Intrusion Detection Systems

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What approaches are to detect DoS attack in IDS/Firewall?

First approach to DoS attack detection: There are techniques for intrusion detection, and of course DoS attack, in which for each packet (or flow) some features are calculated, then based on some ...
0
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1answer
330 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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2answers
151 views

anomaly detection: feature calculation problem [closed]

I have a question about how to calculate features selected in [ 1 ]. It assumes that the impact of DoS attack on features are nSrcs=nDsts=1, nPkts/sec>a, nSYN/Pkts>b, ... (Table 1 of [ 1 ]) ...
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1answer
212 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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1answer
236 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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1answer
833 views

Why aren't anomaly-based intrusion detection schemes implemented in Snort?

I have read many papers on anomaly-based network intrusion detection. Am I correct that each of their techniques could be implemented as Snort preprocessor? If this is true, why there are no anomaly ...
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1answer
412 views

Anomaly Intrusion Detection relevant features

I am researching on Anomaly Intrusion Detection to implement one. At this phase, I am searching for relevant features to network traffic. I found 41 features from KDD CUP'99 project (the paper: WENKE ...
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3answers
2k views

Using an IPS as an alternative to mod_security

I am considering deploying mod_security as an addition to our web infrastructure. I am worried about the increased load however as these servers get a lot of hits. I am considering using IPS's such ...
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2answers
350 views

Enterprise IDS - Deployment & Uses

I am investigating deploying the Snort IDS for an enterprise environment. This environment consists of a NOC that manages several servers, mainly internal but some internet facing. There are several ...
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1answer
633 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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1answer
566 views

Open source or common implementations for reverse proxy web application security

I realize there is already a question similar to this one, but this is somewhat of a follow-up. I understand that a reverse proxy server by itself is hardly useful as a web app security measure ...
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2answers
73 views

Information disclosure by identifiers

I'm doing a small research and I observed quite a lot of sites that reveal some private information in the ID-s that they assign. As an example I would like to point out e-commerce sites that issue ...
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1answer
426 views

Examples for (Web-)Security-Architectures

I just started to work on my thesis to finish my studies. However the field in which I write my thesis is pretty much new to me. I have the task to build a "Remote-Access Strategy/Architecture" to ...
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5answers
18k views

How to check if someone is in my computer [duplicate]

Igen suspect that someone is may be controlling my computer using some remote desktop app. How I check if I am right or not? My only clue is that my mouse sometimes start to move randomly (it is not ...
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1answer
1k views

How can an admin choose which Snort rules to enable?

The purpose is to configure Snort as an IDS to monitor network activity, and alert against the standard set of things an IDS should alert against--> buffer overflow attacks, injection attacks, port ...
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5answers
1k views

Neural networks & anomaly detection

Neural networks, with their ability to learn behavioural patterns from arbitrary data, seem like a natural way to deal with intrusion detection. There are many academic papers on the topic which ...
2
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1answer
234 views

IDS/WAF scenario for 2 web servers

I'm running 2 web servers on 2 different physical hosts at home. They handle both HTTP and HTTPS traffic. I want to protect against web application attacks, but don't want to spend money for ...
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1answer
755 views

Is a honeypot an IDS or an IPS or something else? Is it an offensive or a defensive technique? Is it still effective?

I'd like to know where a Honeypot falls into the scheme of security, and if it is still an effective tool?
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2answers
177 views

Is this enough for an NIDS

I am doing my senior project on network intrusion detection system (ethernet networks) and I am having a bit of trouble deciding if I have added enough features. Currently the system detects the ...
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2answers
249 views

Security model for datacenters

I have several datacentres and now I want to plan security for it, so it's resilient to external attacks. I need to make a security model which will cover my web servers, auth servers, log servers, ...
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2answers
643 views

Detect changes in /boot when using full disk encryption

When running a fully encrypted linux system using dm-crypt, the /boot partition has to be unencrypted to boot, as far as I know. I've setup a server that can be unlocked remotely by connecting to a ...
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1answer
2k views

Snort & Logging

I am looking for some support on using Snort in Windows 7. My experience so far is using WireShark, so this is new territory to me. I would like to use Snort to perform a trace, which, after it ...
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2answers
1k views

Snort Sensor Placement

I have a snort sensor monitoring some of my network being fed from a mirrored port. This mirrored session only monitors traffic between the firewall and peering switch. Since this just sees traffic ...
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4answers
736 views

Detecting malware hidden in P2P traffic

Consider a network situation involving (only) Peer to Peer traffic in medium sized network. For the sake of convenience, a simple P2P application like DC++ may be assumed, although I am aiming at a ...
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4answers
439 views

Writing exploit code that bypasses IPS detection

Suppose that Network IPS/IDS can detect an exploit, however, the application server itself is still vulnerable to that exploit. If I modify the exploit code, are there IPS/IDS which will still ...
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2answers
622 views

How are signatures for IPS determined

For example , how do Snort's VRT team or some one who gives us the signatures, determine them at all ? I would be more interested to know , how are the traffic patterns analyzed against some known ...
4
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1answer
568 views

Outbound TFTP request to 255.255.255.255

Recently snort notified me that I have a user's computer on my network initiating an outbound TFTP request. The odd thing is the destination is 255.255.255.255 Anyone have a clue as to what this may ...
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0answers
208 views

AD authentication with high amount of ICMP traffic [closed]

We have an IPS in place and it's constantly triggering ICMP / Ping flood signatures between workstations and AD server; or AD to workstation. I understand that ICMP is used for AD authentication. ...
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1answer
2k views

Bench marking Snort and other IDS/IPS

I am looking for facts and figures of research or surveys done which have bench-marked Snort with other IDS/IPS on various parameters like overall performance, accuracy, speed, documentation, ...
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2answers
526 views

C&C domains used by Flame/Skywiper trojan

I'm trying to figure out if any of our clients have been infected by the recent trojan/worm Flame. I have access to our proxy logs, so I want to search for any requests made to the "known" C&C ...
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1answer
227 views

SNMP trap by legitimate program?

Is there any way to tell if this SNMP trap is something created by a legitimate program? Update: Hex Dump 0000000: 30 82 00 ec 02 01 00 04 06 70 75 62 6c 69 63 a4 82 00 dd 06 82 00 09 2b 06 ...
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4answers
23k views

Testing Snort IDS installation

What is the easiest way to test Snort IDS after installing? Would using and writing a rule that captures all of the traffic work? alert ip any any -> any any ( msg: "ICMP packet detected!"; sid: ...
3
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3answers
848 views

Published data sets for IDS/IPS evaluation

I am looking for data sets published by researchers or freelancers which can be used for the purpose of IDS/IPS testing and evaluations. The data sets may be for portscans, DoS attacks, Remote to ...
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1answer
178 views

WEB long basic authorization string/Buffer Over Flow

I have a external user getting a weird error in the middle of using my website. The user authenticates, post a search for information, and then with the address of the search results page they get a ...
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1answer
131 views

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
984 views

What IDS Do you recommend? [closed]

I am running a Debian Squeeze VPS and need a good IDS. I have used snort before and it was quite good but i am wandering if there are any other good ones out there. Preferably compatible with ...
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3answers
2k views

HIDS detection system and registry changes

I use OSSEC HIDS to monitor XP and Windows 7 Operating Systems. When OSSEC flags changes in the Windows registry, I have no idea where to go for to look for information and identify if the changes ...
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2answers
3k views

Snort false positive?

I've set up snort and am configuring it for my network. I have one vpn server making a connection to my dns/AD server. This connection sets off: GPL SHELLCODE x86 inc ebx NOOP The payload is as ...
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3answers
209 views

will all instrusion dectection will become host-based? [closed]

Will all intrusion detection become host-based once all network packets have been encrypted?
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3answers
267 views

Is there an IDS based on process patterns?

After reading what Metasploit is able to do my grey hairs got even more. From my understanding current attack methods are being done without tampering with any file in a filesystem - thus rendering ...
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2answers
927 views

Is traffic sent by Mouse Without Borders encrypted?

Some of our users have installed Mouse Without Borders and I wanted to know if it is possible to intercept the traffic being sent between the two computers and read it in some meaningful manner. I was ...
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1answer
585 views

SSL protocol issues on OS X and iOS

I have a PfSense box as a UTM, running snort among other things. I started noticing that when MacBooks and iPhones/iPods connect to my network, the snort log gets flooded with this message: ...
2
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1answer
339 views

Stateful Signatures in an IPS

I am researching IPS devices and their signatures both stateful and stateless. The test network I am looking to implement the IPS in has asymmetric traffic so stateful inspection would be nearly ...
0
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1answer
114 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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2answers
9k views

Detecting the presence of wifi devices

Is it possible, with a normal wifi adapter, to detect present wifi devices in the surrounding? Let's say, is it possible to detect an Iphone with wifi switched on in the range of my wifi adapter? ...
5
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2answers
1k views

How effective is an IDS at catching targeted attacks

I have recently become very familiar with IBM Site Protector. As I understand things, Site Protector is in the top tier of IPS/IDS systems, used by some of the largest Fortune 500 companies. I was ...
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1answer
362 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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1answer
516 views

types of intrusions on host [closed]

I am implementing an IDS and just want to know that what are the possibilities with which the intrusion can occur.I am just doing a literature survey over the atacks possible so I want to know that ...
12
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9answers
18k views

Tracking down a rogue access point

Over the course of about a month we have received multiple reports of a rogue access point attempting to intercept traffic. I suspect an attacker is using a wifi pineapple, or similar hardware ...
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3answers
354 views

Implementation of an IDS

I am starting my final year project and I have decided to make an Intrusion Detection System, but I am a little confused where to start. I have read some papers and those have been pointing out the ...