Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects anomalous activity where users access Microsoft 365 services (SharePoint, OneDrive, Exchange) through identified anonymous proxy connections. It identifies potentially malicious exfiltration or bulk activity by flagging users who perform a high number of operations (1,000+ events) or download a significant volume of data (5GB+) within a 2-hour window.
This rule detects successful user authentication events within the environment. It acts as a base filter to capture login success, which can be further refined with context such as IP addresses or usernames to monitor for anomalous login patterns, though it does not inherently provide detection of complex attacks like session token hijacking on its own.
This rule detects potentially malicious or automated data access patterns within Microsoft 365 or similar cloud environments. It identifies user accounts or applications that exhibit a high volume of file/email access operations across a diverse set of paths, which is often indicative of automated data exfiltration, scraping, or suspicious collection by a compromised identity.
Detects anomalous data access or collection activity across multiple M365 workloads (SharePoint, OneDrive, Exchange). The rule identifies users exhibiting high volumes of file or mail access across at least two distinct workloads within a one-hour window, which may indicate account compromise, bulk data exfiltration, or unauthorized persistence via mailbox rules.
Detects a suspicious sequence of events where a user's password is changed or reset by an administrator (or help-desk role) followed within a short time window by that same user registering a new MFA device, potentially indicating a vishing-based account takeover attack (e.g., PREY-0058/UNC6671).
Detects the execution of msiexec.exe referencing a 'Temp.txt' file located within the user's AppData Local Temp directory, which matches a known suspicious file hash. This pattern often indicates an attempt to proxy the execution of malicious payloads via the Windows Installer utility.
Detects the execution of msiexec.exe referencing a 'Temp.txt' file located within the user's AppData Local Temp directory, which matches a known suspicious file hash. This pattern often indicates an attempt to proxy the execution of malicious payloads via the Windows Installer utility.
Detects msiexec.exe executing from the Temp directory with suspicious command-line arguments (such as hidden windows) and spawning child processes like cmd.exe, tasklist.exe, or taskkill.exe. This behavior is often indicative of malicious installation scripts attempting to perform discovery or terminate security processes while remaining stealthy.
This rule detects instances where a process named 'wsc_updata.exe' executing from a Temp directory loads a library named 'wsc.dll'. This behavior is characteristic of DLL side-loading or DLL hijacking, where a malicious or potentially unwanted executable attempts to load a library from a user-writable directory to execute arbitrary code.
Detects evidence of the MovieReaper loader technique. This behavior involves registering or rewriting Vectored Exception Handlers, allocating memory with EXECUTE_READWRITE protection, and triggering debug-break exceptions to redirect execution into raw NtProtectVirtualMemory syscalls, effectively bypassing user-mode API hooks often used for monitoring.
Detects evidence of the MovieReaper loader technique. This behavior involves registering or rewriting Vectored Exception Handlers, allocating memory with EXECUTE_READWRITE protection, and triggering debug-break exceptions to redirect execution into raw NtProtectVirtualMemory syscalls, effectively bypassing user-mode API hooks often used for monitoring.
Detects evidence of the MovieReaper loader technique. This behavior involves registering or rewriting Vectored Exception Handlers, allocating memory with EXECUTE_READWRITE protection, and triggering debug-break exceptions to redirect execution into raw NtProtectVirtualMemory syscalls, effectively bypassing user-mode API hooks often used for monitoring.
Detects execution artifacts of the MovieReaper stage 2 implant, specifically its capability to parse and load COFF modules into memory without writing them to disk. The rule monitors process command lines for 'module_init' and identifies suspicious API activity related to memory-based module loading, such as reflective DLL loading or remote thread creation.
Detects PowerShell command execution that uses bitwise XOR operations combined with the .NET [IO.File]::WriteAllBytes method. This pattern is commonly used by malware, such as AsyncRAT, to deobfuscate and drop secondary payloads or modules onto the file system during execution.
Detects post-exploitation persistence artifacts on Windows endpoints consistent with abuse of CVE-2026-18577.
Detects anomalous or high-volume activity related to Microsoft Graph API calls targeting email messages, mail folders, or attachments. This behavior is indicative of potential unauthorized bulk email collection or exfiltration attempts, often observed in account compromise scenarios where an attacker enumerates and downloads mail contents.
Detects anomalous or high-volume activity related to Microsoft Graph API calls targeting email messages, mail folders, or attachments. This behavior is indicative of potential unauthorized bulk email collection or exfiltration attempts, often observed in account compromise scenarios where an attacker enumerates and downloads mail contents.
Detects suspicious reconnaissance or modification activity within Microsoft Graph API by identifying high volumes of requests targeting sensitive management endpoints (such as directory roles, authentication methods, service principals, or OAuth permissions) from a single actor within a 30-minute window.
Detects HTTP traffic that contains an abnormal number of nested encoding layers, which is often used by attackers to evade network-based inspection signatures and WAF filters.
Detects the loading of WMI-related DLLs (wbemcomn.dll, wbemprox.dll) by processes that are commonly abused to proxy execution (LOLBins) such as certutil, mshta, or office applications. This behavior is often associated with WMI-based persistence or execution techniques.
Detects execution of rundll32.exe with command-line arguments involving 'DavWWWRoot' and external domains ('pf.ch' or 'verification.google'), which is characteristic of attempts to force remote WebDAV authentication or execute malicious code via network-hosted resources.
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