Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
292 detections
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Monitors Cisco SD-WAN (vManage, vBond, vSmart) appliance logs for authentication events against management accounts. It specifically identifies logins from known malicious IP addresses associated with threat actor activities and flags anomalous authentication methods such as PAM/keyboard-interactive and unvalidated administrative access.
Detects RemotePC RMM software (REMOTEPCSERVICE.EXE / RPCCMDHOST.EXE) spawning PowerShell with hidden window and IEX download cradle, consistent with Prinz Eugen ransomware group using RemotePC as a persistence and C2 channel.
Identifies logins from geographically distant locations occurring faster than physically possible, highlighting proxy infrastructure. This KQL query analyzes Google Workspace login success events, grouping them by account and a 10-minute time window. It then filters for instances where an account has successfully logged in from two or more distinct locations within that short timeframe, indicating potential impossible travel.
Detects network connections to known C2, VPS, VPN, and Starlink IP addresses and ranges used by the Handala group (Void Manticore) for their operations.
Detects unauthenticated ServiceNow Scripted REST Resource access attributed to Guest user or known attacker IP 51.159.98.241
Detects rapid non-interactive sign-ins utilizing refresh tokens from known VPS hosting providers. This rule identifies a high volume of successful non-interactive sign-ins (more than 20 within a 10-minute window) from a single user and IP address, indicating potential abuse of refresh tokens, possibly from a compromised cloud VPS.
Detects unauthorized GlobalProtect VPN logins from known malicious IPs.
This rule detects suspicious sign-in attempts to Azure AD where Conditional Access policies were not applied, the sign-in was successful, and the user agent string indicates a bot, crawler, headless browser, or common scripting tools like curl, wget, or python. It specifically looks for multiple such logins or logins from multiple unique devices within a 5-minute window for the same user and risk detail.
This rule detects suspicious sign-in attempts to Azure AD where Conditional Access policies were not applied, the sign-in was successful, and the user agent string indicates a bot, crawler, headless browser, or common scripting tools like curl, wget, or python. It specifically looks for multiple such logins or logins from multiple unique devices within a 5-minute window for the same user and risk detail.
Correlates Windows 365 or Citrix client execution with network share discovery commands by the same account on the same device within thirty minutes. This rule detects potential post-compromise activity where an attacker might be using a VDI session to enumerate network shares.
Detects unauthorized GlobalProtect VPN logins from known malicious IPs.
This detection identifies when an email that contains a URL associated with a known Remote Monitoring and Management (RMM) tool was sent and subsequently clicked by the intended recipient or the original sender. The domain is not part of the organization's approved RMM solutions, indicating a potential use of Living-off-the-Land RMM (LOLRMM) techniques often employed in initial access or persistence stages by threat actors.
This activity may reflect attempted remote access, lateral movement, or data collection through unauthorized RMM deployment.
This activity may reflect attempted remote access, lateral movement, or data collection through unauthorized RMM deployment.
This rule detects suspicious activity where a user successfully performs a multi-factor authentication (MFA) device login to Microsoft Office 365 via a browser, and within a 15-minute window, the same user either creates a new inbox rule or adds a new device. This combination of events could indicate an adversary gaining initial access and then setting up persistence (e.g., forwarding emails) or further device enrollment.
Detects remote service connections originating from external internet addresses
This rule detects RDP access attempts from external IP addresses to the internal network ($HOME_NET) on port 3389. It uses a threshold of 3 connection attempts within 300 seconds from the same source IP to trigger an alert, indicating potential brute-force or reconnaissance activity targeting RDP services. The rule is classified under the MITRE ATT&CK technique T1133, which involves 'Remote Desktop Protocol' for initial access.
This rule detects an attempt to establish a VNC (Virtual Network Computing) connection from an external source to a host within the protected network. It specifically looks for TCP SYN packets (initial connection attempt) destined for common VNC ports (5900-5910) on the home network. This could indicate an attacker attempting to gain remote access to internal systems.
Detects if a new connector is registered on Azure AD; Azure AD Application Proxy is a feature of Microsoft Entra that allows you to securely publish on-premises applications to remote users. This is particularly useful for organizations that need to provide access to internal applications without exposing them directly to the internet.
Detects inbound network connections from external, non-private IP addresses to local ports 6081 and 6082. These ports are used by the PAN-OS User-ID Authentication Portal, which is actively targeted by CVE-2026-0300.
Detects inbound network connections from external, non-private IP addresses to local ports 6081 and 6082. These ports are used by the PAN-OS User-ID Authentication Portal, which is actively targeted by CVE-2026-0300.
Detects instances where an SSH service on an OpenCanary node has had a connection attempt.
Detects instances where a Telnet service on an OpenCanary node has had a login attempt.
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