What is Clop?
Clop (S0611) is a ransomware and data extortion malware strain, heavily deployed by sophisticated cybercriminal networks like TA505 and FIN11.
First appearing in 2019 as a traditional encryptor, the malware’s operators have since shifted their strategy. They now use Clop primarily for massive data theft and pure extortion campaigns rather than standard network encryption.
The operators of this malware are notorious for exploiting zero-day vulnerabilities. They target enterprise file-transfer applications like MOVEit and GoAnywhere to breach hundreds of organizations simultaneously. Once deployed inside a network, the malware terminates protective processes to bypass security tools.
The attackers steal vast amounts of sensitive company data. They demand a ransom and threaten to publish the files on their dark web leak site. If attackers use the encryption payload, Clop also deletes local volume shadow copies to prevent easy data restoration.
How to Defend Against Clop?
Defending against Clop requires strict vulnerability management, secure network architecture, and continuous monitoring.
- Patch external systems: Clop actively exploits vulnerabilities in file-transfer software. Apply vendor patches immediately and isolate these servers from your core network. Use Lumu Discover to find weaknesses in your attack surface.
- Maintain offline backups: Attackers often deploy the encryption payload and destroy local backups. Store critical data offline to ensure quick recovery without paying a ransom.
- Deploy endpoint detection: Monitor devices for suspicious administrative activity. Flag any process that attempts to terminate security software or disable system defenses.
- Use network detection (NDR): Use tools like Lumu Defender to identify unauthorized data exfiltration. Detect anomalous data transfers to external servers before the theft completes.
- Integrate threat intelligence: Use platforms like Lumu Maltiverse to stay updated on the latest Clop indicators and block access to malicious domains.
