Understanding Clop Ransomware


Clop is a ransomware-type virus that belongs to the CryptoMix family. The word ‘Clop’ itself means ‘bug’ in Russian. The virus is mostly aimed at English-speaking users and tends to target complete networks instead of individual users.

Clop ransomware infects systems running on the Microsoft Windows platform. It has been designed to encrypt data and rename every file by appending the ‘.clop’ extension. After successful encryption of files, Clop generates a text file containing the ransom message and places its copy in every existing folder. Another unique character of Clop ransomware is the string ‘Dont Worry C|0P’ included in the ransom note. The decryption keys are stored on a remote server controlled by cyber criminals. This makes it necessary for every victim to pay the ransom in order to get the decryption key.

What Is The Payload Used For Clop Ransomware?

Transmission:

The Clop ransomware is distributed in the form of an executable that has been a code-signed digital signature. It makes the executable appear more legitimate and helps it in bypassing the system security.

The virus infection is spread through a macro or JavaScript attachment in a spam email. Sometimes, the virus may be delivered as a downloadable link in an email. Other ways of spreading the Clop ransomware include exploit kits, malwertizement, and compromised websites.

Execution:

After infection, the virus first stops the Windows services and programs to ensure the disabling of antivirus software such as Windows Defender etc. Additionally, it closes all the files so that they are ready for encryption. For disabling the Windows Defender, the virus configures various Registry values that disable behavior monitoring, real time protection, sample uploading to Microsoft, Tamper protection, cloud detections, and antispyware detections. In the case of older computer systems, Clop uninstalls Microsoft Security Essentials to surpass the security.

After terminating processes, it creates a batch file, which is executed soon after the ransomware is launched. The batch file disables windows automatic Startup repair. The ransomware then starts encrypting the files on the victim system and adds the ‘.Clop’ extension to the name of encrypted files.

The ransom note is created under the name ‘ClopReadMe.txt’ and a copy is placed in every folder.

How To Stay Protected?

  • Use an updated version of antivirus.
  • Scan the spammed mails.
  • Avoid clicking on unidentified links, advertizement or websites.
  • Create regular backups of the files.

For more information on how to secure your network for various threats, contact Centex Technologies at (254) 213 – 4740.

 

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