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FC eradicating-malware-from-infected-systems

Systematically map and remove malware, backdoors, and attacker persistence mechanisms (registry Run keys, scheduled tasks, WMI subscriptions, services, cron/init.d) from infected Windows and Linux systems using Autoruns, EDR/AV, and YARA, restoring a clean state while preventing re-infection. Use after containment and forensic analysis have identified all compromised systems and persistence mechanisms and you are ready to eradicate and recover.

mukul975/Anthropic-Cybersecurity-Skills Agent Skills author: mukul975 Apache-2.0 8 files · 2 scripts body ≈ 1 980 tokens Open the sourcegithub.com↗ analyzed 5 d ago

Systematically map and remove malware, backdoors, and attacker persistence mechanisms (registry Run keys, scheduled tasks, WMI subscriptions, services…

As a process C 62/100 · Has gaps — weak spots: when it triggers, failures and branches, running it twice

ProcedureSecuritytype and topics are labelled automatically from the skill text
Runs in: Claude / Claude Code ChatGPT / Codex Gemini CLI Cursor GitHub Copilot / VS Code Qwen Code Kimi Code CLI Z.ai (GLM) DeepSeek (Deep Code) Mistral Vibe LangChain (deepagents) OpenClaw Goose OpenCode
JSON
Technical rating
F
48/100
safety, quality, tests
Safety 60%
30
Quality 40%
74
Run on models
none yet
Process rating
C
62/100
Has gaps
Failures and branches w 10
0
When it triggers w 12
20
Running it twice w 4
30
the three weakest of ten parameters · all ten

What is at stake

Medium-severity findings: the skill is probably honest, but read what alarmed the scanner.

Dangerous commands medium severity

Below is the worst case for this category. The finding here is medium: the guard saw a sign, not a proof.

If you install

The skill contains commands that delete files, rewrite disks or execute code fetched from the network. The agent may run them without asking if it believes the instructions require it.

For the author

Replace destructive commands with safe equivalents that ask for confirmation, scope them to one folder, and stop piping curl into a shell: pin a version and a checksum.

How to improve

    For the model run — optional
    • Your own cases (evals/evals.json, 4–6 real requests with expected answers): the full check would then run those instead of a model-drafted suite.
    • A spec.yaml with trigger phrases and assertions — a behaviour contract for CI; `skilltest init` writes a template.

    Guard findings · 22

    ✓ No critical or high findings

    Medium and low: 22
    • medium Dangerous commands cmd-persistence references/api-reference.md:45
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      ls -la /etc/cron.d/
      security skill
    • medium Dangerous commands cmd-persistence references/workflows.md:80
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
      security skill
    • medium Dangerous commands cmd-persistence references/workflows.md:81
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
      security skill
    • medium Dangerous commands cmd-persistence references/workflows.md:89
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      %AppData%\Microsoft\Windows\Start Menu\Programs\Startup
      security skill
    • medium Dangerous commands cmd-persistence references/workflows.md:90
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup
      security skill
    • medium Dangerous commands cmd-persistence references/workflows.md:103
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      /etc/crontab
      security skill
    • medium Dangerous commands cmd-persistence scripts/agent.py:13
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed)
      r"HKCU\Software\Microsoft\Windows\CurrentVersion\Run",
      code literal
    • medium Dangerous commands cmd-persistence scripts/agent.py:14
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed)
      r"HKLM\Software\Microsoft\Windows\CurrentVersion\Run",
      code literal
    • medium Dangerous commands cmd-persistence scripts/agent.py:21
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed)
      "/etc/cron.d", "/var/spool/cron", "/etc/crontab",
      code literal
    • medium Dangerous commands cmd-persistence scripts/process.py:68
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed)
      r"HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run",
      code literal
    • medium Dangerous commands cmd-persistence scripts/process.py:69
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (string literal in code, not executed)
      r"HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run",
      code literal
    • medium Dangerous commands cmd-persistence SKILL.md:76
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (documentation of a security skill)
      cat /etc/crontab
      security skill
    • low Dangerous commands cmd-cron-mention references/api-reference.md:43
      Mentions editing / listing crontab (documentation of a security skill)
      crontab -l -u root         # List root cron
      security skill
    • low Risky intent intent-offensive-security references/standards.md:57
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      ## CISA Malware Analysis Reports (MARs)
    • low Dangerous commands cmd-persistence scripts/process.py:150
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (detector / deny-list definition; string literal in code, not executed)
      os.path.expandvars(r"%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup"),
      detectorcode literal
    • low Dangerous commands cmd-persistence scripts/process.py:151
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (detector / deny-list definition; string literal in code, not executed)
      r"C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup",
      detectorcode literal
    • low Dangerous commands cmd-persistence scripts/process.py:189
      Persistence mechanism (cron / launchd / scheduled task / autorun registry) (detector / deny-list definition; string literal in code, not executed)
      cron_paths = ["/etc/crontab"]
      detectorcode literal

    A further 5 matches are quotations in this security skill's documentation and are not counted as findings.

    Files scanned: 8. Evidence is masked. Grey chips explain why severity was lowered.

    Against the Agent Skills spec

    • note frontmatter-key unknown frontmatter key "domain"
    • note frontmatter-key unknown frontmatter key "subdomain"
    • note frontmatter-key unknown frontmatter key "mitre_attack"
    • note frontmatter-key unknown frontmatter key "nist_csf"

    Process rating: all ten parameters 62/100

    • 0Failures and branches. Linear process with no failure handling
    • 20When it triggers. No condition that starts the skill
    • 30Running it twice. 9 mutating operations with no state check
    • 60Tools and files. Uses tools (bash) that frontmatter does not declare
    • 60Result and completion. Output format stated, no completion criterion
    • 70Inputs and preconditions. Inputs and preconditions are listed
    • 100Steps. 21 steps
    • 100Consistency. Name and required fields are in place
    • 100Execution cost. Instruction body is 1980 tokens
    • 100Progress reporting. Reports progress

    Everything here is measured from the skill text rather than judged by a model, so the numbers are checkable. A parameter weighs more when it is a more common reason for the process to stall.

    Quality signals

    • +5Description has no quoted example phrases that should trigger the skill
    • +4Description does not say when NOT to use the skill (false activations)
    • -4Absolute local paths (C:\Users, /home/…): not portable
    • -43 reference files, but SKILL.md never points to them: the model will not open them
    • -32 of 2 scripts are never mentioned in SKILL.md
    • +2Single-language instructions
    • +3Description length 448: enough signal without eating the budget
    • +4Structure: 14 headings
    • +3Step-by-step instructions: 21 items
    • +3Output format is stated explicitly
    • +4Has examples (6 code blocks)
    • +1License stated

    Quality base 70; lint remarks subtract, signals add up to 100. Result: 74.