Type
File Name
Location
Cloak was first discovered in March 2025 in enterprise cloud environments.
Name
Cloak
First Seen
March 2025
Cloak is known to target specific file types. Below are all known file types that Cloak is known to infect.
In some cases, ransomware will update the modified date, when it encrypts files. Cloak updates the last modified date of the file it targets.
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 Cloak ransomware is known to change.
Suffixes
.crYpt
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 Cloak.
Type File Name Location file readme_for_unlock.txt EveryFolder
These are the names of the executables that contain the undetonated ransomware payload for Cloak.
Executables
A3R6C9.exe, ProgramData_A3R6C9.exe.infected
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 Cloak.
External Pages
