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Ransom:Win32/Shieldcrypt.A

First posted on 31 August 2017.
Source: Microsoft

Aliases :

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

Explanation :

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

• %ProgramData%\microsofttmp\system32\conhost.exe

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: "Indesing Microsoft Updater"
With data: """
Sets value: "Indesing Microsoft"
With data: ""%ProgramData%\microsofttmp\system32\conhost.exe""

Payload

Connects to a remote host

We have seen this threat connect to a remote host, including:

• a.config.skype.com using port 53
• b.config.skype.com using port 53

Malware can connect to a remote host to do any of the following:

• Check for an Internet connection
• Download and run files (including updates or other malware)
• Report a new infection to its author
• Receive configuration or other data
• Receive instructions from a malicious hacker
• Search for your PC location
• Upload information taken from your PC
• Validate a digital certificate

Additional information

Creates a mutex

This threat can create a mutex on your PC. For example:

• C6F26321B8574F95

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 293264a77bf83a1e69d3b38428b4c76f0d54780f.

Last update 31 August 2017

 

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