Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects a sequence of events where PowerShell is used to download files from 'nvidiadriver.net' or with filenames containing 'winPatch', followed by a suspicious file drop (specifically 'winPatch.zip' or 'update.vbs') in a temporary directory within a 30-minute window. This behavior is indicative of potential initial staging for a RAT or malicious script deployment.
Detects the execution of PowerShell with suspicious download-related commands (Invoke-WebRequest, DownloadFile, WebClient, IEX, DownloadString) when initiated through conhost.exe, specifically when the originating parent process is a common shell or utility associated with shortcut (.lnk) file execution or specific command patterns.
This rule detects activity associated with a known malicious campaign involving 'Photo ZIP' themed lures. It identifies DNS queries to actor-controlled domains, the spawning of PowerShell by Explorer.exe with command lines referencing photo-related filenames or external file-sharing services, and the subsequent downloading of the node.exe runtime to user-accessible directories (consistent with TonRAT delivery).
Detects instances where explorer.exe launches a PowerShell process originating from an LNK file, which then performs a remote download of a Node.js runtime and JavaScript implant (TonRAT) to standard Windows temporary or application data directories. This activity is indicative of the TonRAT campaign targeting hospitality front-desk systems.
Detects download, execution, and network activity associated with the 'isp.sh' dropper script. This includes the use of common utilities like curl or wget to fetch the script from a specific C2 IP address (83.142.209.214), piping the script directly to a shell, and signs of secondary payload execution such as 'lambsys'.
Detects potential financial data exfiltration by monitoring for bulk downloads of files with financial keywords from SaaS/Office365 platforms, and identifies unauthorized processes attempting to access sensitive financial application data files (.qbw, .qbb, etc.) on local systems.
Detects programmatic file downloads from SharePoint and OneDrive using automation tools like PowerShell, PnP, Graph SDK, Python, Node.js, or generic CLI tools (curl, wget) rather than typical browser access. This can indicate data exfiltration.
Detects a self-extracting 7-Zip archive that exhibits characteristics of a downloader, specifically looking for the presence of '7-Zip' strings, WinINet API calls ('WinINet', 'InternetReadFile') for downloading, and 'CreateProcessW' for launching child processes. It also looks for the string 'AppData\Local\Programs', which could indicate an installation path. The rule targets executable files (MZ header).
Detects the use of the built-in Windows utility 'certutil.exe' with arguments commonly used to download remote content (-urlcache -split -f) or decode base64 encoded files (-decode, -decodehex), when the output or operation occurs within temporary system directories such as Temp, AppData, or ProgramData, and the process is not signed by Microsoft.
Detects the use of the BITSAdmin command-line utility to initiate file transfers from external sources to user-writable directories or temporary folders. This behavior is indicative of living-off-the-land (LotL) techniques where adversaries use legitimate system binaries to download and potentially execute malicious files.
Detects the use of BITSAdmin or PowerShell 'Start-BitsTransfer' to initiate file transfers, specifically targeting non-Microsoft signed processes. Adversaries often abuse the Background Intelligent Transfer Service (BITS) to download malicious payloads or exfiltrate data, as it is a legitimate Windows service that operates in the background.
Detects potential browser fingerprinting and network reconnaissance behavior associated with Bluekit BitM PhaaS campaigns. The rule correlates large suspicious JavaScript file downloads (excluding common CDNs) with STUN server connectivity within a 10-minute window, a pattern often used by adversary-in-the-middle (AiTM) frameworks to fingerprint victims and establish WebRTC channels.
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 the abuse of Windows Background Intelligent Transfer Service (BITS) via 'bitsadmin.exe' or PowerShell's 'Start-BitsTransfer' cmdlet to download files from remote URLs. This rule identifies potentially malicious activity by monitoring for specific transfer-related command-line arguments coupled with external network connections, excluding Microsoft-signed processes. It further refines detection by flagging output to suspicious directories (like Temp, AppData, or Public) or files with common executable extensions.
Detects usage of the Windows certutil.exe binary to perform potentially malicious operations such as downloading files via URL cache or decoding base64/hex payloads. The rule specifically alerts when these actions occur within common user-writable or temporary directories often used by threat actors for file staging.
Detects the use of certutil.exe to download files from a remote URL using the -urlcache or -split flags. This behavior is a common Living-off-the-Land (LotL) technique used by adversaries to bypass security controls and download secondary payloads.
Detects thousands of OneDrive or SharePoint file downloads by a single account during a short period, indicating automated collection rather than ordinary user activity.
This rule detects the use of BITSAdmin to transfer files from a remote HTTP/HTTPS source where the downloaded file has a common arbitrary extension (txt, dat, bin, jpg) but is being renamed to a .dll extension. This technique is often used by adversaries to stealthily download secondary loaders or malicious DLLs.
Detects curl or wget fetching a secondary payload (like AMOS or ClearFake) directly into the /tmp directory, a volatile location to hide execution artifacts. The rule specifically looks for command-line arguments that use '-o' to specify a destination path within /tmp with common executable or package extensions.
Detects user execution of malicious files downloaded via email link clicks
This rule monitors for network connections to a specific remote IP (62.171.185.97) associated with suspicious activity. It flags connections involving specific high-risk ports, the use of Wget/1.18 for user agents, or access to the '/pwned' URL path, which are common indicators of automated attack tools or post-exploitation activity.
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