Recommended Free Tools
If you opened an unexpected HR attachment containing a VHDX disk image and a spreadsheet-looking shortcut, stop interacting with it and contact your IT administrator now. Preserve the email and attachment for responders. The icon and filename do not prove that the shortcut was a spreadsheet—or that it ran anything. Whether your device or accounts were affected depends on what you opened, what executed, and what the investigation finds.
First, what did you actually open?
“I opened a fake HR spreadsheet—what should I do?” The answer depends on the exact steps you took. A VHDX is a virtual hard disk file: it can contain other files, but receiving or downloading one does not, by itself, establish that its contents ran. A shortcut file can display a familiar spreadsheet icon and name while pointing somewhere else or invoking a command.
As an Amazon Associate I earn from qualifying purchases.
Do not open the attachment again, mount the disk image, or click the shortcut to check what it does. On a work device, tell IT whether you only received the email, downloaded the VHDX, mounted it, opened the shortcut, or entered credentials. If you are unsure, say so rather than guessing.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
What to do now
- Contact your IT administrator or security team. Use a known work contact method, not contact details in the suspicious email. Microsoft advises work users to contact their IT administrator after a suspected phishing attack: Microsoft’s phishing guidance.
- Stop interacting with the attachment. Leave it available for the response team; do not delete or forward it unless IT instructs you to. Keep the original email, including its attachment and message details.
- Report the message through your organization’s normal reporting channel. Microsoft recommends reporting suspicious messages through the appropriate channel: Microsoft’s guidance on identifying and reporting phishing.
- If you entered a password, tell IT immediately. Microsoft’s general guidance recommends changing passwords associated with accounts after a suspected phishing attack. Coordinate with your organization so responders can secure the account and advise you on the safest way to change it.
If the device is managed by your employer, follow the security team’s instructions about disconnecting it from networks or shutting it down. Avoid making that decision on your own if you can reach IT promptly; preserving evidence and limiting further activity both matter.
#1 Best Overall
- POWERFUL SECURITY KEY: The Security Key C NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key C NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key C NFC via USB-C and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Can a spreadsheet shortcut run malware?
It can be disguised to look like a document, but the appearance alone does not tell you what it does. A Windows LNK shortcut includes metadata such as an icon and target fields. MITRE ATT&CK documents how attackers can abuse shortcut metadata, stating: “Adversaries may abuse this LNK metadata to download malicious payloads.” Its T1027.012: LNK Icon Smuggling entry describes antimalware detection and endpoint behavior prevention as mitigations.
Microsoft also describes shortcuts made to resemble text documents or PDFs while targeting PowerShell or Command Prompt with obfuscated arguments. That is a general example, not evidence about this attachment. Without examining the file and endpoint activity, the shortcut’s target, arguments, payload, and outcome remain unknown. A spreadsheet-like icon is not proof that the file is a spreadsheet.
Rank #2
- POWERFUL SECURITY KEY: The YubiKey 5C NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5C NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5C NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Is a VHDX file dangerous?
VHDX is a virtual disk format, not proof of malware. A disk image can serve as a container for other files, which is why its contents and what a user does with them matter. Sophos documented a related phishing chain observed by its MDR team in August 2022: an email, a WeTransfer download link, a VHD file, an LNK shortcut, a PowerShell file, and a malicious DLL. Sophos discussed disk images and archives as formats attackers have used to smuggle code past gateway scanners and execute it. This historical example shows that the delivery pattern is plausible; it does not establish what happened on your device or how common the tactic is today. Sophos: Container smuggling.
What should you tell IT after clicking it?
Give responders a factual timeline, including what you remember and what you do not. This helps them determine whether the message was only received or whether the disk image, shortcut, or an account was involved.
Rank #3
- POWERFUL SECURITY KEY: The YubiKey 5 NFC is the most versatile physical passkey, protecting your digital life from phishing attacks. It ensures only you can access your accounts
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
- When the email arrived and when you interacted with it.
- Whether you downloaded the VHDX, where it was saved, and whether you mounted or opened it.
- Whether you clicked the shortcut or opened any other file inside the image.
- Whether you saw a prompt, window, warning, or unexpected behavior; describe it without reopening anything to reproduce it.
- Whether you entered a password, approved a sign-in request, or provided other information, and which account was involved.
- Whether you used the same password elsewhere, if relevant to the affected account.
- Who else received the message, if you know.
Do not claim that malware ran or credentials were stolen unless you have evidence. The sequence of events and the investigation—not the attachment’s appearance—will establish what occurred.
What the investigation needs to establish
Microsoft’s phishing playbook calls for identifying the message, scoping affected users, assessing interaction and credential exposure, and investigating downstream activity. For this incident, responders should determine whether the file was downloaded or mounted; whether the shortcut was opened; what process, if any, followed; and whether there were related network connections or signs of persistence. They should also check for exposed credentials, other recipients, and affected accounts. These are investigation questions, not assumptions that compromise occurred. Microsoft incident response playbook: Phishing.
Rank #4
- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
Successful phishing can lead to credential compromise, malware execution, data exfiltration, or lateral movement, according to Microsoft. Those are risks to investigate, not confirmed outcomes in this case. The response team can use email, endpoint, and identity records to assess whether any of them occurred.
How organizations can reduce this risk
Controls work at different points in the chain; none of the cited sources establishes a ranking among specific products. Organizations can combine:
Best Value
- Security Key : Protect your online accounts against unauthorized access by using FIDO2 and U2F authentication with T110. It's the world's most protective security key that works with windows, Mac OS, Linux as well as Chrome, Firefox, Edge and many other major browsers.
- Certified with the new FIDO2 standard, T110 provides the benefit of fast login and strong protection against phishing, account takeover as well as many other online attactks.
- Works with : Bank of America, Github, Google, Microsoft, DUO, Twitter, Facebook, Dropbox, Apple, ebay, BINANCE, mor and more.
- Fits USB-A port : Insert the T110 security key into the USB-A port of each service and log in conveniently with one touch
- For the driver download and user guide, please visit TrustKey Solutions Home support page.
- Email and attachment inspection: assess suspicious messages and attachments before delivery, while recognizing that container formats have been used to evade gateway scanning.
- Endpoint protection: use antimalware detection and behavior prevention to identify suspicious files and activity after delivery.
- Employee awareness and reporting: train staff to verify unusual or urgent HR requests through a known channel and make suspicious messages easy to report. Microsoft recommends checking suspicious communications through known channels and educating employees: Microsoft’s phishing guidance.
- Investigation coverage: ensure responders can connect email, endpoint, and identity evidence to scope recipients, user actions, and possible downstream activity.
For employees, the practical check is simple: an HR label is not authentication. Verify unusual requests through a contact method you already trust, not a link, address, or phone number supplied by the message.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
