Clop

S0611

Malware.View on attack.mitre.org

About this malware

Clop is a ransomware family that was first observed in February 2019 and has been used against retail, transportation and logistics, education, manufacturing, engineering, automotive, energy, financial, aerospace, telecommunications, professional and legal services, healthcare, and high tech industries. Clop is a variant of the CryptoMix ransomware.

Techniques used17

Procedure examples17

TechniqueProcedure example
T1027.002
Software Packing

Clop has been packed to help avoid detection.

T1057
Process Discovery

Clop can enumerate all processes on the victim's machine.

T1059.003
Windows Command Shell

Clop can use cmd.exe to help execute commands on the system.

T1083
File and Directory Discovery

Clop has searched folders and subfolders for files to encrypt.

T1106
Native API

Clop has used built-in API functions such as WNetOpenEnumW(), WNetEnumResourceW(), WNetCloseEnum(), GetProcAddress(), and VirtualAlloc().

T1112
Modify Registry

Clop can make modifications to Registry keys.

T1135
Network Share Discovery

Clop can enumerate network shares.

T1140
Deobfuscate/Decode Files or Information

Clop has used a simple XOR operation to decrypt strings.

T1218.007
Msiexec

Clop can use msiexec.exe to disable security tools on the system.

T1486
Data Encrypted for Impact

Clop can encrypt files using AES, RSA, and RC4 and will add the ".clop" extension to encrypted files.

T1489
Service Stop

Clop can kill several processes and services related to backups and security solutions.

T1490
Inhibit System Recovery

Clop can delete the shadow volumes with vssadmin Delete Shadows /all /quiet and can use bcdedit to disable recovery options.

T1497.003
Time Based Checks

Clop has used the sleep command to avoid sandbox detection.

T1518.001
Security Software Discovery

Clop can search for processes with antivirus and antimalware product names.

T1553.002
Code Signing

Clop can use code signing to evade detection.

View all 17 procedure examples

Groups that use it1

Campaigns0

None recorded.

References3

  1. Cybereason Clop Dec 2020 Open source
    Cybereason Nocturnus. (2020, December 23). Cybereason vs. Clop Ransomware. Retrieved May 11, 2021.
  2. Mcafee Clop Aug 2019 Open source
    Mundo, A. (2019, August 1). Clop Ransomware. Retrieved May 10, 2021.
  3. Unit42 Clop April 2021 Open source
    Santos, D. (2021, April 13). Threat Assessment: Clop Ransomware. Retrieved July 30, 2021.

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