vamp-easm

Continuous External Attack Surface Management with daily diff tracking

Part of the VampSecure Labs security toolkit.

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Overview

vamp-easm is a lightweight EASM engine designed to run continuously (via cron or CI/CD) against one or more external domains. Unlike point-in-time scanners, its core value is delta detection: each run is compared against the previous snapshot stored in a local SQLite database, surfacing only what changed.

Key Features

• Subdomain enumeration — queries crt.sh (Certificate Transparency) and HackerTarget via standard urllib (no external dependencies for this layer)
• Port scanning — async TCP connect scan over the top-100 most common ports using asyncio + stdlib socket; optional nmap backend for accuracy
• TLS certificate inspection — hostname, issuer, expiration date, SANs, self-signed detection and SHA-256 fingerprint via stdlib ssl
• SQLite history — every scan is stored; diffs are computed against the last completed scan for the same target
• Structured findings — diffs are normalized as VSL findings (prefix EASM-NNN) compatible with vamp-penreport
• Webhook alerts — POSTs a JSON payload (Slack/Discord/Mattermost compatible) when CRITICAL or HIGH diffs are found
• Exit codes — machine-friendly: 0 clean, 1 HIGH diffs, 2 CRITICAL diffs (CI/CD and monitoring ready)

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Diff Types and Severities

Category	Severity	Description
NUEVO_SUBDOMINIO	HIGH	A subdomain not seen in the previous scan has appeared
NUEVO_PUERTO	MEDIUM	A TCP port is open that was closed in the previous scan
CERT_EXPIRADO	HIGH / CRITICAL	TLS certificate expires within 30 days (HIGH) or is already expired (CRITICAL)
CERT_CAMBIADO	CRITICAL	TLS fingerprint changed since the last scan — possible re-issue or MitM
SERVICIO_DESAPARECIDO	LOW	A previously open port is no longer reachable
IP_CAMBIADA	MEDIUM	DNS resolution for a known subdomain returned a different IP

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Installation

pip install vamp-easm
# o con Homebrew:
brew install vampsecure-labs/labs/vamp-easm

# 1. Clone and enter the directory
git clone https://github.com/Vampsecure-Labs/vamp-easm.git
cd vamp-easm

# 2. Create and activate a virtual environment
python3 -m venv .venv
source .venv/bin/activate   # Windows: .venv\Scripts\activate

# 3. Install dependencies
pip install -r requirements.txt

Optional: install nmap on your system and use --nmap for more reliable port scanning.

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Usage

Scan a target

# Default: top-100 ports, stdlib async scanner
python vamp_easm.py scan --target example.com

# Custom port list
python vamp_easm.py scan --target example.com --ports 22,80,443,8080,8443

# Use nmap as port-scan backend (requires nmap in PATH)
python vamp_easm.py scan --target example.com --nmap

# Export findings as HTML and JSON reports
python vamp_easm.py scan --target example.com --html --json

# Send alerts to a webhook on CRITICAL/HIGH diffs
python vamp_easm.py scan --target example.com --alert-webhook https://hooks.slack.com/...

# Full example
python vamp_easm.py scan \
  --target example.com \
  --ports top100 \
  --html \
  --alert-webhook "$SLACK_WEBHOOK" \
  --client "AcmeCorp" \
  --engagement "Q3-2026-EASM"

View scan history

python vamp_easm.py history --target example.com
python vamp_easm.py history --target example.com --limit 20

List known assets

python vamp_easm.py assets --target example.com

Export a snapshot

# Export last scan as both JSON and HTML
python vamp_easm.py export --target example.com

# JSON only
python vamp_easm.py export --target example.com --json

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Cron Example

Run a daily EASM scan with Slack alerts and log output:

0 6 * * * cd /opt/vamp-easm && .venv/bin/python vamp_easm.py scan --target midominio.com --alert-webhook $SLACK_URL >> /var/log/vamp-easm.log 2>&1

For CI/CD, use the exit code to gate pipelines:

python vamp_easm.py scan --target example.com
EXIT=$?
if [ $EXIT -eq 2 ]; then
  echo "CRITICAL diffs detected — blocking pipeline"
  exit 1
elif [ $EXIT -eq 1 ]; then
  echo "HIGH diffs detected — review required"
fi

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Environment Variables

Variable	Description
EASM_ALERT_WEBHOOK	Webhook URL for alerts (alternative to --alert-webhook)

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Database

The SQLite database vamp_easm.db is created automatically in the working directory. It contains three tables:

• scans — one row per scan run (UUID, target, timestamps, asset/diff counts)
• assets — discovered hosts, subdomains, open ports and services with first/last-seen timestamps
• certs — TLS certificate snapshots (issuer, expiration, SANs, SHA-256 fingerprint)

The database file is excluded from version control (.gitignore). Back it up if you want to preserve historical data.

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Integration with vamp-penreport

vamp-easm exports findings in the VSL standard format used across all VampSecure Labs tools. To include EASM findings in a pentest report:

# 1. Generate JSON snapshot from the last scan
python vamp_easm.py export --target example.com --json

# 2. Merge with vamp-penreport (pass the JSON as an additional findings source)
python ../vamp-penreport/vamp_penreport.py \
  --findings easm_export_example.com_*.json \
  --client "AcmeCorp" \
  --engagement "Pentest-2026-Q3" \
  --html report_acmecorp.html

The EASM-NNN finding IDs are stable within a single scan run and can be referenced in report narratives.

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Dependencies

Package	Purpose
aiohttp>=3.9.0	Async HTTP client for subdomain source queries
rich>=13.7.0	Terminal output tables and panels
stdlib only	Port scanning, TLS inspection, DNS queries, alerts

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License

MIT License — see LICENSE for details.

© VampSecure Studios — VampSecure Labs Security Research Division
For authorized penetration testing use only.

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Versión

v1.3 — VampSecure Labs Security Research Division