have Symanetec EPS modules with HIPS policies enabled how are they different from a ...
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91 views

Why does IBM's Intrusion Detection System Show Local IPs instead of Public IPs for the Source of an Attack?

Security Intern here given the assignment to find the IP address of an attacker using IBM's IDS. The event or attack in question is entitled X509_Weak_Signature_Algorithm, and from what I ...
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341 views

Snort Rule Comparison

As far as I read, Emerging threats and VRT Snort rules are available freely, and also Pro (fee based). Is there any comparision, or anything to suggest choose one over another? What are the benefits ...
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148 views

HIDS that can detect attacks, take immediate action locally, and then report to a central service for re-broadcasting to other systems?

I've been researching this for a bit now and cannot find what I want. So I'm to the point where I'm weighing my options as to how I can proceed. Background I'd like to setup a HIDS that has the ...
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87 views

Can Sagan block active acts once they've been detected?

I'm trying to determine if Sagan can do anything similar to fail2ban where detected attacks can be temporarily blacklisted, via a system's firewall (iptables). Does Sagan have any "countermeasures" or ...
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228 views

How to detect suspicious activity on a web and mailserver?

There is a OpenBSD (64bit; 5.5) server having nginx (HTTP/HTTPS) and SMTP (OpenSMTP). Question: What are the best practices to detect suspicious activity? Are there any scripts that shows ...
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376 views

How can I test a DoS attack against snort?

I need to set up an scenario where an attacker DoS attacks port 80 of an server while snort and others users try to connect to port 80 at the same time. Something like this: 1000 connections to port ...
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2answers
81 views

Attack Signatures books [closed]

I have an assignment to do for school which involves attack signatures (I have to do a service-specific IDS). Basically what I have to do is to generate signatures for some attacks with Metasploit on ...
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52 views

Industry standards for threat names

One of the security appliances we own reports a so-called "Industry Name" for the threats it detects on the network. I wanted to know if there is really such a standard and where I can find ...
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128 views

Intrusion Detection and Prevention technologies [closed]

I'm supposed to do a research paper on a recent technology and I thought of doing it on a technology in information security. I found interest on Intrusion detection and prevention systems (IDPS) but ...
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1answer
325 views

How does an IDS system use PCAP to process malicious signatures?

I have been wondering exactly how does an IDS system use packet captures (PCAP) to process and alert of malicious signatures?
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902 views

Interpreting Snort's stream5 alerts

I am using snort on a mirrored switchport. We have a lot of apple devices that are downloading mp3s directly from a directory index. Snort is showing me a huge amount of, in particular, these two ...
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130 views

Is there a Snort rule that equates to “something suspicious flagged from a client side application?”

The reasoning is what if an enterprise monitors snort alerts more-so than say syslog. Is there a specific pre-defined alert for 'client side app says something fishy is going on'?
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502 views

Rules for log analysis in an IDS

I am working on an IDS which has brought into the view of log analysis basically. I have to detect an intruder if there are any user behaviour anomalies present in the logs. I am having problems ...
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12 views

(spp_sdf) SDF Combination Alerts in Snort

I'm testing Snort in IDS mode and have been receiving a few (spp_sdf) SDF Combination Alerts as below. Seems like it happens when I visit certain but not all https sites. Tried to google this alert ...
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43 views

snort rule to detect relay attempt not working

I am trying to detect a relay attempt on smtp server, but nothing gets logs when I test it out. The snort rule to detect a relay attempt which I tried using is: alert tcp $SMTP_SERVERS 25 -> ...
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18 views

Snort matching against single packets

For a specific task, I'd like to match snort rules against the first 1-2 packets of each flow in the network without waiting for the other subsequent flow packets. Can I do this with snort? If so, ...
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47 views

Suricata IPS manual blocking/unblocking vs. snort and guardian

Does anyone have experience with using Suricata as an IPS? Im on Debian and I'd like to be able to manually block and unblock specific ip addresses (iptables). I've not used Suricata as I am currently ...
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18 views

Current Decryption Support for TLS [duplicate]

I've been locking things at clients down recently and ran into a side effect I hadn't really thought about were TLS traffic using DHE based ciphers can't be decrypted with SSLDump or Wireshark. I ...
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26 views

Snort arpspoof preprocessor not giving alerts

I'm attempting to use Snort to detect a simple arpspoof attack on a test network I've set up. I have the following 4 ip addresses on this network. 192.168.1.1 Router 00:18:39:EC:F5:78 192.168.1.2 ...
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32 views

Snort rule to detect More Fragments fragbit not working

I have a Virtualbox setup with Snort running on a Windows 7 host and Kali Linux as the attacking machine, connected on an internal network. I'm investigating ways to get Snort to detect fragmentation ...
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45 views

Is EasyIDS obsolete?

I have found EasyIDS from Skynet Development recently but noticed that the latest change-log is from 2009. Does this mean it is obsolete and should not be used as it is not being kept up-to date?
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31 views

Switching from Snort rules to Emerging Threats. Is there a way to know which ET rule sid covers the same vulnerabilty as Snort rule sid?

Our company has been using the snort community rules and we have tuned our rule files over years to our specific needs. Now our company has decided to use Emerging Threats (ET) open rules. The ET ...
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26 views

Security Data Analytics - Classical Measurements/Metrics

for my new Job I have to prepare information about how Security Data Analysis is actually use in practice. So my question is if someone can provide me with measurements/metrics/queries (don't really ...
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2answers
90 views

Security devices other than firewall and IDS [closed]

I was just studying about firewalls and IDS/IPS and had a doubt. Are these the only two major security devices that a company invests in? or are there other equipment and security controls?
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188 views

Snort: Arpspoof preprocessor events not showing up in BASE UI

I have followed this guide to install Snort, using Barnyard2, BASE, IIS, and MySql. My Snort is up & running and loads of events are being logged. After weeding out some false positives, I wanted ...
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313 views

Is it possible to detect a keylogger, when placed? [duplicate]

Can you detect a keylogger when it is placed? Would it be possible to do that via a keyboard removed event, expecting the keyboard is not removed regularly? So that you for example get a pop-up/alert ...
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300 views

problem with my snort rule

I have written this rule but when I try to reload Snort it is failing. I have commented out the rule and reloaded snort; it is working so I know it's the rule. alert tcp any any -> any 5466 ...
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84 views

Customize an Intrusion Detection System for serial communication

Most of the Intrusion detection Systems I know of is for IP Communication. But, lets assume that I have serial communication, i.e. CAN or RS485. On this serial Communication there are customized ...