Lookup Virustotal

lookup-virustotal

Queries VirusTotal API v3 for reputation data on IPs, domains, file hashes, and URLs. Retrieval only — do not interpret, assess, or conclude. The invoking skill or agent reasons about the result.

When to invoke

• User asks to check an IP, domain, hash, or URL against VirusTotal
• Investigation skill needs reputation context for a collected indicator
• IOC enrichment pipeline is deduplicating + scoring a batch

How to invoke

Two CLIs are provided. Pick by capability needed:

Basic lookup — Node CLI (zero deps)

node tools/clis/virustotal.js  
# where  is one of: ip, domain, hash, url

Hits the basic object endpoint only and distils to a verdict. Best for fast retrieval inside an investigation chain.

Full surface — Python CLI (stdlib only)

python3 tools/clis/virustotal.py file  [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py ip  [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py domain  [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py url  [--relationships R1,R2] [--limit N]
python3 tools/clis/virustotal.py submit-url 
python3 tools/clis/virustotal.py comments  
python3 tools/clis/virustotal.py search      # Intel — premium

Stdlib only — no install, no venv.

Capabilities the Node CLI doesn't have:

• Relationship traversal — the killer feature for pivoting. For an IP, fetch communicating_files, downloaded_files, resolutions, urls, related_threat_actors, historical_whois. For a file: contacted_ips, contacted_domains, dropped_files, similar_files, behaviours. For a domain: subdomains, siblings, resolutions. For a URL: contacted_ips, contacted_domains, last_serving_ip_address. Each --relationships entry is a separate API request — be deliberate about which to pull.
• URL submission (submit-url) — push a URL into the analysis queue; returns an analysis ID.
• Comments — community comments on any object.
• Intel search — VT Intelligence query language (type:peexe size:1mb+ p:5+). Premium endpoint; will 403 on free.

Examples:

# Pivot from a malicious IP to communicating samples and resolutions
python3 tools/clis/virustotal.py ip 185.220.101.45 --relationships communicating_files,resolutions

# Get a hash plus its sandbox behaviours and contacted infrastructure
python3 tools/clis/virustotal.py file 5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8 \
  --relationships behaviours,contacted_ips,contacted_domains,dropped_files

# Submit a suspicious URL for fresh analysis
python3 tools/clis/virustotal.py submit-url "http://suspicious-site.example/login"

Both CLIs accept --dry-run to preview the request(s) without spending quota. Both exit code 2 if $VIRUSTOTAL_API_KEY is unset (when not in dry-run). Report missing key; do not fabricate.

Quota awareness

Free tier is 4 req/min, 500/day. Each --relationships entry is a separate API call on top of the base lookup. A single ip 1.2.3.4 --relationships a,b,c,d burns 5 requests. Use --dry-run first to count calls before live runs.

Response format

The CLI returns JSON. Skills consuming it should treat it as:

source: virustotal
indicator: 
type: ip | domain | hash | url
query_time: 
detection_ratio: /
community_score: 
verdict: malicious | suspicious | clean | unknown
key_findings:
  - 
  - 
additional_context:
  

Rate limits

Free tier: 4 req/min, 500/day, 15.5k/month. Premium: 1000 req/min. Back off on 429.

Source reliability (Admiralty default)

Default rating for downstream /score-source: B2 (usually reliable, probably true). Community-driven detection aggregator; high-volume but vendor signals vary in quality. Downgrade to C3 if only 1-2 engines detect.

Related skills

• /lookup-otx — community pulse context for the same indicator
• /lookup-urlscan — live scan of URLs/domains
• /lookup-abuseipdb — IP abuse reports
• /score-source — apply Admiralty rating to the result
• /ip-investigation, /domain-investigation, /hash-investigation, /url-investigation — skills that chain this lookup

See also

• Integration setup: tools/integrations/virustotal.md
• Node CLI source: tools/clis/virustotal.js
• Python CLI source: tools/clis/virustotal.py
• Official API reference: https://gtidocs.virustotal.com/reference/api-responses
• Endpoint docs: https://docs.virustotal.com/reference/overview

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: Liberty91LTD
• Source: Liberty91LTD/cti-skills
• License: MIT
• Homepage: https://liberty91.com/cti-skills

Install and usage instructions live in the source repository linked above.