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Worm:Win32/Nuqel.TB

First posted on 27 March 2015.
Source: Microsoft

Aliases :

There are no other names known for Worm:Win32/Nuqel.TB.

Explanation :

Threat behavior

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

• %SystemRoot%\system3_.exe
• \system3_.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: "Yahoo Messengger"
  With data: "\system3_.exe"
• In subkey: HKLM\software\microsoft\windows nt\currentversion\winlogon
  Sets value: "Shell"
  With data: "explorer.exe system3_.exe"

It creates a schedule to automatically run files on your PC. This can include:

• \system3_.exe

Payload
Changes web browser settings


It can change your Internet Explorer start page by modifying the following registry entry:

In subkey: HKCU\software\microsoft\internet explorer\main
Sets value: "Start Page"
With data: "http://www.mydreamworld.50webs.com"

Modifies system settings

This threat can make changes to the way your PC behaves. It can:

• Disable Task Manager
• Restrict File Explorer settings changes

Connects to a remote host

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

• www.balu001.0catch.com using port 80
• www.balu000.0catch.com using port 80
• www.balu002.0catch.com using port 80
• h1.ripway.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

We have seen this threat access online content, including:

• setting.ini

This malware description was published using automated analysis of file SHA1 2f723542685feeee14ad624140ffe4adc12bb6da.

Symptoms

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

• You see a file similar to:
  • %SystemRoot%\system3_.exe
  • \system3_.exe

• You see registry modifications such as:
  
  • In subkey: HKCU\software\microsoft\internet explorer\main
    Sets value: "Start Page"
    With data: "http://www.mydreamworld.50webs.com"
    
    
  • In subkey: HKCU\software\microsoft\windows\currentversion\policies\explorer
    Sets value: "NofolderOptions"
    With data: "1"
    
    
  • In subkey: HKCU\software\microsoft\windows\currentversion\policies\system
    Sets value: "DisableTaskMgr"
    With data: "1"
    
    
  • In subkey: HKCU\software\microsoft\windows\currentversion\run
    Sets value: "Yahoo Messengger"
    With data: "\system3_.exe"
    
    
  • In subkey: HKLM\software\microsoft\windows nt\currentversion\winlogon
    Sets value: "Shell"
    With data: "explorer.exe system3_.exe"
    
    

Last update 27 March 2015

 

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