Duo Tech
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This rule monitors network traffic for DNS queries and HTTP requests directed toward known malicious domains associated with phishing campaigns, specifically those leveraging OAuth device code authorization flows (e.g., /devicelogin, /deviceauth) and credential harvesting sites.
Detects Microsoft Entra ID (formerly Azure AD) device registration, ownership assignment, or user assignment operations where the device display name matches a suspicious naming pattern, specifically 'GraphSpy-Device'. This naming convention is often associated with the GraphSpy tool, which is used by adversaries to enumerate and manipulate Entra ID resources, including registering rogue devices to bypass conditional access or MFA.
Detects the execution of 'sudo' or 'systemd-run' with specific flags often associated with automated credential processing or service creation for privilege escalation. The rule monitors for sudo commands using '-S' (read from stdin) and '-p' (custom prompt) flags, which are common in non-interactive scripts attempting to bypass or manipulate password prompts, and systemd-run commands using '--system' and '--no-ask-password', which can be used to run commands as root without interactive authentication.
Detects Python processes attempting to execute shellcode in-memory by invoking Windows Fiber APIs (CreateFiber, ConvertThreadToFiber, SwitchToFiber) in conjunction with memory allocation via VirtualAlloc. This pattern is commonly used in fileless execution techniques where shellcode is manually managed within the process address space, bypassing standard process creation mechanisms.
Detects the use of mshta.exe to execute code directly from a remote URL that includes a numeric path segment. This behavior is often associated with the retrieval of HTA, VBScript, or JScript payloads from attacker-controlled servers, where the numeric path may indicate a versioned payload or a specific exploit delivery mechanism.
Detects high-frequency Resource Owner Password Credentials (ROPC) authentication requests targeting the OAuth token endpoint. Attackers use ROPC for brute-forcing, credential stuffing, or bypassing security controls by directly passing user credentials to the OAuth flow.
Detects the use of PowerShell to modify file timestamps by using the timestamps of the legitimate notepad.exe as a reference point. This technique is often used to make malicious files blend in with system files by adopting their creation, access, or write times.
Detects the execution of rundll32.exe attempting to load a DLL from a remote WebDAV share by monitoring for the '@ssl' notation in the command line. This technique is often used to execute malicious code or load DLLs from attacker-controlled remote infrastructure, bypassing local security controls.
Detects the use of the 'pushd' command in combination with a WebDAV share path utilizing the '@SSL' notation. This technique can be used by attackers to force the connection to a remote WebDAV share, potentially triggering NTLM credential relay or accessing malicious remote resources. The inclusion of 'rundll32' in the condition suggests monitoring for process proxying or exploitation chains often associated with such connections.
Detects periodic, repetitive TLS network connections from internal hosts to external destinations using threshold-based analysis. This pattern is indicative of potential command-and-control (C2) beaconing, which may be used for exfiltrating stolen credentials or sensitive data from build or developer environments.
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