Ransomware Research



CXK-NMSL was first discovered in July 2019 in enterprise cloud environments. CXK-NMSL is found in environments with a number of different names, including ChineseBAT, etc. For a full list of all names, please see below.

  • ChineseBAT
First Seen July 2019

Behavior of CXK-NMSL

CXK-NMSL is known to target specific file types. Below are all known file types that CXK-NMSL is known to infect.

In some cases, ransomware will update the modified date, when it encrypts files. CXK-NMSL updates the last modified date of the file it targets.

Learn More

Characteristics of CXK-NMSL

Here are some of the unique characteristics that are helpful to know about CXK-NMSL.


Some ransomware will change or append a suffix to the end of the file after they are encrypted, including changing the extension of a file. Here are some of the possible suffixes that CXK-NMSL ransomware is known to change.

Suffixes.cxk_nmsl, .cxkdata

Ransomware Notes

Not all ransomware leaves a note. However, some ransomware leaves the infected party instructions on what the user should do to get rid of the ransomware, or satisfy the ransom. This often involves transferring money, often bitcoin or another cryptocurrency to a designated wallet.

Below are the type(s) of notes, content, and typical locations where Elastio has found ransom notes from CXK-NMSL.



These are the names of the executables that contain the undetonated ransomware payload for CXK-NMSL.

ExecutablesCXK-NMSL.bat, CXK-NMSL%20V2.0.bat, CXK-NMSL V2.0(1).bat, CXK-NMSL V2.0.bat, 1.bat, CXK-NMSL V3.1.bat, CXK-NMSL V3.2.bat, nyaa.bat, CXK-NMSL_V3.2.bat, xls.exe, 6985-f94d84da27bd095fdeaf08ed4f7d8c9a.zip

External Pages

Ransomware often links to external pages such as payment pages, telegram contacts, etc. Below are some of the URLs Elastio has found to be associated with CXK-NMSL.

External Pages
  • https://www.bilibili.com/blackboard/help.html
  • https://www.bilibili.com
  • https://space.bilibili.com
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