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

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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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119 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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77 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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152 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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271 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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72 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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51 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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122 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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293 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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818 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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124 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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457 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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Difference between brute-force and dictionary-based in the mitigation process of the IPSs

I am working with Bro IDS and CIF ( cyber threat intelligence) using the Intel framework I am testing. How can I mitigate brute-force and dictionary-based attacks? I found that the mitigation ...
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14 views

Bluecoat sc-filter-result: DENIED but s-action: ALLOWED [migrated]

I have a bluecoat server which sometimes creates rows which don't make sense: { ... "sc-filter-result": "DENIED", "s-action": "ALLOWED" } How is it possible to be both DENIED and ALLOWED?
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0answers
20 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
65 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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89 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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212 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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182 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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74 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 ...
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45 views

Possible to run snort without modifiers?

Is there anyway (e.g some command line argument) with which we can tell snort to run and perform detection but without caring for the rule modifiers if there are any ? e.g alert tcp any any -> ...
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121 views

SSL Certificate and IDS\IPS

I'm currently drafting an infrastructure design to provide web (internet) access to a number of users to an internal web server in our perimeter DMZ, we have no direct internet access but we do have a ...
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2answers
1k views

What are the difference between IPS and WAF in terms of DDoS?

I have heard about both Web Application Firewalls (WAF) and Intrusion Prevention Systems (IPS). Which is better in preventing a Distributed Denial of Service (DDoS) attack and why?
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1answer
113 views

What steps are performed when a serious event reaches an Intrusion Detection System? [closed]

For example, you are using Snort and you just got a serious event, which states that a certain service is attacked. What do you do with the threat source IP? What are the steps that network event ...
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1answer
140 views

Can Snort be configured as HIDS?

I need to give a presentation regarding Snort and Security Auditing. I have recently learned to configure Snort as a NIDS. I want to know is there any way I can configure Snort as an HIDS? If I am ...
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2answers
81 views

Detecting malicious domains/URLs [closed]

Do state of the art commercial URL threat intelligence feeds ( for example, one's by Symantec, Intel-security etc) miss malicious domains? (i.e. domains serving malware,exploit code & phishing ...
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Recommendations for installing OSSIM

I'm an apprentice in web security and I was assigned with the task of researching about OSSIM. Bear with my infinite ignorance as I take my questions to the stack exchange gurus. What I know so far: ...
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Solutions to TCP FIN Host Sweep (Signature 3032)

The Intrusion Prevention System is giving me an attack with signature 3032, TCP FIN Host Sweep on one of the ip addresses. I need a solution or recommendation on how to avoid the TCP FIN Host Sweep.
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5answers
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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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2answers
91 views

Block all kind of querys from ip [closed]

I want to check my network intrusion detection system (physical intrusion like unauthorized gadgets or devices in wifi/ethernet). Until now everything is ok, but I was wondering if I block every query ...
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2answers
184 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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2answers
82 views

Ips used by the same person?

Is it possible to find out if ips are from the same location and used by one person. We have a situation were three ips have been logged etc. We know for sure that two are from the same person this ...
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network IDS capabilities for attack detection [closed]

Is a Network Intrusion Detection System (NIDS) (pattern matching, protocol analysis or behavior analysis) able to detect buffer overflow in the network traffic?