Questions tagged [suricata]
Suricata is a free and open source, mature, fast and robust network threat detection engine.
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53 views
IP Blocklists for Firewall (pfSense) [closed]
We want to improve cyber security and I consider installing Suricata on our firewall (pfSense). Malware and Ransomware (as for anyone, I guess) concerns me much and one way to deny Ransomeware its ...
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35 views
Can I write a suricata rule based on the timestamp the packet arrives on the host?
We have a need to check the arrival time of two relative packets, like packet1 and packet2, if packet2 arrives too late after packet1, we want an alert for it.
Is it possible to write a rule for this? ...
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379 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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40 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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149 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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1answer
278 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
254 views
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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1answer
120 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
718 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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685 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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1answer
687 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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0answers
794 views
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.
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