Duo Tech
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2,481 detections
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Detects instances where the WLDR Agent attempts to execute code via 'Start-ModuleJob' and subsequently hits an error condition, forcing a fallback to native PowerShell 'Start-Job' cmdlets. This pattern of falling back from a specialized execution environment to standard, potentially less-monitored, background jobs can indicate an attempt to bypass existing runspace restrictions or execution policies.
This rule detects the presence of Remcos Remote Access Trojan (RAT) by matching known malware family signatures identified by antivirus software. Remcos RAT is frequently used by adversaries for unauthorized system control, data exfiltration, and surveillance.
Detects short-window spikes in Entra sign-in/token-request event volume (exceeding roughly 100,000-250,000 events within a single day per tenant), consistent with automated client-ID-spoofed ROPC enumeration campaigns that exhibit a multi-day burst-then-quiet cadence.
Detects sign-in activity in Entra ID where the application display name is blank, despite an Application ID being present, originating from known cloud service provider IP ranges (AWS or Cloudflare). This pattern is consistent with automated enumeration or discovery tools that leverage OAuth client ID spoofing or misconfigurations to identify valid tenants or users.
Detects specific URI patterns associated with the DEBULL (also known as CloakGuard) Phishing-as-a-Service (PhaaS) platform. These URI paths are commonly used by attackers managing phishing campaigns, including administrative authentication or deployment script execution on compromised infrastructure acting as a phishing panel.
Detects HTTP POST requests containing 'poll_auth_broker_token' and 'device_code' parameters, which are characteristic of malicious OAuth 2.0 device authorization grant flows commonly used in phishing campaigns.
This rule detects HTTP POST requests to known phishing domains (frenksv.sbs, debull.app) which include specific parameters indicative of an attempt to initiate the OAuth 2.0 device authorization grant flow ('get_auth_broker_device_code'). This pattern is associated with phishing campaigns aiming to hijack a user's session by tricking them into authorizing a malicious application, eventually leading to the theft of application access tokens.
Detects creation of a hardcoded mutex object used by the WLDR C2 implant to enforce single-instance execution and prevent duplicate agent processes.
Detects instances where browser-related credential files (Login Data, Cookies, cookies.sqlite) are accessed by processes that are not the associated web browsers. This behavior is indicative of credential theft or dumping, where unauthorized processes attempt to read sensitive browser data to extract stored credentials, cookies, or session tokens.
Detects inbound emails with document-related subjects that contain links to the systeme.io platform, which are subsequently clicked and redirected to a different destination. This pattern is commonly used in phishing campaigns to bypass initial security inspection by leveraging reputable hosting platforms as a redirector.
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