Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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Detects execution of AppleScript of the macOS scripting language AppleScript.
Detects macOS system fingerprinting targeting IOPlatformUUID using the ioreg command. This technique was observed being used by the FlutterShell malware (Operation FlutterBridge) to uniquely identify victims upon installation.
Detects co-occurrence of MicrosoftSystem64 binary execution and DNS queries to huggingface.co from the same host within a 5-minute window. MicrosoftSystem64 is a DPRK-attributed (FAMOUS CHOLLIMA / Contagious Interview) multi-platform RAT delivered via malicious npm packages that exfiltrates stolen credentials, screenshots, and wallet data to attacker-controlled HuggingFace datasets. SafeDep confirmed the exfiltration pipeline was actively operating with real victims as of May 28, 2026.
This rule identifies an anomalous surge in network connection attempts to a particular remote IP address. It establishes a baseline of average daily connection counts to each remote IP over the past week. It then compares the current hourly connection count to this baseline, triggering an alert if the current count is more than five times the baseline and surpasses a total of 500 connections within that hour. This could indicate various malicious activities such as data exfiltration, command and control communication, or a denial-of-service attack originating from the monitored environment.
This rule detects the delivery of a macOS Startup Item Property List (.plist) file via HTTP that contains the string "StartupParameters". This could indicate an attempt to establish persistence on a macOS system by creating or modifying a startup item.
This rule detects the creation of an Emond rule on macOS systems, which can be used for persistence. It specifically looks for network traffic containing the string "/etc/emond.d/" in a TCP flow to a server on port 22 (SSH). This indicates an attempt to establish or modify an Emond rule, which allows for scheduled execution of commands or scripts.
Detects the execution of the 'MicrosoftSystem64' RAT binary across Windows, macOS, and Linux operating systems. This specific malware is associated with the FAMOUS CHOLLIMA threat group, which is linked to DPRK, and is known to deploy a Node.js SEA RAT that exfiltrates data to HuggingFace.
This rule detects the creation of 'requirements.txt' or 'pom.xml' files on a system. These files are commonly used in software development projects (Python and Java/Maven, respectively) to manage dependencies and project configurations. Monitoring their creation can help identify legitimate development activities, but also potential malicious actions such as supply chain compromise where an adversary might introduce or modify project dependencies.
GitHub CLI Token Extraction
Cortex XDR
Detects the execution of `gh auth token` which is used by the Shai-Hulud malware to steal the active GitHub Personal Access Token (PAT). This rule specifically looks for the `gh.exe` or `gh` process executing with command-line arguments containing both "auth" and "token".
This rule detects potential C2 beaconing behavior by identifying devices that make a high number of periodic outbound connections (20 or more within an hour) to a single external IP address on common web and C2-related ports (80, 443, 8080, 8443, 4444, 5555, 8888, 9001). The rule summarizes these connections by device, remote IP, and initiating process, highlighting sustained communication patterns indicative of command and control.
Detects the __DAEMONIZED=1 environment variable marker used by the vpmdhaj npm supply chain campaign (Mini Shai-Hulud) to spawn a detached credential-harvesting payload during npm install. This marker prevents re-entry when payload.bin is re-launched on subsequent require() calls. Microsoft explicitly recommends this detection, noting that the exact string __DAEMONIZED=1 has no legitimate npm ecosystem use, leading to near-zero false positives.
Detects Google Chrome being launched with multiple flags designed to suppress crash dialogs and session restore bubbles. This behavior is indicative of forced browser restarts after a hijacker modifies Secure Preferences, as seen with malware like FlutterShell and Calendaromatic (CL-CRI-1089).
Detects potential WordPress malware activity that abuses Steam Community profile comments as a command-and-control (C2) channel. The malware retrieves encoded payloads hidden in Steam profile comments using invisible Unicode characters, decodes malicious URLs, and downloads additional JavaScript payloads. This rule identifies outbound connections from WordPress servers to Steam Community URLs or known malicious infrastructure associated with this campaign.
Detects suspicious execution of the 'open' command targeting the Sparkle framework's installation cache directory on macOS. This activity could indicate the use of a backdoor like FlutterShell attempting to silently update or execute malicious code via a legitimate update mechanism.
Detects Node.js or Bun processes accessing sensitive developer configuration directories such as .ssh and .npmrc, indicating potential credential harvesting. This rule specifically looks for file access or open events initiated by 'node.exe', 'node', 'bun.exe', or 'bun' processes targeting paths containing '.ssh' or '.npmrc', or files named '.npmrc'.
KQL Query
This rule detects devices making a high volume of outbound network connections (more than 1000 connections within a one-minute window) to a single remote IP address. This behavior could indicate a network denial-of-service (DoS) attack originating from the device, or potentially other forms of high-volume network activity such as data exfiltration or scanning.
Detects the silent or command-line driven installation of macOS configuration profiles (`profiles install`), which attackers use to bypass security settings or manage device configurations maliciously.
Detects macOS system fingerprinting targeting IOPlatformUUID using the ioreg command. This technique was observed being used by the FlutterShell malware (Operation FlutterBridge) to uniquely identify victims upon installation.
Detects instances where the 'killall' command is used to forcefully terminate Google Chrome processes. This activity can be indicative of malware attempting to disrupt browser activity, potentially to prevent detection, interfere with user sessions, or facilitate other malicious actions. Specifically, this behavior has been associated with the FlutterShell backdoor.
Detects unauthorized modification of the Google Chrome Secure Preferences file, specifically targeting the default search provider data to hijack browser searches. This behavior is actively used by malware such as FlutterShell to redirect all Chrome searches to attacker-controlled infrastructure.
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