Talos Rules 2026-05-26
This release adds and modifies rules in several categories.

Talos has added and modified multiple rules in the browser-ie and os-linux rule sets to provide coverage for emerging threats from these technologies.

For information about Snort Subscriber Rulesets available for purchase, please visit the Snort product page.

Change logs

29200

2026-05-26 20:01:20 UTC

Snort Subscriber Rules Update

Date: 2026-05-26

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 2092000.

The format of the file is:

gid:sid <-> Default rule state <-> Message (rule group)

New Rules:


 * 1:66507 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66508 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66509 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66510 <-> DISABLED <-> MALWARE-CNC Win.Infostealer.Stealc variant communication (malware-cnc.rules)
 * 1:66511 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66512 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66513 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)
 * 1:66514 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)
 * 1:66515 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.Redline variant communication (malware-cnc.rules)

Modified Rules:


 * 1:35170 <-> DISABLED <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt (browser-ie.rules)

29181

2026-05-26 20:01:20 UTC

Snort Subscriber Rules Update

Date: 2026-05-26

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 2091801.

The format of the file is:

gid:sid <-> Default rule state <-> Message (rule group)

New Rules:


 * 1:66515 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.Redline variant communication (malware-cnc.rules)
 * 1:66511 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66508 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66509 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66512 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66513 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)
 * 1:66514 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)
 * 1:66507 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66510 <-> DISABLED <-> MALWARE-CNC Win.Infostealer.Stealc variant communication (malware-cnc.rules)

Modified Rules:


 * 1:35170 <-> DISABLED <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt (browser-ie.rules)

29171

2026-05-26 20:01:20 UTC

Snort Subscriber Rules Update

Date: 2026-05-26

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 2091701.

The format of the file is:

gid:sid <-> Default rule state <-> Message (rule group)

New Rules:


 * 1:66515 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.Redline variant communication (malware-cnc.rules)
 * 1:66512 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66509 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66513 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)
 * 1:66510 <-> DISABLED <-> MALWARE-CNC Win.Infostealer.Stealc variant communication (malware-cnc.rules)
 * 1:66511 <-> DISABLED <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt (os-linux.rules)
 * 1:66508 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66507 <-> ENABLED <-> MALWARE-CNC Win.Trojan.Agent variant communication (malware-cnc.rules)
 * 1:66514 <-> ENABLED <-> MALWARE-CNC Win.Infostealer.XWorm variant communication (malware-cnc.rules)

Modified Rules:


 * 1:35170 <-> DISABLED <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt (browser-ie.rules)

3200

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.2.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

3351

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.3.5.1.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

3360

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.3.6.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

3370

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.3.7.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

3700

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.7.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

3900

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.9.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31110

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.11.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31150

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.15.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31180

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.18.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31200

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.12.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31210

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.21.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31350

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.35.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31440

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.44.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31470

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.1.47.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31100

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.11.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt

31200

2026-05-26 20:03:37 UTC

Snort Subscriber Rules Update

Date: 2026-05-26-001

This is the complete list of rules modified and added in the Cisco Talos Certified rule pack for Snort version 3.12.0.0.

The format of the file is:

gid:sid <-> Message

New Rules:

* 1:301510 <-> OS-LINUX Linux Kernel Dirty Frag privilege escalation attempt
* 7:10 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:11 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:12 <-> MALWARE-CNC Win.Infostealer.Redline variant communication
* 7:3 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:4 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:5 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication
* 7:6 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:7 <-> MALWARE-CNC Win.Trojan.Agent variant communication
* 7:8 <-> MALWARE-CNC Win.Infostealer.Stealc variant communication
* 7:9 <-> MALWARE-CNC Win.Infostealer.XWorm variant communication

Modified Rules:

* 1:35170 <-> BROWSER-IE Microsoft Internet Explorer MutationObserver use after free attempt