Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
292 detections
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Flags individual authentication events against services WaterPlum/North Korean IT worker operations are known to touch (laptop-farm remote-access tooling, freelance/crowdsourcing platforms, job-application and recruitment portals). This rule matches on a SINGLE qualifying event and does not itself prove IP reuse across contexts -- this Sigma dialect has no native cross-event correlation construct, so confirming that the SAME source IP appears across two or more of these categories (the actual WaterPlum indicator reported by investigators) requires a downstream correlation search, SOAR playbook, or UEBA rule that groups these flagged events by SourceIp over a rolling window.
This rule detects anomalous authentication behavior on SonicWall VPN appliances characterized by either multiple distinct source IP addresses for a single user or a high volume of failed authentication attempts followed by a successful login. These patterns are often indicative of credential stuffing or password spraying campaigns, such as those observed in Akira ransomware affiliate initial access activities.
Detects signs of Android Wireless Debugging being enabled and potentially leveraged, including the toggle of the ADB_WIFI_ENABLED setting, pairing code generation, accessibility interactions confirming pairing, and the instantiation of a TCP listener by the adbd process.
Detects a malicious chain of events on Android devices, likely attributed to the RatHat malware, where the 'SystemHelperService' abuses Accessibility Services to programmatically enable Developer Options and Wireless Debugging. It further monitors for the capture of a 6-digit pairing code to facilitate unauthorized local ADB self-pairing.
This rule monitors for network connections, firewall traffic, and Entra ID authentication events involving known malicious IP addresses (the 'Wall of Shame'). The rule specifically flags interactions occurring over common VPN ports, suggesting potential unauthorized access or persistence attempts via VPN services.
This rule detects attempts to exploit a path traversal vulnerability (CVE-2024-21762) in FortiOS SSL-VPN by monitoring for malformed GET requests targeting the /remote/fgt_lang endpoint. The rule also tracks successful exploitation by identifying HTTP 200 responses containing Linux password file patterns (root:x:0:0:), indicating potential remote file disclosure.
Detects anomalous remote access or VPN login activity for a user account, characterized by either logins from multiple distinct countries or logins occurring during off-hours (between 8:01 PM and 5:59 AM). This rule helps identify potential credential abuse where valid accounts are being leveraged from unexpected locations or times.
Detects repeated authentication attempts over PPTP (port 1723) or L2TP (port 1701) protocols originating from an external network, indicative of potential brute-force activity against remote access services.
Detects anomalous configuration of Android devices by identifying instances where an accessibility service is granted combined with the enabling of wireless ADB debugging or ADB pairing code extraction. This behavior is often associated with malicious applications seeking unauthorized control or remote access to the device.
Detects successful VPN authentication events targeting SonicWall devices during non-business hours (between 20:00 and 06:00, or on weekends). This behavior is characteristic of initial access tradecraft often employed by ransomware affiliates to gain network entry with minimal operational noise.
Detects successful remote authentication events originating from an external source IP address via a SonicWall SSL-VPN, as identified by relevant login fields. This rule serves as a proxy for identifying initial access attempts often associated with ransomware activity, such as Akira, which leverage compromised VPN credentials.
Detects repeated authentication attempts over PPTP (port 1723) or L2TP (port 1701) protocols originating from an external network, indicative of potential brute-force activity against remote access services.
Detects network activity related to the exploitation of Dahua P2P relay services via easy4ipcloud.com. The rule monitors for unauthorized device probing, serial number enumeration, and illicit relay authentication attempts (e.g., using DHP2P protocols and X-WSSE authentication), which are indicative of attackers attempting to abuse IoT device remote access functionality (CVE-2025-31702).
Detects network activity related to Dahua P2P relay services (easy4ipcloud.com) on port 8800. The rules monitor for device lookup queries (/online/p2psrv/), probe requests (/probe/device/), and the presence of WSSE authentication headers, which may indicate interaction with or exploitation attempts by tools targeting P2P-enabled surveillance hardware.
This rule detects attempts to exploit a path traversal vulnerability (CVE-2024-21762) in FortiOS SSL-VPN by monitoring for malformed GET requests targeting the /remote/fgt_lang endpoint. The rule also tracks successful exploitation by identifying HTTP 200 responses containing Linux password file patterns (root:x:0:0:), indicating potential remote file disclosure.
This rule identifies installations of Parallels Desktop on Intel-based macOS devices that are within the 26.x version branch and have not been updated to the 27.0.0 fix. It utilizes software inventory and device information to alert on systems running vulnerable software susceptible to exploitation.
This rule detects high-frequency TCP SYN connection attempts originating from external networks targeting common administrative or tunneling ports (1723/PPTP, 1701/L2TP, 22/SSH) on internal systems. The detection uses a threshold of 100 connection attempts within 120 seconds, which is characteristic of automated reconnaissance and network scanning behavior.
This rule detects a sequence of authentication activity on VPN gateways (Palo Alto, Fortinet, Cisco) where a source IP experiences multiple failed login attempts followed by at least one successful login within a 60-minute window, potentially indicating a successful brute force or password spraying attack.
Detects a pattern of multiple failed authentication attempts (brute force) from an external IP address followed by a successful authentication event on remote access services such as RDP, VPN, or NTLM. The rule filters for non-private IP addresses and flags successes occurring outside of standard business hours.
Detects successful user authentication events originating from an external source IP address. This rule is intended to identify remote logins that can be correlated with RMM (Remote Monitoring and Management) activity or other remote access patterns.
This rule identifies installations of Parallels Desktop on Intel-based macOS devices that are within the 26.x version branch and have not been updated to the 27.0.0 fix. It utilizes software inventory and device information to alert on systems running vulnerable software susceptible to exploitation.
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