Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This rule detects command and control (C2) communication associated with the 'easy-day-js' backdoor, which is part of the Mastra npm supply chain attack. It specifically looks for HTTP POST requests to the IP address 23.254.164.123 with a spoofed Internet Explorer 8 User-Agent string.
Detects malicious node.js processes spawned from npm lifecycle hooks (e.g., install, postinstall) that exhibit suspicious command-line arguments, environment variables, or connections to known malicious domains associated with supply chain compromise campaigns.
This rule monitors for DNS queries, network connections, and HTTP proxy requests originating from node/npm processes or targeting known infrastructure associated with the Trum3it campaign. It covers common malicious domains and specific Vercel subdomains identified as command-and-control (C2) endpoints.
This rule detects the execution of obfuscated PowerShell commands (encoded) that subsequently establish an external network connection and perform process injection within a short timeframe (120 seconds). This behavior is characteristic of malicious staged execution, where a PowerShell script acts as a dropper or loader to fetch secondary payloads and inject them into other processes for evasion.
This rule detects potential supply chain compromise involving typosquatted npm packages. It monitors for the execution of npm packages with names closely resembling legitimate libraries (e.g., 'thirdweb', 'rainbownkit'), followed by suspicious post-install scripts that attempt to initiate network connections to known malicious domains or modify sensitive files.
Detects network connections or DNS queries to ErrTraffic Beer cluster domains impersonating AI platforms (ChatGPT, Google Antigravity) delivering DanaBot/HijackLoader via BSOD or reCAPTCHA ClickFix lures, and subsequent browser-spawned PowerShell execution.
Identifies mshta.exe accessing externally hosted HTA content from a user-initiated Explorer session, potentially indicating malicious remote code execution.
Detects SPECTRALVIPER threat activity by monitoring for unauthorized masquerading as legitimate OneDrive sync processes. The rule identifies suspicious process creation, beaconing to C2 infrastructure, DtlCrashCatch.dll sideloading, and unauthorized cross-process injection behaviors associated with this threat actor.
Detects outbound HTTP PUT requests to 'filen.io', which has been associated with command-and-control (C2) communication for the PRISMEX malware used by the threat actor APT28 (also known as Pawn Storm/Fancy Bear).
Detects outbound HTTP POST requests to file.io originating from a Go-based HTTP client, consistent with the GopherWhisper APT C2 or exfiltration activity.
Detects outbound HTTP POST requests to file.io originating from a Go-based HTTP client, consistent with the GopherWhisper APT C2 or exfiltration activity.
Detects network beaconing activity attributed to the OceanLotus (APT32) threat group, specifically the SPECTRALVIPER C2 mechanism. The rule identifies the 'OneDrive.Sync.Services.exe' process performing HTTP GET requests to known attacker-controlled infrastructure or using specific malicious cookie headers (zd_cs_pm, euconsent-v2) for command-and-control communication.
Detects the SPECTRALVIPER downloader component characteristic of OceanLotus activity. The rule monitors for a specific HTTP POST request to a check-in URL, followed by the execution of IntelAudioService.exe with command-line arguments indicating a side-loading attack chain from the appmodel StateRepository.
Detects outbound network connections initiated by ConfigurationRemotingServer.exe on port 443, which may indicate a reverse shell connection established via DSC (Desired State Configuration) resources.
Detects two distinct suspicious activities on Linux systems: masquerading by processes named 'uptime' making outbound network connections to non-local IP ranges, and the execution of binaries associated with AtlasRAT.
Detects outbound network connections to common Large Language Model (LLM) APIs (OpenAI, Anthropic, Google) or local LLM instances (Ollama) from processes that are not standard web browsers, common IDEs, or typical development/scripting tools. This behavior may indicate an attempt to exfiltrate sensitive data or interact with LLM services using unauthorized or hidden processes.
Detects path traversal attempts within HTTP request parameters, specifically identifying encoded traversal sequences, file protocol usage, and attempts to access sensitive system files like /etc/passwd or /proc/self/environ.
This rule detects command-and-control (C2) communication patterns associated with the Kimsuky threat group (specifically NUKESPED malware). It identifies network traffic to specific Fastly CDN IP addresses or domains related to the National Health Insurance Service (nhis.or.kr) originating from known malicious or suspicious execution processes like wscript.exe, cscript.exe, powershell.exe, or zlrenu8.exe.
Detects fltMC.exe initiating outbound network connections, which is anomalous behavior indicative of potential JFMBackdoor activity (associated with Red Lamassu/Calypso) utilizing DLL sideloading or reverse shell execution.
Detects outbound network connections to major Large Language Model (LLM) API endpoints (OpenAI, Google, Anthropic) initiated by processes not explicitly identified as standard web browsers or command-line utilities. This pattern may indicate automated data exfiltration ('prompt stealing' or unauthorized access to corporate data) using custom or malicious tools executing from suspicious directories like temp, appdata, or public folders.
This rule detects suspicious outbound network connections to specific Fastly CDN IP addresses associated with the Kimsuky threat group's NUKESPED backdoor. The rule identifies processes attempting to communicate with these infrastructure IPs that are not part of a predefined list of trusted or common legitimate applications, indicating potential command and control (C2) activity.
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