Have you ever heard of “Vishing”?
Vishing is voice phishing conducted over Voice over Internet Protocol (VoIP) systems, where attackers impersonate banks, vendors, IT staff, or executives to extract credentials, financial details, or customer data. Unlike a robocall pitching a car warranty, a vishing call is targeted, scripted, and timed to catch employees when they’re least likely to verify the caller. For small and mid-sized businesses in Pittsburgh and beyond, it has become one of the most reliable ways for criminals to bypass otherwise solid technical defenses.
What makes vishing so attractive to attackers?
VoIP is cheap to set up and hard to trace
Spinning up a VoIP calling operation requires almost nothing. An internet connection, off-the-shelf software, and a credit card. That accessibility is half the appeal.
The other half is anonymity. A single call can be routed through servers in multiple countries before reaching the victim, leaving a trail that crosses jurisdictions and complicates any investigation. By the time authorities untangle the path, the operation has usually moved on.
Why is VoIP so cost-effective for scammers?
Traditional long-distance calling at scale used to be expensive enough to limit the size of a fraud campaign. VoIP removed that ceiling. Internet-based calls cost a fraction of a cent each, so an attacker can dial thousands of numbers in a single day for the price of a coffee.
Even a conversion rate well under one percent produces a worthwhile return at that volume. The economics work in the attacker’s favor before a single call connects.
How easy is it to spoof a caller ID?
Caller ID spoofing is one of the defining features of VoIP-based fraud. A traditional landline number was tied to a physical line and a regulated carrier. A VoIP number is a software entity that can be provisioned in minutes and configured to display any number or name on the recipient’s phone.
That means a call claiming to be from your bank, your IT provider, or your own CEO can look completely legitimate on screen. Most people answer a familiar number without hesitation, which is exactly the behavior attackers count on.
How can a business protect itself from vishing?
Write clear communication policies and enforce them
The single most effective protection is a written policy that defines how sensitive information can and cannot move through phone conversations. Any request involving financial data, login credentials, customer records, or wire transfers should require verification through a separate channel before anything is disclosed.
That verification can be straightforward. Hanging up and calling back on a number published on the company website. Confirming through an internal messaging tool. Escalating to a supervisor named in the policy. The mechanism matters less than the rule itself: no caller, however convincing, gets sensitive information on the first contact.
Policies only work when employees know about them, so the document needs to live somewhere accessible and be referenced during onboarding and refresher training.
Train people to recognize urgency as a warning sign
Vishing scripts almost always manufacture pressure. A “fraud department” calling about a suspicious transaction that needs to be reversed in the next ten minutes. An “executive” demanding an emergency wire transfer before a deal closes. An “IT technician” needing remote access to fix an outage before the workday starts.
Urgency short-circuits judgment, which is the whole point. Employees who have seen the pattern before are far more likely to slow down and verify than employees encountering it for the first time on a real call.
Training should include realistic examples of spoofed caller IDs, recorded vishing audio where available, and walkthroughs of recent attack patterns. Equally important is the culture around verification. If employees worry about looking paranoid or annoying a senior colleague by double-checking, they will skip the step. Leadership has to back the behavior they want, which means treating a verification step as a normal part of the job rather than an inconvenience.
Layer technical defenses on top of awareness
Awareness and policy reduce risk, but they don’t eliminate it. Technical controls add a second line of defense by filtering or flagging suspicious calls before they reach an employee.
Modern call-screening systems analyze calling patterns rather than relying on static blocklists. They can detect a surge of calls from an unfamiliar region, identify numbers associated with previous fraud campaigns, and apply caller authentication standards like STIR/SHAKEN, which verify that a calling number hasn’t been spoofed. STIR/SHAKEN is a framework mandated by the FCC for U.S. voice carriers and gives downstream systems a way to mark calls as verified, partially verified, or unverified.
Monitoring tools sit alongside these systems and give visibility into trends across the organization. A sudden spike in inbound calls to the finance team, for example, is the kind of signal that doesn’t show up at any individual desk but is obvious in aggregate.
When to bring in outside help
Most small and mid-sized businesses don’t have a dedicated voice security team, and they don’t need one. What they do need is a managed services partner who can assess the current setup, identify gaps, configure call-screening and authentication properly, and run simulated vishing exercises to test the human side of the defense.
CyberJaz works with small and mid-sized businesses across the Pittsburgh region on exactly this kind of layered protection. To talk through a vishing assessment or strengthen your current phone-system defenses, reach out to our team today.
FAQ
What is vishing?
Vishing is phishing carried out over a voice call, usually via VoIP, where the attacker impersonates a trusted party to extract sensitive information. It differs from email phishing in that the social engineering happens in real time during the conversation.
How is vishing different from a regular robocall?
Robocalls are broad, automated pitches aimed at consumers. Vishing calls are targeted, often involve a live human operator, and are designed to extract specific information such as credentials, financial data, or access to systems.
Can caller ID be trusted?
No. Any caller ID can be spoofed on a VoIP system, so the displayed number or name should never be treated as proof of identity. Sensitive requests need verification through an independent channel.
What is STIR/SHAKEN?
STIR/SHAKEN is a caller authentication framework required of U.S. voice carriers by the FCC. It lets carriers cryptographically attest that a calling number has not been spoofed and passes that attestation downstream so calls can be marked verified or unverified.
Who is most at risk from vishing?
Finance teams, executive assistants, IT help desks, and customer service staff. Any role with access to sensitive data or the authority to move money is a high-value target.
