Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects attempts to downgrade network device firmware via SSH by looking for the string "boot system flash" in TCP traffic directed to port 22 (SSH). This command is commonly used on Cisco IOS devices to specify the system image to boot from, and its presence in an SSH session could indicate an attempt to revert to an older, potentially vulnerable firmware version or to a malicious image.
This rule detects attempts to patch a Cisco IOS router image remotely via SSH. It specifically looks for the string "copy tftp flash" within TCP traffic destined for port 22 (SSH) on the home network, indicating a potential attempt to modify the router's operating system image from a TFTP server.
This rule detects attempts to retrieve the running configuration of a network device via an SSH session. It specifically looks for the case-insensitive string "show running-config" in TCP traffic destined for port 22 (SSH) on the home network, indicating a potential administrative action or reconnaissance activity.
This rule detects attempts to modify Cisco router firmware using ROMMONkit. It specifically looks for TCP traffic to the HOME_NET on port 23 (Telnet) containing the case-insensitive strings "rommon" and "tftpdnld". This combination suggests an attempt to interact with the router's ROM Monitor mode for firmware manipulation, often associated with malicious activities like installing backdoors or persistent malware.
Monitors Cisco Catalyst SD-WAN Controller logs for successful administrative logins. This may indicate exploitation of an authentication bypass vulnerability granting unauthorized admin access.
Cisco Dot1x Disabled
Sigma
Detects the manual disablement of IEEE 802.1X (dot1x) on a Cisco network device interface.
Disabling dot1x bypasses Network Access Control (NAC) mechanisms, potentially allowing unauthorized devices to gain access to the internal network.
This activity is a common technique used by attackers or malicious insiders to establish persistence or perform lateral movement via rogue devices.
Disabling dot1x bypasses Network Access Control (NAC) mechanisms, potentially allowing unauthorized devices to gain access to the internal network.
This activity is a common technique used by attackers or malicious insiders to establish persistence or perform lateral movement via rogue devices.
Show when private keys are being exported from the device, or when new certificates are installed
Turn off logging locally or remote
Detects when a successful MFA authentication occurs due to the use of a bypass code.
A bypass code is a temporary passcode created by an administrator for a specific user to access a Duo-protected application. These are generally used as "backup codes," so that enrolled users who are having problems with their mobile devices (e.g., mobile service is disrupted, the device is lost or stolen, etc.) or who temporarily can't use their enrolled devices (on a plane without mobile data services) can still access their Duo-protected systems.
A bypass code is a temporary passcode created by an administrator for a specific user to access a Duo-protected application. These are generally used as "backup codes," so that enrolled users who are having problems with their mobile devices (e.g., mobile service is disrupted, the device is lost or stolen, etc.) or who temporarily can't use their enrolled devices (on a plane without mobile data services) can still access their Duo-protected systems.
Cisco Clear Logs
Sigma
Clear command history in network OS which is used for defense evasion
Cisco File Deletion
Sigma
See what files are being deleted from flash file systems
Detects BGP failures which may be indicative of brute force attacks to manipulate routing
Detects LDP failures which may be indicative of brute force attacks to manipulate MPLS labels
This rule detects potential indicators of compromise related to CVE-2026-20127 in Cisco Catalyst SD-WAN systems. It focuses on two main areas: 1) suspicious successful SSH authentications for the 'vmanage-admin' account, and 2) SD-WAN control plane connection events indicating a new 'up' state. The first part looks for specific log entries related to publickey authentication for 'vmanage-admin' from any source IP. The second part identifies control connection state changes to 'up' and extracts peer type, peer system IP, and public IP from the raw logs. The rule aims to surface events that require human confirmation by comparing them against known network designs and change records, as these events can indicate unexpected relationships between devices or unauthorized privileged access.
Monitors for command-line activity indicating the addition of SSH keys to authorized_keys files or the modification of the SSH daemon configuration to permit root login on Cisco SD-WAN devices. This is a common persistence technique used by attackers after gaining initial access, such as through CVE-2026-20127.
Detects the deletion or clearing of critical Cisco SD-WAN log files. This is a common post-exploitation technique used by attackers to cover their tracks after compromising a device, for instance, after exploiting CVE-2026-20127. The rule identifies direct file deletions and commands used to clear or truncate log file content.
Detect a system being shutdown or put into different boot mode
See what commands are being input into the device by other people, full credentials can be in the history
Cisco Local Accounts
Sigma
Find local accounts being created or modified as well as remote authentication configurations
Modifications to a config that will serve an adversary's impacts or persistence
Cisco Stage Data
Sigma
Various protocols maybe used to put data on the device for exfil or infil
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