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Ransom:Win32/Cryproto.A


First posted on 25 January 2016.
Source: Microsoft

Aliases :

There are no other names known for Ransom:Win32/Cryproto.A.

Explanation :

Installation
This threat can create files on your PC, including:

  • %ProgramFiles%\adobe\adobe help viewer\1.0\ahv.exe
  • %TEMP%\lixclhbp.exe
  • \guppmlcp.lnk


It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Sets value: "gUPpMLCP"
With data: "%TEMP%\lixclhbp.exe"


Payload


Encrypts files

This ransomware encrypts files and appends the extension name "!______sufnex331@gmail.com______.crypt"

Other variants are known to append the following extension names:

  • .-.directorat1c@gmail.com.roto
  • !__crypthelp12@gmail.com_.crypt
  • !______bigromintol971@gmail.com______.crypt


The general format is usually "!________.crypt or _____.roto".

Note: This ransomware can be a destructive malware since it can encrypt system files, and for that reason, can render the system unbootable on the next system startup.

Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

  • {0B0322DA-7CAE-ED48-5FE2-C07DC3D4A330}
  • {C20CD437-BA6D-4ebb-B190-70B43DE3B0F3}


It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.



This malware description was published using automated analysis of file SHA1 f67294cbcc916ccff618d0501169a50ad4465870.

Last update 25 January 2016

 

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