Tuesday, October 18, 2022

New Snort 3 rule writing guide available

Snort 3's new features, improvements and detection capabilities come with updates to the Snort rule language syntax and the rule-writing process.  

To help with that, direct from the Talos analyst team, comes the Snort 3 Rule Writing guide: Detailed documentation for all the different rule options available in Snort 3. 

The Snort 3 Rule Writing Guide is meant for new and experienced Snort rule-writers alike, focusing primarily on the rule-writing process. It is intended to supplement the documentation provided in the official Snort 3 repository (the official Snort User Manual). Each rule option has its own page to describe its functionality and syntax, along with examples to show how the option might be used in a Snort rule.  

The guide covers the essential information for new Snort users to get Snort 3 up and running. This includes installation and usage instructions, a brief look into Snort 3's internals, the basics of configuration files, and detailed information on writing effective Snort 3 rules. Despite the manual's broad scope, users will however still need to refer to the full user manual to find more comprehensive and advanced guidance on non-rule-writing-specific topics. 

Experienced Snort users who are already comfortable using Snort can skip the "Getting Started" section and instead jump right to the "Rule Options" section to get extensive documentation on the unchanged, updated and new rule options present in Snort 3. Watch out specifically for the now-sticky HTTP buffers, the new "alert file" and "alert http" rule types, as well as the new options like "http_param", "js_data", and "bufferlen".

As Snort 3 continues to evolve, this manual will too. The analyst team will provide updates to the manual to keep the greater Snort community abreast of any recent changes. 

Thursday, September 22, 2022

Snort OpenAppID Detectors have been updated

SNORTⓇ released a new update today for its OpenAppID Detector content.

This release — build 356 — includes:
  • 3,374 detectors. 
  • Additional detectors from the open-source community. For more details on which contributions were included — we have added them to the "Authors" file in this package.
The release is available now on our Downloads page. We look forward to users downloading and using the new features. If you have any feedback,  please share it with the OpenAppID mailing list.

The OpenAppID package is also compatible with our most recent Snort 3 releases.

For more information regarding the applications that are included in the open-source version of OpenAppID, feel free to visit our new application portal at appid.cisco.com.

Thursday, June 9, 2022

Changes to the community rule release schedule

By Jon Munshaw. 

As of this week, we are changing the cadence for releases for the Snort community rule set. 

Previously, the community rules were released every day at 11:40 a.m. ET, even if there are no rule changes. Now, the rule set will align with our normal open-source build and release schedule. This is usually every Tuesday and Thursday, though this may change based on public holidays and ad hoc releases for certain vulnerabilities or malware families. 

We apologize for any disruptions this may cause.  

Community rules are a set of rules that members of our open-source community or Snort integrators have submitted. These rules are freely available to all Snort users and are governed by the GPLv2. Anyone can submit a community rule using the Snort Rules mailer here

Community rules are available for anyone to download here without registration and are free of charge without any Rule Set License restrictions.  

Friday, April 1, 2022

Weekly Snort rule update for March 25 - April 1

 Cisco Talos released two new rule sets for SNORTⓇ this week, which you can view here and here.

There are multiple rules to protect against the exploitation of the highly publicized Spring4Shell vulnerabilities that could lead to remote code execution. Spring is a popular framework used to develop Java applications. Snort SIDs 30790 - 30793, 59388 and 59416 can detect this activity.

For more on these vulnerabilities, read the Talos blog here

All users can subscribe to Talos' newest rule detection functionality for as low as $29 a year with a personal account. Be sure and see our business pricing as well here. The Snort 3 release is also here after years of development and improvements, which you can upgrade to here.

Snort's rule blog posts are switching to a weekly recap format, rather than releasing every day a new rule update is released. If you have any feedback on this blog format, please reach out to us on Twitter @Snort

Friday, March 25, 2022

Weekly Snort rule update for March 21 - 25

Cisco Talos released two new rule sets for SNORTⓇ this week, which you can view here and here.

All users can subscribe to Talos' newest rule detection functionality for as low as $29 a year with a personal account. Be sure and see our business pricing as well here. The Snort 3 release is also here after years of development and improvements, which you can upgrade to here.

Snort's rule blog posts are switching to a weekly recap format, rather than releasing every day a new rule update is released. If you have any feedback on this blog format, please reach out to us on Twitter @Snort

Thursday, March 17, 2022

Weekly Snort rule update for March 14 - 18

Cisco Talos released two new rule sets for SNORTⓇ this week, which you can view here and here.

The rules from this week cover a variety of malware families, including the CaddyWiper threat that's been targeting users in Ukraine. The wiper is relatively small in size and dynamically resolves most of the APIs it uses. Cisco Talos' analysis didn't show any indications of persistency, self-propagation or exploitation code.

We also released new protections for the Dirty Pipe exploit recently discovered in the Linux operating system. This vulnerability could allow an attacker to completely root devices, including some Android devices, as researchers showed with the Google Pixel 6. QNAP also warned users that its network-attached storage devices are also at risk

All users can subscribe to Talos' newest rule detection functionality for as low as $29 a year with a personal account. Be sure and see our business pricing as well here. The Snort 3 release is also here after years of development and improvements, which you can upgrade to here.

Snort's rule blog posts are switching to a weekly recap format, rather than releasing every day a new rule update is released. If you have any feedback on this blog format, please reach out to us on Twitter @Snort

Snort OpenAppID Detectors have been updated

SNORTⓇ released a new update today for its OpenAppID Detector content.

This release — build 353 — includes:
  • 3,370 detectors. 
  • Additional detectors from the open-source community. For more details on which contributions were included — we have added them to the "Authors" file in this package.
The release is available now on our Downloads page. We look forward to users downloading and using the new features. If you have any feedback,  please share it with the OpenAppID mailing list.

The OpenAppID package is also compatible with our most recent Snort 3 releases.

For more information regarding the applications that are included in the open-source version of OpenAppID, feel free to visit our new application portal at appid.cisco.com.

Thursday, February 17, 2022

Weekly Snort rule update for Feb. 14 - 18

Cisco Talos released two new rule sets for SNORTⓇ this week, which you can view here and here.

Our two releases include several new protections against a variety of malicious webshells. There is also an additional rule that protects against the string of vulnerabilities Cisco recently disclosed in its RV series of routers aimed at small businesses.

The CVEs have a combined severity score of a maximum 10 out of 10. If successful, an adversary could execute arbitrary code on the targeted device, cause a denial of service or bypass authentication protections.

All users can subscribe to Talos' newest rule detection functionality for as low as $29 a year with a personal account. Be sure and see our business pricing as well here. The Snort 3 release is also here after years of development and improvements, which you can upgrade to here.

Snort's rule blog posts are switching to a weekly recap format, rather than releasing every day a new rule update is released. If you have any feedback on this blog format, please reach out to us on Twitter @Snort

Thursday, February 3, 2022

Snort 3.1.21.0 is now available (plus bonus information on Thursday's rule update)

 

The SNORTⓇ team recently released a new version of Snort 3 on Snort.org and the Snort 3 GitHub. Thursday also brought us the latest rule release, which includes several rules to protect against critical vulnerabilities Cisco patched in its RV series of routers. You can see more about this rule update here.

 

Snort 3.1.21.0 contains several new features and bug fixes. Here's a complete rundown of what's new in this version. Users are encouraged to update as soon as possible and to upgrade to Snort 3 if they have not already done so.

Here's a rundown of all the changes and new features in this latest version of Snort 3.

Snort OpenAppID Detectors have been updated

SNORTⓇ released a new update today for its OpenAppID Detector content.

This release — build 352 — includes:
  • 3,280 detectors. 
  • Additional detectors from the open-source community. For more details on which contributions were included, we have added them to the "Authors" file in this package.
The release is available now on our Downloads page. We look forward to users downloading and using the new features. If you have any feedback,  please share it with the OpenAppID mailing list.

The OpenAppID package is also compatible with our most recent Snort 3 releases.

For more information regarding the applications that are included in the open-source version of OpenAppID, feel free to visit our new application portal at appid.cisco.com.