Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects the creation of specific files ('Mixed Reality.exe' or 'nvdaHelperRemote.dll') within the 'C:\Program Files\Windows Media Player\' directory. This activity is a known technique used by the threat actor group associated with Operation DragonReturn (Silver Fox) to stage DLL sideloading, facilitating the persistence of malware such as DcRAT or XenoRAT.
Detects the initialization sequence of the Millenium RAT, which attempts to weaken host security by adding the entire C:\ drive as an exclusion path for Windows Defender using the Add-MpPreference PowerShell cmdlet.
Detects indicators of the DragonReturn malware campaign, specifically the download and deployment of malicious payloads hidden within image files. The rule monitors for network connections to known malicious infrastructure, the creation of specific steganographic staging files in sensitive directories, and the use of the URLDownloadToFile API to retrieve these payloads.
Detects a sequence of sensitive Windows API calls (AllocateAndInitializeSid, CheckTokenMembership, or ShellExecuteW with runas) occurring within the same process on a host. This behavior is indicative of privilege escalation attempts or unauthorized token manipulation, often observed in malicious processes attempting to elevate privileges or verify token permissions.
Detects the creation or access attempt of the specific named mutex 'Global\ShitSetupOn26126k'. This mutex is used by the DcRAT and Millenium RAT malware families as an anti-sandbox and anti-reinfection check; if the process detects this mutex exists, it self-terminates to avoid analysis or multiple infections.
Detects potential Antimalware Scan Interface (AMSI) bypass attempts where a process loads amsi.dll followed by suspicious memory modification operations (e.g., VirtualProtect, WriteProcessMemory) targeting the AmsiOpenSession function or the amsi.dll memory space. This is a common technique used by malware like DcRAT and various loaders to neutralize endpoint security visibility.
Detects User Account Control (UAC) bypass attempts where a registry key (e.g., ms-settings, mscfile, or Folder shell open command) is created or modified in HKCU, followed within 2 minutes by the execution of an elevated child process (High or System integrity level) by known auto-elevating binaries: fodhelper.exe, computerdefaults.exe, or eventvwr.exe.
Detects bulk process enumeration performed by suspicious or masquerading processes using Windows system APIs (CreateToolhelp32Snapshot, NtQuerySystemInformation, ProcessSnapshot). This activity is often associated with post-compromise reconnaissance and information gathering, specifically seen in Millenium RAT variants.
Detects potential User Account Control (UAC) bypass attempts where a process hijacks registry keys associated with 'ms-settings' or 'mscfile' handlers (commonly used for auto-elevating binaries) and subsequently executes an arbitrary binary from a suspicious location like AppData or Temp.
Detects a suspicious PowerShell command sequence involving network downloads to temporary directories followed by the execution of a Node.js binary from within the user's AppData directory within a 30-minute window. This behavior is indicative of a dropper pattern where a malicious script retrieves and executes a secondary stage payload.
This rule detects potential adversary activity by correlating the execution of known analysis or debugging tools (e.g., Wireshark, ProcessHacker, x64dbg) occurring within a 30-minute window of a process executing from suspicious, user-writable directories (typically AppData/Local or AppData/Roaming). This pattern is often indicative of an adversary staging tools to facilitate further analysis, reverse engineering, or credential harvesting on a compromised host.
Detects a session issued through browser MFA and subsequently used through a non-interactive, mobile, or command-line client. This behavior is indicative of an adversary potentially using a stolen session token to bypass multi-factor authentication.
Detects the payload stripping extended properties (xattr -c) to bypass macOS Gatekeeper, followed by immediate execution of the stripped file. This behavior is associated with the 'ClickFix' campaign.
Detects the use of certutil.exe to download files from remote URLs using the -urlcache flag or decode files using the -decode flag. This behavior is indicative of a living-off-the-land technique used by adversaries to fetch or prepare malicious payloads.
Detects attempts to bypass the Antimalware Scan Interface (AMSI) in PowerShell processes. This is achieved by monitoring command-line arguments for keywords associated with memory patching or reflection techniques, such as modifying AmsiScanBuffer, AmsiUtils, or interacting with amsi.dll to neutralize security scanning.
This rule detects potential DLL sideloading by identifying signed executables that load unsigned DLLs from user-writable directories, such as Temp, AppData, Downloads, or Documents. It excludes loads from standard, protected Windows directories to reduce noise.
Detects attempts to bypass the Antimalware Scan Interface (AMSI) in PowerShell processes. This is achieved by monitoring command-line arguments for keywords associated with memory patching or reflection techniques, such as modifying AmsiScanBuffer, AmsiUtils, or interacting with amsi.dll to neutralize security scanning.
Detects when a single session identifier is used to access multiple cloud applications, where at least three distinct applications are accessed within an hour, and these applications were not part of the original interactive sign-in. This behavior can indicate a token replay attack, specifically as described in the Elastic Security Labs research on Tycoon 2FA AiTM detection engineering.
Detects the use of 'attrib.exe' to modify file attributes to hidden and system for a file named 'Win.Kernel_Svc', which is indicative of the XWorm malware attempting to conceal its payload.
This rule identifies processes that trigger three or more STATUS_INVALID_PAGE_PROTECTION (0xC0000045) errors within a one-second interval. This specific behavior is caused by a recurring programming flaw in the pkr_mtsi packer, where it attempts to call NtProtectVirtualMemory with invalid memory protection constants.
This rule detects successful OAuth logins originating from IP addresses identified as residential proxies. This behavior can indicate an adversary attempting to bypass geo-blocking or other IP-based restrictions, potentially using stolen credentials (Valid Accounts) or after a successful phishing campaign (Spearphishing Link) to gain initial access or maintain persistence.
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