Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects network requests to known malicious domains associated with the fake RedAlert Android malware campaign used by pro-Iranian actors, acting as a payload host or C2 endpoint.
Detects curl commands using user-agent strings that Sapphire Sleet uses as campaign tracking identifiers in their macOS intrusion chain. Each stage of the cascading payload delivery uses a distinct UA (mac-cur1 through mac-cur5) to route requests to different server paths serving AppleScript payloads or ZIP archives containing malicious .app bundles.
Detects suspicious execution of `wget` or `curl` attempting to retrieve a payload named exactly `/.shell`. This activity is indicative of the Masjesu botnet's C2 download pattern, where it attempts to download a bash shell file after exploiting a target to initiate device infection and propagation routines.
Detects LOLBins (cmd.exe, powershell.exe, rundll32.exe, mshta.exe, etc.) spawned
directly by a web browser, indicative of FileFix or ClickFix-style social engineering
execution.
In these attacks, a malicious webpage silently copies a disguised command
to the user's clipboard; the user is then instructed to paste it into the Windows File
Explorer address bar or Run dialog, resulting in LOLBin execution under the browser's
process context.
Observed delivering loaders, RATs, and ransomware precursors in the
wild since July 2025.
Exclusions applied for Chrome Native Messaging IPC, ClickOnce
application launchers, and OAuth2/OIDC SSO token redirect fragments.
directly by a web browser, indicative of FileFix or ClickFix-style social engineering
execution.
In these attacks, a malicious webpage silently copies a disguised command
to the user's clipboard; the user is then instructed to paste it into the Windows File
Explorer address bar or Run dialog, resulting in LOLBin execution under the browser's
process context.
Observed delivering loaders, RATs, and ransomware precursors in the
wild since July 2025.
Exclusions applied for Chrome Native Messaging IPC, ClickOnce
application launchers, and OAuth2/OIDC SSO token redirect fragments.
This rule detects a suspicious attack chain, potentially related to 'ClickFix' or similar social engineering campaigns. It correlates multiple events within a 5-minute window: a browser being launched from an email client, a file download from a browser into the Downloads directory, and a command prompt being launched from explorer.exe executing a command that references the Downloads directory. Additionally, it looks for network connections initiated by common document types, which could indicate malicious document activity.
Detects suspicious execution of wget or curl retrieving a payload named exactly '/.shell', which matches Masjesu's C2 download pattern. After successfully exploiting a target, the botnet attempts to retrieve this bash shell file to initiate device infection and propagation routines.
This rule alerts when Cato's inline Anti Malware engine identifies a file in transit as malicious. It fires on both blocked and allowed malware to catch cases where the engine detects but fails to block, indicating a potential compromise or a misconfiguration requiring immediate investigation.
Detects Adobe Reader initiating unexpected network connections, which may indicate an exploit fetching a secondary payload or communicating with a C2 server.
Detects PowerShell download activity, via the .DownloadFile() or .DownloadString() methods of the Net.WebClient class.
This technique is often abused by attackers to download additional payloads.
This technique is often abused by attackers to download additional payloads.
Detects the use of PowerShell's BitsTransfer module to download a payload named "syncobs.exe". This specific file and behavior are associated with the REF6598 campaign, where it is used as a secondary staging mechanism to deliver the PhantomPull in-memory loader and ultimately the PhantomPulse RAT.
Detects instances where the ArcGIS Server process ArcSOC.exe, which hosts REST services running on an ArcGIS
server, creates a file with suspicious file type, indicating that it may be an executable, script file,
or otherwise unusual.
server, creates a file with suspicious file type, indicating that it may be an executable, script file,
or otherwise unusual.
Detects execution of Chromium based browser in headless mode
Detects execution of chromium based browser in headless mode using the "dump-dom" command line to download files
Detects the secondary staging mechanism used by the intermediate PowerShell script before the PhantomPull in-memory loader is executed. This rule specifically looks for PowerShell or PowerShell Core processes executing commands that utilize `Start-BitsTransfer` to download a file named `syncobs.exe`.
Detects the use of curl to download files from Google Drive directly into the C:\Windows\Temp directory. This behavior was observed in an in-memory loader attack chain deploying ScreenConnect.
Detects usage of bitsadmin downloading a file
Detects usage of bitsadmin downloading a file to a suspicious target folder
Detects the execution of PowerShell commands that attempt to install MSI packages via the
Windows Installer COM object (`WindowsInstaller.Installer`) hosted remotely.
This could be indication of malicious software deployment or lateral movement attempts using Windows Installer functionality.
And the usage of WindowsInstaller COM object rather than msiexec could be an attempt to bypass the detection.
Windows Installer COM object (`WindowsInstaller.Installer`) hosted remotely.
This could be indication of malicious software deployment or lateral movement attempts using Windows Installer functionality.
And the usage of WindowsInstaller COM object rather than msiexec could be an attempt to bypass the detection.
Detects suspicious behavior associated with an Adobe Reader zero-day exploit, including specific network connections, suspicious user-agent strings, registry persistence, and specific image loads (e.g., ntdll.dll or bootsvc.dll).
Detects the execution of the "chflags" utility with the "hidden" flag, in order to hide files on MacOS.
When a file or directory has this hidden flag set, it becomes invisible to the default file listing commands and in graphical file browsers.
When a file or directory has this hidden flag set, it becomes invisible to the default file listing commands and in graphical file browsers.
Detects the execution of the nscurl utility in order to download files.
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