Sigma Rules
75 rules found
Suspicious Browser Child Process - MacOS
Detects suspicious child processes spawned from browsers. This could be a result of a potential web browser exploitation.
Suspicious Execution via macOS Script Editor
Detects when the macOS Script Editor utility spawns an unusual child process.
Potential Discovery Activity Using Find - MacOS
Detects usage of "find" binary in a suspicious manner to perform discovery
Suspicious History File Operations
Detects commandline operations on shell history files
Potential In-Memory Download And Compile Of Payloads
Detects potential in-memory downloading and compiling of applets using curl and osacompile as seen used by XCSSET malware
Suspicious MacOS Firmware Activity
Detects when a user manipulates with Firmward Password on MacOS. NOTE - this command has been disabled on silicon-based apple computers.
System Network Discovery - macOS
Detects enumeration of local network configuration
System Information Discovery Using sw_vers
Detects the use of "sw_vers" for system information discovery
User Added To Admin Group Via Sysadminctl
Detects attempts to create and add an account to the admin group via "sysadminctl"
Guest Account Enabled Via Sysadminctl
Detects attempts to enable the guest account using the sysadminctl utility
System Information Discovery Via Sysctl - MacOS
Detects the execution of "sysctl" with specific arguments that have been used by threat actors and malware. It provides system hardware information. This process is primarily used to detect and avoid virtualization and analysis environments.
System Network Connections Discovery - MacOs
Detects usage of system utilities to discover system network connections
System Information Discovery Using System_Profiler
Detects the execution of "system_profiler" with specific "Data Types" that have been seen being used by threat actors and malware. It provides system hardware and software configuration information. This process is primarily used for system information discovery. However, "system_profiler" can also be used to determine if virtualization software is being run for defense evasion purposes.
System Shutdown/Reboot - MacOs
Adversaries may shutdown/reboot systems to interrupt access to, or aid in the destruction of, those systems.
Potential Base64 Decoded From Images
Detects the use of tail to extract bytes at an offset from an image and then decode the base64 value to create a new file with the decoded content. The detected execution is a bash one-liner.
Time Machine Backup Deletion Attempt Via Tmutil - MacOS
Detects deletion attempts of MacOS Time Machine backups via the native backup utility "tmutil". An adversary may perform this action before launching a ransonware attack to prevent the victim from restoring their files.
Time Machine Backup Disabled Via Tmutil - MacOS
Detects disabling of Time Machine (Apple's automated backup utility software) via the native macOS backup utility "tmutil". An attacker can use this to prevent backups from occurring.
New File Exclusion Added To Time Machine Via Tmutil - MacOS
Detects the addition of a new file or path exclusion to MacOS Time Machine via the "tmutil" utility. An adversary could exclude a path from Time Machine backups to prevent certain files from being backed up.
Potential WizardUpdate Malware Infection
Detects the execution traces of the WizardUpdate malware. WizardUpdate is a macOS trojan that attempts to infiltrate macOS machines to steal data and it is associated with other types of malicious payloads, increasing the chances of multiple infections on a device.
Gatekeeper Bypass via Xattr
Detects macOS Gatekeeper bypass via xattr utility
Potential XCSSET Malware Infection
Identifies the execution traces of the XCSSET malware. XCSSET is a macOS trojan that primarily spreads via Xcode projects and maliciously modifies applications. Infected users are also vulnerable to having their credentials, accounts, and other vital data stolen.
Atomic MacOS Stealer - Persistence Indicators
Detects creation of persistence artifacts placed by Atomic MacOS Stealer in macOS systems. Recent Atomic MacOS Stealer variants have been observed dropping these to maintain persistent access after compromise.
Atomic MacOS Stealer - FileGrabber Activity
Detects suspicious activity associated with Atomic MacOS Stealer (Amos) campaigns, including execution of FileGrabber and curl-based POST requests used for data exfiltration. The rule identifies either the execution of FileGrabber targeting /tmp or the use of curl to POST sensitive user data (including files such as /tmp/out.zip) to remote servers, which are key indicators of Amos infostealer activity.
Axios NPM Compromise File Creation Indicators - MacOS
Detects file creation events linked to the Axios NPM supply chain compromise on macOS devices. Axios is a popular JavaScript HTTP client. On March 30, 2026, malicious versions (1.14.1, 0.30.4) were published to npm, injecting a dependency (plain-crypto-js@4.2.1) that executed a postinstall script as a cross-platform RAT dropper.
Axios NPM Compromise Indicators - macOS
Detects the macOS-specific execution chain of the plain-crypto-js malicious npm dependency in Axios NPM Package, including AppleScript execution via osascript, payload download, permission modification, execution, and cleanup.
Python Path Configuration File Creation - MacOS
Detects creation of a Python path configuration file (.pth) in Python library folders, which can be maliciously abused for code execution and persistence. Modules referenced by these files are run at every Python startup (v3.5+), regardless of whether the module is imported by the calling script. Default paths are '\lib\site-packages\*.pth' (Windows) and '/lib/pythonX.Y/site-packages/*.pth' (Unix and macOS).
Clipboard Data Collection Via Pbpaste
Detects execution of the "pbpaste" utility, which retrieves the contents of the clipboard (a.k.a. pasteboard) and writes them to the standard output (stdout). The utility is often used for creating new files with the clipboard content or for piping clipboard contents to other commands. It can also be used in shell scripts that may require clipboard content as input. Attackers can abuse this utility in order to collect data from the user clipboard, which may contain passwords or sensitive information. Use this rule to hunt for potential abuse of the utility by looking at the parent process and any potentially suspicious command line content.