Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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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 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 the use of PowerShell commands that leverage 'Invoke-Expression' (IEX) in conjunction with 'Net.WebClient' or 'DownloadString' methods to download and execute code directly from the internet into memory.
Detects the creation of files with suspicious names (e.g., .xlamb, lambsys) in the /var/tmp directory, initiated by common command-line interpreters or network transfer utilities. This behavior is often indicative of malware deployment or staging in a Linux environment.
This rule monitors for the creation of .exe or .msi files within common user-writable directories (Downloads, Temp, AppData) initiated by web browser processes (Chrome, Edge, Firefox, Brave). This behavior is often indicative of drive-by downloads or users interacting with malicious web content that delivers installers to the host.
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.
This rule detects a suspicious sequence of network connections indicative of information stealer activity, specifically targeting behaviors observed with malware like VVS Stealer. It identifies instances where a non-browser process, originating from common user-writable or temporary directories (AppData, Temp, Downloads, Users\Public), first connects to an external IP discovery service (ipify.org) and then subsequently communicates with Discord services (discord.com or discordapp.com) within a ten-minute window. This pattern suggests that malware is collecting the victim's public IP address before exfiltrating stolen data (e.g., account or browser information) to Discord infrastructure, often used as a command and control or data exfiltration channel by stealers.
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 creation of multiple files with the same GUID-like name but different extensions (VBS, BAT, CMD, HTM, XHTML) within a short time frame in the user profile directory. This pattern is characteristic of the APT28 "Operation MacroMaze" dropper behavior.
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 suspicious process injection attempts where common scripting/execution binaries (wscript.exe, cscript.exe, mshta.exe, powershell.exe, msiexec.exe) are observed creating remote threads in other processes (RegAsm.exe, InstallUtil.exe, vbc.exe, svchost.exe, explorer.exe). The detection is further refined by looking for specific keywords in the initiating process's command line that are indicative of malicious activity, such as downloading content or executing scripts. This rule aims to identify advanced persistent threats and malware leveraging process injection for defense evasion and privilege escalation.
Detects LCRYX ransomware components executing via wscript.exe or cscript.exe to download secondary malicious payloads using MSXML2.ServerXMLHTTP and ADODB.Stream, targeting the C:\Windows\ directory. The rule matches on specific C2 domains/IP addresses and known file drop paths associated with multi-stage malware infections.
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.
Detects potential Windows executable or DLL file downloads originating from or directed to a specific suspicious external IP address (154.49.70.216) over HTTP port 80, based on signature-based alerts from network security tools.
Detects the macOS.Gaslight Rust-based implant receiving and executing backdoor commands (e.g., shell, kill, upload, persistence) via the Telegram Bot API. The rule correlates outbound network connections to api.telegram.org with subsequent process execution patterns typical of command dispatch (such as execvp or posix_spawnp).
Detects suspicious bash one-liners executed within macOS Terminal typically associated with the AMOS (Atomic macOS Stealer) 'ClickFix' campaign. The rule monitors for a sequence involving temporary file creation, downloading a disk image (DMG) from a known malicious domain ('svs-verificationdate.beer'), and silently attaching the DMG via hdiutil.
Detects network connections from a host to the api.adblock-for-youtube.com domain at the /api/v2/rules endpoint. This behavior is associated with the 'Adblock for YouTube' browser extension (cmedhionkhpnakcndndgjdbohmhepckk) as it retrieves remote JavaScript scriplets for rule updates, which can be a vector for unauthorized code execution if the domain is compromised or used maliciously.
Detects the creation of executable files (exe, dll, bat, ps1, vbs, msi, lnk) by common web browsers (Chrome, Firefox, Edge, Internet Explorer) or email clients (Outlook). This activity can indicate a user downloading or receiving a potentially malicious file, which could lead to initial access or further compromise.
Detects various post-exploitation activities associated with the Amadey loader, including the execution of its persistence mechanism (nudwee.exe), dropping and executing secondary payloads in temporary directories, using PowerShell download cradles, creating scheduled tasks for persistence, and silent MSI installations. This rule aims to identify the delivery of secondary payloads like StealC and Lumma Stealer.
Detects suspicious usage of the 'curl' command-line tool to perform PUT or POST requests with binary data to specific paths, potentially indicating data exfiltration or command and control communication. The rule excludes common web browsers as initiating processes to reduce false positives.
Detects PowerShell execution with a highly suspicious command line containing common obfuscation techniques, the 'DownloadString' method, and a hardcoded IP address. This pattern is frequently observed in malware and adversary tooling to download and execute malicious payloads from a remote server.
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