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DB implementing-ransomware-backup-strategy

Designs a ransomware-resilient backup strategy using the 3-2-1-1-0 methodology (3 copies, 2 media types, 1 offsite, 1 immutable/air-gapped, 0 restore errors), configuring RPO/RTO-aligned schedules, isolating backup credentials, and automating restore testing. Use when planning ransomware backup resilience or air-gapped/immutable backup architecture.

mukul975/Anthropic-Cybersecurity-Skills Agent Skills author: mukul975 Apache-2.0 8 files · 2 scripts body ≈ 2 786 tokens Open the sourcegithub.com↗ analyzed 5 d ago

Designs a ransomware-resilient backup strategy using the 3-2-1-1-0 methodology (3 copies, 2 media types, 1 offsite, 1 immutable/air-gapped, 0 restore errors)…

As a process B 70/100 · Nearly there — weak spots: failures and branches, running it twice, progress reporting

ProcedureAWSSoftware developmentInfrastructureSecuritytype 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
D
77/100
safety, quality, tests
Safety 60%
74
Quality 40%
82
Run on models
none yet
Process rating
B
70/100
Nearly there
Failures and branches w 10
0
Progress reporting w 2
0
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 · 18

    ✓ No critical or high findings

    Medium and low: 18
    • medium Dangerous commands cmd-privilege SKILL.md:176
      Privilege escalation / world-writable permissions
      sudo mkfs.xfs -b size=4096 -m reflink=1 /dev/sdb1
    • medium Dangerous commands cmd-privilege SKILL.md:182
      Privilege escalation / world-writable permissions
      sudo chown veeamuser:veeamuser /mnt/veeam-repo/backups
    • low Risky intent intent-offensive-security assets/template.md:1
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      # Ransomware Backup Strategy Assessment Template
    • low Risky intent intent-offensive-security references/api-reference.md:1
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      # API Reference: Ransomware Backup Strategy Audit
    • low Risky intent intent-offensive-security references/api-reference.md:37
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      ### Check Bucket Versioning (Ransomware Recovery)
    • low Risky intent intent-offensive-security references/api-reference.md:53
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use) (detector / deny-list definition)
      "remediation": "Enable versioning for ransomware recovery",
      detector
    • low Risky intent intent-offensive-security references/api-reference.md:204
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use) (detector / deny-list definition)
      "issue": "No Object Lock — vulnerable to ransomware deletion",
      detector
    • low Risky intent intent-offensive-security references/standards.md:1
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      # Standards & References - Ransomware Backup Strategy
    • low Risky intent intent-offensive-security references/standards.md:10
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      ### NIST IR 8374: Ransomware Risk Management
    • low Risky intent intent-offensive-security references/workflows.md:1
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      # Workflows - Ransomware Backup Strategy
    • low Risky intent intent-offensive-security references/workflows.md:94
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use) (detector / deny-list definition)
      ## Workflow 3: Emergency Ransomware Recovery
      detector
    • low Risky intent intent-offensive-security references/workflows.md:97
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      Ransomware Incident Declared
    • low Risky intent intent-offensive-security references/workflows.md:106
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use) (detector / deny-list definition)
      |-- Scan backup files for ransomware artifacts
      detector
    • low Risky intent intent-offensive-security SKILL.md:2
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      name: implementing-ransomware-backup-strategy
    • low Risky intent intent-offensive-security SKILL.md:3
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use) (quoted — discussed, not commanded)
      description: 'Designs a ransomware-resilient backup strategy using the 3-2-1-1-0
      quoted
    • low Risky intent intent-offensive-security SKILL.md:6
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      automating restore testing. Use when planning ransomware backup resilience or air-gapped/immutable
    • low Risky intent intent-offensive-security SKILL.md:11
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      subdomain: ransomware-defense
    • low Risky intent intent-offensive-security SKILL.md:13
      Offensive-security / dual-use content (legitimate for authorised testing; review intended use)
      - ransomware

    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 "nist_ai_rmf"
    • note frontmatter-key unknown frontmatter key "atlas_techniques"
    • note frontmatter-key unknown frontmatter key "nist_csf"
    • note frontmatter-key unknown frontmatter key "mitre_attack"
    • note frontmatter-key unknown frontmatter key "mitre_f3"

    Process rating: all ten parameters 70/100

    • 0Failures and branches. Linear process with no failure handling
    • 0Progress reporting. Says nothing while it works
    • 30Running it twice. 6 mutating operations with no state check
    • 50When it triggers. No condition that starts the skill
    • 60Result and completion. Output format stated, no completion criterion
    • 70Inputs and preconditions. Inputs and preconditions are listed
    • 100Tools and files. No external tools needed
    • 100Steps. 31 steps
    • 100Consistency. Name and required fields are in place
    • 100Execution cost. Instruction body is 2786 tokens

    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
    • -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
    • +4Description says when NOT to use the skill
    • +3Description length 351: enough signal without eating the budget
    • +4Structure: 14 headings
    • +3Step-by-step instructions: 31 items
    • +3Output format is stated explicitly
    • +4Has examples (11 code blocks)
    • +1License stated

    Quality base 70; lint remarks subtract, signals add up to 100. Result: 82.