Managers Are the New Bullseye
Zscaler’s ThreatLabz just published research on a single ransomware campaign that hit 351 victims across 334 organizations in one month. The detail that matters: 62% of the victims held manager-level titles or higher.
The attackers weren’t picking names at random. They targeted people in accounting, finance, HR, operations, and sales — the roles with access to invoices, contracts, payroll data, customer records, and financial approvals. Compromise a regional sales manager and you’ve got access to pricing, revenue forecasts, and customer communications. Compromise an accounts payable manager and you can disrupt payments to suppliers. Compromise a property manager and you’ve got lease agreements and client financial data.
The article recommends the usual defenses: block external calls on collaboration tools, teach employees to spot impersonation, deploy AI-powered detection, monitor for signs of compromise, adopt least-privilege access, implement zero trust segmentation.
All reasonable. None of them stop the attack at the point where it actually has to succeed: writing the malware payload to disk.
The Upstream Intervention Nobody Talks About
Ransomware has to write an encrypted version of your files to the hard drive. Malware has to write an executable payload to disk before it can run. There’s no way around either of those file operations.
FileSure Defend operates at the Windows kernel level via a filter driver. It intercepts every file operation — read, write, create, delete, rename — before it completes. You define a rule: unauthorized programs cannot write executable files to this system. A manager clicks a phishing link, the payload tries to land on disk, FileSure blocks the write operation. The file never lands. The malware never executes. The encryption never starts.
No signature update required. No waiting for your vendor to recognize the threat. A ransomware variant from this morning is stopped the same way as one from five years ago, because the product doesn’t try to recognize ransomware — it just enforces the rule about what’s allowed to happen to files.
Here’s a specific rule configuration that would have stopped this campaign:
Operation: Write, Create
File type filter: .exe, .dll, .scr, .bat, .cmd, .ps1
Program filter: Block all except explicitly authorized installers and system processes
Drive type: All local drives
Action: Block and log
That rule prevents any program except your approved software deployment tools from writing executable files to disk. The manager’s account privileges don’t matter. The sophistication of the phishing email doesn’t matter. If the payload can’t land, the attack is over.
The Data Access Problem
Even if you stop the malware installation, you’ve still got the problem the article describes: managers have broad access to sensitive files. A compromised manager account could still be used to read and exfiltrate data.
FileSure addresses that too. You can define which applications are authorized to access which files. Your accounting manager needs Excel to open the payroll spreadsheet — but Chrome and Outlook don’t need access to that file. Block browsers and email clients from reading files in your finance folder and you’ve just prevented the most common exfiltration methods.
When an unauthorized program tries to access a protected file, FileSure blocks the operation and logs it: which user, which program, which file, which machine, timestamp. You’ll know immediately that something unusual is trying to reach your data.
The article’s recommendations about network segmentation and least-privilege access are good. But they’re downstream mitigations. FileSure operates upstream — at the point where the attack has to interact with the file system to succeed.
Try FileSure Defend free for 21 days. One server, ten workstations, fully functional. See it block a simulated ransomware payload in real time. Start your trial at bystorm.com.
Source: Why managers are ransomware’s top targets now – and 6 ways to stay safe | ZDNET
Category: Ransomware
Tags: manager targeting, phishing, ransomware prevention, kernel filter driver, file system security, data exfiltration, privilege abuse, executable blocking
