Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects Notepad.exe initiating outbound network connections, specifically over SMB (port 445) or to public IP addresses over HTTP/S. This behavior is highly anomalous and can indicate an attempt to exploit a vulnerability (e.g., CVE-2026-20841) to trigger an NTLM relay attack for credential harvesting or to download a remote payload.
Detects command-line execution containing keywords associated with Guloader (e.g., 'guloader', 'gupl') or generic download indicators (e.g., 'download' combined with protocol identifiers like 'http', 'https', 'ftp'). This typically indicates the malicious downloading of payloads by the Guloader malware family.
This rule detects the execution of PowerShell, wscript, or cscript with command-line arguments containing "Invoke-WebRequest" or "curl" in conjunction with specific keywords like "guloader", "etherhiding", or "clickfix". This combination suggests an attempt to download or execute malicious payloads associated with these campaigns or malware families.
Detects a multi-stage execution chain where PowerShell is used to download or reference the portable WinPython environment (WPy64-31401), followed by the execution of pythonw.exe within that context, which is indicative of the ModeloRAT malware.
Detects delivery of macro-enabled Office documents via email clients
Detects the use of PowerShell with 'Invoke-WebRequest' to download trojanized installers (MicrosoftEdgeSetup.exe, ChromeSetup.exe, MSTeamsSetup.exe) from malicious domains like 'apple-online.shop' or 'trycloudflare.com', as observed in Interlock activity leveraging JunkFiction.
Detects PowerShell, mshta, or curl writing an executable, DLL, or script beneath a hidden-looking AppData directory. This behavior is often associated with malware staging or persistence.
EchoCreep Downloads a Tool
Cortex XDR
Detects the curl utility being launched by processes associated with EchoCreep or similar backdoor activity (searchapp, service, update, cmd) to download files, indicated by the use of output flags (-o, --output, -L, --remote-name). This activity is indicative of an adversary establishing persistence or downloading additional tools after initial compromise.
This rule detects a scenario where a user downloads a fake installer (e.g., setup, install, vpn executable) from a browser, and shortly after, the downloaded executable initiates a PowerShell process. This PowerShell process then attempts to fetch secondary payloads from known malicious hosting services like Discord or Pastebin using `Invoke-WebRequest` or `IEX`.
Detects the use of bitsadmin.exe or certutil.exe to download and install legitimate Remote Monitoring and Management (RMM) tools like ConnectWise Control. This activity is often associated with adversaries establishing persistent graphical access after initial compromise, as observed in campaigns like Storm-1175.
This rule detects network activity involving connections to known malicious IP addresses or DNS domains ('govtop.one') and subsequent attempts to download specific suspicious file payloads, such as archives or image files often associated with malicious activity. This activity is indicative of potential command and control communication or initial malware ingress.
Identifies the first-stage script downloading the Mach-O binary payload directly into /tmp/helper or /tmp/update using 'curl'.
Detects malicious multi-stage download behavior where a web browser spawns PowerShell to initiate an outbound network connection, characteristic of the 'ErrTraffic' Beer cluster often associated with ClickFix infection lures delivering malware such as DanaBot, Stealc, HijackLoader, SmokeLoader, or Vidar.
Detects a multi-stage execution pattern involving cmd.exe spawning PowerShell to download files from storjshare.io using System.Net.WebClient, followed by a secondary PowerShell execution using 'Start-Process -Verb RunAs' to trigger a UAC bypass, characteristic of the REF8372 campaign and OXLOADER distribution.
Detects a suspicious pattern consistent with the REF8372 OXLOADER malware delivery, where a batch file (BAT) is executed from the Downloads or Temp directories using cmd.exe, which then spawns PowerShell to download external content from link.storjshare.io.
Detects execution of PowerShell commands originating from a batch (.bat/.cmd) script that utilize .NET WebClient methods (DownloadString/DownloadFile) combined with process execution cmdlets (Start-Process/Invoke-Expression/IEX). This pattern is associated with the delivery and execution of the OXLOADER malware via BATPackageBuilderSetup.bat.
This rule detects the download of a standalone Python build for Apple Darwin from astral-sh/python-build-standalone on GitHub using 'curl', followed by its extraction using 'tar'. This activity could indicate a developer setting up a specific Python environment or potentially a malicious actor introducing a custom Python interpreter.
Detects an end-user web browser downloading an .rdp (Remote Desktop Protocol) configuration file, a primary lure for Terminal Server phishing.
Detects PowerShell downloading an archive and expanding it into a user-writable directory with mining-related filenames or parameters.
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 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.
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