Malware · critical

How to fixCLOP_RANSOMWARE

Clop Ransomware (MOVEit Exploit)

What this error means

Clop Ransomware (MOVEit Exploit) ranks as a critical-severity malware/security issue in our database. Clop is a ransomware family known for pioneering large-scale data extortion campaigns. It famously exploited zero-day vulnerabilities in managed file transfer (MFT) software, such as MOVEit Transfer (CVE-2023-34362), to steal data and demand ransom without initially encrypting systems. It's also often linked to direct exposure of administrative panels to the public internet. The steps below are ordered to resolve this efficiently.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 4 complete
01Apply security updates for MFT software immediately

Apply security updates for MFT software immediately.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Isolate and disable vulnerable application components

Isolate and disable vulnerable application components.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Monitor network logs for large outgoing data transfers (data exfiltration)

Monitor network logs for large outgoing data transfers (data exfiltration).

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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04Deploy web application firewalls (WAF) to filter malicious payloads

Deploy web application firewalls (WAF) to filter malicious payloads.

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • Unpatched web applications and managed file transfer systems (MOVEit, Accellion)
  • Direct exposure of administrative panels to the public internet
  • Weak credential management on file hosting servers