Shadows VMB
@Vemorian_MortTrusted contributorCompletionist
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122 detections
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This rule detects potential Command and Control (C2) beaconing activity by identifying periodic outbound network connections from suspicious or non-browser processes. It analyzes the time deltas between successful network connections; if the standard deviation of these intervals is low (indicating consistent timing) and a sufficient number of connections occur, it flags the behavior as a potential C2 heartbeat.
Detects instances where a shell process (powershell, cmd, mshta, or wscript) is spawned by a browser-related process (explorer, wt, or SearchHost) shortly after a user focuses on a web browser, followed by a network connection from that shell within a short time window. This pattern is indicative of potential web-based exploitation or file download and execution chains.
Detects the execution of command interpreters (PowerShell, CMD, WindowsTerminal) spawned by common user-facing applications (Explorer, WindowsTerminal, DLLHost) where the command line arguments contain keywords associated with automated human verification (e.g., CAPTCHA, bot detection) and suspicious download/execution patterns (e.g., iex, base64). This behavior is characteristic of malicious automated scripts or malware attempting to bypass security challenges via interactive shells.
Detects instances where a single account adds a large volume of users (over 50) to a Microsoft Teams chat within a one-hour window. This behavior could indicate automated activity, potential bulk addition by an attacker to facilitate phishing or spam, or unauthorized group modifications.
Detects the presence of Chrome Remote Desktop processes or execution of Windows Installer (msiexec.exe) and GoogleUpdate.exe, which are often used by adversaries for remote access or as a proxy for malicious payload execution.
Detects the installation of common remote access tools (such as TeamViewer, AnyDesk, or ScreenConnect) followed by an external network connection within a 10-minute window, which may indicate unauthorized remote access setup.
Detects instances where the OneDrive sync client process creates files on drives other than the system drive (e.g., D: drive and beyond). This pattern is often used to identify potentially suspicious file synchronization activities or the use of secondary storage locations that may deviate from baseline OneDrive configurations.
Detects instances where common web browsers (Chrome, Edge, Firefox, IE) download executable or compressed files to drives other than the C: drive. This behavior may indicate an attempt to evade standard security monitoring or hide malicious payloads on secondary volumes or removable media.
This rule correlates Microsoft Entra ID (formerly Azure AD) identity risk events with sign-in activity and behavioral analytics for a specific user to facilitate forensic investigation of potential identity compromise. It aggregates risk events, anomalous sign-in attempts (including failures or failed conditional access), and suspicious behavioral telemetry from the same source IP addresses associated with identified user risk.
This rule detects potential data exfiltration by monitoring write activity to external USB storage devices. It identifies scenarios where a high number of files (more than 25) or a significant total volume of data (more than 100MB) is written to a connected USB device within a short timeframe.
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