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Agent skill

Analyzing Persistence Mechanisms In Linux

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Scan Linux systems for persistence mechanisms including crontab/systemd entries, LDPRELOAD injection, shell profile modifications (.bashrc, .profile), and SSH authorizedkeys backdoors, then…

Apache-2.0Auto-check: notesDevOps & Cloud

Install Analyzing Persistence Mechanisms In Linux

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill analyzing-persistence-mechanisms-in-linux -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills analyzing-persistence-mechanisms-in-linux --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/analyzing-persistence-mechanisms-in-linux .claude/skills/analyzing-persistence-mechanisms-in-linux && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
analyzing-persistence-mechanisms-in-linux
GitHub stars
34k
Token cost
~801 tokens
SKILL.md length
282 words
Files
4 (incl. scripts, references)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Scan Linux systems for persistence mechanisms including crontab/systemd entries, LDPRELOAD injection, shell profile modifications (.bashrc, .profile), and SSH authorizedkeys backdoors, then…

  • Works in 7 steps: Scan Crontab Entries — Enumerate all… → Audit Systemd Units — Check… → Detect LD_PRELOAD Hijacking — Check… → …
  • Tasks that involve Linux administration
  • SKILL.md covers Overview, When to Use, Prerequisites and Steps, plus 1 more section
  • Runs Python scripts from its folder

What it does

Analyzing Persistence Mechanisms In Linux is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Scan Linux systems for persistence mechanisms including crontab/systemd entries, LDPRELOAD injection, shell profile modifications (.bashrc, .profile), and SSH authorizedkeys backdoors, then correlate findings with auditd logs into an installation timeline. Use during incident response or threat hunting to detect or confirm how an adversary maintained access to a compromised Linux host.

Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).

It sits in DevOps & Cloud, covering Linux administration, Security operations and Incident response. It works with Linux. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Linux administration
  • Tasks that involve Security operations
  • Tasks that involve Incident response

Example prompts

  • “/analyzing-persistence-mechanisms-in-linux”

Requirements

  • Python 3

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

  1. Scan Crontab Entries — Enumerate all user crontabs, /etc/cron.d/, /etc/cron.daily/, and anacron jobs for suspicious commands
  2. Audit Systemd Units — Check /etc/systemd/system/ and ~/.config/systemd/user/ for non-package-managed service and timer units
  3. Detect LD_PRELOAD Hijacking — Check /etc/ld.so.preload and LD_PRELOAD environment variable for injected shared libraries
  4. Inspect Shell Profiles — Scan .bashrc, .bash_profile, .profile, /etc/profile.d/ for injected commands or reverse shells
  5. Check SSH Authorized Keys — Audit all authorized_keys files for unauthorized public keys with command restrictions
  6. Correlate Auditd Logs — Search auditd logs for file modification events on persistence paths to build an installation timeline
  7. Generate Persistence Report — Produce a risk-scored report of all discovered persistence mechanisms

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Python), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Analyzing Persistence Mechanisms In Linux loads about 801 tokens when it runs, and up to ~1.5k if it reads all its reference files. Until then it costs about 108 tokens; SKILL.md has 282 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~108
When it runs · the whole SKILL.md, loaded when a task matches
~801
With references · SKILL.md plus every file in references/, read only if the agent opens them
~1.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check: notes

The automated check noted patterns worth knowing about, such as sudo or a known installer.

  • NoteRuns commands with sudoSKILL.md:52
    - Root or sudo access on target Linux system (or forensic image)

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 282 words, ~801 tokens.

Download SKILL.mdSave it as .claude/skills/analyzing-persistence-mechanisms-in-linux/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
analyzing-persistence-mechanisms-in-linux
description
Scan Linux systems for persistence mechanisms including crontab/systemd entries, LD_PRELOAD injection, shell profile modifications (.bashrc, .profile), and SSH authorized_keys backdoors, then correlate findings with auditd logs into an installation timeline. Use during incident response or threat hunting to detect or confirm how an adversary maintained access to a compromised Linux host.
domain
cybersecurity
subdomain
threat-hunting
tags
linux-persistence, crontab, systemd, ld-preload, auditd, threat-hunting, incident-response
mitre_attack
T1053.003, T1543.002, T1574.006, T1546.004, T1098.004
version
1.0
author
mahipal
license
Apache-2.0
d3fend_techniques
Executable Denylisting, Execution Isolation, File Metadata Consistency Validation, Process Termination, Content Format Conversion
nist_csf
DE.CM-01, DE.AE-02, DE.AE-07, ID.RA-05

Analyzing Persistence Mechanisms in Linux

Overview

Adversaries establish persistence on Linux systems through crontab jobs, systemd service/timer units, LD_PRELOAD library injection, shell profile modifications (.bashrc, .profile), SSH authorized_keys backdoors, and init script manipulation. This skill scans for all known persistence vectors, checks file timestamps and integrity, and correlates findings with auditd logs to build a timeline of persistence installation.

When to Use

  • When investigating security incidents that require analyzing persistence mechanisms in linux
  • When building detection rules or threat hunting queries for this domain
  • When SOC analysts need structured procedures for this analysis type
  • When validating security monitoring coverage for related attack techniques

Prerequisites

  • Root or sudo access on target Linux system (or forensic image)
  • auditd configured with file watch rules on persistence paths
  • Python 3.8+ with standard library (os, subprocess, json)
  • Optional: OSSEC/Wazuh agent for file integrity monitoring alerts

Steps

  1. Scan Crontab Entries — Enumerate all user crontabs, /etc/cron.d/, /etc/cron.daily/, and anacron jobs for suspicious commands
  2. Audit Systemd Units — Check /etc/systemd/system/ and ~/.config/systemd/user/ for non-package-managed service and timer units
  3. Detect LD_PRELOAD Hijacking — Check /etc/ld.so.preload and LD_PRELOAD environment variable for injected shared libraries
  4. Inspect Shell Profiles — Scan .bashrc, .bash_profile, .profile, /etc/profile.d/ for injected commands or reverse shells
  5. Check SSH Authorized Keys — Audit all authorized_keys files for unauthorized public keys with command restrictions
  6. Correlate Auditd Logs — Search auditd logs for file modification events on persistence paths to build an installation timeline
  7. Generate Persistence Report — Produce a risk-scored report of all discovered persistence mechanisms

Expected Output

  • JSON report of all persistence mechanisms found with risk scores
  • Timeline of persistence installation from auditd correlation
  • MITRE ATT&CK technique mapping (T1053, T1543, T1574, T1546)
  • Remediation commands for each detected persistence mechanism

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references) in skills/analyzing-persistence-mechanisms-in-linux of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • references/api-reference.md
  • scripts/agent.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

Analyzing Persistence Mechanisms In Linux next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Analyzing Persistence Mechanisms In Linux compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Analyzing Persistence Mechanisms In Linux this skillmukul975/Anthropic-Cybersecurity-Skills34k—~801Automated safety check: NotesApache-2.0
Enterprise Agent Opsaffaan-m/ECC276k4 repos~384Automated safety check: PassMIT
Sentinelvinayaklatthe/microsoft-security-skills175—~2.2kAutomated safety check: PassMIT
Forensics OsqueryAgentSecOps/SecOpsAgentKit2201 repos~4.9kAutomated safety check: NotesCustom licence
Incident Responsealirezarezvani/claude-skills28k—~3.8kAutomated safety check: PassMIT
Soc Operationsbriiirussell/cybersecurity-skills413—~2.9kAutomated safety check: PassMIT

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Works with

Categories

Questions about Analyzing Persistence Mechanisms In Linux

What does Analyzing Persistence Mechanisms In Linux do?

Scan Linux systems for persistence mechanisms including crontab/systemd entries, LDPRELOAD injection, shell profile modifications (.bashrc, .profile), and SSH authorizedkeys backdoors, then…. Analyzing Persistence Mechanisms In Linux is an agent skill from mukul975/Anthropic-Cybersecurity-Skills.profile), and SSH authorizedkeys backdoors, then correlate findings with auditd logs into an installation timeline.

When should I use Analyzing Persistence Mechanisms In Linux?

Analyzing Persistence Mechanisms In Linux fits situations like: tasks that involve Linux administration; tasks that involve Security operations; tasks that involve Incident response.

How do I install Analyzing Persistence Mechanisms In Linux in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill analyzing-persistence-mechanisms-in-linux -a claude-code`. Or copy the skill folder (skills/analyzing-persistence-mechanisms-in-linux in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/analyzing-persistence-mechanisms-in-linux in your project. Claude Code loads it when a task matches its description.

How do I install Analyzing Persistence Mechanisms In Linux in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill analyzing-persistence-mechanisms-in-linux -a codex`. Or copy the skill folder (skills/analyzing-persistence-mechanisms-in-linux in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/analyzing-persistence-mechanisms-in-linux in your project. Codex loads it when a task matches its description.

Can I use Analyzing Persistence Mechanisms In Linux in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill analyzing-persistence-mechanisms-in-linux -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/analyzing-persistence-mechanisms-in-linux, .gemini/skills/analyzing-persistence-mechanisms-in-linux, .github/skills/analyzing-persistence-mechanisms-in-linux and .opencode/skills/analyzing-persistence-mechanisms-in-linux in your project.

What does Analyzing Persistence Mechanisms In Linux need to run?

Going by SKILL.md and its folder, Analyzing Persistence Mechanisms In Linux needs Python for the scripts in its folder. Our summary lists: Python 3.

Does Analyzing Persistence Mechanisms In Linux access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Analyzing Persistence Mechanisms In Linux safe to install?

Our automated static check of SKILL.md found notes only (runs commands with sudo), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Analyzing Persistence Mechanisms In Linux use?

Analyzing Persistence Mechanisms In Linux is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Analyzing Persistence Mechanisms In Linux use?

About 801 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 691 tokens, read only when the agent opens those files.

What are the alternatives to Analyzing Persistence Mechanisms In Linux?

Skills that share tags, products or a category with Analyzing Persistence Mechanisms In Linux: Enterprise Agent Ops (affaan-m/ECC, 276k stars), Sentinel (vinayaklatthe/microsoft-security-skills, 175 stars), Forensics Osquery (AgentSecOps/SecOpsAgentKit, 220 stars) and Incident Response (alirezarezvani/claude-skills, 28k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Analyzing Persistence Mechanisms In Linux?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 34,116 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.