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Ransomware Defense

Stop EmailRansomwareBefore It Strikes.

91% of all ransomware attacks start with an email. Conbool MailGuard neutralizes malware payloads before they reach your network.

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Email Ransomware Protection for Businesses: Detect and Block Threats

Email is the most common attack vector for ransomware. Conbool MailGuard combines antivirus with curated additional signatures, structural and macro analysis, and ransomware-specific heuristics to identify and block malicious attachments and links – before the message is even delivered.

The Ransomware Threat: How Attackers Strike via Email

Encryption Ransomware

Ransomware encrypts files and entire systems within minutes. A single infected email is enough to halt business operations and trigger massive ransom demands.

Email as Attack Vector #1

Malicious attachments, weaponized Office macros, and disguised download links in emails are the primary method ransomware uses to infiltrate corporate networks.

Double Extortion

Modern ransomware groups steal sensitive data before encryption and threaten to publish it – even with backups in place, the damage can be devastating.

Comprehensive Email Ransomware Protection

Conbool MailGuard deploys multiple layers of defense to reliably intercept ransomware before delivery.

Pre-Delivery Scanning

Every inbound email is analyzed before delivery. Suspicious messages containing potential ransomware payloads are blocked before they reach the inbox.

Deep Attachment Analysis

Attachments are unpacked recursively, decompressed and inspected for malicious macros, scripts and executables, regardless of file type and with a depth limit against archive bombs.

URL protection at click

Links in emails are rewritten and checked against Spamhaus DBL, zero-reputation domains and PhishTank at the time of click, before the browser opens the target page.

Signatures from several sources

ClamAV checks every attachment and every URL against curated signature sources such as SaneSecurity, Porcupine and URLhaus. The scan limit follows the scanner itself rather than a limit of our own. rspamd scoring and attachment sanitisation add structural and macro analysis on top.

Zero-Hour Alerts

Behavior-based detection identifies novel ransomware variants within minutes – even without an existing signature. Instant notifications keep your IT team informed.

Ransomware-Specific Heuristics

Specialized detection rules analyze typical ransomware patterns such as suspicious file extensions, encryption routines, and command-and-control communication.

Why Traditional Antivirus Fails Against Email Ransomware

Conventional antivirus solutions only detect known signatures. Email-borne ransomware deliberately leverages zero-day exploits and polymorphic payloads that evade signature-based scanners.

Signature-Based vs. Behavior-Based

Traditional AV scanners only detect malware with known signatures. Conbool MailGuard additionally strips macros and active content from Office and PDF files, stopping loaders for which no signature exists yet.

Several signature sources rather than one

A single signature set only catches what is already known. MailGuard checks with ClamAV against several curated sources such as SaneSecurity, Porcupine and URLhaus, and adds rspamd scoring and attachment sanitisation. A second scanner with its own signature set is deliberately not in use.

Pre-Delivery vs. Post-Delivery

Traditional endpoint solutions only act once the file is already on the device. Conbool blocks ransomware before it even reaches the inbox.

Recognising a wave in progress

A new campaign often spreads within hours. Once one message from it is confirmed as a threat, our own fingerprint store learns it, and further messages of the same wave are recognised by it, with no signature involved. How fast that takes effect depends on the first report, not on a promised time.

FAQ

How does Conbool MailGuard protect against email ransomware?
Conbool MailGuard scans every inbound email before delivery using ClamAV with curated additional signatures, unpacks attachments and strips macros and active content, and checks links for malicious targets at the time of click. Suspicious emails are blocked before they reach the mailbox.
What happens to emails detected as ransomware?
Detected ransomware emails are automatically quarantined. Administrators are notified immediately and can review, release, or permanently delete the email in the admin panel.
Does Conbool MailGuard detect ransomware without a known signature?
Yes. In addition to signature-based scanning, Conbool MailGuard uses behavior-based analysis and ransomware-specific heuristics. This enables detection of novel variants for which no signature exists yet.
Does ransomware protection work with Microsoft 365?
Yes, Conbool MailGuard integrates seamlessly as an upstream email filter for Microsoft 365 and Exchange Online. All email traffic is analyzed before it reaches Microsoft 365.
How quickly are new ransomware threats detected?
In part, and the ways are nameable. Sanitisation removes macros and active content whether or not the payload is known. Our own fingerprint store recognises further messages of a wave as soon as one of them is confirmed as a threat. What neither path covers and no signature knows will get through: there is no detection guarantee, and anyone promising one cannot keep it.
Does Conbool MailGuard replace our existing endpoint security?
No, Conbool MailGuard complements your existing endpoint security as an additional layer of defense. Pre-delivery scanning blocks ransomware before it reaches the endpoint, relieving your endpoint solution and providing defense-in-depth.

Stop Email Ransomware Starting Today.

Protect your business from email-borne ransomware with Conbool MailGuard. Try free – no credit card, no risk.

Start free trialRequest a demo
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