Telephone Spam, Spoofing, and Phishing


The University of Oregon has noticed a steady increase in unsolicited and undesirable telephone calls to our phone system. Many of us are experienced with email spam, but perhaps new to telephone spam. The pervasiveness of telephone spam has increased dramatically in the past year, and it continues to increase both in its frequency and severity. 

Types of Calls: What are we seeing? 


Technically speaking all of the annoying calls are Spam. Spam is any unsolicited or undesired electronic communication. 

Traditional Spam is just someone trying to sell you something. However, there tends to be a correlation between bad actors and spam. The simple truth is that one cannot know the unsolicited sales request is from a reputable party, or the true identity of the caller.  For example if someone calls you claiming to sell toner cartridges for your printer, you cannot know that they are a legitimate toner reseller.  For all you know, they will take your credit card information and never send you toner.   There is always risk in accepting an unsolicited call. 


Spoofing is the practice of changing one's caller ID. It's a form of impersonation which is relatively easy for the attacker to do. 

For example, someone claiming to be calling from the IRS can easily spoof the real IRS toll-free number as their caller ID. 

It has become common for all spam calls to to falsify their caller ID. Since they know folks are more likely to pickup a call from their own area code and region, you usually see a number that's area code 541 here in Eugene, and often including a common prefix like 541-683. 

The callers themselves are often off-shore and not in the United States which makes the crime more difficult to track down or enforce. For specific university attacks, the callers tend to spoof a 541-346 number. Historically, these were easier to detect because off-shore calls sounded distant and had static. In modern times, these phone calls sometimes sound as clear as a caller who is literally next door. This type of attack is called a Neighbor Scam.


Phishing refers to the practice of an attacker trying to get you to reveal identity or sensitive information. Typically the person phishing lies about who they are and why they want the information they are requesting. 

The attacker will try to make you act immediately and give you a false reason why you must act or answer immediately. They often threaten things like legal action or some type of fine. The end goal of this type of attack includes things like stealing identity information, or sensitive business information. 

ACTION: Hang up. Never give out information (of any kind) to an unsolicited caller.

For example, if the caller claims to be from your bank. Hang up. You can then login to your bank account online, or call your bank (notice you are calling a known number, and not speaking with the unsolicited caller). You can then ask the bank if they are trying to reach you. 

Spear Phishing

Similar to phishing, just that the attacker has taken the time to learn details about the person they are calling. 

For example, they find someone with a title of accountant, then call posing as a creditor and complaining about a late payment. 

So what can I do? 

  • First and foremost notice whom contacted whom. If you receive a contact in any form (telephone, email, etc), do not assume it is legitimate.
  • Hang up on callers who threaten you, or try to force you to reveal sensitive information. This step is the most important and sometimes overlooked. 
    • Did you make the call? Did someone call you?
    • If someone calls you, it requires a different level of caution and special handling.
  • Block the caller from your phone:
  • Depending on circumstances, you can open a case with the UO Police for any illegal call (i.e. harassment). ​​​​​​​

So what can UO Telecom do? 

UO Police can request we block a caller system-wide.   Note that we cannot block some spoofed numbers  (i.e. our own numbers).   We also cannot block calls that have no caller ID. 

Why do these folks keep calling and then hanging up on me?

The telemarketers and spammers are well organized, often having a full call center (usually outside the USA). They use a computer to dial a large amount of telephone numbers. This practice is sometimes called robo-dialing

Fortunately or not, the computers aren't always so smart and cannot detect that a human picked up the phone so it hangs up. While this is annoying, had the call actually connected you might of been met with some nasty threats intended to intimidate you into revealing sensitive information. For this reason, maybe it's best that you simply "missed their call."


Article ID: 73980
Mon 3/18/19 2:36 PM
Thu 8/24/23 3:50 PM

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This article will guide you through the steps to block a contact (i.e., spam caller, etc.)
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