Automating Discovery with a pcANYWHERE Hosts Scanner — Tools & TipspcANYWHERE is a legacy remote-control application that was widely used in the 1990s and early 2000s. Despite its age, instances of pcANYWHERE (and similar legacy remote-access services) can still appear on corporate networks and the public internet, often with insecure configurations or unpatched vulnerabilities. Automating discovery of such hosts—responsibly and legally—helps defenders locate exposed systems, prioritize remediation, and reduce attack surface. This article explains the goals, legal/ethical boundaries, discovery techniques, tools, automation strategies, and operational tips for scanning for pcANYWHERE hosts safely and effectively.
Why discover pcANYWHERE hosts?
- Risk reduction: Old remote-access services commonly lack modern security defaults. Unpatched or misconfigured pcANYWHERE installations can allow unauthorised access.
- Asset inventory: Legacy apps often slip through inventories. Discovery helps create a complete view of remote-access services on your network.
- Prioritization: Identified hosts can be assessed for exposure and criticality, allowing targeted patching, configuration changes, or decommissioning.
- Incident readiness: Knowing where such services are reduces mean time to respond if exploitation is attempted.
Legal and ethical considerations
Before scanning, obtain explicit authorization. Scanning networks or hosts you do not own or administer can be illegal or violate terms of service. For internal corporate engagements, ensure you have written permission (a signed scope statement or similar). If you plan to scan public IP ranges (e.g., for research), follow responsible disclosure practices and respect robots.txt-style policies where applicable.
- Always have written authorization.
- Avoid techniques that could disrupt services (e.g., intrusive exploits or heavy concurrent probes).
- Rate-limit scans to reduce accidental impact.
- Follow disclosure policies if you find vulnerabilities on third-party systems.
How pcANYWHERE discovery works (technical overview)
pcANYWHERE communicates using a somewhat proprietary protocol and historically listened on TCP ports such as 5631 (control) and 5632 (file transfer) by default, though administrators could change them. Discovery usually relies on:
- TCP port scanning to find hosts listening on common pcANYWHERE ports.
- Banner grabbing to identify the service and version string.
- Protocol fingerprinting to distinguish pcANYWHERE traffic from other services using the same ports.
- Credentialed checks (only when authorized) to validate whether the service is active and configured insecurely.
Because default ports can change, discovery sometimes requires broader heuristics: scanning for responders to pcANYWHERE-style handshakes, looking for telltale protocol behaviors, or checking for files and processes on hosts when credentialed access is allowed.
Tools you can use
Below is a concise list of common and reliable tools for automated discovery and how they apply to pcANYWHERE scanning:
- Nmap — network scanner with scripting engine (NSE). Use port scans and NSE scripts to detect pcANYWHERE banners and protocol responses.
- masscan — extremely fast port scanner for large IP ranges; combine with targeted Nmap scans for in-depth detection.
- ZMap — alternative fast scanner, useful for large-scale research (use responsibly).
- tshark/Wireshark — analyze packet captures to validate protocol fingerprints and troubleshoot false positives.
- custom scripts (Python/Scapy) — for crafting pcANYWHERE-specific probes or parsing vendor-specific banners.
- Vulnerability scanners (Nessus, OpenVAS) — can detect known pcANYWHERE versions and associated CVEs; use in authenticated mode when possible.
- Endpoint management tools (OS inventory agents, EDR) — for credentialed discovery, locating installed pcANYWHERE binaries or services.
Example workflows
- Fast external sweep (large ranges)
- Use masscan or ZMap to quickly find hosts with TCP ports ⁄5632 open.
- Feed results into Nmap for service detection and banner grabbing.
- Triage by country/ASN/owner and notify responsible parties.
- Internal network discovery (authorized)
- Use Nmap to scan internal ranges, combining -sV and relevant NSE scripts.
- Run credentialed checks (SSH/WinRM) to inspect installed services, running processes, and config files to confirm pcANYWHERE presence.
- Use EDR or inventory databases to reconcile hostnames and owners.
- Deep verification and risk scoring
- If authorized, attempt authenticated connection using known vendor tools or safe probes to validate version and configuration.
- Map each host to a risk score (internet-facing, unpatched CVE, weak auth, critical business function).
- Prioritize remediation (patch/uninstall/block ports/segmentation).
Practical Nmap examples
Use Nmap only with permission. Example command patterns:
-
Quick service/version scan on common pcANYWHERE ports:
nmap -p 5631,5632 -sV --version-intensity 2 target-range
-
Aggressive detection with NSE scripts (replace with authorized scripts):
nmap -p 5631,5632 --script=banner or --script=my-pcanywhere-detect target-range
-
Large-result triage (feed masscan into Nmap):
masscan -p5631,5632 198.51.100.0/24 --rate=1000 -oG masscan-results.txt cat masscan-results.txt | awk '/open/{print $2}' > targets.txt nmap -sV -p5631,5632 -iL targets.txt -oA pcanywhere_nmap
Building an automated pipeline
Automating discovery helps maintain continuous visibility. A basic pipeline:
- Scheduling: run fast scans weekly (internal) or with a cadence that balances load and timeliness.
- Detection: masscan/ZMap → Nmap for verification.
- Enrichment: add WHOIS/ASN, DNS PTR, and asset owner metadata.
- Scoring: apply rules for exposure (internet-facing, default ports, known CVEs).
- Remediation tickets: auto-create tickets in your ITSM (Jira, ServiceNow) with evidence and recommended actions.
- Tracking: close loop when remediation/mitigation is complete and rescan to verify.
Use containers or serverless functions to run scanning and processing jobs so you can scale and control resources easily.
Mitigation and remediation recommendations
- Uninstall or decommission pcANYWHERE where possible. Replace with modern, supported remote-access tooling that enforces MFA and secure transport.
- If you must keep pcANYWHERE:
- Restrict access with network segmentation and firewall rules (allow only known management subnets).
- Move services off default ports only as a defense-in-depth step (not a primary control).
- Require VPN or zero-trust broker for remote connections.
- Apply vendor patches where available; prioritize hosts with public exposure.
- Use strong, unique credentials and MFA where supported.
- Monitor for anomalous connections and authentication failures.
False positives and validation
- Expect false positives when scanning only by port numbers—other services may use the same ports. Always follow with banner grabs or protocol-level probes.
- Validate findings with credentialed checks or local inventory queries where possible.
- Review packet captures when unsure; pcANYWHERE protocol sessions have recognizable handshake patterns you can fingerprint.
Operational tips and pitfalls
- Rate-limit probes to reduce impact; increase parallelism gradually.
- Coordinate with network teams and service owners to avoid triggering alerts or causing outages.
- Keep records of scan windows and targets for auditability.
- Be cautious with public scanning (ZMap/masscan) — many networks consider unsolicited scans hostile.
- Update detection signatures and scripts as you learn new fingerprints or port variations.
Conclusion
Automated discovery of pcANYWHERE hosts is a high-value activity for defenders maintaining secure networks, particularly when legacy services may be forgotten and exposed. The key pillars are authorization, careful scanning techniques (fast discovery + deep verification), thoughtful automation pipelines, and clear remediation paths. When performed responsibly, scanning reduces risk by surfacing legacy remote-access services so they can be patched, reconfigured, or removed.
If you want, I can produce: a ready-to-run Nmap NSE script skeleton for pcANYWHERE detection, a CI/CD-friendly scanning pipeline (Dockerfile + job config), or a customizable detection playbook for your SOC—tell me which one.