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version 26.5.1 · Western Australia · Est. 2011·Microsoft Partner & Reseller · HP, Yealink, Ubiquiti, Kyocera
— Stay safe · Web browsing

When a download looks tempting, look twice.

The single click that costs you a week of cleanup almost always looks innocent. Here's how to spot the lure.

Antivirus is good now. Browser security is good now. The biggest remaining attack vector is the user clicking Download on a file they shouldn't have. Modern malware is almost always delivered by a willing click, not by a vulnerability — which means the only fix is a brief moment of suspicion before you save and open.

94%
Of ransomware infections trace to a user-initiated download
3 sec
Average time between download and double-click
$1.5M
Median ransomware demand on an Australian SMB, 2025
// FILE TYPE #1

.exe, .msi, .scr, .bat, .ps1 — never run if you didn't go looking for them.

These are programs. If you arrived at a webpage and it offered you one of these, walk away. Legitimate software downloads come from the vendor's own site, not from a popup. If you genuinely need a free tool, type the tool's name into Google, click the result that goes to the vendor's domain, and download from there.

// FILE TYPE #2

Office files asking to Enable Macros / Enable Content.

A Word doc, Excel sheet, or PowerPoint that prompts you to Enable Content is asking permission to run code. Real documents don't need to do this. The prompt itself is the warning sign. Close the file and ask whoever sent it whether they intended it — using a known phone number, not the email reply.

// FILE TYPE #3

.zip or .rar attachments from outside your company.

ZIPs hide what's inside until you open them. Attackers use them because they bypass most email gateway scanners. If an external email contains a ZIP, treat it as a high-risk attachment by default. If the sender is genuine, they can resend the file uncompressed.

// FILE TYPE #4

.lnk shortcuts and .iso disc images.

Two newer tricks: .lnk Windows shortcuts that quietly run a hidden script, and .iso files that mount as a drive and contain a hidden executable. Both bypass Microsoft's Mark-of-the-Web protection. If you see either as an email attachment, delete the email — there is no legitimate reason a supplier emails these.

// FILE TYPE #5

PDFs asking you to log in to view the content.

A PDF that opens and tells you to click a link to log in to DocuSign / SharePoint / Microsoft to see the real document is phishing. Real DocuSign and SharePoint emails come from those services directly, not as PDF attachments. Close the PDF, delete the email.

// THE OVERRIDING RULE

If you weren't expecting it, don't open it.

Whether the sender is your accountant, your supplier, your manager, or a client — the rule is the same. Unexpected attachment, no matter how plausible the subject line, gets a 60-second verification call before it gets opened. The person sending it doesn't mind being called. The criminal pretending to send it doesn't answer the phone.

Related safety reading.

Dodgy downloads are usually the last step of a longer scam. Catch it earlier with the rest.

Already opened something you shouldn't have?

If you've just clicked or run something that worries you, disconnect from the network (turn off WiFi, unplug ethernet) and call us. The first hour of an incident determines how bad it gets — we'll triage with you live.

+61 421 346 887
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