The Signature Update Problem
Kaspersky’s 2025 detection systems identified an average of 500,000 new malicious files per day—a 7% increase over the previous year. The same report documented a 59% surge in password-stealer detections and a 51% spike in spyware.
Every one of those half-million daily files represents a new piece of code that antivirus vendors must analyze, signature, and distribute before their customers are protected. The article correctly identifies phishing as the primary delivery mechanism for both ransomware and general malware. An employee clicks a link in a phishing email and downloads a malicious attachment. A finance team member opens what appears to be an invoice PDF that executes an embedded script.
The problem: there’s a window between when a new malware variant is released and when your antivirus can detect it. That window can be hours or days. Attackers know this and time their campaigns accordingly.
Blocking Payload Delivery at the File System Layer
FileSure Defend doesn’t try to recognize malware. It controls what programs are allowed to do to your files at the Windows kernel level.
When a phishing email delivers a ransomware or malware payload, the email client (Outlook, Thunderbird, etc.) attempts to write an executable file to disk. FileSure intercepts that write operation before it completes.
Here’s the specific rule configuration that blocks email-based malware delivery:
File name filter: *.exe;*.dll;*.bat;*.cmd;*.ps1;*.vbs;*.js
Program name filter: *\outlook.exe;*\thunderbird.exe;*\winmail.exe
Operations: Write, Create
Drive type: Hard drives, Workstations
Result: Email clients cannot write executable or script files to local drives. Phishing attachments that attempt to drop payloads are blocked regardless of the malware variant—no signature required.
The payload never lands on disk. It never executes. Your files are never touched. This works on ransomware variants from this morning the same way it works on five-year-old malware.
Why This Matters for the 500,000 Daily Variants
The article emphasizes that not all malware seeks financial profit—motives range from data theft and system disruption to cyber espionage and ideological hacktivism. FileSure’s approach is motive-agnostic. It doesn’t matter whether the payload is ransomware, a banking trojan, a cryptojacker, or a credential stealer. If it arrives via email and tries to write an executable to disk, it’s blocked.
Most organizations run FileSure alongside their existing antivirus. Antivirus handles known threats. FileSure handles the window between “new malware released” and “signature available”—which is exactly when attacks happen.
The article notes that phishing remains the leading entry point for both malware and ransomware, making security awareness training essential. Training is important, but normal people make mistakes. FileSure operates at the layer where a single click doesn’t bypass your entire security stack.
Start your free 21-day trial at bystorm.com and see it block a simulated phishing payload in under three minutes.
Source: Ransomware vs. Malware: Key Differences and Defense | Adaptive Security
Category: Threat Intelligence
Tags: ransomware, malware, phishing, zero-day defense, kernel filter driver, payload delivery, file system security, email security
