Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
461 detections
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Detects the execution of 'curl.exe' with command-line arguments indicating the use of SOCKS proxies (socks5h, socks5, socks4a) and targeting '.onion' domains. This combination is highly indicative of activity associated with the Kalambur backdoor, which leverages TOR for command and control.
This rule detects the installation or execution of a wide range of common third-party VPN clients by monitoring process creation events. It specifically looks for process names associated with over 100 different VPN services. The rule includes exclusions for legitimate security software like Microsoft Defender and Microsoft Intune Agent, as well as Cisco AnyConnect VPN client installations.
This rule detects successful or failed logon attempts originating from IP addresses identified by threat intelligence as associated with botnets, command and control (C2) infrastructure, or proxies. The rule specifically looks for 'LogOn' or 'FailedLogOn' activity types where the source IP's threat intelligence indicator type is 'Botnet', 'C2', or 'Proxy', and where activity insights are available.
Detects the execution of NetCat (nc) on macOS systems. NetCat is a versatile networking utility that can be used for various purposes, including port scanning, banner grabbing, file transfers, and creating backdoors. This rule specifically looks for process creation events where the process name is 'nc' and excludes known legitimate uses by 'Jamf Connect' and 'TruU Authenticator', as well as a specific health check script.
This analytic detects the use of `curl.exe` with insecure flags such as `-k`, `--insecure`, `--proxy-insecure`, or `--doh-insecure` which disable TLS certificate validation. It leverages Cisco Network Visibility Module (NVM) flow data and process arguments to identify outbound connections initiated by curl where TLS checks were explicitly disabled. This behavior may indicate an attempt to bypass certificate validation to connect to potentially untrusted or malicious endpoints, a common tactic in red team operations, malware staging, or data exfiltration over HTTPS.
This rule detects the Linux_Backdoor_PondRAT malware by identifying specific byte patterns associated with its 'connect_proxy', 'send_payload', and 'execute_shell_command' functions. The rule targets ELF executables.
Detects VenomRAT, a variant of QuasarRAT, used by the RevengeHotels group in recent campaigns targeting the hospitality industry. This rule identifies the RAT based on a characteristic list of security and analysis tools it attempts to terminate, along with other unique features.
Detects a LOLBAS (Living Off the Land Binary) executing a payload from a common staging directory, which is then followed by an outbound RDP connection from the same process. This behavior is indicative of a proxied RDP connection, often used for lateral movement after an initial compromise, as seen with malware like SystemBC.
Detects scenarios where an attacker configure port forwarding on a host to redirect traffic to a C&C target.
Detects scenarios where an attacker attempts to modify proxy configuration in order to bypass network restrictions.
This KQL query detects network traffic to or from suspicious ports by joining firewall logs (CommonSecurityLog) with an external, regularly updated list of known suspicious ports. It specifically looks for accepted or passed connections to these ports, indicating potential exploitation attempts or unauthorized communication channels used by threat actors.
Ngrok is a legitimate tool that creates secure tunnels to localhost servers through NAT/firewalls, often used by developers.
Additionally, Ngrok tunnels have been used by Iranian APT groups, among others, to support their operations particularly for Command and Control (C2), data exfiltration, and initial access staging.
Additionally, Ngrok tunnels have been used by Iranian APT groups, among others, to support their operations particularly for Command and Control (C2), data exfiltration, and initial access staging.
Detects the execution of suspicious commands commonly used for reconnaissance or networking, where the parent process command indicates it was triggered by an npm 'postinstall' script. This behavior is associated with the XORIndex loader used in the "Contagious Interview" campaign.
This rule detects potential proxy bypass attempts by identifying network connections on common web ports (80, 443) that are allowed by the network firewall but do not appear in the proxy logs. It correlates network traffic from the Network_Traffic data model with proxy traffic from the Web data model. The rule specifically filters for external-bound traffic by excluding private and multicast IP addresses.
Detects the creation of the Tor process from a specific directory using command line arguments indicative of controlling and logging ports.
KQL Query from file: Exploring M365 Accounts Investigation
KQL Query from file: Remote code execution exploit chain in OpenVPN
KQL Query from file: Multi-Cloud DefenderXDR KQL Threat Detection
KQL Query from file: Check for Azure Outdated Security Protocols
KQL Query from file: Hunting Aqua Blizzards
Detects an executable initiating a network connection to "ngrok" tunneling domains.
Attackers were seen using this "ngrok" in order to store their second stage payloads and malware.
While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download.
Attackers were seen using this "ngrok" in order to store their second stage payloads and malware.
While communication with such domains can be legitimate, often times is a sign of either data exfiltration by malicious actors or additional download.
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