Browse Rules

Linux Doas Conf File Creation

Detects the creation of doas.conf file in linux host platform.

Linux Doas Tool Execution

Detects the doas tool execution in linux host platform. This utility tool allow standard users to perform tasks as root, the same way sudo does.

Binfmt Configuration File Creation

This rule detects the creation of a binfmt configuration file. Binfmt is a utility that is used to configure the behavior of the Linux kernel when executing binary files. By creating a malicious binfmt configuration file, threat actors can execute a backdoor script or command on the target system.

Axios NPM Compromise Indicators - Linux

Detects the Linux-specific execution chain of the plain-crypto-js malicious npm dependency by Axios NPM package, including payload download via curl and detached execution using nohup and python3. 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. The dropper contacted a C2 server, delivered platform-specific payloads, deleted itself, and replaced package.

GKE Container Created with Excessive Linux Capabilities

Detects GKE pod creation with dangerous Linux capabilities that are commonly abused in container escape techniques. Standalone pods are included; controller-owned ReplicaSet, DaemonSet, and StatefulSet workloads are excluded.

a_webshell_ensiko_with_ransomware_capabilities

Ensiko is a PHP web shell with ransomware capabilities that targets various platforms such as Linux, Windows, macOS, or any other platform that has PHP installed. The malware has the capability to remotely control the system and accept commands to perform malicious activities on the infected machine. License: https://github.com/Neo23x0/sigma/blob/master/LICENSE.Detection.Rules.md.

Linux Auditd Preload Hijack Library Calls

The following analytic detects the use of the LD_PRELOAD environment variable to hijack or hook library functions on a Linux platform. It leverages data from Linux Auditd, focusing on process execution logs that include command-line details. This activity is significant because adversaries, malware authors, and red teamers commonly use this technique to gain elevated privileges and establish persistence on a compromised machine. If confirmed malicious, this behavior could allow attackers to exec

Unusual Linux User Calling the Metadata Service

Looks for anomalous access to the cloud platform metadata service by an unusual user. The metadata service may be targeted in order to harvest credentials or user data scripts containing secrets.

Suspicious Process Execution by Zoom

Identifies suspicious process execution associated with the Zoom desktop client on macOS and Linux. The rule detects shells, script interpreters, downloaders, and network utilities spawned by Zoom on either platform. On Linux, it also detects Zoom replacing its own process image with an executable outside the Zoom installation directory. These behaviors may indicate successful exploitation of a Zoom client vulnerability, including CVE-2026-53413.

Linux Service Started Or Enabled

The following analytic detects the creation or enabling of services on Linux platforms using the systemctl or service tools. It leverages Endpoint Detection and Response (EDR) logs, focusing on process names, parent processes, and command-line executions. This activity is significant as adversaries may create or modify services to maintain persistence or execute malicious payloads. If confirmed malicious, this behavior could lead to persistent access, data theft, ransomware deployment, or other

TanStack Supply-Chain Attack Execution Indicators - Linux

Detects process execution indicators associated with the Mini Shai-Hulud supply-chain campaign targeting TanStack npm packages and others such as mistralai and uipath reported on early May 2026. The preinstall hook runs setup.mjs, which downloads a platform-specific Bun runtime.

Linux Preload Hijack Library Calls

The following analytic detects the use of the LD_PRELOAD environment variable to hijack or hook library functions on a Linux platform. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs that include command-line details. This activity is significant because adversaries, malware authors, and red teamers commonly use this technique to gain elevated privileges and establish persistence on a compromised machine. If confirmed malicious, this behavi

Linux Sudoers Tmp File Creation

The following analytic detects the creation of the "sudoers.tmp" file, which occurs when editing the /etc/sudoers file using visudo or another editor on a Linux platform. This detection leverages filesystem data to identify the presence of "sudoers.tmp" files. Monitoring this activity is crucial as adversaries may exploit it to gain elevated privileges on a compromised host. If confirmed malicious, this activity could allow attackers to modify sudoers configurations, potentially granting them un

Linux Service File Created In Systemd Directory

The following analytic detects the creation of suspicious service files within the systemd directories on Linux platforms. It leverages logs containing file name, file path, and process GUID data from endpoints. This activity is significant for a SOC as it may indicate an adversary attempting to establish persistence on a compromised host. If confirmed malicious, this could lead to system compromise or data exfiltration, allowing attackers to maintain control over the system and execute further

Suspicious Reading of procfs Syscall File

This rule detects command lines that reference another process or thread's procfs syscall file. The "/proc/<pid>/syscall" interface exposes the current syscall arguments, stack pointer, and instruction pointer, which can support process discovery and preparation for process injection. Self and thread-self aliases are excluded.

Linux Suspicious Child Process Execution via Interactive Shell

Detects when a process is executed via an interactive shell. C2 platforms will commonly spawn an interactive shell providing the threat actor with a remote shell on the system as if they were physically at the terminal allowing them to send and execute commands manually.

PUA - TruffleHog Execution - Linux

Detects execution of TruffleHog, a tool used to search for secrets in different platforms like Git, Jira, Slack, SharePoint, etc. that could be used maliciously. While it is a legitimate tool, intended for use in CI pipelines and security assessments, It was observed in the Shai-Hulud malware campaign targeting npm packages to steal sensitive information.

Axios NPM Compromise File Creation Indicators - Linux

Detects file creation events linked to the Axios NPM supply chain compromise. 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.

General Kernel Manipulation

This hunt focuses on detecting general kernel and bootloader manipulations on Linux systems, which are critical for system integrity and security. Attackers may target kernel components, bootloader configurations, or secure boot settings to establish persistence or compromise the system at a low level. By monitoring changes to `/boot/` files, examining kernel and platform information, and detecting processes spawned by `systemd`, this hunt provides visibility into potential kernel and boot-relat

Sliver C2 Implant Activity Pattern [splunk-edr]

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. This use case detects

Sliver C2 Implant Activity Pattern [splunk-powershell]

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. This use case detects

Sliver C2 Implant Activity Pattern [splunk-sysmon]

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. This use case detects

Sliver C2 Implant Activity Pattern [splunk-winevent]

Adversaries may abuse command and script interpreters to execute commands, scripts, or binaries. These interfaces and languages provide ways of interacting with computer systems and are a common feature across many different platforms. Most systems come with some built-in command-line interface and scripting capabilities, for example, macOS and Linux distributions include some flavor of Unix Shell while Windows installations include the Windows Command Shell and PowerShell. This use case detects

AWS Suspicious User Agent Fingerprint

Identifies successful AWS API calls where the CloudTrail user agent indicates offensive tooling or automated credential verification. This includes the AWS CLI or Boto3 reporting a Kali Linux distribution fingerprint (`distrib#kali`), and clients that identify as TruffleHog, which is commonly used to validate leaked secrets against live AWS APIs. These patterns are uncommon for routine production workloads and may indicate compromised credentials, unauthorized access, or security tooling operati

Kubernetes Secret Get or List with Suspicious User Agent

Detects read access to Kubernetes Secrets (get/list) with a user agent matching a curated set of non-standard or attacker-leaning clients, for example minimal HTTP tooling, common scripting stacks, default library fingerprints, or distribution-tagged strings associated with offensive-security Linux images. Legitimate in-cluster automation usually presents stable, purpose-specific user agents (for example controller or client-go variants used by known components).