Questions tagged [suricata]

Suricata is a free and open source, mature, fast and robust network threat detection engine.

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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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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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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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173 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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Suricata bypass keyword

I have not found any examples on using the 'bypass' keyword. Does it work in any rule? Are there performance implications using 'bypass'. For example, would this bypass all tcp traffic? alert tcp any ...
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94 views

Suricata not matching a packet

What happens to a packet that has no matching rule in Suricata. I assume it is ignored, but haven't found any definitive info on this. So, if my assumption is correct and the packet is ignored, would ...
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1answer
515 views

Custom Suricata's HTTP alert isn't triggered when using “..” as part of the scanned uri. Why? [closed]

I have a doubt with a Suricata custom rule. If I do: alert http any any -> any 80 (msg:"blabla"; content:"abc"; http_uri; sid:1000000;) I can get requests to http://x.x.x.x/abc uri in fast.log ...
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601 views

Loopback with Suricata

Is there any way of analyzing loopback traffic with Suricata? I am trying it this way without success: root@security-onion:/home/sar/TFM/alerts/suricata# suricata -c /etc/suricata/suricata.yaml -i ...
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609 views

Analyzing Apache log with Snort

I need to analyze an Apache log with Snort and others IDS/WAFs (Suricata, mod_security and Shadow Daemon). In order to do so, I was thinking about create TCP packets with the GET and POST requests ...
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1k views

Virustotal detecting threats in Suricata rule set

Virustotal scans are detecting threats from the Suricata default rule pack located https://rules.emergingthreats.net/open/suricata-4.0/ Is this a false positive? https://www.virustotal.com/#/file/...
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How can I get Suricata to alert on 1 packet every time

I am trying to write a Suricata signature for testing purposes to alert every time it is triggered with a single PCAP file containing a single packet, but this is proving to be harder than I thought. ...