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Worm:Win32/Rethed.B


First posted on 05 December 2014.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/Rethed.B.

Explanation :

Threat behavior

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

  • %APPDATA%\microsoft\svchost.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: "Microsoft Windows Update"
With data: "%APPDATA%\microsoft\svchost.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:
  • revmeab.ru using port 80
Malware can connect to a remote host to:
  • 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

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

  • EtherMainD


This can be 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 adc8cabe02b589a87834bf2267e1728af7098ed5. Symptoms

The following can indicate that you have this threat on your PC:

  • You see these files:
    • %APPDATA%\microsoft\svchost.exe
  • You see registry modifications such as:
    • In subkey: HKCU\software\microsoft\windows\currentversion\run
      Sets value: "Microsoft Windows Update"
      With data: "%APPDATA%\microsoft\svchost.exe"
  • You see a mutex such as:
    • EtherMainD

Last update 05 December 2014

 

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