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Invoice #INV-2025-0417 - payment overdue, action required

Inbox

Vendor Payments Dept <accounts@suppliers-payment-india.co>

to me ▾

10:24 AM (2 minutes ago)

Respected Sir,

This is a reminder that your April invoice of ₹84,500 is still pending against your account. Kindly clear the outstanding amount within 24 hours to avoid late-payment charges and a hold on future supply.

The complete bill with the breakup is attached for your reference. Please open the attachment and confirm payment at the earliest.

Regards,
Accounts & Payments Team
Vendor Payments Pvt. Ltd.

Invoice_April_2025.pdf
512 KB

What just happened

A short, plain-language debrief of the attack you just watched - and exactly how to make sure it never happens to your business.

1 What this attack looked like

An ordinary-looking Gmail inbox received an email titled "Invoice - payment overdue". It pretended to be from a supplier and pushed you to act in 24 hours. You opened the attached "invoice", and the moment it ran, hidden code silently locked every file on the computer - invoices, salary sheets, the customer database, photos - and replaced the screen with a ransom demand and a countdown timer. One click was all it took.

2 Red flags - how to spot it

Unexpected invoice / urgency: "pay within 24 hours" exists to rush you past your judgement.
Look-alike sender: accounts@suppliers-payment-india.co is not your real vendor's address.
An attachment you didn't ask for - especially one that wants to be "opened" or "enabled".
Disguised file types: a real bill is a plain PDF, never a program (.exe, .scr), a double-extension like Invoice.pdf.exe, or a "macro-enabled" document asking you to Enable Content.

3 Best practices - prevent it

Backups are the cure - follow 3-2-1: 3 copies of important data, on 2 kinds of storage (e.g. an external disk + cloud), with 1 copy kept offline / off-site. If files lock, you simply restore - no ransom.
Never open unexpected attachments or links; verify with the sender on a known phone number first.
Beware double extensions & macros (.pdf.exe, "Enable Content" prompts).
Keep Windows and all software updated - updates close the holes ransomware sneaks through.
Run reputable anti-malware / EDR and let it auto-update.
Limit admin rights - staff should use standard accounts for daily work.
Disable or secure remote access (RDP) with strong passwords + MFA, and segment your network so one infected PC can't reach everything.
Train your team - most attacks start with one person clicking.

4 If you've already been hit - remediation

Disconnect immediately - unplug the network cable / turn off Wi-Fi to stop it spreading.
Isolate other devices and any shared/backup drives.
Do NOT pay and do NOT wipe the machine yet - payment rarely works and funds crime.
Photograph the ransom note and note the file extensions (helps identify the strain).
Restore from a clean, offline backup after the network is secured.
Change all passwords from a clean device and enable MFA.
Report it: CERT-In (incident@cert-in.org.in), and the cybercrime helpline 1930 / cybercrime.gov.in.
Get professional help if business-critical data is involved.

96%

of Indian firms hit by ransomware had to seek outside help to recover.

Source: cyber suraksha deck · Threat 02