Phone Phishing (Vishing) Testing

What Is Vishing?

Vishing, voice phishing, is the use of telephone calls to manipulate individuals into revealing sensitive information, performing actions, or granting access they shouldn't. Attackers impersonate IT support, executives, HR personnel, vendors, or regulators to create urgency and authority that overrides users' normal judgment.

Why Vishing Works

Phone calls activate a different psychological response than emails. The real-time, conversational nature creates pressure that email does not. Caller ID spoofing makes it trivial to appear to be calling from inside your organization. And most employees have never received vishing awareness training. They're trained to spot phishing emails, not manipulative phone calls.

How Grid32's Vishing Assessments Work

Our engineers use a range of pre-designed social engineering scenarios, adapted to your organization's structure and industry, and vary techniques based on results as the engagement progresses. Common scenarios include:

• IT help desk impersonation requesting credentials for "account verification"
• Executive or leadership impersonation requesting urgent wire transfers or information
• Vendor or supplier impersonation attempting to update payment details
• HR or payroll impersonation requesting personal employee information

Both live human calls and automated scenarios are used, as attackers use both and each produces different results. All calls are designed to be non-disruptive, typically under a minute per contact.

Common Vishing Pretexts We Test

Effective vishing relies on a believable pretext. Grid32 tests the scenarios attackers actually use: a help-desk technician resetting a password, an executive making an urgent request, a vendor confirming account details, or IT walking a user through a fake update. Each applies time pressure and authority to push staff past normal verification. The results show which pretexts work against your team and where phone-based verification procedures need reinforcing.

Frequently Asked Questions

What is vishing (phone phishing) testing?

Vishing testing uses controlled phone calls in which testers impersonate trusted parties to see whether employees reveal information, reset credentials, or grant access. It measures human risk over the phone, a channel email-only testing misses.

Why does vishing work against employees?

Voice calls create urgency and social pressure, and a convincing caller impersonating IT, a vendor, or an executive can push staff to bypass procedure. Testing reveals how susceptible your team is and where process needs reinforcing.

How does Grid32 conduct vishing assessments?

Grid32 designs realistic call scenarios within an agreed scope, attempts to elicit information or access, and reports what succeeded and why. Findings drive targeted training and stronger verification procedures for phone requests.