Questions tagged [ids]

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

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1answer
76 views

Preventing DDOS attacks without collecting personal data? [closed]

Could anyone suggest a system to prevent DDOS attacks without collecting personal data like i.p. addresses ( or using anonymized data ) and be not deny access to an innocent user ?
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1answer
108 views

SNORT rule for detecting/preventing unauthorized VPN or encrypted traffic

Here's my not so theoretical scenario: A day-one Trojan horse attack where the attacker sets up a secure connection back to himself using a well known trusted port, such as 80 21 443. Or for instance, ...
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How does one label malicious traffic in generated workloads?

I have been writing on some code that automatically puts together differently parameterized attacks of common pen testing tools, i.e. sqlmap, nmap, patator etc. These attacks are then launched against ...
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34 views

Snort throws no alerts at php/meterpreter_reverse_tcp connection?

Snort newbie here. I don't know what I'm doing wrong and I hope someone can help me. I set up snort on a pfSense VM, on the WAN interface i have a Kali VM connected, on the LAN interface there is a ...
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1answer
56 views

Is there any advantages in using a Network Intrusion Detection System, when already having a EDR solution?

Does implementing a Network Intrusion Detection System (NIDS) give you any advantages over an Endpoint Detection and Response (EDR) solution? I've been trying to do research on this, but are ...
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1answer
64 views

Processing Exceptionally High Volume Singular Flows

I wanted to know if anyone had experience sensoring single flows that generate 90 kpps or upward of traffic. My conundrum is that I use tools which I would like to be able to properly see an entire ...
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1answer
172 views

Suricata - How to use TCP Flags?

I wrote the following rules: alert tcp any any -> 192.168.6.4 any (msg:"SYN"; flags: S;) alert tcp any any -> 192.168.6.4 any (msg:"FIN"; flags: F;) The SYN rule is matching....
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1answer
155 views

Snort Inline Mode(IPS) Routing Packet Forwarding

I'd like to build an IPS which would be a seperate endpoint than the router and/or protected servers. To achieve this I've installed to my Ubuntu server Snort with DAQ(AFPACKET). The instructions I've ...
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1answer
52 views

script encoder for IDS test

Encoding a payload is a means of evading antivirus or IDS. With regard to scripts is there a way to do the same thing? For instance, is it possible to encode a python script in order test intrusion ...
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1answer
28 views

Help in Suricata rule bitmask syntax problem

I have written the following rule in my Suricata rules file: alert tcp any any <> any any (flow:established; content:"|65|"; offset:0; depth:1; byte_test:1, =, 3, 2, bitmask 0x03; msg:&...
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0answers
55 views

Auto updating attack signature Firewall, WAF, IPS & IDS to secure Azure services?

We have a need to secure the Application Gateway and hundreds of APIs exposed to the Internet as part of our production environment. Using the existing built-in, Azure services, how to make it secure ...
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0answers
48 views

PCI-DSS Level 1 requirement for Intrusion Detection and Prevention on AWS API Gateway and AWS Lambda

Our architecture is based on the best practices for PCI-DSS on AWS Amazon WAF -> API Gateway -> AWS Lambda The lambda's are running within a VPC and the SG / Firewall and segmentation have been ...
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0answers
55 views

Implement IPS (Intrusion Prevention System) on Kubernetes

This a bit of a broad question, I know. Our security team at work gave us the task to implement an IPS (Intrusion Prevention System) for our infrastructure and no specs (surprise!). We have several ...
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1answer
135 views

Suricata Ripple20 rule for IP-in-IP resulting in 100M alerts

I found too many events in Suricata after recent update regarding this rule: alert ip any any -> any any (msg:"ET EXPLOIT Possible CVE-2020-11900 IP-in-IP tunnel Double-Free"; ip_proto:4; ...
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0answers
61 views

What happens if a sender changes the TCP window size over multiple packets that have the same ACK number?

I'm currently doing research on evasion attacks that seek to bypass a Deep-learning based Network Intrusion Detection System. In order to achieve this, I need to know what the constraints are for the ...
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1answer
210 views

Suricata and rules based on MAC address

I'm working on a project to implement SDN in a network. One of my flows is redirecting to the Suricata IDS and the flow works in layer 2 with MAC address. Since I've read that Snort only works in ...
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1answer
70 views

Snort automatic protocol detection

Does Snort have the "automatic protocol detection" function like Suricata? I read that Snort 3 has "Autodetect services for portless configuration" feature. Does it mean that this ...
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2answers
2k views

Difference between Zeek (Bro) and Snort 3

I'm trying to find difference between Zeek and Snort 3. Сan anybody tell me what are the advantages of Zeek against Snort 3?
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0answers
34 views

Snort analyze reply based on request

I'm trying to write a snort rule which detects if certain binary files where requested via HTTP based on a regex rule matching there names. But it should only send an alert if the file exists (e.g. ...
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1answer
98 views

ids - How do I match any string in a list of snort contents?

If I do something like alert tcp any any <> any any (content:"TestA"; content:"TestB"; sid:1000000; msg:"Syntax correct!";) then the syntax is correct, but, what I would like to do is to ...
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1answer
117 views

Is there a way to lock down a network? [closed]

If supposing I discover that my network is being attacked by some hacker or is being compromised in any way and I am able to detect it. So, is there any software-oriented way of 'locking-down' the ...
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1answer
86 views

Whats The Point of GeoBlocking if the Firewall Has An Implicit Deny?

What is the point of geoblocking IP addresses with cisco firepower or a similar service if the firewall would block the request anyway? For example, We only do business in the USA but see source IP's ...
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0answers
67 views

Deciding between MDR solutions offering endpoint agents with or without an additional network appliance?

There are a number of different Managed Security Service Providers (MSSPs) offering managed detection and response services. They tend to use what is called an endpoint agent, while only some use a ...
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0answers
35 views

Possible to verify the integrity of AIDE itself?

I recently installed the package AIDE (Advanced Intrusion Detection Environment) on my Linux server. This is a web server installed about a year ago. Since no integrity checks have been done before on ...
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1answer
232 views

Is fail2ban an intrusion prevention system?

I know what fail2ban does; it monitors the firewall logs and finds ip addresses that have too many failed logins to ssh; and then tells the firewall to drop packets from those addresses. So is ...
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0answers
133 views

Cost range of IPS solutions [closed]

We have a client web application running in Azure Kubernetes. There was an optional requirement to implement IPS for the application. It was considered optional, because the application that we are ...
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0answers
132 views

Snort Content first 3 bytes the same then create an alert [closed]

I was wondering if you could add into a snort rule the ability to only alert if the first 3 bytes match. I think I need to edit the content in my current rule content:"|37 e1 a4|"; I can add the full ...
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0answers
192 views

FYP ideas in Applications of Machine Learning in Cyber Security domain [closed]

I am a Computer Science Engineering undergraduate aspiring to pursue a career in the field of cyber security. I have some experience in web application security, memory and network forensics fields. I ...
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0answers
44 views

IPS solution for a medium sized web application

As part of application security compliance we are supposed to implement an IPS on our application. The application is basically an educational web portal where students can enrol for course assessment....
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1answer
157 views

Difference between NIDS and NBA

I'm having trouble understanding the difference between NIDS (Network-based Intrusion Detection System) and NBA (Network Behavior Analysis) It is to my understanding that NIDS use two detection ...
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0answers
85 views

Executable scrambling with Hyperion is detected. What can I do?

I am using Hyperion v2.1 to scramble (polymorphism) some .exe file: hyperion.exe myexefile.exe scrambled.exe The resulting scrambled.exe file is detected and deleted by the AV or IDS system. As ...
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1answer
630 views

How to create content rule in Snort

The aim is to detect, if anyone in the HOME_NET is searching for a particular term - say "terrorism" and generate an alert via a content based rule. I am using Snort 2.9 installed in a virtual ...
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0answers
141 views

error read-file in snort when reading back pcap file

I get this error when using snort -r to read a saved pcap file and apply snort rules on it. ERROR : pfring daq does not support read-file I am running snort in Security Onion I tried many things: ...
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1answer
163 views

Centralized brute force login detection using netflow data

Is brute force login detection feasible with netflow data? With the netflow data one could check the number of incoming packets to a specific destination port (for each flow). If the number is below a ...
2
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0answers
236 views

Stateful detection in Snort

From whatever I have read of Snort, it can analyse a single packet at a time and raise an alert based on its rules. What if I wish to have a rule based on multiple packets such as analysis of a ...
0
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1answer
67 views

What does “DECed” mean in Network Security?

As in this MIB documentation: http://www.circitor.fr/Mibs/Html/F/FORTINET-FORTIGATE-MIB.php#fgIpsAnomalyDetections fgIpsAnomalyDetections 1.3.6.1.4.1.12356.101.9.2.1.1.9 Number of intrusions DECed ...
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2answers
1k views

Is using a ja3 hash worth it?

I've been reading about ja3 and ja3s hashes, and although it certainly is a way to address suspicious traffic detection in encrypted traffic it still is, at least in my opinion, a static approach. It ...
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1answer
59 views

How would you characterize a cyber surface? [closed]

Thinking through a network boundary characterization, say firewall/IDS flux. How some activity may change profile of that surface.
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0answers
156 views

IDS/IPS payload analysis [duplicate]

While reading about IDS/IPS systems it is often mentioned that they analyze the "payload information of a packet" but what "payload" do they exactly look at?
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1answer
340 views

Public Availability of a good Dataset in PCAP (TCPDUMP) format for IDS/IPS testing [closed]

I am trying to pass good reputable malicious traffic from an IPS. There are several sources on internet to explore datasets like the oldest I think DARPA set (not available in pcap format and not that ...
2
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1answer
66 views

Confusion Matrix for Generated Signatures in Snort

How do we come with True Positives and False Negatives rates when creating signatures in IDS? How do we measure the signatures efficiency? I've seen so many papers that discuss the same, but how do ...
2
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1answer
794 views

What is an Albert sensor?

Recent news articles have started to talk about government networks deploying "Albert sensors" (e.g., this article). What is an Albert sensor? And how effective is it? Going purely from context, it ...
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1answer
285 views

Advice to detect suspicious activities on network

A private network (about 150 PCs) is connected to the internet through an edge router. According to the net admin, his network is scanned from the outside, at the edge router. I don’t have any more ...
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1answer
3k views

Snort rule for syn flood attacks - Limiting number of alerts

So I have a snort rule that detects syn flood attacks that looks like this: alert tcp any any -> $HOME_NET 80 (msg:”SYN Flood - SSH"; flags:S; flow: stateless; detection_filter: track by_dst, ...
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7answers
25k views

Is it possible to detect 100% of SQLi with a simple regex?

I'm wondering if it is possible to detect 100% of the possible SQLi attacks using a simple regex. In other words, using very simple PHP code as an example: if (preg_match("/select/i", $input)) { ...
1
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1answer
107 views

Multiple outbound TCP/8333 connections containing the EICAR test string

An IPS / IDS / UTM detects 50 connections from a single client containing Virus/Worm Eicar test string within half an hour. The destinations are IP addresses all around the world on port TCP/8333. A ...
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1answer
293 views

Can Snort or Suricata *edit* packet on the fly?

I know that they can detect traffic by rules, but can they modify packets on the go? For example, not only detecting HTTP GET but also adding headers to the GET packet. If they can't, is there an ...
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3answers
3k views

intrusion prevention system detected “et policy pe exe” should i worry

I have a UniFi Security Gateway (USG Pro 4P) and just enabled IPS (intrusion prevention system). I am seeing many "ET POLICY PE EXE or DLL Windows file download HTTP" alerts. I have not been able to ...
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2answers
1k views

Windows process documentation for tuning Sysmon

I recently installed Sysmon, which logs events to OSSEC and currently monitors several endpoints. I have been trying to whitelist benign processes such as Windows services. Many of these processes run ...
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2answers
343 views

Is there any methodology to detect smart deauthentication attack?

I'm a project student in IIT-Hyderabad. I have been working in Wifi security domain for my M.Tech. In particular, I chose de-authentication attack. Whenever I sent De-Auth frames continuously to APs ...

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