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Well, most malware produces suspicious and unusual activity. &nbsp; Like a changed start page in Safari. &nbsp;Also redirects, popups and other behaviour that is not normal.<br />
if you want to check the machine for malware, then I highly recommend downloading <a href="https://www.malwarebytes.com/lp/sem/en/mac/index-dSC=en.html" rel="ugc">Malwarebytes for Mac</a>.<br />
Download/install/run full scan. &nbsp;Remove/quarantine what it recommends.<br />
This is a 14 day trial, and if you want you can buy the full package for the price of 3 lattes/year.
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Fractional CTO

David Favor

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Unlikely there's any problem.<br />
<br />
You'd likely have to execute some code to install Malware.<br />
<br />
So if you read an email, then double clicked on an attachment, then gave permission to install the payload, then run the payload...<br />
<br />
You'd have a problem.<br />
<br />
If you did all this, likely you'd remember.<br />
<br />
And if you're concerned, run MalwareBytes as Michael suggested above.
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Thanks.<br />
I ran MalwareBytes and it found a questionable file that I removed.<br />
Is there a logging system to see what has been installed in the last 10 days?<br />
I can then discern if I clicked on one of those?
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Self Employed

James Hancock

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Hi<br />
I’m staying in a hotel and I opened my MacBook, without thinking. I entered my room number and such to acquire WiFi <br />
<br />
How can I tell if it has been infected w backdoor software?<br />
Thanks <br />
I think I looked at my email
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Hi
I’m staying in a hotel and I opened my MacBook, without thinking. I entered my room number and such to acquire WiFi 

How can I tell if it has been infected w backdoor software?
Thanks 
I think I looked at my email

How can I tell if my MacBook has been infected during Hotel stay?

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Software

Wireless networking is anything related to the transfer of data between two (or more) devices without the use of a physical connection, ranging from getting advice on a new Bluetooth headset to configuring sophisticated enterprise level networks.

Wireless Networking

Anti-virus software was originally developed to detect and remove computer viruses. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious layered service providers (LSPs), dialers, fraud tools, adware and spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity theft (privacy), online banking attacks, social engineering techniques, Advanced Persistent Threat (APT), botnets and DDoS attacks.

Anti-Virus Apps

Spyware is software that aims to gather information about a person or organization without their knowledge and that may send such information to another entity without the consumer's consent, or that asserts control over a computer without the consumer's knowledge; it has also come to include programs that engage in various kinds of electronic fraud. Anti-spyware is software that removes or blocks that software; some common vendors include Malwarebytes, McAfee, Spybot-Search and Destroy, Ad-Aware and BitDefender.

Anti-Spyware

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.