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Worm:MSIL/Baryumka!rfn

First posted on 08 June 2016.
Source: Microsoft

Aliases :

There are no other names known for Worm:MSIL/Baryumka!rfn.

Explanation :

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

• %APPDATA%\c1ajx8yv51.exe
• %USERPROFILE%\documents\er.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: "7M"
With data: "%USERPROFILE%\documents\er.exe"
Sets value: "Sj"
With data: "%APPDATA%\c1ajx8yv51.exe"

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Connects to a remote host

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

• kayumbaforthelasttime.net using port 80
• qwertyuiopqwertyuiop.net using port 80
• kayumbaambackagain.us.to using port 80
• asdfghjklasdfghjk.info using port 80
• kayumbaamback.us.to using port 80
• kayumba.us.to using port 80
• facebook.com using port 80

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:

• jmc

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 4ff9a34f6a71d8167b79949fcb10b0f59b9d6f83.

Last update 08 June 2016

 

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